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Harada K, Masumoto K, Okada S. Between- and Within-Couple Concordance for Health Behaviors Among Japanese Older Married Couples: Examining the Moderating Role of Working Time. Int J Behav Med 2024; 31:215-228. [PMID: 36991277 DOI: 10.1007/s12529-023-10174-1] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2023] [Indexed: 03/31/2023]
Abstract
BACKGROUND Although previous studies report spousal concordance for health behaviors at between-couple levels, concordance at within-couple levels remains unconfirmed. To clarify the behavioral mechanisms of spousal concordance for health behaviors among older couples at both levels, it is necessary to examine the moderators (effect modifiers) of spousal concordance. This study examined (1) whether spousal concordance for dietary variety, exercise behavior, and TV viewing behavior was observed at both the between-couple and the within-couple levels and (2) whether this spousal concordance was moderated by working time among older Japanese couples. METHOD This study analyzed data obtained from a questionnaire-based, three-wave longitudinal survey (baseline, 1-year follow-up, 3-year follow-up) among 210 Japanese older couples. Each spouse's dietary variety, exercise time, TV viewing time, the couple's working time, and demographic factors were investigated by multi-level analyses. RESULTS One spouse's dietary variety and TV viewing time, but not exercise time, were significantly associated with the other spouse's corresponding behaviors at both levels. The regressions of the wife's TV viewing time on the husband's TV viewing time were moderated by working time at the within-couple level; the regressive effects of wife's TV viewing time on husband's TV viewing time were more relevant as working time was lower. CONCLUSION This study found that spousal concordance for dietary variety and TV viewing was observed at within-couple and between-couple levels among older Japanese couples. In addition, shorter working time partly moderates the wife's influence on the husband's TV viewing among older couples at the within-couple level.
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Affiliation(s)
- Kazuhiro Harada
- Active Aging Research Hub, Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe, 657-8501, Japan.
| | - Kouhei Masumoto
- Active Aging Research Hub, Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe, 657-8501, Japan
| | - Shuichi Okada
- Active Aging Research Hub, Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe, 657-8501, Japan
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2
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Miyajima Y, Aoyagi T, Yoshioka H, Hori T, Takahashi HA, Tanaka M, Tsukasaki A, Goto S, Suzumura M. Impact of Concurrent aerobic-anaerobic Methanotrophy on Methane Emission from Marine Sediments in Gas Hydrate Area. Environ Sci Technol 2024; 58:4979-4988. [PMID: 38445630 PMCID: PMC10956523 DOI: 10.1021/acs.est.3c09484] [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] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 02/13/2024] [Accepted: 02/14/2024] [Indexed: 03/07/2024]
Abstract
Microbial methane oxidation has a significant impact on the methane flux from marine gas hydrate areas. However, the environmental fate of methane remains poorly constrained. We quantified the relative contributions of aerobic and anaerobic methanotrophs to methane consumption in sediments of the gas hydrate-bearing Sakata Knoll, Japan, by in situ geochemical and microbiological analyses coupled with 13C-tracer incubation experiments. The anaerobic ANME-1 and ANME-2 species contributed to the oxidation of 33.2 and 1.4% methane fluxes at 0-10 and 10-22 cm below the seafloor (bsf), respectively. Although the aerobic Methylococcaceae species consumed only 0.9% methane flux in the oxygen depleted 0.0-0.5 cmbsf zone, their metabolic activity was sustained down to 6 cmbsf (based on rRNA and lipid biosyntheses), increasing their contribution to 10.3%. Our study emphasizes that the co-occurrence of aerobic and anaerobic methanotrophy at the redox transition zone is an important determinant of methane flux.
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Affiliation(s)
- Yusuke Miyajima
- Research
Institute for Geo-Resources and Environment, Geological Survey of
Japan, National Institute of Advanced Industrial
Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
| | - Tomo Aoyagi
- Environmental
Management Research Institute, National
Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
| | - Hideyoshi Yoshioka
- Research
Institute for Geo-Resources and Environment, Geological Survey of
Japan, National Institute of Advanced Industrial
Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
| | - Tomoyuki Hori
- Environmental
Management Research Institute, National
Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
| | - Hiroshi A. Takahashi
- Research
Institute of Earthquake and Volcano Geology, Geological Survey of
Japan, National Institute of Advanced Industrial
Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
| | - Minako Tanaka
- KANSO
TECHNOS Co., Ltd., 14 Kanda Higashimatsushita-cho, Chiyoda-ku, Tokyo 101-0042, Japan
| | - Ayumi Tsukasaki
- Environmental
Management Research Institute, National
Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
| | - Shusaku Goto
- Research
Institute for Geo-Resources and Environment, Geological Survey of
Japan, National Institute of Advanced Industrial
Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
| | - Masahiro Suzumura
- Environmental
Management Research Institute, National
Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
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Harada K, Masumoto K, Okada S. Physical Activity Components that Determine Daily Life Satisfaction Among Older Adults: An Intensive Longitudinal Diary Study. Int J Behav Med 2024:10.1007/s12529-024-10273-7. [PMID: 38504040 DOI: 10.1007/s12529-024-10273-7] [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] [Accepted: 02/23/2024] [Indexed: 03/21/2024]
Abstract
BACKGROUND Although previous studies have shown that engaging in physical activity can elevate daily life satisfaction, few studies have identified the specific aspects that can result in this. This study examined whether enjoying moderate-to-vigorous intensity exercises with others for a longer time, but not any aspects of non-exercise physical activity, was associated with higher daily life satisfaction among older adults. METHOD We conducted an intensive longitudinal diary survey of 182 individuals for 1 week and obtained valid data for 853 person-days. The time spent engaging in light and moderate-to-vigorous physical activity at 8:00-11:59, 12:00-15:59, and 16:00-19:59 h was measured using an accelerometer. Duration, intensity, timing, social context, and enjoyment of the exercises were assessed based on diary entries. Stratified by non-exercise and exercise days, we conducted multilevel models. RESULTS On non-exercise days, longer duration of light physical activity from 12:00 to 15:59 at the within-person level was associated with higher daily life satisfaction. On exercise days, longer duration of moderate-to-vigorous physical activity from 12:00 to 15:59 at the within-person level, longer exercise duration at the within-person level, exercising with moderate-to-vigorous intensity, and enjoyment of exercise at both the within- and between-person levels were associated with higher daily life satisfaction. CONCLUSION These findings indicate that enjoying moderate-to-vigorous intensity exercise for a longer duration than usual and engaging in non-exercise physical activity in the afternoon are important for elevating older adults' daily life satisfaction.
