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Fujita H, Yoshida S, Suzuki K, Toju H. Soil prokaryotic and fungal biome structures associated with crop disease status across the Japan Archipelago. mSphere 2024; 9:e0080323. [PMID: 38567970 PMCID: PMC11036807 DOI: 10.1128/msphere.00803-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 02/29/2024] [Indexed: 04/24/2024] Open
Abstract
Archaea, bacteria, and fungi in the soil are increasingly recognized as determinants of agricultural productivity and sustainability. A crucial step for exploring soil microbiomes with important ecosystem functions is to perform statistical analyses on the potential relationship between microbiome structure and functions based on comparisons of hundreds or thousands of environmental samples collected across broad geographic ranges. In this study, we integrated agricultural field metadata with microbial community analyses by targeting 2,903 bulk soil samples collected along a latitudinal gradient from cool-temperate to subtropical regions in Japan (26.1-42.8 °N). The data involving 632 archaeal, 26,868 bacterial, and 4,889 fungal operational taxonomic units detected across the fields of 19 crop plant species allowed us to conduct statistical analyses (permutational analyses of variance, generalized linear mixed models, randomization analyses, and network analyses) on the relationship among edaphic factors, microbiome compositions, and crop disease prevalence. We then examined whether the diverse microbes form species sets varying in potential ecological impacts on crop plants. A network analysis suggested that the observed prokaryotes and fungi were classified into several species sets (network modules), which differed substantially in association with crop disease prevalence. Within the network of microbe-to-microbe coexistence, ecologically diverse microbes, such as an ammonium-oxidizing archaeon, an antibiotics-producing bacterium, and a potentially mycoparasitic fungus, were inferred to play key roles in shifts between crop-disease-promotive and crop-disease-suppressive states of soil microbiomes. The bird's-eye view of soil microbiome structure will provide a basis for designing and managing agroecosystems with high disease-suppressive functions.IMPORTANCEUnderstanding how microbiome structure and functions are organized in soil ecosystems is one of the major challenges in both basic ecology and applied microbiology. Given the ongoing worldwide degradation of agroecosystems, building frameworks for exploring structural diversity and functional profiles of soil microbiomes is an essential task. Our study provides an overview of cropland microbiome states in light of potential crop-disease-suppressive functions. The large data set allowed us to explore highly functional species sets that may be stably managed in agroecosystems. Furthermore, an analysis of network architecture highlighted species that are potentially used to cause shifts from disease-prevalent states of agroecosystems to disease-suppressive states. By extending the approach of comparative analyses toward broader geographic ranges and diverse agricultural practices, agroecosystem with maximized biological functions will be further explored.
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Affiliation(s)
- Hiroaki Fujita
- Center for Ecological Research, Kyoto University, Otsu, Shiga, Japan
| | - Shigenobu Yoshida
- Institute for Plant Protection, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan
| | - Kenta Suzuki
- Integrated Bioresource Information Division, BioResource Research Center, Tsukuba, Ibaraki, Japan
| | - Hirokazu Toju
- Center for Ecological Research, Kyoto University, Otsu, Shiga, Japan
- Center for Living Systems Information Science (CeLiSIS), Graduate School of Biostudies, Kyoto University, Kyoto, Japan
- Laboratory of Ecosystems and Coevolution, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
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2
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Michimori Y, Yokooji Y, Atomi H. An energy-conserving reaction in amino acid metabolism catalyzed by arginine synthetase. Proc Natl Acad Sci U S A 2024; 121:e2401313121. [PMID: 38602916 PMCID: PMC11032458 DOI: 10.1073/pnas.2401313121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Accepted: 02/28/2024] [Indexed: 04/13/2024] Open
Abstract
All forms of life are presumed to synthesize arginine from citrulline via a two-step pathway consisting of argininosuccinate synthetase and argininosuccinate lyase using citrulline, adenosine 5'-triphosphate (ATP), and aspartate as substrates. Conversion of arginine to citrulline predominantly proceeds via hydrolysis. Here, from the hyperthermophilic archaeon Thermococcus kodakarensis, we identified an enzyme which we designate "arginine synthetase". In arginine synthesis, the enzyme converts citrulline, ATP, and free ammonia to arginine, adenosine 5'-diphosphate (ADP), and phosphate. In the reverse direction, arginine synthetase conserves the energy of arginine deimination and generates ATP from ADP and phosphate while releasing ammonia. The equilibrium constant of this reaction at pH 7.0 is [Cit][ATP][NH3]/[Arg][ADP][Pi] = 10.1 ± 0.7 at 80 °C, corresponding to a ΔG°' of -6.8 ± 0.2 kJ mol-1. Growth of the gene disruption strain was compared to the host strain in medium composed of amino acids. The results suggested that arginine synthetase is necessary in providing ornithine, the precursor for proline biosynthesis, as well as in generating ATP. Growth in medium supplemented with citrulline indicated that arginine synthetase can function in the direction of arginine synthesis. The enzyme is widespread in nature, including bacteria and eukaryotes, and catalyzes a long-overlooked energy-conserving reaction in microbial amino acid metabolism. Along with ornithine transcarbamoylase and carbamate kinase, the pathway identified here is designated the arginine synthetase pathway.
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Affiliation(s)
- Yuta Michimori
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Top Global University Program, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Yuusuke Yokooji
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Haruyuki Atomi
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Top Global University Program, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Integrated Research Center for Carbon Negative Science, Institute of Advanced Energy, Kyoto University, Uji611-0011, Japan
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3
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Michimori Y, Izaki R, Su Y, Fukuyama Y, Shimamura S, Nishimura K, Miwa Y, Hamakita S, Shimosaka T, Makino Y, Takeno R, Sato T, Beppu H, Cann I, Kanai T, Nunoura T, Atomi H. Removal of phosphoglycolate in hyperthermophilic archaea. Proc Natl Acad Sci U S A 2024; 121:e2311390121. [PMID: 38593075 PMCID: PMC11032457 DOI: 10.1073/pnas.2311390121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 03/14/2024] [Indexed: 04/11/2024] Open
Abstract
Many organisms that utilize the Calvin-Benson-Bassham (CBB) cycle for autotrophic growth harbor metabolic pathways to remove and/or salvage 2-phosphoglycolate, the product of the oxygenase activity of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco). It has been presumed that the occurrence of 2-phosphoglycolate salvage is linked to the CBB cycle, and in particular, the C2 pathway to the CBB cycle and oxygenic photosynthesis. Here, we examined 2-phosphoglycolate salvage in the hyperthermophilic archaeon Thermococcus kodakarensis, an obligate anaerobe that harbors a Rubisco that functions in the pentose bisphosphate pathway. T. kodakarensis harbors enzymes that have the potential to convert 2-phosphoglycolate to glycine and serine, and their genes were identified by biochemical and/or genetic analyses. 2-phosphoglycolate phosphatase activity increased 1.6-fold when cells were grown under microaerobic conditions compared to anaerobic conditions. Among two candidates, TK1734 encoded a phosphatase specific for 2-phosphoglycolate, and the enzyme was responsible for 80% of the 2-phosphoglycolate phosphatase activity in T. kodakarensis cells. The TK1734 disruption strain displayed growth impairment under microaerobic conditions, which was relieved upon addition of sodium sulfide. In addition, glycolate was detected in the medium when T. kodakarensis was grown under microaerobic conditions. The results suggest that T. kodakarensis removes 2-phosphoglycolate via a phosphatase reaction followed by secretion of glycolate to the medium. As the Rubisco in T. kodakarensis functions in the pentose bisphosphate pathway and not in the CBB cycle, mechanisms to remove 2-phosphoglycolate in this archaeon emerged independent of the CBB cycle.
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Affiliation(s)
- Yuta Michimori
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Top Global University Program, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Rikihisa Izaki
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Yu Su
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Yuto Fukuyama
- Research Center for Bioscience and Nanoscience, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka237–0061, Japan
| | - Shigeru Shimamura
- Super-Cutting-Edge Grand and Advanced Research (SUGAR) Program, Japan Agency for Marine-Earth Science and Technology, Yokosuka237–0061, Japan
| | - Karin Nishimura
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Yuya Miwa
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Sotaro Hamakita
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Takahiro Shimosaka
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Top Global University Program, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Yuki Makino
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Ryo Takeno
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Takaaki Sato
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Integrated Research Center for Carbon Negative Science, Institute of Advanced Energy, Kyoto University, Uji611-0011, Japan
| | - Haruki Beppu
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Isaac Cann
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Top Global University Program, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Department of Animal Science, University of Illinois Urbana-Champaign, Urbana, IL61801
| | - Tamotsu Kanai
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
| | - Takuro Nunoura
- Research Center for Bioscience and Nanoscience, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka237–0061, Japan
| | - Haruyuki Atomi
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Top Global University Program, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto615-8510, Japan
- Integrated Research Center for Carbon Negative Science, Institute of Advanced Energy, Kyoto University, Uji611-0011, Japan
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4
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Otsuka H, Urita K, Honma N, Kimuro T, Amako Y, Kukobat R, Bandosz TJ, Ukai J, Moriguchi I, Kaneko K. Transient chemical and structural changes in graphene oxide during ripening. Nat Commun 2024; 15:1708. [PMID: 38402244 PMCID: PMC10894275 DOI: 10.1038/s41467-024-46083-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 02/13/2024] [Indexed: 02/26/2024] Open
Abstract
Graphene oxide (GO)-the oxidized form of graphene-is actively studied in various fields, such as energy, electronic devices, separation of water, materials engineering, and medical technologies, owing to its fascinating physicochemical properties. One major drawback of GO is its instability, which leads to the difficulties in product management. A physicochemical understanding of the ever-changing nature of GO can remove the barrier for its growing applications. Here, we evidencde the presence of intrinsic, metastable and transient GO states upon ripening. The three GO states are identified using a [Formula: see text] transition peak of ultraviolet-visible absorption spectra and exhibit inherent magnetic and electrical properties. The presence of three states of GO is supported by the compositional changes of oxygen functional groups detected via X-ray photoelectron spectroscopy and structural information from X-ray diffraction analysis and transmission electron microscopy. Although intrinsic GO having a [Formula: see text] transition at 230.5 ± 0.5 nm is stable only for 5 days at 298 K, the intrinsic state can be stabilized by either storing GO dispersions below 255 K or by adding ammonium peroxydisulfate.
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Affiliation(s)
- Hayato Otsuka
- Research Initiative for Supra-Materials, Shinshu University, 4-17-1 Wakasato, Nagano, Nagano, 380-8553, Japan
| | - Koki Urita
- Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, Nagasaki, 852-8521, Japan
| | - Nobutaka Honma
- New Material & Value Creation Gr., Project Material Creation Dept., Mobility Material Engineering Div., Toyota Motor Corporation, 1, Toyota-cho, Toyota, Aichi, 471-8572, Japan
| | - Takashi Kimuro
- Development Gr.2, Development Section, Engineering Dept., Sanwayuka Industry Corporation, Fukada 15, Ichiriyamacho, Kariya, Aichi, 448-0002, Japan
| | - Yasushi Amako
- Department of Physics, Faculty of Science, Shinshu University, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Radovan Kukobat
- Research Initiative for Supra-Materials, Shinshu University, 4-17-1 Wakasato, Nagano, Nagano, 380-8553, Japan
- Department of Chemical Engineering and Technology, Faculty of Technology, University of Banja Luka, B.V. Stepe Stepanovica 73, 78 000, Banja Luka, Bosnia and Herzegovina
| | - Teresa J Bandosz
- Department of Chemistry and Biochemistry, The City College of New York, 160 Convent Avenue, New York, NY, 10031, USA
| | - Junzo Ukai
- New Material & Value Creation Gr., Project Material Creation Dept., Mobility Material Engineering Div., Toyota Motor Corporation, 1, Toyota-cho, Toyota, Aichi, 471-8572, Japan
| | - Isamu Moriguchi
- Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, Nagasaki, 852-8521, Japan
| | - Katsumi Kaneko
- Research Initiative for Supra-Materials, Shinshu University, 4-17-1 Wakasato, Nagano, Nagano, 380-8553, Japan.
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5
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Tanaka R, Miyake H, Shibata T. Genome sequence of Vibrio sp. strain 10N, an ulvan-degrading bacterium isolated from coastal seawater collected at Ise Bay, Japan. Microbiol Resour Announc 2024; 13:e0097223. [PMID: 38206020 PMCID: PMC10868263 DOI: 10.1128/mra.00972-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 12/19/2023] [Indexed: 01/12/2024] Open
Abstract
Genome sequence of an ulvan-degrading bacterium, Vibrio sp. strain 10N, is presented. The genome is 5,358,550 bp with a G + C content of 46.5%. A total of 4,712 coding sequences, including two novel ulvan lyase genes encoding a BNR4 and a glycoside hydrolase (GH88) motif, are known to be involved in the degradation of green algae.
