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Electron Acceptor-Dependent Respiratory and Physiological Stratifications in Biofilms

机译：生物膜中依赖电子受体的呼吸和生理分层

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摘要

Bacterial respiration is an essential driving force in biogeochemical cycling and bioremediation processes. Electron acceptors respired by bacteria often have solid and soluble forms that typically coexist in the environment. It is important to understand how sessile bacteria attached to solid electron acceptors respond to ambient soluble alternative electron acceptors. Microbial fuel cells (MFCs) provide a useful tool to investigate this interaction. In MFCs with Shewanella decolorationis, azo dye was used as an alternative electron acceptor in the anode chamber. Different respiration patterns were observed for biofilm and planktonic cells, with planktonic cells preferred to respire with azo dye while biofilm cells respired with both the anode and azo dye. The additional azo respiration dissipated the proton accumulation within the anode biofilm. There was a large redox potential gap between the bionlms and anode surface. Changing cathodic conditions caused immediate effects on the anode potential but not on the biofilm potential. Biofilm viability showed an inverse and respiration-dependent profile when respiring with only the anode or azo dye and was enhanced when respiring with both simultaneously. These results provide new insights into the bacterial respiration strategies in environments containing multiple electron acceptors and support an electron-hopping mechanism within Shewanella electrode-respiring biofilms.
机译：细菌呼吸是生物地球化学循环和生物修复过程中必不可少的驱动力。被细菌呼吸的电子受体通常具有固体和可溶性形式，通常在环境中共存。重要的是要了解附着在固体电子受体上的无柄细菌对周围可溶替代电子受体的反应。微生物燃料电池（MFC）提供了一种有用的工具来研究这种相互作用。在具有希瓦氏菌脱色的MFC中，偶氮染料被用作阳极室中的替代电子受体。对于生物膜和浮游细胞，观察到了不同的呼吸模式，其中浮游生物更喜欢用偶氮染料呼吸，而生物膜细胞则同时用阳极和偶氮染料呼吸。额外的偶氮呼吸消散了质子在阳极生物膜内的积累。薄膜与阳极表面之间存在较大的氧化还原电位间隙。阴极条件的变化对阳极电势产生直接影响，但对生物膜电势没有影响。当仅用阳极或偶氮染料进行呼吸时，生物膜的活力显示出与呼吸有关的逆向分布，而同时用两种染料呼吸时，生物膜的活力则得到增强。这些结果为包含多个电子受体的环境中的细菌呼吸策略提供了新见识，并支持希瓦氏菌电极呼吸生物膜内的电子跳跃机制。

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  • 来源
    《Environmental Science & Technology》 |2015年第1期|196-202|共7页
  • 作者

    Yonggang Yang; Yinbo Xiang; Guoping Sun; Wei-Min Wu; Meiying Xu;

  • 作者单位

    Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China 510070,State Key Laboratory of Applied Microbiology Southern China, Guangzhou, China 510070;

    State Key Laboratory of Applied Microbiology Southern China, Guangzhou, China 510070;

    Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China 510070,State Key Laboratory of Applied Microbiology Southern China, Guangzhou, China 510070;

    Department of Civil & Environmental Engineering, Center for Sustainable Development & Global Competitiveness, William and Cloy Codiga Resource Recovery Research Center, Stanford University, Stanford, California 94305-4020, United States;

    Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China 510070,State Key Laboratory of Applied Microbiology Southern China, Guangzhou, China 510070;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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