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Affiliation(s)
- Kazuhiro Harada
- Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe, 657-8501, Japan.
- Advanced Research Center for Well-Being, Kobe University, 3-11 Tsurukabuto, Nada, Kobe, 657-8501, Japan.
- Institute for Advanced Research, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan.
| | - Kouhei Masumoto
- Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe, 657-8501, Japan
- Advanced Research Center for Well-Being, Kobe University, 3-11 Tsurukabuto, Nada, Kobe, 657-8501, Japan
| | - Shuichi Okada
- Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe, 657-8501, Japan
- Hyogo Study Center, The Open University of Japan, Chiba, Japan
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Tsutsui K, Ukita S, Kondo M, Toshima G, Miyazaki N, Nagashima K, Ohmura M, Tsuchihashi S, Tsuji Y, Katoh M, Aida N, Kobayashi Y, Ohtsu Y, Fujita Y, Tanaka S, Watanabe H, Naruse Y, Iizuka I, Kato H, Mashimo Y, Senbonmatsu T. Synergistic Effect of Motivation for the Elderly and Support for Going Out II: Measures to Induce Elderly Men to Go Out. Geriatrics (Basel) 2024; 9:21. [PMID: 38392108 DOI: 10.3390/geriatrics9010021] [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: 12/20/2023] [Revised: 01/31/2024] [Accepted: 02/09/2024] [Indexed: 02/24/2024] Open
Abstract
BACKGROUND The second demonstration experiment of supporting elderly people going out with the Choisoko system was conducted. The first study showed that for women, friends, shopping, convenience, and events are factors that have the potential to be effective motivational factors for encouraging these women to go out. On the other hand, these factors did not lead to any behavioral change in men. Since there are approximately 15 million men over the age of 65 in Japan, behavioral changes in the entire elderly population will not occur without guidance for elderly men to go out. METHODS Sixteen elderly men and forty-seven elderly women participated. Interestingly, men are far more passionate about games than women. Therefore, we hypothesized that a preference for games could be a hint as to how we might encourage older men to go out. Then, a second demonstration experiment was conducted, and we analyzed the relationship between six game preferences and the frequency of going out. RESULTS Among gaming preferences, men with gaming preferences such as Philanthropists, Achievers, and Free Spirits showed a tendency to go out. CONCLUSIONS These stimuli may have the potential to be factors that may encourage elderly men to go out.
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Affiliation(s)
- Kenta Tsutsui
- Department of Cardiology, International Medical Center, Saitama Medical University, Saitama 350-1298, Japan
| | - Shoko Ukita
- Biostatistics Unit, Clinical and Translational Research Center, Keio University Hospital, Tokyo 160-8582, Japan
| | - Masahiro Kondo
- Biostatistics Unit, Clinical and Translational Research Center, Keio University Hospital, Tokyo 160-8582, Japan
| | - Genta Toshima
- Biostatistics Unit, Clinical and Translational Research Center, Keio University Hospital, Tokyo 160-8582, Japan
| | - Naoki Miyazaki
- Biostatistics Unit, Clinical and Translational Research Center, Keio University Hospital, Tokyo 160-8582, Japan
| | - Kengo Nagashima
- Biostatistics Unit, Clinical and Translational Research Center, Keio University Hospital, Tokyo 160-8582, Japan
| | - Mitsuyo Ohmura
- Department of Innovative Biomarker Development, Institute for Advanced Medical Sciences, Nippon Medical School, Tokyo 113-0031, Japan
| | - Saki Tsuchihashi
- Department of Radiology, Saitama Medical University, Saitama 350-0495, Japan
| | - Yoshitaka Tsuji
- Division of General Education, Faculty of Health and Medical Care, Department of General Surgery, Saitama Medical University, Saitama 350-1241, Japan
| | - Makoto Katoh
- Research Administration Center, Saitama Medical University, Saitama 350-0495, Japan
| | - Naomi Aida
- Kobayashi Hospital, Saitama 358-0014, Japan
| | | | - Yui Ohtsu
- Graduate School of Humanities and Social Sciences, Saitama University, Saitama 338-8570, Japan
| | - Yoshihiro Fujita
- Mobility Service Department, Koga Software Company, Tokyo 110-0005, Japan
| | - Shukichi Tanaka
- Advanced ICT Research Institute, National Institute of Information and Communications Technology, Hyogo 651-2492, Japan
| | - Hiroki Watanabe
- Center for Information and Neural Networks, National Institute of Information and Communications Technology, Osaka University, Kobe 651-2492, Japan
| | - Yasushi Naruse
- Center for Information and Neural Networks, National Institute of Information and Communications Technology, Osaka University, Kobe 651-2492, Japan
| | - Isao Iizuka
- Business Promotion Department Aisin Co., Ltd., Kariya 448-8650, Japan
| | - Hiromi Kato
- Business Promotion Department Aisin Co., Ltd., Kariya 448-8650, Japan
| | - Yumi Mashimo
- Department of Community Medicine, International Medical Center, Saitama Medical University, Saitama 350-1298, Japan
| | - Takaaki Senbonmatsu
- Department of Cardiology, International Medical Center, Saitama Medical University, Saitama 350-1298, Japan
- Research Administration Center, Saitama Medical University, Saitama 350-0495, Japan