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Affiliation(s)
- Reiji Tanaka
- Graduate School of Bioresource, Mie University, Tsu, Japan
- Seaweed Biorefinery Research Center, Mie University, Tsu, Japan
| | - Hideo Miyake
- Graduate School of Bioresource, Mie University, Tsu, Japan
- Seaweed Biorefinery Research Center, Mie University, Tsu, Japan
| | - Toshiyuki Shibata
- Graduate School of Bioresource, Mie University, Tsu, Japan
- Seaweed Biorefinery Research Center, Mie University, Tsu, Japan
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6
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Hoshi N, Nakamura M, Kubo R, Suzuki R. Enhanced oxygen reduction reaction on caffeine-modified platinum single-crystal electrodes. Commun Chem 2024; 7:23. [PMID: 38310168 PMCID: PMC10838267 DOI: 10.1038/s42004-024-01113-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 01/23/2024] [Indexed: 02/05/2024] Open
Abstract
Enhancing the activity of the oxygen reduction reaction (ORR) is crucial for fuel cell development, and hydrophobic species are known to increase the ORR activity. This paper reports that caffeine enhanced the specific ORR activity of Pt(111) 11-fold compared to that without caffeine in a 0.1 M HClO4 aqueous solution. Moreover, caffeine increased the ORR activity of Pt(110) 2.5-fold; however, the activity of Pt(100) was unaffected. The infrared (IR) band of PtOH (blocking species of the ORR) decreased for all the surfaces. Caffeine was adsorbed with its molecular plane perpendicular to the Pt(111) and Pt(110) surfaces and tilted relative to the Pt(100) surface. Thus, the effects of caffeine on the ORR activity can be rationalized by a decrease in PtOH coverage and the difference in adsorption geometry of caffeine.
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Affiliation(s)
- Nagahiro Hoshi
- Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, 1-33 Yayoi-cho Inage-ku, Chiba, 263-8522, Japan.
| | - Masashi Nakamura
- Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, 1-33 Yayoi-cho Inage-ku, Chiba, 263-8522, Japan
| | - Ryuta Kubo
- Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, 1-33 Yayoi-cho Inage-ku, Chiba, 263-8522, Japan
| | - Rui Suzuki
- Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, 1-33 Yayoi-cho Inage-ku, Chiba, 263-8522, Japan
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7
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Khadka DB, Shirai Y, Yanagida M, Ota H, Lyalin A, Taketsugu T, Miyano K. Defect passivation in methylammonium/bromine free inverted perovskite solar cells using charge-modulated molecular bonding. Nat Commun 2024; 15:882. [PMID: 38287031 PMCID: PMC10824754 DOI: 10.1038/s41467-024-45228-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 01/17/2024] [Indexed: 01/31/2024] Open
Abstract
Molecular passivation is a prominent approach for improving the performance and operation stability of halide perovskite solar cells (HPSCs). Herein, we reveal discernible effects of diammonium molecules with either an aryl or alkyl core onto Methylammonium-free perovskites. Piperazine dihydriodide (PZDI), characterized by an alkyl core-electron cloud-rich-NH terminal, proves effective in mitigating surface and bulk defects and modifying surface chemistry or interfacial energy band, ultimately leading to improved carrier extraction. Benefiting from superior PZDI passivation, the device achieves an impressive efficiency of 23.17% (area ~1 cm2) (low open circuit voltage deficit ~0.327 V) along with superior operational stability. We achieve a certified efficiency of ~21.47% (area ~1.024 cm2) for inverted HPSC. PZDI strengthens adhesion to the perovskite via -NH2I and Mulliken charge distribution. Device analysis corroborates that stronger bonding interaction attenuates the defect densities and suppresses ion migration. This work underscores the crucial role of bifunctional molecules with stronger surface adsorption in defect mitigation, setting the stage for the design of charge-regulated molecular passivation to enhance the performance and stability of HPSC.
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Affiliation(s)
- Dhruba B Khadka
- Photovoltaic Materials Group, Center for GREEN Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
| | - Yasuhiro Shirai
- Photovoltaic Materials Group, Center for GREEN Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
| | - Masatoshi Yanagida
- Photovoltaic Materials Group, Center for GREEN Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Hitoshi Ota
- Battery Research Platform, Research Center for Energy and Environmental Materials (GREEN), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, 305-0044, Japan
| | - Andrey Lyalin
- Research Center for Energy and Environmental Materials (GREEN), National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Japan.
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, 001-0021, Japan.
| | - Tetsuya Taketsugu
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, 001-0021, Japan
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Kenjiro Miyano
- Photovoltaic Materials Group, Center for GREEN Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
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Omura T, Isobe N, Miura T, Ishii S, Mori M, Ishitani Y, Kimura S, Hidaka K, Komiyama K, Suzuki M, Kasuya KI, Nomaki H, Nakajima R, Tsuchiya M, Kawagucci S, Mori H, Nakayama A, Kunioka M, Kamino K, Iwata T. Microbial decomposition of biodegradable plastics on the deep-sea floor. Nat Commun 2024; 15:568. [PMID: 38278791 PMCID: PMC10817984 DOI: 10.1038/s41467-023-44368-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 12/11/2023] [Indexed: 01/28/2024] Open
Abstract
Microbes can decompose biodegradable plastics on land, rivers and seashore. However, it is unclear whether deep-sea microbes can degrade biodegradable plastics in the extreme environmental conditions of the seafloor. Here, we report microbial decomposition of representative biodegradable plastics (polyhydroxyalkanoates, biodegradable polyesters, and polysaccharide esters) at diverse deep-sea floor locations ranging in depth from 757 to 5552 m. The degradation of samples was evaluated in terms of weight loss, reduction in material thickness, and surface morphological changes. Poly(L-lactic acid) did not degrade at either shore or deep-sea sites, while other biodegradable polyesters, polyhydroxyalkanoates, and polysaccharide esters were degraded. The rate of degradation slowed with water depth. We analysed the plastic-associated microbial communities by 16S rRNA gene amplicon sequencing and metagenomics. Several dominant microorganisms carried genes potentially encoding plastic-degrading enzymes such as polyhydroxyalkanoate depolymerases and cutinases/polyesterases. Analysis of available metagenomic datasets indicated that these microorganisms are present in other deep-sea locations. Our results confirm that biodegradable plastics can be degraded by the action of microorganisms on the deep-sea floor, although with much less efficiency than in coastal settings.
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Affiliation(s)
- Taku Omura
- Laboratory of Science of Polymeric Materials, Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Noriyuki Isobe
- Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
| | - Takamasa Miura
- Biological Resource Center, National Institute of Technology and Evaluation (NBRC), 2-5-8 Kazusakamatari, Kisarazu, Chiba, 292-0818, Japan
| | - Shun'ichi Ishii
- Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-STAR), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
| | - Mihoko Mori
- Biological Resource Center, National Institute of Technology and Evaluation (NBRC), 2-5-8 Kazusakamatari, Kisarazu, Chiba, 292-0818, Japan
| | - Yoshiyuki Ishitani
- Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-STAR), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
| | - Satoshi Kimura
- Laboratory of Science of Polymeric Materials, Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Kohei Hidaka
- Biological Resource Center, National Institute of Technology and Evaluation (NBRC), 2-5-8 Kazusakamatari, Kisarazu, Chiba, 292-0818, Japan
| | - Katsuya Komiyama
- Laboratory of Science of Polymeric Materials, Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Miwa Suzuki
- Gunma University Center for Food Science and Wellness (GUCFW), Maebashi, Gunma, 371-8510, Japan
| | - Ken-Ichi Kasuya
- Gunma University Center for Food Science and Wellness (GUCFW), Maebashi, Gunma, 371-8510, Japan
- Green Polymer Research Laboratory, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma, 376-8515, Japan
| | - Hidetaka Nomaki
- Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-STAR), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
| | - Ryota Nakajima
- Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
| | - Masashi Tsuchiya
- Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
| | - Shinsuke Kawagucci
- Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
| | - Hiroyuki Mori
- Japan BioPlastics Association (JBPA), 5-11 Nihonbashi Hakozaki-cho, Chuo-ku, Tokyo, 103-0015, Japan
| | - Atsuyoshi Nakayama
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka, 563-8577, Japan
| | - Masao Kunioka
- Standardization Promotion Office, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8560, Japan
| | - Kei Kamino
- Biological Resource Center, National Institute of Technology and Evaluation (NBRC), 2-5-8 Kazusakamatari, Kisarazu, Chiba, 292-0818, Japan
| | - Tadahisa Iwata
- Laboratory of Science of Polymeric Materials, Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan.
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9
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Yoshida R, Mizuta Y, Kato T, Kimura T. Comparison of large-volume 3D reconstruction using plasma FIB-SEM and X-ray CT. Microscopy (Oxf) 2024:dfae003. [PMID: 38244611 DOI: 10.1093/jmicro/dfae003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Revised: 12/26/2023] [Accepted: 01/12/2024] [Indexed: 01/22/2024] Open
Abstract
We demonstrated large-volume three-dimensional (3D) reconstruction using plasma focused ion beam - scanning electron microscopy (PFIB-SEM). We successfully reconstructed a 750 μm (W) × 143 μm (H) × 310 μm (D) volume at a resolution of 200 nm/pix from 1,550 SEM backscattered electron images of a Li-ion battery cathode sheet. The PFIB-SEM system was found to be capable of acquiring and reconstructing larger volume 3D datasets than X-ray computed tomography, and with higher resolution and contrast.
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Affiliation(s)
- Ryuji Yoshida
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta-ku, Nagoya, Japan
| | - Yasutoshi Mizuta
- Materials R&D Laboratory, Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta-ku, Nagoya, Japan
| | - Takeharu Kato
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta-ku, Nagoya, Japan
| | - Teiichi Kimura
- Materials R&D Laboratory, Japan Fine Ceramics Center, 2-4-1, Mutsuno, Atsuta-ku, Nagoya, Japan
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10
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Sun M, Cheng J, Yamauchi M. Gas diffusion enhanced electrode with ultrathin superhydrophobic macropore structure for acidic CO 2 electroreduction. Nat Commun 2024; 15:491. [PMID: 38225248 PMCID: PMC10789815 DOI: 10.1038/s41467-024-44722-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 01/02/2024] [Indexed: 01/17/2024] Open
Abstract
Carbon dioxide (CO2) electroreduction reaction (CO2RR) offers a promising strategy for the conversion of CO2 into valuable chemicals and fuels. CO2RR in acidic electrolytes would have various advantages due to the suppression of carbonate formation. However, its reaction rate is severely limited by the slow CO2 diffusion due to the absence of hydroxide that facilitates the CO2 diffusion in an acidic environment. Here, we design an optimal architecture of a gas diffusion electrode (GDE) employing a copper-based ultrathin superhydrophobic macroporous layer, in which the CO2 diffusion is highly enhanced. This GDE retains its applicability even under mechanical deformation conditions. The CO2RR in acidic electrolytes exhibits a Faradaic efficiency of 87% with a partial current density [Formula: see text] of -1.6 A cm-2 for multicarbon products (C2+), and [Formula: see text] of -0.34 A cm-2 when applying dilute 25% CO2. In a highly acidic environment, C2+ formation occurs via a second order reaction which is controlled by both the catalyst and its hydroxide.
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Affiliation(s)
- Mingxu Sun
- Department of Chemistry, Graduate School of Science, Kyushu University, Nishi-ku, Fukuoka, Japan
| | - Jiamin Cheng
- Research Center for Negative Emissions Technologies (K-NETs), Kyushu University, Nishi-ku, Fukuoka, Japan
| | - Miho Yamauchi
- Department of Chemistry, Graduate School of Science, Kyushu University, Nishi-ku, Fukuoka, Japan.
- Research Center for Negative Emissions Technologies (K-NETs), Kyushu University, Nishi-ku, Fukuoka, Japan.
- Institute for Materials Chemistry and Engineering (IMCE), Kyushu University, Nishi-ku, Fukuoka, Japan.
- International Institute for Carbon-Neutral Energy Research (WPI-I²CNER), Kyushu University, Nishi-ku, Fukuoka, Japan.
- Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Aoba-ku, Sendai, Japan.
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11
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Ueoka R, Hara Y, Maeno A, Kaji H, Nakanishi K, Kanamori K. Unusual flexibility of transparent poly(methylsilsesquioxane) aerogels by surfactant-induced mesoscopic fiber-like assembly. Nat Commun 2024; 15:461. [PMID: 38212598 PMCID: PMC10784555 DOI: 10.1038/s41467-024-44713-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 01/02/2024] [Indexed: 01/13/2024] Open
Abstract
High-performance thermal insulators represented by aerogels are regarded as one of the most promising materials for energy savings. However, significantly low mechanical strength has been a barrier for aerogels to be utilized in various social domains such as houses, buildings, and industrial plants. Here, we report a synthetic strategy to realize highly transparent aerogels with unusually high bending flexibility based on poly(methylsilsesquioxane) (PMSQ) network. We have constructed mesoscopic fine fiber-like structures of various sizes in PMSQ gels by the combination of phase separation suppression by tetramethylammonium hydroxide (TMAOH) and mesoscopic fiber-like assembly by nonionic poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) (PEO-b-PPO-b-PEO) type surfactant. The optimized mesoscale structures of PMSQ gels have realized highly transparent and resilient monolithic aerogels with much high bendability compared to those reported in previous works. This work will provide a way to highly insulating materials with glasslike transparency and high mechanical flexibility.
