Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, 60 Nanyang Drive, 637551, Singapore.
Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, 60 Nanyang Drive, 637551, Singapore; School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459, Singapore.
Bioresour Technol. 2018 Jun;258:354-364. doi: 10.1016/j.biortech.2018.02.073. Epub 2018 Feb 20.
Electroactivity appears to be a phylogenetically diverse trait independent of cell wall classification, with both Gram-negative and Gram-positive electricigens reported. While numerous electricigens have been observed, the majority of research focuses on a select group of highly electroactive species. Under favorable conditions, many microorganisms can be considered electroactive, either through their own mechanisms or exogenously-added mediators, producing a weak current. Such microbes should not be dismissed based on their modest electroactivity. Rather, they may be key to understanding what drives extracellular electron transfer in response to transient limitations of electron acceptor or donor, with implications for the study of pathogens and industrial bioprocesses. Due to their low electroactivity, such populations are difficult to grow in bioelectrochemical systems and characterise with electrochemistry. Here, a critical review of recent research on weak electricigens is provided, with a focus on the methodology and the overall relevance to microbial ecology and bioelectrochemical systems.
电活性似乎是一种与细胞壁分类无关的、具有系统发育多样性的特征，已报道了革兰氏阴性菌和革兰氏阳性菌的电产生菌。虽然已经观察到许多电产生菌，但大多数研究都集中在少数几种具有高度电活性的物种上。在有利条件下，许多微生物可以通过自身的机制或外加的介体被认为是电活性的，从而产生弱电流。不应该仅仅因为这些微生物的电活性较弱就忽视它们。相反，它们可能是理解在电子受体或供体的短暂限制下，细胞外电子转移是如何发生的关键，这对病原体和工业生物过程的研究具有重要意义。由于其电活性较低，此类种群在生物电化学系统中难以生长，并且难以用电化学方法进行表征。在这里，对近期关于弱电产生菌的研究进行了批判性回顾，重点介绍了该方法以及其对微生物生态学和生物电化学系统的整体相关性。