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Ohue-Kitano R, Masujima Y, Nishikawa S, Iwasa M, Nishitani Y, Kawakami H, Kuwahara H, Kimura I. 3-(4-Hydroxy-3-methoxyphenyl) propionic acid contributes to improved hepatic lipid metabolism via GPR41. Sci Rep 2023; 13:21246. [PMID: 38040866 PMCID: PMC10692101 DOI: 10.1038/s41598-023-48525-3] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 11/27/2023] [Indexed: 12/03/2023] Open
Abstract
3-(4-hydroxy-3-methoxyphenyl) propionic acid (HMPA) is a metabolite produced by the gut microbiota through the conversion of 4-hydroxy-3-methoxycinnamic acid (HMCA), which is a widely distributed hydroxycinnamic acid-derived metabolite found abundantly in plants. Several beneficial effects of HMPA have been suggested, such as antidiabetic properties, anticancer activities, and cognitive function improvement, in animal models and human studies. However, the intricate molecular mechanisms underlying the bioaccessibility and bioavailability profile following HMPA intake and the substantial modulation of metabolic homeostasis by HMPA require further elucidation. In this study, we effectively identified and characterized HMPA-specific GPR41 receptor, with greater affinity than HMCA. The activation of this receptor plays a crucial role in the anti-obesity effects and improvement of hepatic steatosis by stimulating the lipid catabolism pathway. For the improvement of metabolic disorders, our results provide insights into the development of functional foods, including HMPA, and preventive pharmaceuticals targeting GPR41.
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Affiliation(s)
- Ryuji Ohue-Kitano
- Laboratory of Molecular Neurobiology, Graduate School of Biostudies, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan.
- Laboratory of Molecular Endocrinology, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan.
- Center for Living Systems Information Science (CeLiSIS), Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan.
| | - Yuki Masujima
- Laboratory of Molecular Neurobiology, Graduate School of Biostudies, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Shota Nishikawa
- Laboratory of Molecular Endocrinology, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Masayo Iwasa
- Laboratory of Molecular Neurobiology, Graduate School of Biostudies, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Yosuke Nishitani
- Research Center, Maruzen Pharmaceuticals Co., Ltd., Fukuyama, Hiroshima, 729-3102, Japan
| | - Hideaki Kawakami
- Research Center, Maruzen Pharmaceuticals Co., Ltd., Fukuyama, Hiroshima, 729-3102, Japan
| | - Hiroshige Kuwahara
- Research Center, Maruzen Pharmaceuticals Co., Ltd., Fukuyama, Hiroshima, 729-3102, Japan
| | - Ikuo Kimura
- Laboratory of Molecular Neurobiology, Graduate School of Biostudies, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan.
- Laboratory of Molecular Endocrinology, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan.
- Department of Applied Biological Science, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan.
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Kawai H, Ejiri M, Ito K, Fujiwara Y, Ihara K, Hirano H, Sasai H, Kim H, Obuchi S. Social interaction trajectories and all-cause mortality in older adults: the Otassha study. Front Public Health 2023; 11:1248462. [PMID: 37674679 PMCID: PMC10477580 DOI: 10.3389/fpubh.2023.1248462] [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: 06/27/2023] [Accepted: 08/09/2023] [Indexed: 09/08/2023] Open
Abstract
Introduction This longitudinal study aimed to identify aging trajectory patterns of social interaction by sex and determine the association between these patterns and all-cause mortality. Methods Participants were 4,065 community-dwelling older adults (1849 men) in Japan, aged 65-89 years, who responded twice or more to a mail survey conducted between 2012 and 2020. Social interaction was examined through the frequency of face-to-face and non-face-to-face contact with non-resident family and friends. The aging trajectories of the social interaction scores were identified using group-based trajectory modeling. Results Two groups were identified among both men and women. Among men with high-frequency interaction, a rapid decrease in the frequency of social interaction was observed after 80 years of age. Conversely, among women, the frequency tended to remain the same, even after 80 years of age. The social interaction score among those aged 65 years in the low-frequency group was approximately 4 points for men and 6 points for women. Among men, no decrease was observed; however, it tended to decline after 85 years of age among women. Among men, the factors associated with the low-frequency group were instrumental activities of daily living score, perceived financial status, and social participation, while among women, they were self-rated health and social participation. The adjusted hazard ratio in the low-frequency group for all-cause mortality was 1.72 (95% confidence interval, 1.27-1.72) for men and 1.45 (95% confidence interval, 0.98-2.14) for women. Discussion In the low-frequency group, men had a higher risk of all-cause mortality than women. Daily social interaction from mid-age is important to reduce the risk of social isolation and all-cause mortality in later life.