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Affiliation(s)
- Ryota Ueoka
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yosuke Hara
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Ayaka Maeno
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
| | - Hironori Kaji
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
| | - Kazuki Nakanishi
- Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan
- Institute for Integrated Cell-Material Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Kazuyoshi Kanamori
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan.
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12
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Guo Y, Tsuda K, Hosseini S, Murakami Y, Tricoli A, Coventry J, Lipiński W, Torres JF. Scalable nano-architecture for stable near-blackbody solar absorption at high temperatures. Nat Commun 2024; 15:384. [PMID: 38195671 PMCID: PMC10776863 DOI: 10.1038/s41467-023-44672-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 12/13/2023] [Indexed: 01/11/2024] Open
Abstract
Light trapping enhancement by nanostructures is ubiquitous in engineering applications, for example, in improving highly-efficient concentrating solar thermal (CST) technologies. However, most nano-engineered coatings and metasurfaces are not scalable to large surfaces ( > 100 m2) and are unstable at elevated temperatures ( > 850 °C), hindering their wide-spread adoption in CST. Here, we propose a scalable layer nano-architecture that can significantly enhance the solar absorption of an arbitrary material. Our electromagnetics modelling predicts that the absorptance of cutting-edge light-absorbers can be further enhanced by more than 70%, i.e. relative improvement towards blackbody absorption from a baseline value without the nano-architecture. Experimentally, the nano-architecture yields a solar absorber that is 35% optically closer to a blackbody, even after long-term (1000 h) high-temperature (900 °C) ageing in air. A stable solar absorptance of more than 97.88 ± 0.14% is achieved, to the best of our knowledge, the highest so far reported for these extreme ageing conditions. The scalability of the layer nano-architecture is further demonstrated with a drone-assisted deposition, paving the way towards a simple yet significant solar absorptance boosting and maintenance method for existing and newly developed CST absorbing materials.
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Affiliation(s)
- Yifan Guo
- ANU HEAT Lab, School of Engineering, Australian National University, Canberra, Australia
- Thermal Energy Group, School of Engineering, Australian National University, Canberra, Australia
| | | | - Sahar Hosseini
- ANU HEAT Lab, School of Engineering, Australian National University, Canberra, Australia
- Thermal Energy Group, School of Engineering, Australian National University, Canberra, Australia
| | - Yasushi Murakami
- Faculty of Textile Science and Technology, Shinshu University, Ueda, Japan
| | - Antonio Tricoli
- Nanotechnology Research Laboratory, Faculty of Engineering, University of Sydney, Sydney, Australia
- Nanotechnology Research Laboratory, Research School of Chemistry, Australian National University, Canberra, Australia
| | - Joe Coventry
- Thermal Energy Group, School of Engineering, Australian National University, Canberra, Australia
| | | | - Juan F Torres
- ANU HEAT Lab, School of Engineering, Australian National University, Canberra, Australia.
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13
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Lin L, Ma Y, Vequizo JJM, Nakabayashi M, Gu C, Tao X, Yoshida H, Pihosh Y, Nishina Y, Yamakata A, Shibata N, Hisatomi T, Takata T, Domen K. Efficient and stable visible-light-driven Z-scheme overall water splitting using an oxysulfide H 2 evolution photocatalyst. Nat Commun 2024; 15:397. [PMID: 38195692 PMCID: PMC10776739 DOI: 10.1038/s41467-024-44706-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 01/02/2024] [Indexed: 01/11/2024] Open
Abstract
So-called Z-scheme systems permit overall water splitting using narrow-bandgap photocatalysts. To boost the performance of such systems, it is necessary to enhance the intrinsic activities of the hydrogen evolution photocatalyst and oxygen evolution photocatalyst, promote electron transfer from the oxygen evolution photocatalyst to the hydrogen evolution photocatalyst, and suppress back reactions. The present work develop a high-performance oxysulfide photocatalyst, Sm2Ti2O5S2, as an hydrogen evolution photocatalyst for use in a Z-scheme overall water splitting system in combination with BiVO4 as the oxygen evolution photocatalyst and reduced graphene oxide as the solid-state electron mediator. After surface modifications of the photocatalysts to promote charge separation and redox reactions, this system is able to split water into hydrogen and oxygen for more than 100 hours with a solar-to-hydrogen energy conversion efficiency of 0.22%. In contrast to many existing photocatalytic systems, the water splitting activity of the present system is only minimally reduced by increasing the background pressure to 90 kPa. These results suggest characteristics suitable for applications under practical operating conditions.
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Affiliation(s)
- Lihua Lin
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Yiwen Ma
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Junie Jhon M Vequizo
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Mamiko Nakabayashi
- Institute for Engineering Innovation, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Chen Gu
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Xiaoping Tao
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Hiroaki Yoshida
- Science and Innovation Center, Mitsubishi Chemical Corporation, Aoba-ku, Yokohama-shi, Kanagawa, Japan
- Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), Tokyo, Japan
| | - Yuriy Pihosh
- Office of University Professors, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Yuta Nishina
- Graduate School of Natural Science and Technology, Okayama University, Kita-ku, Okayama, Japan
| | - Akira Yamakata
- Faculty of Natural Science and Technology, Okayama University, Kita-ku, Okayama, Japan
| | - Naoya Shibata
- Institute for Engineering Innovation, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Takashi Hisatomi
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Tsuyoshi Takata
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan
| | - Kazunari Domen
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano, Japan.
- Office of University Professors, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
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14
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Iyama D, Kamiya T, Fujii S, Mukai H, Zhou Y, Nagase T, Tomonaga A, Wang R, Xue JJ, Watabe S, Kwon S, Tsai JS. Observation and manipulation of quantum interference in a superconducting Kerr parametric oscillator. Nat Commun 2024; 15:86. [PMID: 38167480 PMCID: PMC10762009 DOI: 10.1038/s41467-023-44496-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 12/15/2023] [Indexed: 01/05/2024] Open
Abstract
Quantum tunneling is the phenomenon that makes superconducting circuits "quantum". Recently, there has been a renewed interest in using quantum tunneling in phase space of a Kerr parametric oscillator as a resource for quantum information processing. Here, we report a direct observation of quantum interference induced by such tunneling and its dynamics in a planar superconducting circuit through Wigner tomography. We experimentally elucidate all essential properties of this quantum interference, such as mapping from Fock states to cat states, a temporal oscillation due to the pump detuning, as well as its characteristic Rabi oscillations and Ramsey fringes. Finally, we perform gate operations as manipulations of the observed quantum interference. Our findings lay the groundwork for further studies on quantum properties of superconducting Kerr parametric oscillators and their use in quantum information technologies.
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Affiliation(s)
- Daisuke Iyama
- Department of Physics, Graduate School of Science, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
| | - Takahiko Kamiya
- Department of Physics, Graduate School of Science, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
| | - Shiori Fujii
- Department of Physics, Graduate School of Science, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
| | - Hiroto Mukai
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
- Research Institute for Science and Technology, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
| | - Yu Zhou
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
| | - Toshiaki Nagase
- Department of Physics, Graduate School of Science, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
| | - Akiyoshi Tomonaga
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
- Research Institute for Science and Technology, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
| | - Rui Wang
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
- Research Institute for Science and Technology, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
| | - Jiao-Jiao Xue
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
- Institute of Theoretical Physics, School of Physics, Xi'an Jiaotong University, Xi'an, People's Republic of China
| | - Shohei Watabe
- College of Engineering, Department of Computer Science and Engineering, Shibaura Institute of Technology, Koto-ku, Tokyo, Japan
| | - Sangil Kwon
- Research Institute for Science and Technology, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan.
| | - Jaw-Shen Tsai
- RIKEN Center for Quantum Computing (RQC), Wako-shi, Saitama, Japan
- Research Institute for Science and Technology, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
- Graduate School of Science, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan
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15
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Akutsu Y, Fujiwara T, Suzuki R, Nishigaya Y, Yamazaki T. Juglone, a plant-derived 1,4-naphthoquinone, binds to hydroxylamine oxidoreductase and inhibits the electron transfer to cytochrome c554. Appl Environ Microbiol 2023; 89:e0129123. [PMID: 38009977 PMCID: PMC10734522 DOI: 10.1128/aem.01291-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 09/20/2023] [Indexed: 11/29/2023] Open
Abstract
IMPORTANCE Nitrification, the microbial conversion of ammonia to nitrate via nitrite, plays a pivotal role in the global nitrogen cycle. However, the excessive use of ammonium-based fertilizers in agriculture has disrupted this cycle, leading to groundwater pollution and greenhouse gas emissions. In this study, we have demonstrated the inhibitory effects of plant-derived juglone and related 1,4-naphthoquinones on the nitrification process in Nitrosomonas europaea. Notably, the inhibition mechanism is elucidated in which 1,4-naphthoquinones interact with hydroxylamine oxidoreductase, disrupting the electron transfer to cytochrome c554, a physiological electron acceptor. These findings support the notion that phytochemicals can impede nitrification by interfering with the essential electron transfer process in ammonia oxidation. The findings presented in this article offer valuable insights for the development of strategies aimed at the management of nitrification, reduction of fertilizer utilization, and mitigation of greenhouse gas emissions.
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Affiliation(s)
- Yukie Akutsu
- Research Center for Advanced Analysis, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, Japan
| | - Takaaki Fujiwara
- Research Center for Advanced Analysis, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, Japan
| | - Rintaro Suzuki
- Research Center for Advanced Analysis, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, Japan
| | | | - Toshimasa Yamazaki
- Research Center for Advanced Analysis, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, Japan
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16
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Miyazaki S, Chen D, Jiacheng B, Toyao T, Kanda Y, Shimizu KI. In Situ Spectroscopic Study of CO 2 Capture and Methanation over Ni-Ca Based Dual Functional Materials. Chem Asian J 2023:e202301003. [PMID: 38116894 DOI: 10.1002/asia.202301003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Revised: 12/14/2023] [Accepted: 12/19/2023] [Indexed: 12/21/2023]
Abstract
Carbon dioxide capture and reduction (CCR) to CH4 using dual-functional materials (DFMs) have recently attracted significant attention as a promising strategy for carbon capture and utilization. In this study, we investigate the mechanism of CCR to CH4 over Al2 O3 -supported Ni-Ca DFMs (Ni-Ca/Al2 O3 ) under cyclic feeds of model combustion exhaust (2.5 % CO2 +0 or 10 % O2 /N2 ) and H2 at 500 °C. Various spectroscopic analyses, including time-resolved in situ X-ray diffraction and X-ray absorption spectroscopy, were conducted during CO2 capture and the subsequent H2 -reduction steps. Based on these analyses, we propose a mechanism of CCR to CH4 over Ni-Ca based DFMs. During the CO2 capture step, the Ni0 species underwent complete oxidation in the presence of O2 to yield NiO. Subsequently, CO2 was captured through the interaction between the CaO surface and CO2 , resulting in the formation of CaCO3 layers on the CaO particles. When the gas flow was switched to H2 , NiO was partially to provide Ni0 sites, which acted as active sites for H2 -reduction of the adjacent CaCO3 layers to yield CaO and gas-phase products, CH4 and H2 O.
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Affiliation(s)
- Shinta Miyazaki
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Duotian Chen
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Bao Jiacheng
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Takashi Toyao
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
| | - Yasuharu Kanda
- Chemical and Biological Engineering Research Unit, Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto, Muroran, Hokkaido, 050-8585, Japan
| | - Ken-Ichi Shimizu
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan
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17
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Xiao J, Nakabayashi M, Hisatomi T, Vequizo JJM, Li W, Chen K, Tao X, Yamakata A, Shibata N, Takata T, Inoue Y, Domen K. Sub-50 nm perovskite-type tantalum-based oxynitride single crystals with enhanced photoactivity for water splitting. Nat Commun 2023; 14:8030. [PMID: 38049410 PMCID: PMC10696056 DOI: 10.1038/s41467-023-43838-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 11/22/2023] [Indexed: 12/06/2023] Open
Abstract
A long-standing trade-off exists between improving crystallinity and minimizing particle size in the synthesis of perovskite-type transition-metal oxynitride photocatalysts via the thermal nitridation of commonly used metal oxide and carbonate precursors. Here, we overcome this limitation to fabricate ATaO2N (A = Sr, Ca, Ba) single nanocrystals with particle sizes of several tens of nanometers, excellent crystallinity and tunable long-wavelength response via thermal nitridation of mixtures of tantalum disulfide, metal hydroxides (A(OH)2), and molten-salt fluxes (e.g., SrCl2) as precursors. The SrTaO2N nanocrystals modified with a tailored Ir-Pt alloy@Cr2O3 cocatalyst evolved H2 around two orders of magnitude more efficiently than the previously reported SrTaO2N photocatalysts, with a record solar-to-hydrogen energy conversion efficiency of 0.15% for SrTaO2N in Z-scheme water splitting. Our findings enable the synthesis of perovskite-type transition-metal oxynitride nanocrystals by thermal nitridation and pave the way for manufacturing advanced long-wavelength-responsive particulate photocatalysts for efficient solar energy conversion.
