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Murakami K, Isano Y, Asada J, Usami N, Isoda Y, Takano T, Matsuda R, Ueno K, Fuchiwaki O, Ota H. Self-assembling bilayer wiring with highly conductive liquid metal and insulative ion gel layers. Sci Rep 2023; 13:5929. [PMID: 37045927 PMCID: PMC10097700 DOI: 10.1038/s41598-023-32580-x] [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: 01/14/2023] [Accepted: 03/29/2023] [Indexed: 04/14/2023] Open
Abstract
Ga-based liquid metals (LMs) are expected to be suitable for wiring highly deformable devices because of their high electrical conductivity and stable resistance to extreme deformation. Injection and printed wiring, and wiring using LM-polymer composites are the most popular LM wiring approaches. However, additional processing is required to package the wiring after LM patterning, branch and interrupt wiring shape, and ensure adequate conductivity, which results in unnecessary wiring shape changes and increased complexity of the wiring methods. In this study, we propose an LM-polymer composite comprising LM particles and ion gel as a flexible matrix material with low viscosity and specific gravity before curing. Moreover, the casting method is used for wire patterning, and the material is cured at room temperature to ensure that the upper insulative layer of the ion gel self-assembles simultaneously with the formation of LM wiring in the lower layer. High conductivity and low resistance change rate of the formed wiring during deformation are achieved without an activation process. This ion gel-LM bilayer wiring can be used for three-dimensional wiring by stacking. Furthermore, circuits fabricated using ion gel-LM bilayer wiring exhibit stable operation. Therefore, the proposed method can significantly promote the development of flexible electronic devices.
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Affiliation(s)
- Koki Murakami
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan
| | - Yuji Isano
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan
| | - Juri Asada
- Department of Chemistry and Life Science, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan
| | - Natsuka Usami
- Department of Chemistry and Life Science, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan
| | - Yutaka Isoda
- Graduate School of System Integration, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan
| | - Tamami Takano
- Graduate School of System Integration, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan
| | - Ryosuke Matsuda
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan
| | - Kazuhide Ueno
- Department of Chemistry and Life Science, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan
- Graduate School of Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan
| | - Ohmi Fuchiwaki
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan.
- Graduate School of System Integration, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan.
| | - Hiroki Ota
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan.
- Graduate School of System Integration, Yokohama National University, 79-5, Tokiwadai, Hodogaya-Ku, Yokohama, Kanagawa, 240-8501, Japan.
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Murakami K, Tochinai R, Tachibana D, Isano Y, Matsuda R, Nakamura F, Kurotaki Y, Isoda Y, Yamane M, Sugita Y, Fukuda J, Ueno K, Miki N, Fuchiwaki O, Ota H. Direct Wiring of Liquid Metal on an Ultrasoft Substrate Using a Polyvinyl Alcohol Lift-off Method. ACS Appl Mater Interfaces 2022; 14:7241-7251. [PMID: 35084813 DOI: 10.1021/acsami.1c20628] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In recent years, wiring and system construction on ultrasoft materials such as biological tissues and hydrogels have been proposed for advanced wearable devices, implantable devices, and soft robotics. Among the soft conductive materials, Ga-based liquid metals (LMs) are both biocompatible and ultrasoft, making them a good match for electrodes on the ultrasoft substrates. However, gels and tissues are softer and less wettable to the LMs than conventional soft substrates such as Ecoflex and polydimethylsiloxane. In this study, we demonstrated the transfer of LM paste composed of Ga-based LM and Ni nanoparticles onto ultrasoft substrates such as biological tissue and gels using sacrificial polyvinyl alcohol (PVA) films. The LM paste pattern fabricated on the PVA film adhered to the ultrasoft substrate along surface irregularities and was transferred without being destroyed by the PVA film before the PVA's dissolution in water. The minimum line width that could be wired was approximately 165 μm. Three-dimensional wiring, such as the helical structure on the gel fiber surface, is also possible. Application of this transfer method to tissues using LM paste wiring allowed the successful stimulation of the vagus nerve in rats. In addition, we succeeded in transferring a temperature measurement system fabricated on a PVA film onto the gel. The connection between the solid-state electrical element and the LM paste was stable and maintained the functionality of the temperature-sensing system. This fundamental study of wiring fabrication and system integration can contribute to the development of advanced electric devices based on ultrasoft substrates.
