On Electron Transport through Geobacter Biofilms
On Electron Transport through Geobacter Biofilms
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DOI：
10.1002/cssc.201100748
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发表时间：
2012-06-01
期刊：
影响因子：
8.4
通讯作者：
Torres, Cesar I.
中科院分区：
文献类型：
--
作者：
Bond, Daniel R.;Strycharz-Glaven, Sarah M.;Torres, Cesar I.
地老虎属利用阳极作为末端呼吸电子受体，可在阳极表面形成20 μ m以上的生物膜。微生物如何通过厚的生物膜和穿过生物膜/阳极界面传输电子，以及是什么决定了生物膜厚度和催化活性的上限（即，电流、电子转移到阳极的速率）是吸引大量关注的基本问题。大量实验证据表明，电子从单个细胞通过与细胞外膜相关的细胞色素网络、细胞外聚合物内以及沿着皮利转移。在这里，我们描述了什么是已知的这个细胞外电子转移过程，称为电子超交换，其拟议的作用，在生物膜阳极呼吸。Superexchange能够解释许多不同类型的实验结果，以及Geolithic生物膜阳极可以实现的生物膜厚度和催化活性的上限。
Geobacter spp. can form a biofilm that is more than 20 mu m thick on an anode surface by utilizing the anode as a terminal respiratory electron acceptor. Just how microbes transport electrons through a thick biofilm and across the biofilm/anode interface, and what determines the upper limit to biofilm thickness and catalytic activity (i.e., current, the rate at which electrons are transferred to the anode), are fundamental questions attracting substantial attention. A significant body of experimental evidence suggests that electrons are transferred from individual cells through a network of cytochromes associated with cell outer membranes, within extracellular polymeric substances, and along pili. Here, we describe what is known about this extracellular electron transfer process, referred to as electron superexchange, and its proposed role in biofilm anode respiration. Superexchange is able to account for many different types of experimental results, as well as for the upper limit to biofilm thickness and catalytic activity that Geobacter biofilm anodes can achieve.