Bioelectrochemical regulation accelerates facultatively syntrophic proteolysis(ENVIRONMENTAL BIOTECHNOLOGY)
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概要
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Bioelectrochemical systems can affect microbial metabolism by controlling the redox potential. We constructed bioelectrochemical cultures of the proteolytic bacterium, Coprothermobacter proteolyticus strain CT-1, both as a single- culture and as a co-culture with the hydrogenotrophic methanogen, Methanothermobacter thermautotrophicus strain ΔH, to investigate the influences of bioelectrochemical regulation on facultatively syntrophic proteolysis. The co-culture and single-culture were cultivated at 55℃ with an anaerobic medium containing casein as the carbon source. The working electrode potential of the bioelectrochemical system was controlled at -0.8 V (vs. Ag/AgCl) for bioelectrochemical cultures and was not controlled for non-bioelectrochemical cultures. The cell densities of hydrogenotrophic methanogen and methane production in the bioelectrochemical co-culture were 3.6 and 1.5 times higher than those in the non-bioelectrochemical co-culture after 7 days of cultivation, respectively. Contrastingly, the cell density of Coprothermobacter sp. in the bioelectrochemical co-culture was only 1.3 times higher than that in the nonbioelectrochemical co-culture. The protein decomposition rates were nearly proportional to the cell density of Coprothermobacter sp. in the all types of cultures. These results indicate that bioelectrochemical regulation, particularly, affected the carbon fixation of the hydrogenotrophic methanogen and that facultatively syntrophic proteolysis was accelerated as a result of hydrogen consumption by the methanogens growing well in bioelectrochemical co-cultures.
著者
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Ohmura Naoya
Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry (cri
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Sasaki Kengo
Environmental Sci. Res. Lab. Central Res. Inst. Of Electric Power Ind. (criepi) 1646 Abiko Abiko-shi
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Hirano Shin-ichi
Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry (cri
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Sasaki Daisuke
Department Of Biotechnology Graduate School Of Agricultural And Life Sciences The University Of Toky
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Sasaki Daisuke
Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry (cri
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Matsumoto Norio
Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry (cri
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Sasaki Kengo
Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Elect
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Morita Masahiko
Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Elect
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Sasaki Daisuke
Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Elect
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Matsumoto Norio
Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Elect
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Hirano Shin-ichi
Biotechnology Sector Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry
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Ohmura Naoya
Biotechnology Sector Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry
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Morita Masahiko
Biotechnology Sector Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry
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Sasaki Daisuke
Biotechnology Sector Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry
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Matsumoto Norio
Biotechnology Sector Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry
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Sasaki Kengo
Biotechnology Sector Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry:(present Office)department Of Biotechnology Graduate School Of Agricultural And Life Sciences The University Of Tokyo
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