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Affiliation(s)
- Koki Murakami
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Ryota Tochinai
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Daiki Tachibana
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Yuji Isano
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Ryosuke Matsuda
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Fumika Nakamura
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Yuta Kurotaki
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Yutaka Isoda
- Graduate School of System Integration, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Monami Yamane
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Yuya Sugita
- Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Junji Fukuda
- Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Kazuhide Ueno
- Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Norihisa Miki
- Department of Mechanical Engineering, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Ohmi Fuchiwaki
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
- Graduate School of System Integration, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Hiroki Ota
- Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
- Graduate School of System Integration, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
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Inamori G, Kamoto U, Nakamura F, Isoda Y, Uozumi A, Matsuda R, Shimamura M, Okubo Y, Ito S, Ota H. Neonatal wearable device for colorimetry-based real-time detection of jaundice with simultaneous sensing of vitals. Sci Adv 2021; 7:eabe3793. [PMID: 33658197 PMCID: PMC7929506 DOI: 10.1126/sciadv.abe3793] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 01/21/2021] [Indexed: 05/19/2023]
Abstract
Neonatal jaundice occurs in >80% of newborns in the first week of life owing to physiological hyperbilirubinemia. Severe hyperbilirubinemia could cause brain damage owing to its neurotoxicity, a state commonly known as kernicterus. Therefore, periodic bilirubin monitoring is essential to identify infants at-risk and to initiate treatment including phototherapy. However, devices for continuous measurements of bilirubin have not been developed yet. Here, we established a wearable transcutaneous bilirubinometer that also has oxygen saturation (SpO2) and heart rate (HR) sensing functionalities. Clinical experiments with neonates demonstrated the possibility of simultaneous detection of bilirubin, SpO2, and HR. Moreover, our device could consistently measure bilirubin during phototherapy. These results demonstrate the potential for development of a combined treatment approach with an automatic link via the wearable bilirubinometer and phototherapy device for optimization of the treatment of neonatal jaundice.
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Affiliation(s)
- Go Inamori
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Umihiro Kamoto
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Fumika Nakamura
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Yutaka Isoda
- Graduate School of System Integration, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Azusa Uozumi
- Department of Pediatrics, Graduate School of Medicine, Yokohama City University, 3-9 Fukura, Kanazawa-ku, Yokohama, Kanagawa 236-0004, Japan
| | - Ryosuke Matsuda
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Masaki Shimamura
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Yusuke Okubo
- Division of Cellular and Molecular Toxicology, Biological Safety and Research Center, National Institute of Health Sciences, Tonomachi 3-25-26, Kawasaki, Kanagawa 210-9501, Japan
| | - Shuichi Ito
- Department of Pediatrics, Graduate School of Medicine, Yokohama City University, 3-9 Fukura, Kanazawa-ku, Yokohama, Kanagawa 236-0004, Japan
| | - Hiroki Ota
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan.
- Graduate School of System Integration, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
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Takaya M, Matsuda R, Inamori G, Kamoto U, Isoda Y, Tachibana D, Nakamura F, Fuchiwaki O, Okubo Y, Ota H. Transformable Electrocardiograph Using Robust Liquid-Solid Heteroconnector. ACS Sens 2021; 6:212-219. [PMID: 33395271 DOI: 10.1021/acssensors.0c02135] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
In this study, a highly transformable electrocardiograph that can considerably deform the position of stretchable electrodes based on the lead method for diagnosing heart disease was developed; these electrodes exhibited high resistance stability against considerable stretching and multiple stretching. To realize the large deformable functionality of the electrodes of a system, liquid metal electrodes and a heteroconnector composed of a liquid metal paste and carbon-based conductive rubber were employed. The developed device can achieve a 200% strain with only 6% resistance change and a high stability of resistances after the 100-time stretching test. In addition, the study demonstrated electrocardiograms in different lead methods of adult and child using the same device. The proposed combination of large deformable electrodes with high electric stability and a robust heteroconnector is an important technology, and it presents a considerable advancement in the application of stretchable electronic systems.