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Affiliation(s)
- Hisashi Kawai
- Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan
| | - Manami Ejiri
- Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan
| | - Kumiko Ito
- Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan
| | - Yoshinori Fujiwara
- Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan
| | | | - Hirohiko Hirano
- Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan
| | - Hiroyuki Sasai
- Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan
| | - Hunkyung Kim
- Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan
| | - Shuichi Obuchi
- Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan
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Oba Y, Motokawa R, Kaneko K, Nagai T, Tsuchikawa Y, Shinohara T, Parker JD, Okamoto Y. Neutron resonance absorption imaging of simulated high-level radioactive waste in borosilicate glass. Sci Rep 2023; 13:10071. [PMID: 37344550 DOI: 10.1038/s41598-023-37157-2] [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: 03/03/2023] [Accepted: 06/16/2023] [Indexed: 06/23/2023] Open
Abstract
We performed a preliminary study of neutron resonance absorption imaging to investigate the spatial distribution of constituent elements in borosilicate glasses containing simulated high-level radioactive waste, in which elemental inhomogeneities affect the physical and chemical stabilities of the glass. Dips generated by the resonance absorptions of Rh, Pd, Na, Gd, Cs, and Sm were observed in the neutron transmission spectra of the glass samples. The spatial distributions of these elements were obtained from the neutron transmission images at the resonance energies. The distributions of Rh and Pd visualized the sedimentation of these platinum group elements. In contrast, the lanthanides (Gd and Sm) and Cs were uniformly dispersed. These results show that neutron resonance absorption imaging is a promising tool for characterizing borosilicate glasses and investigating the vitrification mechanism of high-level radioactive waste.
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Affiliation(s)
- Y Oba
- Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan.
- Department of Mechanical Engineering, Toyohashi University of Technology, Toyohashi, 441-8580, Japan.
| | - R Motokawa
- Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
| | - K Kaneko
- Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
| | - T Nagai
- TRP Decommissioning Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1194, Japan
| | - Y Tsuchikawa
- J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
| | - T Shinohara
- J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
| | - J D Parker
- Neutron R&D Division, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki, 319-1106, Japan
| | - Y Okamoto
- Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
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Oshita S, Boerzhijin S, Kameya H, Yoshimura M, Sotome I. Promotion Effects of Ultrafine Bubbles/Nanobubbles on Seed Germination. Nanomaterials (Basel) 2023; 13:nano13101677. [PMID: 37242093 DOI: 10.3390/nano13101677] [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: 04/16/2023] [Revised: 05/17/2023] [Accepted: 05/17/2023] [Indexed: 05/28/2023]
Abstract
The number concentrations of air UFBs were controlled, approximately, by adjusting the generation time. UFB waters, ranging from 1.4 × 108 mL-1 to 1.0 × 109 mL-1, were prepared. Barley seeds were submerged in beakers filled with distilled water and UFB water in a ratio of 10 mL of water per seed. The experimental observations of seed germination clarified the role of UFB number concentrations; that is, a higher number concentration induced earlier seed germination. In addition, excessively high UFB number concentrations caused suppression of seed germination. A possible reason for the positive or negative effects of UFBs on seed germination could be ROS generation (hydroxyl radicals and ∙OH, OH radicals) in UFB water. This was supported by the detection of ESR spectra of the CYPMPO-OH adduct in O2 UFB water. However, the question still remains: how can OH radicals be generated in O2 UFB water?
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Affiliation(s)
- Seiichi Oshita
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Surina Boerzhijin
- National Research Institute of Brewing, 3-7-1 Kagamiyama, Higashihiroshima 739-0046, Japan
| | - Hiromi Kameya
- Institute of Food Research, National Agriculture and Food Research Organization (NARO), Kan-nondai, Tsukuba 305-8642, Japan
| | - Masatoshi Yoshimura
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Itaru Sotome
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
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9
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Iizuka T, Kawamorita T, Tsuji H, Kanai H, Hirai T, Suzuki H, Handa T, Ishikawa H. High visibility colored fabrics for normal trichromats and individuals with color vision defects in a sunset-simulated environment. PLoS One 2022; 17:e0274824. [PMID: 36112725 PMCID: PMC9480988 DOI: 10.1371/journal.pone.0274824] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 02/09/2022] [Accepted: 09/06/2022] [Indexed: 11/29/2022] Open
Abstract
This study aimed to investigate the visibility of colors in congenitally color vision defect people using general and fluorescent colors in an environment simulating sunset to examine the standards for high-visibility safety clothing for general users. Twenty participants with normal trichromats, seven protanopes, and five deuteranopes were included, with mean ages (± standard deviation) of 21.0±1.0, 46,7±16.1, and 56.6±6.9 years, respectively. Dyed fabrics were used to evaluate visibility. We evaluated brightness and conspicuousness sensitivity by combining red, yellow-red, yellow, green, red-purple, blue, white, black, fluorescent yellow, and fluorescent orange. For brightness sensitivity, the combination of fluorescent yellow and white/yellow stripes was highly visible and significantly different from all other samples (p < 0.05). For conspicuousness sensitivity, the combinations of black/fluorescent yellow, black/yellow, black/white, black/yellow-red, and white/red-purple stripes were highly visible and significantly different from all the other samples (p < 0.05). Yellow light is most visible and even better when fluorescent. They are based on specific spectral sensitivity, and yellow is the most visible, even for congenitally colorblind individuals. Furthermore, with regard to color combinations, it was found that the contrast between two distinct light or dark colors, such as black, yellow, black, and white, is perceived to be equally noticeable by congenital color vision defect individuals. This suggests the possible further applications of safety clothing.
