Light/electricity conversion by defined cocultures of Chlamydomonas and Geobacter(ENVIRONMENTAL BIOTECHNOLOGY)
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概要
- 論文の詳細を見る
Biological energy-conversion systems are attractive in terms of their self-organizing and self-sustaining properties and are expected to be applied towards environmentally friendly bioenergy processes. Recent studies have demonstrated that sustainable light/electricity-conversion systems, termed microbial solar cells (MSCs), can be constructed using naturally occurring microbial communities. To better understand the energy-conversion mechanisms in microbial communities, the present study attempted to construct model MSCs comprised of defined cocultures of a green alga, Chlamydomonas reinhardtii, and an iron-reducing bacterium, Geobacter sulfurreducens, and examined their metabolism and interactions in MSCs. When MSC bioreactors were inoculated with these microbes and irradiated on a 12-h light/ dark cycle, periodic current was generated in the dark with energy-conversion efficiencies of 0.1%. Metabolite analyses revealed that G. sulfurreducens generated current by oxidizing formate that was produced by C. reinhardtii in the dark. These results demonstrate that the light/electricity conversion occurs via syntrophic interactions between phototrophs and electricity-generating bacteria. Based on the results and data in literatures, it is estimated that the excretion of organics by the phototroph was the bottleneck step in the syntrophic light/electricity conversion. We also discuss differences between natural-community and defined-coculture MSCs.
- 2013-04-00
著者
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Watanabe Kazuya
Hashimoto Light Energy Conversion Project Erato Jst
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Nishio Koichi
Department Of Applied Chemistry Faculty Of Science Science University Of Tokyo (sut)
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Hashimoto Kazuhito
Deparment of Applied Chemistry, Faculty of Engineering, The University of Tokyo
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Hashimoto Kazuhito
Department of Applied Chemistry, The University of Tokyo:Hashimoto Light Energy Conversion Project, ERATO/JST:Research Center for Advanced Science and Technology, University of Tokyo
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Watanabe Kazuya
Hashimoto Light Energy Conversion Project, ERATO/JST:Research Center for Advanced Science and Technology, University of Tokyo:School of Life Sciences, Tokyo University of Pharmacy and Life Sciences
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