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Affiliation(s)
- Maika Takaya
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Ryosuke Matsuda
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Go Inamori
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Umihiro Kamoto
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Yutaka Isoda
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Daiki Tachibana
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Fumika Nakamura
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Ohmi Fuchiwaki
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
- Graduate School of System Integration, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Yusuke Okubo
- Division of Cellular and Molecular Toxicology, Biological Safety and Research Center, National Institute of Health Sciences, Tonomachi 3-25-26, Kawasaki, Kanagawa 210-9501, Japan
| | - Hiroki Ota
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
- Graduate School of System Integration, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
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Matsuda R, Mizuguchi S, Nakamura F, Endo T, Isoda Y, Inamori G, Ota H. Highly stretchable sensing array for independent detection of pressure and strain exploiting structural and resistive control. Sci Rep 2020; 10:12666. [PMID: 32728079 PMCID: PMC7391712 DOI: 10.1038/s41598-020-69689-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 07/06/2020] [Indexed: 11/29/2022] Open
Abstract
Stretchable physical sensors are crucial for the development of advanced electrical systems, particularly wearable devices and soft robotics. Currently available stretchable sensors that detect both pressure and strain are based on piezoelectric, piezoresistive, or piezocapacitive effects. The range of pressure sensing is 1–800 kPa with large deformations being within the range of deformations of parts of the human body, such as elbows and knees. However, these devices cannot easily allow simultaneous and independent detection of pressure and strain with sensor arrays at large tensions (> 50%) because strain affects the pressure signal. In this study, we propose a monolithic silicone-based array of pressure and strain sensors that can simultaneously and independently detect the in-plane biaxial tensile deformation and pressure. To realize these functionalities, the deformation of the device structure was optimized using a hetero-silicone substrate made of two types of silicone with different hardness characteristics and porous silicone bodies. In addition, the resistances of the sensors were controlled by adjusting a mixture based on carbon nanoparticles to improve the sensitivity and independence between the pressure and strain sensors. These concepts demonstrate the potential of this approach and its compatibility with the current architectures of stretchable physical sensors.
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Affiliation(s)
- Ryosuke Matsuda
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Satoru Mizuguchi
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Fumika Nakamura
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Takuma Endo
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Yutaka Isoda
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Go Inamori
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan
| | - Hiroki Ota
- Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan. .,Graduate School of System Integration, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan.
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Inoue M, Morokado T, Fujimoto K, Miki S, Kofuji H, Isoda Y, Nagao S. Vertical profiles of Fukushima Dai-ichi NPP-derived radiocesium concentrations in the waters of the southwestern Okhotsk Sea (2011-2017). J Environ Radioact 2018; 192:580-586. [PMID: 29724459 DOI: 10.1016/j.jenvrad.2018.04.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 04/05/2018] [Accepted: 04/22/2018] [Indexed: 06/08/2023]
Abstract
We examined the vertical 134Cs and 137Cs concentration profiles in the southwestern Okhotsk Sea in 2011, 2013, and 2017. In June 2011, atmospheric deposition-derived 134Cs from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) was detected at depths of 0-200 m (0.06-0.6 mBq/L). In July 2013, 134Cs detected at depths of 100-200 m (∼0.05 mBq/L) was ascribed to the transport of low-level 134Cs-contaminated water and/or the convection of radioactive depositions (<0.03 mBq/L at depths of 0-50 m). In July 2017, 134Cs was detected in water samples at depths above 300 m (0.03-0.05 mBq/L), and the inventory, decay-corrected to the FDNPP accident date, exhibited its maximum value (85 Bq/m2) during this period. Combining temperature-salinity data with the concentrations of global fallout-derived 137Cs led to a plausible explanation for this observation, which is a consequence of re-entry of FDNPP-derived radiocesium through the Kuril Strait from the northwestern North Pacific Ocean to the Okhotsk Sea and subsequent mixing with the south Okhotsk subsurface layer until 2017.