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Affiliation(s)
- Tatsuya Iizuka
- Department of Vision Science, Kitasato University Graduate School of Medical Sciences, Kanagawa, Japan
- * E-mail:
| | - Takushi Kawamorita
- Department of Vision Science, Kitasato University Graduate School of Medical Sciences, Kanagawa, Japan
- Department of Orthoptics and Visual Science, Kitasato University School of Allied Health Sciences, Kanagawa, Japan
| | | | - Hiroyuki Kanai
- Faculty of Textile Science and Technology, Shinshu University, Nagano, Japan
| | - Toshihiro Hirai
- Faculty of Textile Science and Technology, Shinshu University, Nagano, Japan
| | | | - Tomoya Handa
- Department of Vision Science, Kitasato University Graduate School of Medical Sciences, Kanagawa, Japan
- Department of Orthoptics and Visual Science, Kitasato University School of Allied Health Sciences, Kanagawa, Japan
| | - Hitoshi Ishikawa
- Department of Vision Science, Kitasato University Graduate School of Medical Sciences, Kanagawa, Japan
- Department of Orthoptics and Visual Science, Kitasato University School of Allied Health Sciences, Kanagawa, Japan
- Department of Ophthalmology, Kitasato University School of Medicine, Kanagawa, Japan
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10
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Yang X, Li M, Maeno A, Yanase T, Yokokura S, Nagahama T, Shimada T. Growth of Pentacene Crystals by Naphthalene Flux Method. ACS Omega 2022; 7:28618-28623. [PMID: 35990455 PMCID: PMC9386793 DOI: 10.1021/acsomega.2c03551] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 07/22/2022] [Indexed: 06/15/2023]
Abstract
We report the crystal growth of pentacene from a solution of naphthalene. The solubility of pentacene in naphthalene was evaluated by optical absorption at elevated temperature. The crystal growth was performed in an H-shaped sealed glass tube or metal vessels sealed with ultrahigh-vacuum compatible flanges placed in heated two-zone aluminum blocks. The obtained crystals had a single-crystal-like appearance and flat surface. They were made of aligned microtwins of the "bulk type" (interlayer spacing 14.5 Å) polymorph.
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Lee JH, Shibata S, Goto E. Time-Course of Changes in Photosynthesis and Secondary Metabolites in Canola ( Brassica napus) Under Different UV-B Irradiation Levels in a Plant Factory With Artificial Light. Front Plant Sci 2021; 12:786555. [PMID: 35003173 PMCID: PMC8730333 DOI: 10.3389/fpls.2021.786555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 09/30/2021] [Accepted: 11/08/2021] [Indexed: 06/14/2023]
Abstract
This study aimed to evaluate short-duration (24 h) UV-B irradiation as a preharvest abiotic stressor in canola plants. Moreover, we quantified the expression levels of genes related to bioactive compounds synthesis in response to UV-B radiation. Canola seedlings were cultivated in a plant factory under artificial light (200 μmol m-2 s-1 photosynthetic photon flux density; white LED lamps; 16 h on/8 h off), 25°C/20°C daytime/nighttime air temperature, and 70% relative humidity. Eighteen days after sowing, the seedlings were subjected to supplemental UV-B treatment. The control plants received no UV-B irradiation. The plants were exposed to 3, 5, or 7 W m-2 UV-B irradiation. There were no significant differences in shoot fresh weight between the UV-B-irradiated and control plants. With increasing UV-B irradiation intensity and exposure time, the H2O2 content gradually increased, the expression levels of genes related to photosynthesis downregulated, and phenylpropanoid and flavonoid production, and also total phenolic, flavonoid, antioxidant, and anthocyanin concentrations were significantly enhanced. The genes related to secondary metabolite biosynthesis were immediately upregulated after UV-B irradiation. The relative gene expression patterns identified using qRT-PCR corroborated the variations in gene expression that were revealed using microarray analysis. The time point at which the genes were induced varied with the gene location along the biosynthetic pathway. To the best of our knowledge, this is the first study to demonstrate a temporal difference between the accumulation of antioxidants and the induction of genes related to the synthesis of this compound in UV-B-treated canola plants. Our results demonstrated that short-term UV-B irradiation could augment antioxidant biosynthesis in canola without sacrificing crop yield or quality.