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Affiliation(s)
- Jiadong Xiao
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, 380-8553, Japan
| | - Mamiko Nakabayashi
- Institute of Engineering Innovation, School of Engineering, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Takashi Hisatomi
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, 380-8553, Japan
| | - Junie Jhon M Vequizo
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, 380-8553, Japan
| | - Wenpeng Li
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, 380-8553, Japan
| | - Kaihong Chen
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, 380-8553, Japan
| | - Xiaoping Tao
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, 380-8553, Japan
| | - Akira Yamakata
- Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama, 700-8530, Japan
| | - Naoya Shibata
- Institute of Engineering Innovation, School of Engineering, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Tsuyoshi Takata
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, 380-8553, Japan
| | - Yasunobu Inoue
- Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Kazunari Domen
- Research Initiative for Supra-Materials, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Nagano-shi, Nagano, 380-8553, Japan.
- Office of University Professors, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-8656, Japan.
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18
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Hachisuka SI, Sakurai T, Mizuno S, Kosuge K, Endo S, Ishii-Hyakutake M, Miyahara Y, Yamazaki M, Tsuge T. Isolation and characterization of polyhydroxyalkanoate-degrading bacteria in seawater at two different depths from Suruga Bay. Appl Environ Microbiol 2023; 89:e0148823. [PMID: 37855636 PMCID: PMC10686062 DOI: 10.1128/aem.01488-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 09/04/2023] [Indexed: 10/20/2023] Open
Abstract
IMPORTANCE Polyhydroxyalkanoate (PHA) is a highly biodegradable microbial polyester, even in marine environments. In this study, we incorporated an enrichment culture-like approach in the process of isolating marine PHA-degrading bacteria. The resulting 91 isolates were suggested to fall into five genera (Alloalcanivorax, Alteromonas, Arenicella, Microbacterium, and Pseudoalteromonas) based on 16S rRNA analysis, including two novel genera (Arenicella and Microbacterium) as marine PHA-degrading bacteria. Microbacterium schleiferi (DSM 20489) and Alteromonas macleodii (NBRC 102226), the type strains closest to the several isolates, have an extracellular poly(3-hydroxybutyrate) [P(3HB)] depolymerase homolog that does not fit a marine-type domain composition. However, A. macleodii exhibited no PHA degradation ability, unlike M. schleiferi. This result demonstrates that the isolated Alteromonas spp. are different species from A. macleodii. P(3HB) depolymerase homologs in the genus Alteromonas should be scrutinized in the future, particularly about which ones work as the depolymerase.
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Affiliation(s)
- Shin-Ichi Hachisuka
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan
| | - Tetsuo Sakurai
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan
| | - Shoji Mizuno
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan
| | - Kazuho Kosuge
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan
| | - Sayaka Endo
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan
| | - Manami Ishii-Hyakutake
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan
| | - Yuki Miyahara
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan
| | - Motoyuki Yamazaki
- Shizuoka Prefectural Research Institute of Fishery and Ocean, Iwashigashima, Yaizu, Shizuoka, Japan
| | - Takeharu Tsuge
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan
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19
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Era K, Sato K, Miyahara SI, Naito T, De Silva K, Akrami S, Yamada H, Toriyama T, Yamamoto T, Murakami Y, Aika KI, Inazu K, Nagaoka K. Catalytic Behavior of K-doped Fe/MgO Catalysts for Ammonia Synthesis Under Mild Reaction Conditions. ChemSusChem 2023; 16:e202300942. [PMID: 37877342 DOI: 10.1002/cssc.202300942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/13/2023] [Accepted: 10/23/2023] [Indexed: 10/26/2023]
Abstract
An important part of realizing a carbon-neutral society using ammonia will be the development of an inexpensive yet efficient catalyst for ammonia synthesis under mild reaction conditions (<400 °C, <10 MPa). Here, we report Fe/K(3)/MgO, fabricated via an impregnation method, as a highly active catalyst for ammonia synthesis under mild reaction conditions (350 °C, 1.0 MPa). At the mentioned conditions, the activity of Fe/K(3)/MgO (17.5 mmol h-1 gcat -1 ) was greater than that of a commercial fused iron catalyst (8.6 mmol h-1 gcat -1 ) currently used in the Haber-Bosch process. K doping was found to increase the ratio of Fe0 on the surface and turnover frequency of Fe in our Fe/K(3)/MgO catalyst. In addition, increasing the pressure to 3.0 MPa at the same temperature led to a significant improvement of the ammonia synthesis rate to 29.6 mmol h-1 gcat -1 , which was higher than that of two more expensive, benchmark Ru-based catalysts, which are also potential alternative catalysts. A kinetics analysis revealed that the addition of K enhanced the ammonia synthesis activity at ≥300 °C by changing the main adsorbed species from NH to N which can accelerate dissociative adsorption of nitrogen as the rate limiting step in ammonia synthesis.
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Affiliation(s)
- Kohei Era
- Department of Chemical Systems Engineering, Graduate school of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Katsutoshi Sato
- Department of Chemical Systems Engineering, Graduate school of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
- Institute for Advanced Research, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Shin-Ichiro Miyahara
- Department of Chemical Systems Engineering, Graduate school of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Takahiro Naito
- Institutes of Innovation for Future Society, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Kanishka De Silva
- Institutes of Innovation for Future Society, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Saeid Akrami
- Institutes of Innovation for Future Society, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Hiroshi Yamada
- Department of Chemical Systems Engineering, Graduate school of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Takaaki Toriyama
- The Ultramicroscopy Research Center, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Tomokazu Yamamoto
- The Ultramicroscopy Research Center, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Yasukazu Murakami
- The Ultramicroscopy Research Center, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Ken-Ichi Aika
- National Institute of Technology, Numazu College, 3600 Ooka, Numazu, Shizuoka, 410-8501, Japan
| | - Koji Inazu
- National Institute of Technology, Numazu College, 3600 Ooka, Numazu, Shizuoka, 410-8501, Japan
| | - Katsutoshi Nagaoka
- Department of Chemical Systems Engineering, Graduate school of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
- Institutes of Innovation for Future Society, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
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20
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Soma Y, Tominaga S, Tokito K, Imado Y, Naka K, Hanai T, Takahashi M, Izumi Y, Bamba T. Trace impurities in sodium phosphate influences the physiological activity of Escherichia coli in M9 minimal medium. Sci Rep 2023; 13:17396. [PMID: 37833342 PMCID: PMC10576033 DOI: 10.1038/s41598-023-44526-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Accepted: 10/09/2023] [Indexed: 10/15/2023] Open
Abstract
In the field of applied microbiology, reproducibility and experimental variability are important factors that influence both basic research as well as process development for industrial applications. Experimental reproducibility and accuracy depend not only on culture conditions such as temperature and aeration but also on raw materials and procedures used for media preparation. The M9 minimal medium is one of the most common synthetic media for culturing Escherichia coli and other bacteria. This synthetic medium can be used to observe and evaluate the physiological activity of microbes under minimal nutritional requirements and determine the limiting factor for the desired phenotype. Although one of the advantages using the M9 medium is that its composition can be modulated, it is difficult to control presence of trace components and impurities from the reagents for preparing this medium. Herein, we showed that trace ingredients present in the reagents used for M9 media preparation affect the bacterial physiological activities (e.g., cell growth, substrate consumption, and byproduct formation). Additionally, we systematically identified the trace ingredient that influenced phenotypic differences. Our results showed that the selection of reagents and accuracy during reagent preparation is important for experimental reproducibility in the field of bio-engineering and systems biology focused on the systematic and continuous development of biomolecular systems (e.g., biorefinery, metabolic engineering, and synthetic biology).
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Affiliation(s)
- Yuki Soma
- Division of Metabolomics/Mass Spectrometry Center, Medical Research Center for High Depth Omics, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
- Laboratory for Synthetic Biology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, W5-729, 819-0395, Japan
| | - Saki Tominaga
- Division of Metabolomics/Mass Spectrometry Center, Medical Research Center for High Depth Omics, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Kanako Tokito
- Division of Metabolomics/Mass Spectrometry Center, Medical Research Center for High Depth Omics, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Yuri Imado
- Division of Metabolomics/Mass Spectrometry Center, Medical Research Center for High Depth Omics, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Kosuke Naka
- Shimadzu Corporation, 1, Nishinokyo-Kuwabara-cho, Nakagyo-ku, Kyoto, 604-8511, Japan
| | - Taizo Hanai
- Laboratory for Synthetic Biology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, W5-729, 819-0395, Japan
| | - Masatomo Takahashi
- Division of Metabolomics/Mass Spectrometry Center, Medical Research Center for High Depth Omics, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Yoshihiro Izumi
- Division of Metabolomics/Mass Spectrometry Center, Medical Research Center for High Depth Omics, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
| | - Takeshi Bamba
- Division of Metabolomics/Mass Spectrometry Center, Medical Research Center for High Depth Omics, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
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21
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Shigenobu K, Sudoh T, Murai J, Dokko K, Watanabe M, Ueno K. Ion Transport in Glyme- and Sulfolane-Based Highly Concentrated Electrolytes. CHEM REC 2023; 23:e202200301. [PMID: 36802142 DOI: 10.1002/tcr.202200301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/31/2023] [Indexed: 02/20/2023]
Abstract
Highly concentrated electrolytes (HCEs) have a similarity to ionic liquids (ILs) in high ionic nature, and indeed some of HECs are found to behave like an IL. HCEs have attracted considerable attention as prospective candidates for electrolyte materials in future lithium secondary batteries owing to their favorable properties both in the bulk and at the electrochemical interface. In this study, we highlight the effects of the solvent, counter anion, and diluent of HCEs on the Li+ ion coordination structure and transport properties (e. g., ionic conductivity and apparent Li+ ion transference number measured under anion-blocking conditions,t L i a b c ${{t}_{{\rm L}{\rm i}}^{{\rm a}{\rm b}{\rm c}}}$ ). Our studies on dynamic ion correlations unveiled the difference in the ion conduction mechanisms in HCEs and their intimate relevance tot L i a b c ${{t}_{{\rm L}{\rm i}}^{{\rm a}{\rm b}{\rm c}}}$ values. Our systematic analysis of the transport properties of HCEs also suggests the need for a compromise to simultaneously achieve high ionic conductivity and hight L i a b c ${{t}_{{\rm L}{\rm i}}^{{\rm a}{\rm b}{\rm c}}}$ values.
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Affiliation(s)
- Keisuke Shigenobu
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Taku Sudoh
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Junichi Murai
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Kaoru Dokko
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
- Institute of Advanced Sciences, Y, okohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Masayoshi Watanabe
- Institute of Advanced Sciences, Y, okohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Kazuhide Ueno
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
- Institute of Advanced Sciences, Y, okohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
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22
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Chida Y, Tomimori T, Ebata T, Taguchi N, Ioroi T, Hayashi K, Todoroki N, Wadayama T. Experimental study platform for electrocatalysis of atomic-level controlled high-entropy alloy surfaces. Nat Commun 2023; 14:4492. [PMID: 37495632 PMCID: PMC10372069 DOI: 10.1038/s41467-023-40246-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 07/14/2023] [Indexed: 07/28/2023] Open
Abstract
High-entropy alloys (HEAs) have attracted considerable attention to improve performance of various electrocatalyst materials. A comprehensive understanding of the relationship between surface atomic-level structures and catalytic properties is essential to boost the development of novel catalysts. In this study, we propose an experimental study platform that enables the vacuum synthesis of atomic-level-controlled single-crystal high-entropy alloy surfaces and evaluates their catalytic properties. The platform provides essential information that is crucial for the microstructural fundamentals of electrocatalysis, i.e., the detailed relationship between multi-component alloy surface microstructures and their catalytic properties. Nanometre-thick epitaxially stacking layers of Pt and equi-atomic-ratio Cr-Mn-Fe-Co-Ni, the so-called Cantor alloy, were synthesised on low-index single-crystal Pt substrates (Pt/Cr-Mn-Fe-Co-Ni/Pt(hkl)) as a Pt-based single-crystal alloy surface model for oxygen reduction reaction (ORR) electrocatalysis. The usefulness of the platform was demonstrated by showing the outperforming oxygen reduction reaction properties of high-entropy alloy surfaces when compared to Pt-Co binary surfaces.