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Affiliation(s)
- Mutsuo Inoue
- Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa, 923-1224, Japan.
| | - Toshiki Morokado
- Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa, 923-1224, Japan
| | - Ken Fujimoto
- National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, 2-12-4, Fukuura, Kanazawa, Yokohama, 236-8648, Japan
| | - Shizuho Miki
- National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, 2-12-4, Fukuura, Kanazawa, Yokohama, 236-8648, Japan
| | - Hisaki Kofuji
- Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa, 923-1224, Japan
| | - Yutaka Isoda
- Graduate School of Fisheries Sciences, Hokkaido University, Minato-cho, Hakodate, 041-8611, Japan
| | - Seiya Nagao
- Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa, 923-1224, Japan
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Iida H, Isoda Y, Kobayashi N, Horio K. Observations and model experiments of the diurnal eddy of the Cold Water Belt along the offshore side of the Soya Warm Current. ACTA ACUST UNITED AC 2018. [DOI: 10.5928/kaiyou.27.4_155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Hiroyuki Iida
- Graduate School of Env. Earth Science, Hokkaido University
| | - Yutaka Isoda
- Graduate School of Fisheries Science, Hokkaido University
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Kukida Y, Kida T, Inoue T, Isoda Y, Sagawa T, Ishigaki R, Kasahara A, Nakabayashi A, Fujioka K, Nagahara H, Fujii W, Murakami K, Seno T, Yamamoto A, Kohno M, Kawahito Y. AB0501 Retrospective Study of Multitarget Therapy with Combination of Mizoribine and Tacrolimus for Systemic Lupus Erythematosus with or without Nephritis. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.3186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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9
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Inoue M, Furusawa Y, Fujimoto K, Minakawa M, Kofuji H, Nagao S, Yamamoto M, Hamajima Y, Yoshida K, Nakano Y, Hayakawa K, Oikawa S, Misonoo J, Isoda Y. 228Ra/226Ra ratio and 7Be concentration in the Sea of Japan as indicators for water transport: comparison with migration pattern of Fukushima Dai-ichi NPP-derived 134Cs and 137Cs. J Environ Radioact 2013; 126:176-187. [PMID: 24029140 DOI: 10.1016/j.jenvrad.2013.08.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 07/13/2013] [Accepted: 08/01/2013] [Indexed: 06/02/2023]
Abstract
To assess the migration patterns of radiocesium emitted from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP), we analyzed (228)Ra/(226)Ra ratios and (7)Be concentrations and compared them with (134)Cs and (137)Cs concentrations in seawater samples collected within the Sea of Japan before and after the FDNPP accident (i.e., during the period 2007-2012) using low-background γ-spectrometry. The (228)Ra/(226)Ra ratios in surface waters exhibited lateral and seasonal variations, reflecting the flow patterns of surface water. This indicates the transport patterns of the FDNPP-derived radiocesium by surface water. Cosmogenic (7)Be (half-life: 53.3 d) exhibited markedly high concentrations (5-10 mBq/L) at depths shallower than 50 m, with concentrations decreasing steeply (0.2-2 mBq/L) at depths of 50-250 m. The distribution of (7)Be concentrations suggests that the downward delivery of the FDNPP-derived radiocesium to below 50 m depth was negligible for a few months prior to its removal from the Sea of Japan.
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Affiliation(s)
- M Inoue
- Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Nomi, Ishikawa 923-1224, Japan.
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Inoue M, Kofuji H, Nagao S, Yamamoto M, Hamajima Y, Yoshida K, Fujimoto K, Takada T, Isoda Y. Lateral variation of 134Cs and 137Cs concentrations in surface seawater in and around the Japan Sea after the Fukushima Dai-ichi Nuclear Power Plant accident. J Environ Radioact 2012; 109:45-51. [PMID: 22269444 DOI: 10.1016/j.jenvrad.2012.01.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 12/19/2011] [Accepted: 01/05/2012] [Indexed: 05/31/2023]
Abstract
A total of 82 surface seawater samples was collected in the Japan Sea and the southwestern Okhotsk Sea before and after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. Analysis of (134)Cs and (137)Cs concentrations using low-background γ-spectrometry revealed that the (137)Cs concentration of the samples collected in June 2011 was 1.5-2.8mBq/L, which is approximately 1-2 times higher than the pre-accident (137)Cs level, while the (134)Cs concentration was less than detectable to 1mBq/L. In addition to (134)Cs being clearly detected (∼1mBq/L), (137)Cs concentration in water samples from the northeastern Japan Sea (2-2.8mBq/L) was also higher than that from the coast in the southwestern Japan Sea (∼1.5mBq/L). These higher concentrations in the northeastern Japan Sea could be ascribed to the atmospheric transport of nuclides from the FDNPP as aerosols and subsequent transport and dilution after delivery to the sea surface.