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Affiliation(s)
- Jin-Hui Lee
- Graduate School of Horticulture, Chiba University, Matsudo, Japan
| | - Seina Shibata
- Graduate School of Horticulture, Chiba University, Matsudo, Japan
| | - Eiji Goto
- Graduate School of Horticulture, Chiba University, Matsudo, Japan
- Plant Molecular Research Center, Chiba University, Chiba, Japan
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Matsuzaka Y, Totoki S, Handa K, Shiota T, Kurosaki K, Uesawa Y. Prediction Models for Agonists and Antagonists of Molecular Initiation Events for Toxicity Pathways Using an Improved Deep-Learning-Based Quantitative Structure-Activity Relationship System. Int J Mol Sci 2021; 22:10821. [PMID: 34639159 PMCID: PMC8509615 DOI: 10.3390/ijms221910821] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 08/29/2021] [Revised: 09/29/2021] [Accepted: 10/04/2021] [Indexed: 12/11/2022] Open
Abstract
In silico approaches have been studied intensively to assess the toxicological risk of various chemical compounds as alternatives to traditional in vivo animal tests. Among these approaches, quantitative structure-activity relationship (QSAR) analysis has the advantages that it is able to construct models to predict the biological properties of chemicals based on structural information. Previously, we reported a deep learning (DL) algorithm-based QSAR approach called DeepSnap-DL for high-performance prediction modeling of the agonist and antagonist activity of key molecules in molecular initiating events in toxicological pathways using optimized hyperparameters. In the present study, to achieve high throughput in the DeepSnap-DL system-which consists of the preparation of three-dimensional molecular structures of chemical compounds, the generation of snapshot images from the three-dimensional chemical structures, DL, and statistical calculations-we propose an improved DeepSnap-DL approach. Using this improved system, we constructed 59 prediction models for the agonist and antagonist activity of key molecules in the Tox21 10K library. The results indicate that modeling of the agonist and antagonist activity with high prediction performance and high throughput can be achieved by optimizing suitable parameters in the improved DeepSnap-DL system.
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Affiliation(s)
- Yasunari Matsuzaka
- Department of Medical Molecular Informatics, Meiji Pharmaceutical University, Kiyose, Tokyo 204-8588, Japan; (Y.M.); (K.K.)
- Center for Gene and Cell Therapy, Division of Molecular and Medical Genetics, The Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo 108-8639, Japan
| | - Shin Totoki
- Fujitsu Limited, Kawasaki-shi, Kanagawa 211-8588, Japan; (S.T.); (K.H.); (T.S.)
| | - Kentaro Handa
- Fujitsu Limited, Kawasaki-shi, Kanagawa 211-8588, Japan; (S.T.); (K.H.); (T.S.)
| | - Tetsuyoshi Shiota
- Fujitsu Limited, Kawasaki-shi, Kanagawa 211-8588, Japan; (S.T.); (K.H.); (T.S.)
| | - Kota Kurosaki
- Department of Medical Molecular Informatics, Meiji Pharmaceutical University, Kiyose, Tokyo 204-8588, Japan; (Y.M.); (K.K.)
| | - Yoshihiro Uesawa
- Department of Medical Molecular Informatics, Meiji Pharmaceutical University, Kiyose, Tokyo 204-8588, Japan; (Y.M.); (K.K.)
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Yuguchi T, Izumino Y, Sasao E. Genesis and development processes of fractures in granite: Petrographic indicators of hydrothermal alteration. PLoS One 2021; 16:e0251198. [PMID: 33945584 PMCID: PMC8096112 DOI: 10.1371/journal.pone.0251198] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 04/21/2021] [Indexed: 11/19/2022] Open
Abstract
Biotites occur with varying degrees of alteration within a granite. This study analyzes the relationships among alteration indicators, areal microvoid fractions in chloritized biotite, and macroscopic fracture frequencies in the Toki granite, central Japan, to establish the genesis and development processes of fractures in granite. Appropriate characterizations for the frequency distribution of macroscopic fractures in granite can assist in understanding potential hydrogeological applications, which contributes to safety evaluations for geological disposal and storage. Borehole 06MI03, drilled to a depth of 191 m, was used to obtain samples for the analysis. In total, 24 samples that depicted variations in the macroscopic fracture frequency were selected. Petrographic alteration indicators using biotite chloritization as innovative methods are proposed to evaluate the extent of hydrothermal alteration and fracture frequency within granites. The alteration indicators are defined as the ratio between the alteration product area and the original mineral area. Furthermore, the volume of microscopic fractures and micropores in the mineral was quantitatively characterized by the areal fraction of microvoids in minerals through image analysis. Samples with high macroscopic fracture frequencies correspond to a high number of areal microvoid fractions and large alteration indicators. Microvoids, which are the source of macroscopic fractures, occurred at temperatures between 350 and 780°C and can be evaluated by intrinsic factors, such as alteration indicators. Subsequent faulting and unloading (extrinsic factors) developed microvoids into macroscopic fractures. Intrinsic factors are used to evaluate the source of macroscopic fractures, and therefore contribute to the characterization of present and future distributions of macroscopic fracture frequencies.