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Affiliation(s)
- Yoshihiro Chida
- Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan.
| | - Takeru Tomimori
- Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan
| | - Tomoaki Ebata
- Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan
| | - Noboru Taguchi
- National Institute of Advanced Industrial Science and Technology, Ikeda, 563-8577, Japan
| | - Tsutomu Ioroi
- National Institute of Advanced Industrial Science and Technology, Ikeda, 563-8577, Japan
| | - Kenta Hayashi
- Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan
| | - Naoto Todoroki
- Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan
| | - Toshimasa Wadayama
- Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan
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23
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Chubachi T, Oguchi T, Morita K, Hayashi N, Kikuchi A, Watanabe KN. A statistical modeling approach based on the small-scale field trial and meteorological data for preliminary prediction of the impact of low temperature on Eucalyptus globulus trees. Sci Rep 2023; 13:10138. [PMID: 37349519 PMCID: PMC10287712 DOI: 10.1038/s41598-023-37038-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 06/14/2023] [Indexed: 06/24/2023] Open
Abstract
Eucalyptus trees are important for industrial forestry plantations because of their high potential for biomass production, but their susceptibility to damage at low temperatures restricts their plantation areas. In this study, a 6-year field trial of Eucalyptus globulus was conducted in Tsukuba, Japan, which is the northernmost reach of Eucalyptus plantations, and leaf damage was quantitatively monitored over four of six winters. Leaf photosynthetic quantum yield (QY) levels, an indicator of cold stress-induced damage, fluctuated synchronously with temperature in the winters. We performed a maximum likelihood estimation of the regression model explaining leaf QY using training data subsets for the first 3 years. The resulting model explained QY by the number of days when the daily maximum temperature was below 9.5 °C over approximately the last 7 weeks as an explanatory variable. The correlation coefficient and coefficient of determination of prediction by the model between the predicted and observed values were 0.84 and 0.70, respectively. The model was then used to perform two kinds of simulations. Geographical simulations of potential Eucalyptus plantation areas using global meteorological data from more than 5,000 locations around the world successfully predicted an area that generally agreed with the global Eucalyptus plantation distribution reported previously. Another simulation based on meteorological data of the past 70 years suggested that global warming will increase the potential E. globulus plantation area in Japan approximately 1.5-fold over the next 70 years. These results suggest that the model developed herein would be applicable to preliminary predictions of E. globulus cold damage in the field.
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Affiliation(s)
- Tomoaki Chubachi
- Graduate School of Science and Technology, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan
| | - Taichi Oguchi
- Institute of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan.
- Tsukuba Plant Innovation Research Center, University of Tsukuba, Gene Research Center Bldg., Ten-Nodai, Tsukuba, Ibaraki, 305-8572, Japan.
| | - Kazuki Morita
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan
| | - Nanami Hayashi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan
| | - Akira Kikuchi
- Institute of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan
- Tsukuba Plant Innovation Research Center, University of Tsukuba, Gene Research Center Bldg., Ten-Nodai, Tsukuba, Ibaraki, 305-8572, Japan
| | - Kazuo N Watanabe
- Institute of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan
- Tsukuba Plant Innovation Research Center, University of Tsukuba, Gene Research Center Bldg., Ten-Nodai, Tsukuba, Ibaraki, 305-8572, Japan
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24
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Iwasaki T, Tsuge K, Naito N, Nozaki K. Chemoselectivity change in catalytic hydrogenolysis enabling urea-reduction to formamide/amine over more reactive carbonyl compounds. Nat Commun 2023; 14:3279. [PMID: 37308470 DOI: 10.1038/s41467-023-38997-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Accepted: 05/24/2023] [Indexed: 06/14/2023] Open
Abstract
The selective transformation of a less reactive carbonyl moiety in the presence of more reactive ones can realize straightforward and environmentally benign chemical processes. However, such a transformation is highly challenging because the reactivity of carbonyl compounds, one of the most important functionalities in organic chemistry, depends on the substituents on the carbon atom. Herein, we report an Ir catalyst for the selective hydrogenolysis of urea derivatives, which are the least reactive carbonyl compounds, affording formamides and amines. Although formamide, as well as ester, amide, and carbamate substituents, are considered to be more reactive than urea, the proposed Ir catalyst tolerated these carbonyl groups and reacted with urea in a highly chemoselective manner. The proposed chemo- and regioselective hydrogenolysis allows the development of a strategy for the chemical recycling of polyurea resins.
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Affiliation(s)
- Takanori Iwasaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
| | - Kazuki Tsuge
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Naoki Naito
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
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25
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Yamada T, Teranishi W, Sakurada N, Ootori S, Abe Y, Matsuo T, Morii Y, Yoshimura M, Yoshimura T, Ikawa T, Sajiki H. Microwave-assisted C-C bond formation of diarylacetylenes and aromatic hydrocarbons on carbon beads under continuous-flow conditions. Commun Chem 2023; 6:78. [PMID: 37095153 PMCID: PMC10123573 DOI: 10.1038/s42004-023-00880-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 04/14/2023] [Indexed: 04/26/2023] Open
Abstract
The synthesis of polycyclic aromatic compounds generally requires stoichiometric oxidants or homogeneous metal catalysts, however, the risk of contamination of inorganic residues can affect their properties. Here we present a microwave (MW)-assisted platinum on beaded activated carbon (Pt/CB)-catalyzed C-C bond formation of diarylacetylenes and aromatic hydrocarbons under continuous-flow conditions. Various fused aromatic compounds were continuously synthesized via dehydrogenative C(sp2)-C(sp2) and C(sp2)-C(sp3) bond formation with yields of up to 87% without the use of oxidants and bases. An activated, local reaction site on Pt/CB in the flow reaction channel reaching temperatures of more than three hundred degrees Celsius was generated in the catalyst cartridge by selective microwave absorption in CB with an absorption efficiency of > 90%. Mechanistic experiments of the transformation reaction indicated that a constant hydrogen gas supply was essential for activating Pt. This is an ideal reaction with minimal input energy and no waste production.
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Affiliation(s)
- Tsuyoshi Yamada
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University 1-25-4 Daigaku-Nishi, Gifu, 501-1196, Gifu, Japan
| | - Wataru Teranishi
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University 1-25-4 Daigaku-Nishi, Gifu, 501-1196, Gifu, Japan
| | - Naoya Sakurada
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University 1-25-4 Daigaku-Nishi, Gifu, 501-1196, Gifu, Japan
| | - Seiya Ootori
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University 1-25-4 Daigaku-Nishi, Gifu, 501-1196, Gifu, Japan
| | - Yuka Abe
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University 1-25-4 Daigaku-Nishi, Gifu, 501-1196, Gifu, Japan
| | - Tomohiro Matsuo
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University 1-25-4 Daigaku-Nishi, Gifu, 501-1196, Gifu, Japan
| | - Yasuharu Morii
- Product Division, Tokyo Rikakikai Co., Ltd. (Brand: EYELA), 1-15-17 Koishikawa, Bunkyo-Ku, 112-0002, Tokyo, Japan
| | - Masatoshi Yoshimura
- R&D Center, N.E. Chemcat Corporation, 678 Ipponnmatsu, Numazu, 410-0314, Shizuoka, Japan
| | - Takeo Yoshimura
- SAIDA FDS INC., 143-10 Isshiki, Yaizu, 425-0054, Shizuoka, Japan
| | - Takashi Ikawa
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University 1-25-4 Daigaku-Nishi, Gifu, 501-1196, Gifu, Japan
| | - Hironao Sajiki
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University 1-25-4 Daigaku-Nishi, Gifu, 501-1196, Gifu, Japan.
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26
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Oshita M, Saito S, Kan T. Electromechanically reconfigurable plasmonic photodetector with a distinct shift in resonant wavelength. Microsyst Nanoeng 2023; 9:26. [PMID: 36910257 PMCID: PMC9998386 DOI: 10.1038/s41378-023-00504-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 02/01/2023] [Accepted: 02/05/2023] [Indexed: 06/18/2023]
Abstract
Plasmonic photodetectors have received increasing attention because their detection properties can be designed by tailoring their metal structures on surfaces without using any additional components. Reconfiguration of the plasmonic resonant state in a photodetector is relevant for various applications, including investigating in situ adaptive detection property changes, depending on the situation, and performing single-pixel spectroscopy in geometrically limited regions. However, the spectral responsivity change with conventional reconfiguration methods is relatively small. Here, we propose a plasmonic photodetector that reconfigures its spectral responsivity with electromechanical deformation instead of bias tuning. The photodetector consists of a gold plasmonic grating formed on an n-type silicon cantilever, and the spectral responsivity is reconfigured by electromechanically scanning at an incident angle to the grating on the cantilever. The photodetector exhibits peak shifts in spectral responsivity in a wavelength range from 1250 to 1310 nm after electromechanical reconfiguration. Finally, for potential future applications, we demonstrate near-infrared spectroscopy using the photodetector. This photodetector has the potential to be adopted as a near-infrared spectrometer in industrial silicon imaging systems because its structure enables subbandgap photodetection on silicon by a Schottky junction.
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Affiliation(s)
- Masaaki Oshita
- Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu-city, Tokyo 182-8585 Japan
| | - Shiro Saito
- IMRA JAPAN CO., LTD, 2-36, Hachiken-cho, Kariya, Aichi 448-8650 Japan
| | - Tetsuo Kan
- Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu-city, Tokyo 182-8585 Japan
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Watanabe N, Hirose R, Yamauchi K, Miyazaki H, Bandou R, Yoshida T, Doi T, Inoue K, Dohi O, Yoshida N, Uchiyama K, Ishikawa T, Takagi T, Konishi H, Ikegaya H, Nakaya T, Itoh Y. Evaluation of Environmental Stability and Disinfectant Effectiveness for Human Coronavirus OC43 on Human Skin Surface. Microbiol Spectr 2023; 11:e0238122. [PMID: 36840603 PMCID: PMC10100891 DOI: 10.1128/spectrum.02381-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 02/04/2023] [Indexed: 02/24/2023] Open
Abstract
The environmental stability of human coronavirus OC43 (HCoV-OC43) on the surface of human skin and the effectiveness of disinfectant against HCoV-OC43, which are important to prevent contact transmission, have not been clarified in previous studies. Using previously generated models, we evaluated HCoV-OC43 stability and disinfection effectiveness. Then we compared the results with those for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The median survival time of HCoV-OC43 on the surface of human skin was 24.6 h (95% confidence interval, 19.7 to 29.6 h), which was higher than that of SARS-CoV-2 (10.8 h). Although the in vitro disinfectant effectiveness evaluation showed that HCoV-OC43 has a higher ethanol resistance than SARS-CoV-2, HCoV-OC43 on the skin surface was completely inactivated by a minimum of 50% ethanol within 5 s (the log reduction values were >4.0). Moreover, 1.0% chlorhexidine gluconate and 0.2% benzalkonium chloride showed relatively high disinfectant effectiveness, and the log reduction values when these disinfectants were applied for 15 s were >3.0. HCoV-OC43 is highly stable on the skin surface, which may increase the risk of contact transmission. Although HCoV-OC43 has relatively high ethanol resistance, appropriate hand hygiene practices with current alcohol-based disinfectants sufficiently reduce the risk of contact transmission. IMPORTANCE This study revealed the environmental stability of HCoV-OC43 and disinfectant effectiveness against HCoV-OC43, which had not been demonstrated in previous studies. HCoV-OC43 is highly stable on the surface of human skin, with a survival time of approximately 25 h. High stability of HCoV-OC43 may increase the risk of contact transmission. Furthermore, the in vitro disinfectant effectiveness evaluation showed that HCoV-OC43, which is classified as an envelope virus, has a relatively high ethanol resistance. This finding suggests that disinfectant effectiveness may vary greatly depending on the virus and that each virus targeted for infection control should be evaluated individually. HCoV-OC43 on the skin surface was rapidly inactivated by 50% ethanol, which suggests that appropriate hand hygiene practices with current alcohol-based disinfectants can sufficiently reduce the risk of HCoV-OC43 contact transmission.
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Affiliation(s)
- Naoto Watanabe
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Ryohei Hirose
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
- Department of Infectious Diseases, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Katsuma Yamauchi
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hajime Miyazaki
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Risa Bandou
- Department of Infectious Diseases, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
- Department of Forensics Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takuma Yoshida
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Toshifumi Doi
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Ken Inoue
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Osamu Dohi
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Naohisa Yoshida
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Kazuhiko Uchiyama
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takeshi Ishikawa
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Tomohisa Takagi
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hideyuki Konishi
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hiroshi Ikegaya
- Department of Forensics Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takaaki Nakaya
- Department of Infectious Diseases, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yoshito Itoh
- Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
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28
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Agyekum DVA, Kobayashi T, Dastogeer KMG, Yasuda M, Sarkodee-Addo E, Ratu STN, Xu Q, Miki T, Matsuura E, Okazaki S. Diversity and function of soybean rhizosphere microbiome under nature farming. Front Microbiol 2023; 14:1130969. [PMID: 36937301 PMCID: PMC10014912 DOI: 10.3389/fmicb.2023.1130969] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 02/10/2023] [Indexed: 03/05/2023] Open
Abstract
Nature farming is a farming system that entails cultivating crops without using chemical fertilizers and pesticides. The present study investigated the bacterial and fungal communities in the rhizosphere of soybean grown in conventional and nature farming soils using wild-type and non-nodulating mutant soybean. The effect of soil fumigant was also analyzed to reveal its perturbation of microbial communities and subsequent effects on the growth of soybean. Overall, the wild-type soybean exhibited a better growth index compared to mutant soybean and especially in nature farming. Nodulation and arbuscular mycorrhiza (AM) fungi colonization were higher in plants under nature farming than in conventionally managed soil; however, fumigation drastically affected these symbioses with greater impacts on plants in nature farming soil. The rhizosphere microbiome diversity in nature farming was higher than that in conventional farming for both cultivars. However, the diversity was significantly decreased after fumigation treatment with a greater impact on nature farming. Principal coordinate analysis revealed that nature farming and conventional farming soil harbored distinct microbial communities and that soil fumigation significantly altered the communities in nature farming soils but not in conventional farming soils. Intriguingly, some beneficial microbial taxa related to plant growth and health, including Rhizobium, Streptomyces, and Burkholderia, were found as distinct microbes in the nature farming soil but were selectively bleached by fumigant treatment. Network analysis revealed a highly complex microbial network with high taxa connectivity observed under nature farming soil than in conventional soil; however, fumigation strongly broke it. Overall, the results highlighted that nature farming embraced higher microbial diversity and the abundance of beneficial soil microbes with a complex and interconnected network structure, and also demonstrated the underlying resilience of the microbial community to environmental perturbations, which is critical under nature farming where chemical fertilizers and pesticides are not applied.