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Affiliation(s)
- M Inoue
- Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University, Nomi, Ishikawa 923-1224, Japan.
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Fujita S, Kuma K, Ishikawa S, Nishimura S, Nakayama Y, Ushizaka S, Isoda Y, Otosaka S, Aramaki T. Iron distributions in the water column of the Japan Basin and Yamato Basin (Japan Sea). ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010jc006123] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Kitayama S, Kuma K, Manabe E, Sugie K, Takata H, Isoda Y, Toya K, Saitoh SI, Takagi S, Kamei Y, Sakaoka K. Controls on iron distributions in the deep water column of the North Pacific Ocean: Iron(III) hydroxide solubility and marine humic-type dissolved organic matter. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jc004754] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Koizumi N, Isoda Y, Maeda K, Masuda S, Fibriansah G, Kumasaka T, Yatsunami R, Fukui T, Nakamura S. Characterization of Nocardiopsis -1,3-glucanase with additional carbohydrate-binding domains. ACTA ACUST UNITED AC 2007:459-60. [DOI: 10.1093/nass/nrm230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Aoshima D, Watari T, Ishikawa S, Isoda Y, Antonio K, Luacute J. P11.10 Developing the First Steps for Infection Control in a Tertiary Care Hospital in Luanda, Angola. J Hosp Infect 2006. [DOI: 10.1016/s0195-6701(06)60194-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Imamura E, Hamada Y, Sekiguchi T, Isoda Y, Kamikura T, Seto K. Clinical evaluation of autogenous bone grafts with titanium mesh or screw for alveolar ridge augmentation. Int J Oral Maxillofac Surg 2005. [DOI: 10.1016/s0901-5027(05)80888-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Abstract
Evolutionary branching, which is a coevolutionary phenomenon of the development of two or more distinctive traits from a single trait in a population, is the issue of recent studies on adaptive dynamics. In previous studies, it was revealed that trait variance is a minimum requirement for evolutionary branching, and that it does not play an important role in the formation of an evolutionary pattern of branching. Here we demonstrate that the trait evolution exhibits various evolutionary branching paths starting from an identical initial trait to different evolutional terminus traits as determined by only changing the assumption of trait variance. The key feature of this phenomenon is the topological configuration of equilibria and the initial point in the manifold of dimorphism from which dimorphic branches develop. This suggests that the existing monomorphic or polymorphic set in a population is not an unique inevitable consequence of an identical initial phenotype.
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Affiliation(s)
- Kinya Nishimura
- Faculty of Fisheries, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1, Minato-Cho, Room S514, Hakodate 041-8611, Japan.
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17
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Abstract
A rational explanation for cannibalism is that it would be favored under conditions of crowding of conspecific individuals and/or low availability of alternative prey with the fear of starvation, so as to maximize individual fitness. Cannibalism has, however, not evolved and is not maintained by a simple individual optimization, while it has evolved and is maintained as a game among population members. We analysed the attainable state of an evolutionary cannibalism game within a framework that reflects the minimum essence of cause-effect in the cannibalism phenomenon. Cannibalism is predator-prey interaction among conspecifics. Immediate direct payoffs (survival in the interaction among conspecifics) and indirect payoffs (growth results in potential productivity and survival against the threat of starvation) would be included. No morphological specialization and no size priority of cannibalism individuals are assumed as conservative situations in which we analyse the possibility of cannibalism. Cannibalism would be possible under the conservative condition, if initially the wild population's cannibalism rate is not sufficiently lower than a threshold value. Crowding and/or low availability of alternative prey with the fear of starvation facilitates cannibalism evolution. Energy gain from conspecific prey would be attenuated by costs of counterattacks by conspecific victims and by challenge cost of its own. Discounting net intake energy required in the arms race for cannibalism challenge result in a relative disadvantage of having a high cannibalism rate and makes an evolutionary equilibrium of low cannibalism rate, even when potential profitability of conspecific prey is high.
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Affiliation(s)
- Kinya Nishimura
- Faculty of Fisheries, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Room S514, Hakodate 041-8611, Japan.
