| Project/Area Number |
23241012
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
SAYAMA Mikio 独立行政法人産業技術総合研究所, 環境管理技術研究部門, 主任研究員 (20344145)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAJIMA Yoshito 独立行政法人産業技術総合研究所, 地圏資源環境研究部門, 主任研究員 (80357623)
鳥村 政基 独立行政法人産業技術総合研究所, 環境管理技術研究部門, 計測技術研究グループ長 (40357588)
佐藤 浩昭 独立行政法人産業技術総合研究所, 環境管理技術研究部門, 主任研究員 (70357143)
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| Research Collaborator |
NIELSEN Lars Peter Microbiology Aarhus University, Denmark, Microbial Ecology Department of Bioscience, Professor
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥49,400,000 (Direct Cost: ¥38,000,000、Indirect Cost: ¥11,400,000)
Fiscal Year 2013: ¥12,740,000 (Direct Cost: ¥9,800,000、Indirect Cost: ¥2,940,000)
Fiscal Year 2012: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Fiscal Year 2011: ¥22,750,000 (Direct Cost: ¥17,500,000、Indirect Cost: ¥5,250,000)
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| Keywords | 細胞外電子伝達 / 酸化還元反応 / 堆積物 / 物質循環 / 微生物 / 国際研究者交流（デンマーク） |
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| Research Abstract |
Biogeochemical element cycling under natural environments consists cascades of oxidation-reduction processes. The concept that spatially segregated (mm to cm scale) oxidation&-reduction reactions can be coupled by electric currents in nature are now to be widely supported, but still no firm evidence exist to verify it under in situ conditions. We have developed a novel microsensor that is able to measure electric potential (EP) at micrometer and microvolt scales, and got significant positive in situ EP-microporfiles at the sediment surface in Tokyo Bay. There may be two mechanisms contributing for the long distance electron transfer in Tokyo Bay sediment, one is conductive mineral nanoparticles (magnetite) and the other is conductive filamentous bacteria (Desulfobulbaceae). Magnetite can transfer electrons through solid state cycling of structural Fe2+ and Fe3+. The filamentous bacteria contain strings with distinct properties in accordance with a function as electron transporters.
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