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Affiliation(s)
- Dominic V. A. Agyekum
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Japan
| | - Tatsuyuki Kobayashi
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Japan
| | - Khondoker M. G. Dastogeer
- Department of Plant Pathology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh, Bangladesh
| | - Michiko Yasuda
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Japan
| | - Elsie Sarkodee-Addo
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Japan
| | - Safirah T. N. Ratu
- Institute of Global Innovation Research, Tokyo University of Agriculture and Technology, Fuchu, Japan
| | - Qicong Xu
- International Nature Farming Research Center, Nagano, Japan
| | - Takaaki Miki
- International Nature Farming Research Center, Nagano, Japan
| | - Eri Matsuura
- College of Agriculture, Ibaraki University, Mito, Japan
| | - Shin Okazaki
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Japan
- Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Japan
- Institute of Global Innovation Research, Tokyo University of Agriculture and Technology, Fuchu, Japan
- *Correspondence: Shin Okazaki,
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29
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Yang K, Suzuki A, Ye J, Nosato H, Izumori A, Sakanashi H. CTG-Net: Cross-task guided network for breast ultrasound diagnosis. PLoS One 2022; 17:e0271106. [PMID: 35951606 PMCID: PMC9371312 DOI: 10.1371/journal.pone.0271106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 06/24/2022] [Indexed: 11/19/2022] Open
Abstract
Deep learning techniques have achieved remarkable success in lesion segmentation and classification between benign and malignant tumors in breast ultrasound images. However, existing studies are predominantly focused on devising efficient neural network-based learning structures to tackle specific tasks individually. By contrast, in clinical practice, sonographers perform segmentation and classification as a whole; they investigate the border contours of the tissue while detecting abnormal masses and performing diagnostic analysis. Performing multiple cognitive tasks simultaneously in this manner facilitates exploitation of the commonalities and differences between tasks. Inspired by this unified recognition process, this study proposes a novel learning scheme, called the cross-task guided network (CTG-Net), for efficient ultrasound breast image understanding. CTG-Net integrates the two most significant tasks in computerized breast lesion pattern investigation: lesion segmentation and tumor classification. Further, it enables the learning of efficient feature representations across tasks from ultrasound images and the task-specific discriminative features that can greatly facilitate lesion detection. This is achieved using task-specific attention models to share the prediction results between tasks. Then, following the guidance of task-specific attention soft masks, the joint feature responses are efficiently calibrated through iterative model training. Finally, a simple feature fusion scheme is used to aggregate the attention-guided features for efficient ultrasound pattern analysis. We performed extensive experimental comparisons on multiple ultrasound datasets. Compared to state-of-the-art multi-task learning approaches, the proposed approach can improve the Dice’s coefficient, true-positive rate of segmentation, AUC, and sensitivity of classification by 11%, 17%, 2%, and 6%, respectively. The results demonstrate that the proposed cross-task guided feature learning framework can effectively fuse the complementary information of ultrasound image segmentation and classification tasks to achieve accurate tumor localization. Thus, it can aid sonographers to detect and diagnose breast cancer.
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Affiliation(s)
- Kaiwen Yang
- Graduate School of Science and Technology, University of Tsukuba, Tsukuba, Japan
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
- * E-mail:
| | - Aiga Suzuki
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
| | - Jiaxing Ye
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
| | - Hirokazu Nosato
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
| | | | - Hidenori Sakanashi
- Graduate School of Science and Technology, University of Tsukuba, Tsukuba, Japan
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
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30
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Ito Y, Ishigami M, Terai G, Nakamura Y, Hashiba N, Nishi T, Nakazawa H, Hasunuma T, Asai K, Umetsu M, Ishii J, Kondo A. A streamlined strain engineering workflow with genome-wide screening detects enhanced protein secretion in Komagataella phaffii. Commun Biol 2022; 5:561. [PMID: 35676418 PMCID: PMC9177720 DOI: 10.1038/s42003-022-03475-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 05/11/2022] [Indexed: 11/26/2022] Open
Abstract
Expression of secreted recombinant proteins burdens the protein secretion machinery, limiting production. Here, we describe an approach to improving protein production by the non-conventional yeast Komagataella phaffii comprised of genome-wide screening for effective gene disruptions, combining them in a single strain, and recovering growth reduction by adaptive evolution. For the screen, we designed a multiwell-formatted, streamlined workflow to high-throughput assay of secretion of a single-chain small antibody, which is cumbersome to detect but serves as a good model of proteins that are difficult to secrete. Using the consolidated screening system, we evaluated >19,000 mutant strains from a mutant library prepared by a modified random gene-disruption method, and identified six factors for which disruption led to increased antibody production. We then combined the disruptions, up to quadruple gene knockouts, which appeared to contribute independently, in a single strain and observed an additive effect. Target protein and promoter were basically interchangeable for the effects of knockout genes screened. We finally used adaptive evolution to recover reduced cell growth by multiple gene knockouts and examine the possibility for further enhancing protein secretion. Our successful, three-part approach holds promise as a method for improving protein production by non-conventional microorganisms.
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Affiliation(s)
- Yoichiro Ito
- Engineering Biology Research Center, Kobe University, Kobe, Japan
- Graduate School of Science, Technology and Innovation, Kobe University, Kobe, Japan
| | - Misa Ishigami
- Technology Research Association of Highly Efficient Gene Design (TRAHED), Kobe, Japan
| | - Goro Terai
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, University of Tokyo, Chiba, Japan
| | - Yasuyuki Nakamura
- Engineering Biology Research Center, Kobe University, Kobe, Japan
- Graduate School of Science, Technology and Innovation, Kobe University, Kobe, Japan
| | - Noriko Hashiba
- Technology Research Association of Highly Efficient Gene Design (TRAHED), Kobe, Japan
| | - Teruyuki Nishi
- Graduate School of Science, Technology and Innovation, Kobe University, Kobe, Japan
- Bio-Pharma Research Laboratories, Kaneka Corporation, Takasago, Japan
| | - Hikaru Nakazawa
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan
| | - Tomohisa Hasunuma
- Engineering Biology Research Center, Kobe University, Kobe, Japan
- Graduate School of Science, Technology and Innovation, Kobe University, Kobe, Japan
| | - Kiyoshi Asai
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, University of Tokyo, Chiba, Japan
| | - Mitsuo Umetsu
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai, Japan
| | - Jun Ishii
- Engineering Biology Research Center, Kobe University, Kobe, Japan.
- Graduate School of Science, Technology and Innovation, Kobe University, Kobe, Japan.
| | - Akihiko Kondo
- Engineering Biology Research Center, Kobe University, Kobe, Japan.
- Graduate School of Science, Technology and Innovation, Kobe University, Kobe, Japan.
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Kobe, Japan.
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31
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Wada N, Osakabe K, Osakabe Y. Expanding the plant genome editing toolbox with recently developed CRISPR-Cas systems. Plant Physiol 2022; 188:1825-1837. [PMID: 35099553 PMCID: PMC8968252 DOI: 10.1093/plphys/kiac027] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 01/13/2022] [Indexed: 05/15/2023]
Abstract
Since its first appearance, CRISPR-Cas9 has been developed extensively as a programmable genome-editing tool, opening a new era in plant genome engineering. However, CRISPR-Cas9 still has some drawbacks, such as limitations of the protospacer-adjacent motif (PAM) sequence, target specificity, and the large size of the cas9 gene. To combat invading bacterial phages and plasmid DNAs, bacteria and archaea have diverse and unexplored CRISPR-Cas systems, which have the potential to be developed as a useful genome editing tools. Recently, discovery and characterization of additional CRISPR-Cas systems have been reported. Among them, several CRISPR-Cas systems have been applied successfully to plant and human genome editing. For example, several groups have achieved genome editing using CRISPR-Cas type I-D and type I-E systems, which had never been applied for genome editing previously. In addition to higher specificity and recognition of different PAM sequences, recently developed CRISPR-Cas systems often provide unique characteristics that differ from well-known Cas proteins such as Cas9 and Cas12a. For example, type I CRISPR-Cas10 induces small indels and bi-directional long-range deletions ranging up to 7.2 kb in tomatoes (Solanum lycopersicum L.). Type IV CRISPR-Cas13 targets RNA, not double-strand DNA, enabling highly specific knockdown of target genes. In this article, we review the development of CRISPR-Cas systems, focusing especially on their application to plant genome engineering. Recent CRISPR-Cas tools are helping expand our plant genome engineering toolbox.
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Affiliation(s)
- Naoki Wada
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima, Japan
| | - Keishi Osakabe
- Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima, Japan
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32
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Tao H, Mori T, Chen H, Lyu S, Nonoyama A, Lee S, Abe I. Molecular insights into the unusually promiscuous and catalytically versatile Fe(II)/α-ketoglutarate-dependent oxygenase SptF. Nat Commun 2022; 13:95. [PMID: 35013177 PMCID: PMC8748661 DOI: 10.1038/s41467-021-27636-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 12/01/2021] [Indexed: 11/23/2022] Open
Abstract
Non-heme iron and α-ketoglutarate-dependent (Fe/αKG) oxygenases catalyze various oxidative biotransformations. Due to their catalytic flexibility and high efficiency, Fe/αKG oxygenases have attracted keen attention for their application as biocatalysts. Here, we report the biochemical and structural characterizations of the unusually promiscuous and catalytically versatile Fe/αKG oxygenase SptF, involved in the biosynthesis of fungal meroterpenoid emervaridones. The in vitro analysis revealed that SptF catalyzes several continuous oxidation reactions, including hydroxylation, desaturation, epoxidation, and skeletal rearrangement. SptF exhibits extremely broad substrate specificity toward various meroterpenoids, and efficiently produced unique cyclopropane-ring-fused 5/3/5/5/6/6 and 5/3/6/6/6 scaffolds from terretonins. Moreover, SptF also hydroxylates steroids, including androsterone, testosterone, and progesterone, with different regiospecificities. Crystallographic and structure-based mutagenesis studies of SptF revealed the molecular basis of the enzyme reactions, and suggested that the malleability of the loop region contributes to the remarkable substrate promiscuity. SptF exhibits great potential as a promising biocatalyst for oxidation reactions.
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Affiliation(s)
- Hui Tao
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Takahiro Mori
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.
- Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Tokyo, Japan.
- PRESTO, Japan Science and Technology Agency, Saitama, Japan.
| | - Heping Chen
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Shuang Lyu
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | | | - Shoukou Lee
- Sumitomo Dainippon Pharma Co., Ltd, Osaka, Japan
| | - Ikuro Abe
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.
- Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Tokyo, Japan.
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33
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Arashida H, Odake H, Sugawara M, Noda R, Kakizaki K, Ohkubo S, Mitsui H, Sato S, Minamisawa K. Evolution of rhizobial symbiosis islands through insertion sequence-mediated deletion and duplication. ISME J 2022; 16:112-121. [PMID: 34272493 PMCID: PMC8692435 DOI: 10.1038/s41396-021-01035-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 05/27/2021] [Accepted: 06/03/2021] [Indexed: 11/08/2022]
Abstract
Symbiosis between organisms influences their evolution via adaptive changes in genome architectures. Immunity of soybean carrying the Rj2 allele is triggered by NopP (type III secretion system [T3SS]-dependent effector), encoded by symbiosis island A (SymA) in B. diazoefficiens USDA122. This immunity was overcome by many mutants with large SymA deletions that encompassed T3SS (rhc) and N2 fixation (nif) genes and were bounded by insertion sequence (IS) copies in direct orientation, indicating homologous recombination between ISs. Similar deletion events were observed in B. diazoefficiens USDA110 and B. japonicum J5. When we cultured a USDA122 strain with a marker gene sacB inserted into the rhc gene cluster, most sucrose-resistant mutants had deletions in nif/rhc gene clusters, similar to the mutants above. Some deletion mutants were unique to the sacB system and showed lower competitive nodulation capability, indicating that IS-mediated deletions occurred during free-living growth and the host plants selected the mutants. Among 63 natural bradyrhizobial isolates, 2 possessed long duplications (261-357 kb) harboring nif/rhc gene clusters between IS copies in direct orientation via homologous recombination. Therefore, the structures of symbiosis islands are in a state of flux via IS-mediated duplications and deletions during rhizobial saprophytic growth, and host plants select mutualistic variants from the resultant pools of rhizobial populations. Our results demonstrate that homologous recombination between direct IS copies provides a natural mechanism generating deletions and duplications on symbiosis islands.