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18
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Kuroda H, Isoda Y, Ohnishi M, Iwahashi M, Satoh C, Nakayama T, Ito T, Iseda KI, Nishizawa K, Shima S, Togawa O. Examination of Harmonic Analysis Methods Using Semi-regular Sampling Data from an ADCP Installed on a Regular Ferry: Evaluation of Tidal and Residual Currents in the Eastern Mouth of the Tsugaru Strait. ACTA ACUST UNITED AC 2004. [DOI: 10.5928/kaiyou.13.553] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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19
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Nakazawa Y, Tahara H, Suyama H, Kakio T, Ohue Y, Goto Y, Inoue K, Nakamura N, Masui K, Isoda Y. [Evaluation of area at risk by 123I-BMIPP in patients with acute myocardial infarction]. Kaku Igaku 1996; 33:73-6. [PMID: 8819717] [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] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The purpose of this study was to investigate the detection of area at risk of acute myocardial infarction (AMI) by 123I-BMIPP (BMIPP). 99mTc-tetrofosmin (TF) scintigraphy was performed on 13 patients with AMI with total coronary occlusion. BMIPP scintigraphy was done on the same patients within 1 week after successful reperfusion by direct PTCA. Activity of both tracers was scored in 8 basal, 8 midventricular and 2 apical segments, using a four-point grading system as defect score: 3 = defect, 2 = severely low uptake, 1 = slightly low uptake, 0 = normal. Extent score (ES) was defined as a total number of segment which deteriorated of uptake, and severity score (SS) was defined as a total score of defect score. ES of BMIPP was 6.5 +/- 2.4 and that of TF was 7.5 +/- 2.4. ES of BMIPP was smaller than that of TF. A ratio of BMIPP/TF was 0.86 +/- 0.18. SS of BMIPP was 16.2 +/- 6.0 and that of TF was 19.2 +/- 5.6. SS of TF was larger than that of BMIPP. A ratio of BMIPP/TF was 0.83 +/- 0.18. A correlation of ES and SS between TF and BMIPP was excellent. BMIPP showed ischemic area by culprit lesion and infarct area clearly. We concluded that BMIPP could indicate area at risk.
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Affiliation(s)
- Y Nakazawa
- Department of Cardiology, Matsue Red Cross Hospital, Japan
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20
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Abstract
BACKGROUND Epidemiologic and experimental studies suggest that dietary fish oil and vegetable oil high in omega-3 polyunsaturated fatty acids (PUFAs) suppress the risk of colon cancer. The optimal amount to prevent colon carcinogenesis with perilla oil high in omega-3 PUFA alpha-linolenic acid in a 12% medium-fat diet was investigated in female F344 rats. For comparison, safflower oil high in omega-6 PUFA linoleic acid was used. METHODS Thirty or 25 rats at 7 weeks of age in each group received an intrarectal dose of 2 mg N-methyl-N-nitrosourea 3 times weekly in weeks 1 and 2 and were fed the diets with various levels of perilla oil and safflower oil throughout the experiment. RESULTS The incidence of colon cancer at the termination of the experiment at week 35 was 40%, 48% and 32% in the rats fed the diets with 3% perilla oil plus 9% safflower oil, 6% perilla oil plus 6% safflower oil, and 12% perilla oil plus 0% safflower oil, respectively, whereas it was 67% in the rats fed the control diet with 0% perilla oil plus 12% safflower oil. The amount of diet consumed and the body weight gain were identical in all of the dietary groups. The ratios of omega-3 PUFA to omega-6 PUFA in the serum and the colonic mucosa at week 35 were increased in parallel to the increased intake of perilla oil. CONCLUSIONS The results suggest that a relatively small fraction of perilla oil, 25% of total dietary fat, may provide an appreciable beneficial effect in lowering the risk of colon cancer.
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Affiliation(s)
- T Narisawa
- Akita University College of Allied Medical Science, Japan
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21
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Abstract
Michaelis constants (Kms) and molecular activities (kos) of phenyl, p-nitrophenyl and p-methylphenyl alpha-maltoside for taka-amylase A catalyzed hydrolyses were determined in H2O and in D2O at pH or pD 5.3 and at 25 degrees C. Production of alpha-maltose in the hydrolysis was confirmed by 1H NMR. Neither substituent nor solvent deuterium isotope effects on Kms for phenyl, p-nitrophenyl and p-methylphenyl alpha-maltosides were detected. On the other hand, substituent effects on kos of these compounds were evident, but the isotope effects on kos were not marked, so that protonation of the substrate in the catalytic reaction might not be rate-limiting. The result indicates that nucleophilic attack of a carboxylate anion of the enzyme upon the protonated substrate is the rate-limiting step in the hydrolysis proceeding through the nucleophilic double displacement mechanism, which involves a covalently bonded glycosyl intermediate. The molecular orbitals of phenyl alpha-D-glucosides as model compounds of phenyl alpha-maltosides were calculated by the AM1 method. From the results, it was concluded that the lowering of the lowest unoccupied molecular orbital (LUMO) energy levels and the increase of distribution of LUMO on the anomeric carbon, C-1, of the compounds are caused by protonation at the glycosidic oxygen from the protonated carboxyl group of the enzyme. This causes acceleration of the hydrolysis of a substrate by the enzyme.
