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電流は,海洋沈殿物の空間的に分離された生地化学的プロセスを結合させます
Lars Peter Nielsen1, Nils Risgaard-Petersen, Henrik Fossing
1Department of Biological Sciences, Aarhus University, Ny Munkegade 114, DK-8000 Aarhus C, Denmark. biolpn@biology.au.dk
Nature
|February 26, 2010
まとめ
堆積物中の電流は,表面酸素の使用を深層硫黄と炭素酸化と結びつける. この微生物の電気通信は,自然の新しい生地化学的プロセスを明らかにします.
科学分野:
- 微生物生態学 微生物生態学とは
- バイオジオケミストリー バイオジオケミストリー
- 環境科学 環境科学
背景:
- 細菌は栄養循環のために細胞外電子移転 (EET) を行うことができます.
- EETがマイクロメートルスケールを超えた生地化学プロセスを結合させる証拠は存在しなかった.
研究 の 目的:
- 電気電流が自然環境における空間的に分離された生地化学的過程をカップル化するかどうかを調査する.
- 微生物の電気通信を深層の堆積層で実証する.
主な方法:
- 表面上の酸素濃度が変化している状態で,デフォントされた堆積物を研究した.
- 堆積物内の硫化水素とpHの変化を測定した.
- 酸素消費量に関する質量バランスの計算を行いました.
主要な成果:
- 電流は,表面の酸素消費を,深層の硫化物と有機炭素の酸化と急速に結びつけました.
- 堆積物全体の酸素消費の40%以上は,導かれた電子によって引き起こされた.
- オキシゾーンで顕著なpHピークが観測され,電気化学的過程の兆候である.
結論:
- 微生物のナノワイヤーや他の成分によって導かれる電気電流は,沈殿物の遠くの生地化学的プロセスを組み合わせます.
- この電気通信は,微生物の生態学と生地化学の循環に関する理解を広げています.
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