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Affiliation(s)
- Haruka Arashida
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan
| | - Haruka Odake
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan
| | - Masayuki Sugawara
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan
| | - Ryota Noda
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan
| | - Kaori Kakizaki
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan
| | - Satoshi Ohkubo
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan
| | - Hisayuki Mitsui
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan
| | - Shusei Sato
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan
| | - Kiwamu Minamisawa
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan.
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34
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Abstract
Phase transition of anisotropic materials is ubiquitously observed in physics, biology, materials science, and engineering. Nevertheless, how anisotropy of constituent molecules affects the phase transition dynamics is still poorly understood. Here we investigate numerically the phase transition of a simple model system composed of anisotropic molecules, and report on our discovery of multistep nucleation of nuclei with layered positional ordering (smectic ordering), from a fluid-like nematic phase with orientational order only (no positional order). A trinity of molecular dynamics simulation, machine learning, and molecular cluster analysis yielding free energy landscapes unambiguously demonstrates the dynamics of multistep nucleation process involving characteristic metastable clusters that precede supercritical smectic nuclei and cannot be accounted for by the classical nucleation theory. Our work suggests that molecules of simple shape can exhibit rich and complex nucleation processes, and our numerical approach will provide deeper understanding of phase transitions and resulting structures in anisotropic materials such as biological systems and functional materials.
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Affiliation(s)
- Kazuaki Z Takahashi
- Research Center for Computational Design of Advanced Functional Materials, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan.
| | - Takeshi Aoyagi
- Research Center for Computational Design of Advanced Functional Materials, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan
| | - Jun-Ichi Fukuda
- Department of Physics, Faculty of Science, Kyushu University, Fukuoka, Fukuoka, Japan
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35
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Suzuki G, Saito Y, Seki M, Evans-Yamamoto D, Negishi M, Kakoi K, Kawai H, Landry CR, Yachie N, Mitsuyama T. Machine learning approach for discrimination of genotypes based on bright-field cellular images. NPJ Syst Biol Appl 2021; 7:31. [PMID: 34290253 PMCID: PMC8295336 DOI: 10.1038/s41540-021-00190-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 07/01/2021] [Indexed: 12/19/2022] Open
Abstract
Morphological profiling is a combination of established optical microscopes and cutting-edge machine vision technologies, which stacks up successful applications in high-throughput phenotyping. One major question is how much information can be extracted from an image to identify genetic differences between cells. While fluorescent microscopy images of specific organelles have been broadly used for single-cell profiling, the potential ability of bright-field (BF) microscopy images of label-free cells remains to be tested. Here, we examine whether single-gene perturbation can be discriminated based on BF images of label-free cells using a machine learning approach. We acquired hundreds of BF images of single-gene mutant cells, quantified single-cell profiles consisting of texture features of cellular regions, and constructed a machine learning model to discriminate mutant cells from wild-type cells. Interestingly, the mutants were successfully discriminated from the wild type (area under the receiver operating characteristic curve = 0.773). The features that contributed to the discrimination were identified, and they included those related to the morphology of structures that appeared within cellular regions. Furthermore, functionally close gene pairs showed similar feature profiles of the mutant cells. Our study reveals that single-gene mutant cells can be discriminated from wild-type cells based on BF images, suggesting the potential as a useful tool for mutant cell profiling.
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Affiliation(s)
- Godai Suzuki
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, 135-0064, Japan
| | - Yutaka Saito
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, 135-0064, Japan
- AIST-Waseda University Computational Bio Big-Data Open Innovation Laboratory (CBBD-OIL), Tokyo, 169-8555, Japan
- Graduate School of Frontier Sciences, The University of Tokyo, Chiba, 277-8561, Japan
| | - Motoaki Seki
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, 153-8904, Japan
| | - Daniel Evans-Yamamoto
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, 153-8904, Japan
- Institute for Advanced Biosciences, Keio University, Tsuruoka, 997-0035, Japan
- Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, 252-0882, Japan
| | - Mikiko Negishi
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, 153-8904, Japan
| | - Kentaro Kakoi
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, 153-8904, Japan
| | - Hiroki Kawai
- Research and Development Department, LPIXEL Inc., Tokyo, 100-0004, Japan
| | - Christian R Landry
- Institut de Biologie Intégrative et des Systémes, Université Laval, Québec, QC, G1V 0A6, Canada
- Département de Biochimie, Microbiologie et Bio-informatique, Faculté de sciences et génie, Université Laval, Québec, QC, G1V 0A6, Canada
- PROTEO, le regroupement québécois de recherche sur la fonction, l'ingénierie et les applications des protéines, Université Laval, Québec, QC, G1V 0A6, Canada
- Centre de Recherche en Données Massives (CRDM), Université Laval, Québec, QC, G1V 0A6, Canada
- Département de Biologie, Faculté des sciences et de Génie, Université Laval, Québec, QC, G1V 0A6, Canada
| | - Nozomu Yachie
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, 153-8904, Japan.
- Institute for Advanced Biosciences, Keio University, Tsuruoka, 997-0035, Japan.
- Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, 252-0882, Japan.
- School of Biomedical Engineering, The University of British Columbia, Vancouver, V6T1Z3, Canada.
| | - Toutai Mitsuyama
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, 135-0064, Japan.
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36
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Mori T, Zhai R, Ushimaru R, Matsuda Y, Abe I. Molecular insights into the endoperoxide formation by Fe(II)/α-KG-dependent oxygenase NvfI. Nat Commun 2021; 12:4417. [PMID: 34285212 PMCID: PMC8292354 DOI: 10.1038/s41467-021-24685-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 06/30/2021] [Indexed: 11/08/2022] Open
Abstract
Endoperoxide-containing natural products are a group of compounds with structurally unique cyclized peroxide moieties. Although numerous endoperoxide-containing compounds have been isolated, the biosynthesis of the endoperoxides remains unclear. NvfI from Aspergillus novofumigatus IBT 16806 is an endoperoxidase that catalyzes the formation of fumigatonoid A in the biosynthesis of novofumigatonin. Here, we describe our structural and functional analyses of NvfI. The structural elucidation and mutagenesis studies indicate that NvfI does not utilize a tyrosyl radical in the reaction, in contrast to other characterized endoperoxidases. Further, the crystallographic analysis reveals significant conformational changes of two loops upon substrate binding, which suggests a dynamic movement of active site during the catalytic cycle. As a result, NvfI installs three oxygen atoms onto a substrate in a single enzyme turnover. Based on these results, we propose a mechanism for the NvfI-catalyzed, unique endoperoxide formation reaction to produce fumigatonoid A.
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Affiliation(s)
- Takahiro Mori
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
- Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan.
| | - Rui Zhai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Richiro Ushimaru
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
- Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
- ACT-X, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
| | - Yudai Matsuda
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - Ikuro Abe
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
- Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
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37
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Inoue K, Nakajima K, Kuniyoshi Y. Designing spontaneous behavioral switching via chaotic itinerancy. Sci Adv 2020; 6:6/46/eabb3989. [PMID: 33177080 PMCID: PMC7673744 DOI: 10.1126/sciadv.abb3989] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Accepted: 09/24/2020] [Indexed: 05/09/2023]
Abstract
Chaotic itinerancy is a frequently observed phenomenon in high-dimensional nonlinear dynamical systems and is characterized by itinerant transitions among multiple quasi-attractors. Several studies have pointed out that high-dimensional activity in animal brains can be observed to exhibit chaotic itinerancy, which is considered to play a critical role in the spontaneous behavior generation of animals. Thus, how to design desired chaotic itinerancy is a topic of great interest, particularly for neurorobotics researchers who wish to understand and implement autonomous behavioral controls. However, it is generally difficult to gain control over high-dimensional nonlinear dynamical systems. In this study, we propose a method for implementing chaotic itinerancy reproducibly in a high-dimensional chaotic neural network. We demonstrate that our method enables us to easily design both the trajectories of quasi-attractors and the transition rules among them simply by adjusting the limited number of system parameters and by using the intrinsic high-dimensional chaos.
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Affiliation(s)
- Katsuma Inoue
- Graduate School of Information Science and Technology, The University of Tokyo, Engineering Building 2, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Kohei Nakajima
- Graduate School of Information Science and Technology, The University of Tokyo, Engineering Building 2, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Yasuo Kuniyoshi
- Graduate School of Information Science and Technology, The University of Tokyo, Engineering Building 2, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
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38
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Matsumoto D, Tamamura H, Nomura W. A cell cycle-dependent CRISPR-Cas9 activation system based on an anti-CRISPR protein shows improved genome editing accuracy. Commun Biol 2020; 3:601. [PMID: 33097793 PMCID: PMC7584632 DOI: 10.1038/s42003-020-01340-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Accepted: 09/25/2020] [Indexed: 12/11/2022] Open
Abstract
The development of genome editing systems based on the Cas9 endonuclease has greatly facilitated gene knockouts and targeted genetic alterations. Precise editing of target genes without off-target effects is crucial to prevent adverse effects in clinical applications. Although several methods have been reported to result in less off-target effects associated with the CRISPR technology, these often exhibit lower editing efficiency. Therefore, efficient, accurate, and innocuous CRISPR technology is still required. Anti-CRISPR proteins are natural inhibitors of CRISPR-Cas systems derived from bacteriophages. Here, the anti-CRISPR protein, AcrIIA4, was fused with the N terminal region of human Cdt1 that is degraded specifically in S and G2, the phases of the cell cycle when homology-directed repair (HDR) is dominant. Co-expression of SpyCas9 and AcrIIA4-Cdt1 not only increases the frequency of HDR but also suppress off-targets effects. Thus, the combination of SpyCas9 and AcrIIA4-Cdt1 is a cell cycle-dependent Cas9 activation system for accurate and efficient genome editing.
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Affiliation(s)
- Daisuke Matsumoto
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo, 101-0062, Japan
- Daisuke Matsumoto, Department of Chemistry, The Scripps Research Institute, La Jolla, CA, 92037, USA
| | - Hirokazu Tamamura
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo, 101-0062, Japan
| | - Wataru Nomura
- Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo, 101-0062, Japan.
- Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima, 734-8553, Japan.
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39
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Nakayama K, Ishikawa R, Kobayashi S, Shibata N, Ikuhara Y. Dislocation and oxygen-release driven delithiation in Li 2MnO 3. Nat Commun 2020; 11:4452. [PMID: 32901015 PMCID: PMC7479600 DOI: 10.1038/s41467-020-18285-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 08/14/2020] [Indexed: 11/09/2022] Open
Abstract
Lithium-excess layered cathode materials such as Li2MnO3 have attracted much attention owing to their high energy densities. It has been proposed that oxygen-release and cation-mixing might be induced by delithiation. However, it is still unclear as to how the delithiated-region grows. Here, by using atomic-resolution scanning transmission electron microscopy combined with electron energy-loss spectroscopy, we directly observe the atomic structures at the interface between pristine and delithiated regions in the partially delithiated Li2MnO3 single crystal. We elucidate that the delithiated regions have extensive amounts of irreversible defects such as oxygen-release and Mn/Li cation-mixing. At the interface, a partially cation disordered structure is formed, where Mn migration occurred only in the specific Mn/Li layers. Besides, a number of dislocations are formed at the interface to compensate the lattice mismatch between the pristine and delithiated regions. The observed oxygen-release and dislocations could govern the growth of delithiated-regions and performance degradation in Li2MnO3.
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Affiliation(s)
- Kei Nakayama
- Institute of Engineering Innovation, University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan
| | - Ryo Ishikawa
- Institute of Engineering Innovation, University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama, 332-0012, Japan
| | - Shunsuke Kobayashi
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, 456-8587, Japan
| | - Naoya Shibata
- Institute of Engineering Innovation, University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, 456-8587, Japan
| | - Yuichi Ikuhara
- Institute of Engineering Innovation, University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan.
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, 456-8587, Japan.
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40
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Shimizu K, Diño WA, Nakanishi H, Kasai H, Takeyasu K, Fukutani K, Yajima A. Dynamical Quantum Filtering via Enhanced Scattering of para-H 2 on the Orientationally Anisotropic Potential of SrTiO 3(001). Sci Rep 2020; 10:5939. [PMID: 32246021 PMCID: PMC7125136 DOI: 10.1038/s41598-020-62605-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 03/17/2020] [Indexed: 11/29/2022] Open
Abstract
Quantum dynamics calculation, performed on top of density functional theory (DFT)-based total energy calculations, show dynamical quantum filtering via enhanced scattering of para-H2 on SrTiO3(001). We attribute this to the strongly orientation-dependent (electrostatic) interaction potential between the H2 (induced) quadrupole moment and the surface electric field gradient of ionic SrTiO3(001). These results suggest that ionic surfaces could function as a scattering/filtering media to realize rotationally state-resolved H2. This could find significant applications not only in H2 storage and transport, but also in realizing materials with pre-determined characteristic properties.