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Affiliation(s)
- Y Isoda
- Department of General Education, Osaka Institute of Technology
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Hayashi Y, Fukushima S, Kishimoto S, Kawaguchi T, Numata M, Isoda Y, Hirano J, Nakano M. Anticancer effects of free polyunsaturated fatty acids in an oily lymphographic agent following intrahepatic arterial administration to a rabbit bearing VX-2 tumor. Cancer Res 1992; 52:400-5. [PMID: 1309442] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The anti-hepatic cancer effects of three free polyunsaturated fatty acids (linoleic, alpha-linolenic, and gamma-linolenic acids) dissolved in an oily lymphographic agent, Lipiodol Ultra-Fluid (Lipiodol), following intrahepatic arterial administration were examined using a rabbit liver cancer model, VX-2. The tumor was inoculated into the subcapsular parenchyma of the liver of rabbits, and Lipiodol alone or Lipiodol containing each one of the free fatty acids was administered into the hepatic artery 14 days after inoculation. The rabbits were sacrificed 7 days after administration. Lipiodol containing one of the fatty acids selectively remained in the tumor area. Although VX-2 tumor grew extensively in both the untreated group and the group that received Lipiodol alone, growth of VX-2 tumor was greatly suppressed in the group that received Lipiodol containing the free fatty acid. Pathological observation also showed that Lipiodol containing the free fatty acid had an anticancer effect on VX-2 tumor growing in the liver of rabbits. Average survival days in the group treated with Lipiodol containing gamma-linolenic acid were significantly prolonged compared with those in the control groups. Although growth rates of the tumor at the death of rabbits were large in the control groups, VX-2 tumor shrank at death of five rabbits of six in the group treated with Lipiodol containing gamma-linolenic acid. These results suggest that the intrahepatic arterial administration of Lipiodol containing the free fatty acids is an effective method of delivery of these fatty acids as anticancer agents.
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Affiliation(s)
- Y Hayashi
- Department of Pharmacy, Kumamoto University Hospital, Japan
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Narisawa T, Takahashi M, Kotanagi H, Kusaka H, Yamazaki Y, Koyama H, Fukaura Y, Nishizawa Y, Kotsugai M, Isoda Y. Inhibitory effect of dietary perilla oil rich in the n-3 polyunsaturated fatty acid alpha-linolenic acid on colon carcinogenesis in rats. Jpn J Cancer Res 1991; 82:1089-96. [PMID: 1683347 PMCID: PMC5918260 DOI: 10.1111/j.1349-7006.1991.tb01762.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The inhibitory effect of dietary perilla oil rich in the n-3 polyunsaturated fatty acid alpha-linolenic acid against colon carcinogenesis was investigated in rats. Four groups of 26 F344 rats each received an intrarectal dose of 2 mg of N-methyl-N-nitrosourea 3 times a week for 2 weeks, and received a diet containing 12% perilla oil, 6% or 12% safflower oil (rich in the n-6 polyunsaturated fatty acid linoleic acid), or 12% palm oil (rich in saturated and monounsaturated fatty acids). At week 35, the incidence of colon cancer was significantly lower in perilla oil-fed rats than in other dietary groups; 19% vs. 46%, 56% and 58%. When examined at week 10, the concentration of fecal bile acids, known to be tumor promoters, was not significantly different among the dietary groups, and the intrarectal deoxycholic acid-induced colonic mucosal ornithine decarboxylase activity, a marker of tumor promotion, was significantly lower in perilla oil-fed group than in other groups. The serum and colonic mucosal fatty acid compositions and the blood plasma prostaglandin E2 level directly reflected the fatty acid composition of each dietary fat. The results suggest that the anti-tumor-promoting effect of dietary perilla oil was a result of a decreased sensitivity of colonic mucosa to tumor promoters arising from the altered fatty acid composition in membrane phospholipid of colonic epithelial cells, and was not a consequence of a decrease of promoters such as bile acids.