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Affiliation(s)
| | - Yuya Izumino
- Faculty of Science, Yamagata University, Yamagata, Japan
| | - Eiji Sasao
- Japan Atomic Energy Agency, Toki, Gifu, Japan
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Hamabata T, Sato T, Takita E, Matsui T, Imaoka T, Nakanishi N, Nakayama K, Tsukahara T, Sawada K. Shiga toxin 2eB-transgenic lettuce vaccine is effective in protecting weaned piglets from edema disease caused by Shiga toxin-producing Escherichia coli infection. Anim Sci J 2019; 90:1460-1467. [PMID: 31502390 DOI: 10.1111/asj.13292] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 02/15/2019] [Revised: 07/23/2019] [Accepted: 07/31/2019] [Indexed: 12/23/2022]
Abstract
Porcine edema disease (ED) is a toxemia that is caused by enteric infection with Shiga toxin 2e (Stx2e)-producing Escherichia coli (STEC) and is associated with high mortality. Since ED occurs most frequently during the weaning period, preweaning vaccination of newborn piglets is required. We developed stx2eB-transgenic lettuce as an oral vaccine candidate against ED and examined its protective efficacy using a piglet STEC infection model. Two serially developed Stx2eB-lettuce strains, 2BN containing ingredient Stx2eB constituting a concentration level of 0.53 mg Stx2eB/g of powdered lettuce dry weight (DW) and 2BH containing ingredient Stx2eB constituting a concentration level of 2.3 mg of Stx2eB/g of powdered lettuce DW, were evaluated in three sequential experiments. Taken the results together, oral administration of Stx2eB-lettuce vaccine was suggested to relieve the pathogenic symptoms of ED in piglets challenged with virulent STEC strain. Our data suggested that Stx2eB-lettuce is a promising first oral vaccine candidate against ED.
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Affiliation(s)
- Takashi Hamabata
- National Center for Global Health and Medicine, Research Institute, Tokyo, Japan
| | - Toshio Sato
- National Center for Global Health and Medicine, Research Institute, Tokyo, Japan
| | - Eiji Takita
- Advanced Technology Research Laboratories, Idemitsu Kosan Co. Ltd., Chiba, Japan
| | - Takeshi Matsui
- Advanced Technology Research Laboratories, Idemitsu Kosan Co. Ltd., Chiba, Japan
| | | | | | - Keizo Nakayama
- Kyoto Institute of Nutrition and Pathology, Ujitawara, Japan
| | | | - Kazutoshi Sawada
- Advanced Technology Research Laboratories, Idemitsu Kosan Co. Ltd., Chiba, Japan
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Sano Y, Takayasu H, Havlin S, Takayasu M. Identifying long-term periodic cycles and memories of collective emotion in online social media. PLoS One 2019; 14:e0213843. [PMID: 30897174 PMCID: PMC6428299 DOI: 10.1371/journal.pone.0213843] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [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: 08/23/2018] [Accepted: 03/03/2019] [Indexed: 11/18/2022] Open
Abstract
Collective emotion has been traditionally evaluated by questionnaire survey on a limited number of people. Recently, big data of written texts on the Internet has been available for analyzing collective emotion for very large scales. Although short-term reflection between collective emotion and real social phenomena has been widely studied, long-term dynamics of collective emotion has not been studied so far due to the lack of long persistent data sets. In this study, we extracted collective emotion over a 10-year period from 3.6 billion Japanese blog articles. Firstly, we find that collective emotion shows clear periodic cycles, i.e., weekly and seasonal behaviors, accompanied with pulses caused by natural disasters. For example, April is represented by high Tension, probably due to starting school in Japan. We also identified long-term memory in the collective emotion that is characterized by the power-law decay of the autocorrelation function over several months.
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Affiliation(s)
- Yukie Sano
- Department of Policy and Planning Sciences, University of Tsukuba, Ibaraki, Japan
| | - Hideki Takayasu
- Sony Computer Science Laboratories, Inc., Tokyo, Japan
- Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Japan
| | - Shlomo Havlin
- Department of Physics, Bar-Ilan University, Ramat-Gan, Israel
| | - Misako Takayasu
- Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Japan
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Kameyama A, Dissanayake SK, Thet Tin WW. Rapid chemical de-N-glycosylation and derivatization for liquid chromatography of immunoglobulin N-linked glycans. PLoS One 2018; 13:e0196800. [PMID: 29723274 PMCID: PMC5933716 DOI: 10.1371/journal.pone.0196800] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 01/09/2018] [Accepted: 04/19/2018] [Indexed: 11/19/2022] Open
Abstract
Glycan analysis may result in exploitation of glycan biomarkers and evaluation of heterogeneity of glycosylation of biopharmaceuticals. For N-linked glycan analysis, we investigated alkaline hydrolysis of the asparagine glycosyl carboxamide of glycoproteins as a deglycosylation reaction. By adding hydroxylamine into alkaline de-N-glycosylation, we suppressed the degradation of released glycans and obtained a mixture of oximes, free glycans, and glycosylamines. The reaction was completed within 1 h, and the mixture containing oximes was easily tagged with 2-aminobenzamide by reductive amination. Here, we demonstrated N-linked glycan analysis using this method for a monoclonal antibody, and examined whether this method could liberate glycans without degradation from apo-transferrin containing NeuAc and NeuGc and horseradish peroxidase containing Fuc α1-3 GlcNAc at the reducing end. Furthermore, we compared glycan recoveries between conventional enzymatic glycan release and this method. Increasing the reaction temperature and reaction duration led to degradation, whereas decreasing these parameters resulted in lower release. Considering this balance, we proposed to carry out the reaction at 80°C for 1 h for asialo glycoproteins from mammals and at 50°C for 1 h for sialoglycoproteins.