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Grants
- 17K06818 Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- 17H01057 Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- 15H05736 Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- 15KT0062 Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- New Energy and Industrial Technology Development Organization (NEDO)
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Affiliation(s)
- Koji Shimizu
- Department of Applied Physics, Osaka University, Osaka, 565-0871, Japan
| | - Wilson Agerico Diño
- Department of Applied Physics, Osaka University, Osaka, 565-0871, Japan.
- Center for Atomic and Molecular Technologies, Osaka University, Osaka, 565-0871, Japan.
| | - Hiroshi Nakanishi
- Department of Applied Physics, Osaka University, Osaka, 565-0871, Japan
- National Institute of Technology, Akashi College, Hyogo, 674-8501, Japan
| | - Hideaki Kasai
- Department of Applied Physics, Osaka University, Osaka, 565-0871, Japan
- National Institute of Technology, Akashi College, Hyogo, 674-8501, Japan
- Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan
| | - Kotaro Takeyasu
- Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan
| | - Katsuyuki Fukutani
- Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan
| | - Ayako Yajima
- Kawasaki Heavy Industries, Ltd., Hyogo, 673-8666, Japan
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41
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Munakata R, Takemura T, Tatsumi K, Moriyoshi E, Yanagihara K, Sugiyama A, Suzuki H, Seki H, Muranaka T, Kawano N, Yoshimatsu K, Kawahara N, Yamaura T, Grosjean J, Bourgaud F, Hehn A, Yazaki K. Isolation of Artemisia capillaris membrane-bound di-prenyltransferase for phenylpropanoids and redesign of artepillin C in yeast. Commun Biol 2019; 2:384. [PMID: 31646187 PMCID: PMC6802118 DOI: 10.1038/s42003-019-0630-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 09/24/2019] [Indexed: 11/08/2022] Open
Abstract
Plants produce various prenylated phenolic metabolites, including flavonoids, phloroglucinols, and coumarins, many of which have multiple prenyl moieties and display various biological activities. Prenylated phenylpropanes, such as artepillin C (3,5-diprenyl-p-coumaric acid), exhibit a broad range of pharmaceutical effects. To date, however, no prenyltransferases (PTs) involved in the biosynthesis of phenylpropanes and no plant enzymes that introduce multiple prenyl residues to native substrates with different regio-specificities have been identified. This study describes the isolation from Artemisia capillaris of a phenylpropane-specific PT gene, AcPT1, belonging to UbiA superfamily. This gene encodes a membrane-bound enzyme, which accepts p-coumaric acid as its specific substrate and transfers two prenyl residues stepwise to yield artepillin C. These findings provide novel insights into the molecular evolution of this gene family, contributing to the chemical diversification of plant specialized metabolites. These results also enabled the design of a yeast platform for the synthetic biology of artepillin C.
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Affiliation(s)
- Ryosuke Munakata
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto 611–0011 Japan
- Université de Lorraine, INRA, LAE, F54000 Nancy, France
| | - Tomoya Takemura
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto 611–0011 Japan
| | - Kanade Tatsumi
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto 611–0011 Japan
| | - Eiko Moriyoshi
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto 611–0011 Japan
| | - Koki Yanagihara
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto 611–0011 Japan
| | - Akifumi Sugiyama
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto 611–0011 Japan
| | - Hideyuki Suzuki
- Department of Research & Development, Kazusa DNA Research Institute, Kisarazu, 292-0818 Japan
| | - Hikaru Seki
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, 565-0871 Japan
| | - Toshiya Muranaka
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, 565-0871 Japan
| | - Noriaki Kawano
- Tsukuba Division, Research Center for Medicinal Plant Resources, National Institutes of Biomedical Innovation, Health and Nutrition, Tsukuba, 305-0843 Japan
| | - Kayo Yoshimatsu
- Tsukuba Division, Research Center for Medicinal Plant Resources, National Institutes of Biomedical Innovation, Health and Nutrition, Tsukuba, 305-0843 Japan
| | - Nobuo Kawahara
- Tsukuba Division, Research Center for Medicinal Plant Resources, National Institutes of Biomedical Innovation, Health and Nutrition, Tsukuba, 305-0843 Japan
| | - Takao Yamaura
- The Yamashina Botanical Research Institute, Nippon Shinyaku Co. Ltd., 39 Sakanotsuji-cho, Ohyake, Yamashina-ku Kyoto, 607-8182 Japan
| | | | - Frédéric Bourgaud
- Plant Advanced Technologies – PAT, 19 Avenue de la forêt de Haye, 54500 Vandoeuvre, France
| | - Alain Hehn
- Université de Lorraine, INRA, LAE, F54000 Nancy, France
| | - Kazufumi Yazaki
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto 611–0011 Japan
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42
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Kobayashi Y, Cordonier CEJ, Noda Y, Nagase F, Enomoto J, Kageyama T, Honma H, Maruo S, Fukuda J. Tailored cell sheet engineering using microstereolithography and electrochemical cell transfer. Sci Rep 2019; 9:10415. [PMID: 31320678 PMCID: PMC6639316 DOI: 10.1038/s41598-019-46801-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 07/07/2019] [Indexed: 02/07/2023] Open
Abstract
Postoperative adhesion and occlusion remain a serious issue associated with various surgeries, including endoscopic surgery, in which proliferated fibrous tissues stick to adjacent tissues and often cause severe complications. Cell sheet engineering has emerged as an effective approach not only for cell transplantation but also for the treatment of postoperative adhesion and occlusion. However, as the tissues in the body, such as middle ear and small intestine, and typical operative sites are non-flat and spatially complicated, tailored cell sheets with three-dimensional (3D) configurations may lead to widespread use of this approach. In the present study, we used microstereolithography, biocompatible gold plating, and electrochemical cell detachment to achieve this purpose. Various objects with dimensions ranging from millimeter- to micrometer-scale were fabricated with photocurable resin using lab-made equipment for microstereolithography. To coat the fabricated objects with a thin gold layer, conventional cyanide-based gold plating was unusable because it severely damaged almost all cells. Electroless non-cyanide gold plating we prepared was cytocompatible and suitable for electrochemical cell detachment. Cell sheets on the gold-plated substrate could be directly transplanted into a mouse intraperitoneally using electrochemical cell detachment. We further demonstrated that cell sheets grown on gold-coated 3D objects were rapidly detached along with the desorption of electroactive-oligopeptide monolayer and transferred to a surrounding hydrogel. This approach may provide a promising strategy to prepare and directly transplant tailor-made cell sheets with suitable configurations.
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Affiliation(s)
- Yuka Kobayashi
- Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | | | - Yohei Noda
- Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Fuminori Nagase
- Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Junko Enomoto
- Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Tatsuto Kageyama
- Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Hideo Honma
- Faculty of Engineering, Kanto Gakuin University, 1162-2 Ogikubo, Odawara, 250-0022, Japan
| | - Shoji Maruo
- Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Junji Fukuda
- Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan.
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43
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Setogawa T, Mizuhiki T, Matsumoto N, Akizawa F, Kuboki R, Richmond BJ, Shidara M. Neurons in the monkey orbitofrontal cortex mediate reward value computation and decision-making. Commun Biol 2019; 2:126. [PMID: 30963114 PMCID: PMC6451015 DOI: 10.1038/s42003-019-0363-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 03/01/2019] [Indexed: 11/28/2022] Open
Abstract
Choice reflects the values of available alternatives; more valuable options are chosen more often than less valuable ones. Here we studied whether neuronal responses in orbitofrontal cortex (OFC) reflect the value difference between options, and whether there is a causal link between OFC neuronal activity and choice. Using a decision-making task where two visual stimuli were presented sequentially, each signifying a value, we showed that when the second stimulus appears many neurons encode the value difference between alternatives. Later when the choice occurs, that difference signal disappears and a signal indicating the chosen value emerges. Pharmacological inactivation of OFC neurons coding for choice-related values increases the monkey's latency to make a choice and the likelihood that it will choose the less valuable alternative, when the value difference is small. Thus, OFC neurons code for value information that could be used to directly influence choice.
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Affiliation(s)
- Tsuyoshi Setogawa
- Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan
- Department of Health and Human Services, Laboratory of Neuropsychology, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892-4415 USA
| | - Takashi Mizuhiki
- Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan
- Doctoral Program in Kansei, Behavioral and Brain Science, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan
| | - Narihisa Matsumoto
- Human Informatics Research Institute, AIST, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 Japan
| | - Fumika Akizawa
- Doctoral Program in Kansei, Behavioral and Brain Science, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan
| | - Ryosuke Kuboki
- Doctoral Program in Kansei, Behavioral and Brain Science, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan
| | - Barry J. Richmond
- Department of Health and Human Services, Laboratory of Neuropsychology, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892-4415 USA
| | - Munetaka Shidara
- Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan
- Doctoral Program in Kansei, Behavioral and Brain Science, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 Japan
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44
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Sakihama Y, Hidese R, Hasunuma T, Kondo A. Increased flux in acetyl-CoA synthetic pathway and TCA cycle of Kluyveromyces marxianus under respiratory conditions. Sci Rep 2019; 9:5319. [PMID: 30926897 PMCID: PMC6440987 DOI: 10.1038/s41598-019-41863-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 03/14/2019] [Indexed: 11/10/2022] Open
Abstract
Yeasts are extremely useful, not only for fermentation but also for a wide spectrum of fuel and chemical productions. We analyzed the overall metabolic turnover and transcript dynamics in glycolysis and the TCA cycle, revealing the difference in adaptive pyruvate metabolic response between a Crabtree-negative species, Kluyveromyces marxianus, and a Crabtree-positive species, Saccharomyces cerevisiae, during aerobic growth. Pyruvate metabolism was inclined toward ethanol production under aerobic conditions in S. cerevisiae, while increased transcript abundances of the genes involved in ethanol metabolism and those encoding pyruvate dehydrogenase were seen in K. marxianus, indicating the augmentation of acetyl-CoA synthesis. Furthermore, different metabolic turnover in the TCA cycle was observed in the two species: malate and fumarate production in S. cerevisiae was higher than in K. marxianus, irrespective of aeration; however, fluxes of both the reductive and oxidative TCA cycles were enhanced in K. marxianus by aeration, implying both the cycles contribute to efficient electron flux without producing ethanol. Additionally, decreased hexokinase activity under aerobic conditions is expected to be important for maintenance of suitable carbon flux. These findings demonstrate differences in the key metabolic trait of yeasts employing respiration or fermentation, and provide important insight into the metabolic engineering of yeasts.
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Affiliation(s)
- Yuri Sakihama
- Graduate School of Innovation, Science and Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
| | - Ryota Hidese
- Graduate School of Innovation, Science and Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
| | - Tomohisa Hasunuma
- Graduate School of Innovation, Science and Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan.
| | - Akihiko Kondo
- Graduate School of Innovation, Science and Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan.
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro, Tsurumi, Yokohama, Kanagawa, 230-0045, Japan.
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45
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Abstract
Since the emergence of programmable RNA-guided nucleases based on clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein (Cas) systems, genome editing technologies have become a simplified and versatile tool for genome editing in various organisms and cell types. Although genome editing enables efficient genome manipulations, such as gene disruptions, gene knockins, and chromosomal translocations via DNA double-strand break (DSB) repair in eukaryotes, DSBs induced by the CRISPR/Cas system are lethal or severely toxic to many microorganisms. Therefore, in many prokaryotes, including industrially useful microbes, the CRISPR/Cas system is often used as a negative selection component in combination with recombineering or other related strategies. Novel and revolutionary technologies have been recently developed to re-write targeted nucleotides (C:G to T:A and A:T to G:C) without DSBs and donor DNA templates. These technologies rely on the recruitment of deaminases at specific target loci using the nuclease-deficient CRISPR/Cas system. Here, the authors review and compare CRISPR-based genome editing, current base editing platforms and their spectra. The authors discuss how these technologies can be applied in various aspects of microbial metabolic engineering to overcome barriers to cellular regulation in prokaryotes.
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Affiliation(s)
- Takayuki Arazoe
- Department of Applied Biological Science, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan
| | - Akihiko Kondo
- Graduate School of Science, Technology and Innovation, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan
| | - Keiji Nishida
- Graduate School of Science, Technology and Innovation, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan
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46
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Ohnishi I, Hashimoto K, Tajima K. Synthesis of diketopyrrolopyrrole-based polymers with polydimethylsiloxane side chains and their application in organic field-effect transistors. R Soc Open Sci 2018; 5:172025. [PMID: 29657801 PMCID: PMC5882725 DOI: 10.1098/rsos.172025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 02/09/2018] [Indexed: 06/08/2023]
Abstract
Linear polydimethylsiloxane (PDMS) was investigated as a solubilizing group for π-conjugated polymers with the aim of combining high solubility in organic solvents with the molecular packing in solid films that is advantageous for charge transport. Diketopyrrolopyrrole-based copolymers with different contents and substitution patterns of the PDMS side chains were synthesized and evaluated for application in organic field-effect transistors. The PDMS side chains greatly increased the solubility of the polymers and led to shorter d-spacings of the π-stacking in the thin films compared with polymers containing conventional branched alkyl side chains.
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Affiliation(s)
- Inori Ohnishi
- RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako 351-0198, Japan
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kazuhito Hashimoto
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Keisuke Tajima
- RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako 351-0198, Japan
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