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Affiliation(s)
- T Narisawa
- Department of Surgery, Akita University School of Medicine
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24
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Nitta Y, Isoda Y, Toda H, Sakiyama F. Identification of glutamic acid 186 affinity-labeled by 2,3-epoxypropyl alpha-D-glucopyranoside in soybean beta-amylase. J Biochem 1989; 105:573-6. [PMID: 2474529 DOI: 10.1093/oxfordjournals.jbchem.a122706] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Soybean beta-amylase was modified with 2,3-epoxypropyl alpha-D-[U-14C]glucopyranoside ([14C]alpha-EPG), a radioactive affinity-labeling reagent for beta-amylase, until it lost 95% of its enzyme activity. After S-carboxymethylation at pH 8.0 of SH groups, the modified enzyme was digested at pH 7.0 with Achromobacter protease I and the digest was fractionated by reverse-phase HPLC. A radioactive peptide was finally isolated and its amino acid sequence was determined to be 181Leu-Gly-Pro-Ala-Gly-Glu186. Radioactivity derived from [14C]-alpha-EPG was found exclusively at Glu-186, the gamma-carboxyl group of which is esterified with the affinity label. It was concluded that the carboxylate of Glu-186 is a functional group at the catalytic site of soybean beta-amylase.
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Affiliation(s)
- Y Nitta
- Laboratory of Biophysical Chemistry, College of Agriculture, University of Osaka Prefecture
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Abstract
The synthesized 2',3'-epoxypropyl alpha-D-glucopyranoside (alpha-EPG) inactivated soybean beta-amylase completely. The incorporation of alpha-EPG into the enzyme at 92% inactivation was 1.1 mol per mol of enzyme, as determined by using 14C-labeled alpha-EPG. The inactivation obeyed saturation kinetics of a two-step mechanism. The dissociation constant of alpha-EPG-enzyme complex and the rate constant of the irreversible inactivation step were estimated to be 119 mM and 1.14 X 10(-3)s-1, respectively. alpha-Cyclodextrin, a competitive inhibitor of this enzyme, protected the enzyme against the inactivation by alpha-EPG in a competitive manner. This suggests that alpha-EPG binds to the active site of the enzyme. The above results indicate that alpha-EPG acts on soybean beta-amylase as an affinity labeling reagent. It was also shown that an essential SH group near the active site, but not the catalytic one, scarcely participated in the inactivation by alpha-EPG.
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Isoda Y, Tominaga M, Marubashi S, Kaneda H, Sasaki H. [Total GLI (glucagon-like immunoreactivity) radioimmunoassay kit--experimental study]. Horumon To Rinsho 1982; 30:1427-31. [PMID: 7160089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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27
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Yaginuma H, Isoda Y, Wada Y, Itoh S, Yamazaki M, Kamada A, Shimazu H, Makita I. Rectal delivery of antiinflammatory drugs. III. Effect of basic amino acid salts of diclofenac on the rectal absorption of ampicillin sodium. Chem Pharm Bull (Tokyo) 1982; 30:1073-6. [PMID: 7094167 DOI: 10.1248/cpb.30.1073] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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28
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Ono K, Tago M, Hamaguchi K, Ohishi K, Isoda Y. [Preisthmic type aortic coarctation and its surgical management]. Kyobu Geka 1976; 29:889-93. [PMID: 1034147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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29
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Ono K, Tago M, Hamaguchi K, Isoda Y, Sugimoto M. [Surgical management of idiopathic hypertrophic subaortic stenosis--with special reference to a case with ECG presentation of myocardial infarct]. Kyobu Geka 1976; 29:575-81. [PMID: 988380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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30
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Ono K, Tako M, Hamaguchi K, Ogino K, Isoda Y. [A case report of aorto-carotid bypass with use of saphenous vein in advanced stage of aortitis syndrome (author's transl)]. Kokyu To Junkan 1975; 23:1015-9. [PMID: 1836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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