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Affiliation(s)
- Akihiko Kameyama
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan
- * E-mail:
| | - Santha Kumara Dissanayake
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan
| | - Wai Wai Thet Tin
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan
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Saegusa N, Sarukawa S, Ohta K, Takamatsu K, Watanabe M, Sugino T, Nakagawa M, Akiyama Y, Kusuhara M, Kishi K, Inoue K. Sutureless microvascular anastomosis assisted by an expandable shape-memory alloy stent. PLoS One 2017; 12:e0181520. [PMID: 28742116 PMCID: PMC5524395 DOI: 10.1371/journal.pone.0181520] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [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: 10/15/2016] [Accepted: 07/03/2017] [Indexed: 12/04/2022] Open
Abstract
Vascular anastomosis is the highlight of cardiovascular, transplant, and reconstructive surgery, which has long been performed by hand using a needle and suture. However, anastomotic thrombosis occurs in approximately 0.5-10% of cases, which can cause serious complications. To improve the surgical outcomes, attempts to develop devices for vascular anastomosis have been made, but they have had limitations in handling, cost, patency rate, and strength at the anastomotic site. Recently, indwelling metal stents have been greatly improved with precise laser metalwork through programming technology. In the present study, we designed a bare metal stent, Microstent, that was constructed by laser machining of a shape-memory alloy, NiTi. An end-to-end microvascular anastomosis was performed in SD rats by placing the Microstent at the anastomotic site and gluing the junction. The operation time for the anastomosis was significantly shortened using Microstent. Thrombus formation, patency rate, and blood vessel strength in the Microstent anastomosis were superior or comparable to hand-sewn anastomosis. The results demonstrated the safety and effectiveness, as well as the operability, of the new method, suggesting its great benefit for surgeons by simplifying the technique for microvascular anastomosis.
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Affiliation(s)
- Noriko Saegusa
- Division of Plastic and Reconstructive Surgery, Shizuoka Cancer Center, Shizuoka, Japan
- Department of Plastic Surgery, School of Medicine, Keio University, Tokyo, Japan
| | - Shunji Sarukawa
- Department of Plastic and Reconstructive Surgery, School of Medicine, Jichi Medical University, Tochigi, Japan
| | | | | | | | - Takashi Sugino
- Division of Pathology, Shizuoka Cancer Center, Shizuoka, Japan
| | - Masahiro Nakagawa
- Division of Plastic and Reconstructive Surgery, Shizuoka Cancer Center, Shizuoka, Japan
| | - Yasuto Akiyama
- Research Institute, Shizuoka Cancer Center, Shizuoka, Japan
| | | | - Kazuo Kishi
- Department of Plastic Surgery, School of Medicine, Keio University, Tokyo, Japan
| | - Keita Inoue
- Division of Plastic and Reconstructive Surgery, Shizuoka Cancer Center, Shizuoka, Japan
- Department of Plastic and Reconstructive Surgery, School of Medicine, Jichi Medical University, Tochigi, Japan
- Avenue Cell Clinic, Tokyo, Japan
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Matsuoka Y, Kurata H. Modeling and simulation of the redox regulation of the metabolism in Escherichia coli at different oxygen concentrations. Biotechnol Biofuels 2017; 10:183. [PMID: 28725263 PMCID: PMC5512849 DOI: 10.1186/s13068-017-0867-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [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: 03/13/2017] [Accepted: 07/05/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Microbial production of biofuels and biochemicals from renewable feedstocks has received considerable recent attention from environmental protection and energy production perspectives. Many biofuels and biochemicals are produced by fermentation under oxygen-limited conditions following initiation of aerobic cultivation to enhance the cell growth rate. Thus, it is of significant interest to investigate the effect of dissolved oxygen concentration on redox regulation in Escherichia coli, a particularly popular cellular factory due to its high growth rate and well-characterized physiology. For this, the systems biology approach such as modeling is powerful for the analysis of the metabolism and for the design of microbial cellular factories. RESULTS Here, we developed a kinetic model that describes the dynamics of fermentation by taking into account transcription factors such as ArcA/B and Fnr, respiratory chain reactions and fermentative pathways, and catabolite regulation. The hallmark of the kinetic model is its ability to predict the dynamics of metabolism at different dissolved oxygen levels and facilitate the rational design of cultivation methods. The kinetic model was verified based on the experimental data for a wild-type E. coli strain. The model reasonably predicted the metabolic characteristics and molecular mechanisms of fnr and arcA gene-knockout mutants. Moreover, an aerobic-microaerobic dual-phase cultivation method for lactate production in a pfl-knockout mutant exhibited promising yield and productivity. CONCLUSIONS It is quite important to understand metabolic regulation mechanisms from both scientific and engineering points of view. In particular, redox regulation in response to oxygen limitation is critically important in the practical production of biofuel and biochemical compounds. The developed model can thus be used as a platform for designing microbial factories to produce a variety of biofuels and biochemicals.
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Affiliation(s)
- Yu Matsuoka
- Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502 Japan
| | - Hiroyuki Kurata
- Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502 Japan
- Biomedical Informatics R&D Center, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka, 820-8502 Japan
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