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Int. J. Mol. Sci. 2017, 18(1), 108;

Influence of Anode Potentials on Current Generation and Extracellular Electron Transfer Paths of Geobacter Species

Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2-17-2-1 Tsukisamu-Higashi, Toyohira-ku, Sapporo, Hokkaido 062-8517, Japan
Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo, Hokkaido 060-8589, Japan
Academic Editors: Deepak Pant and Andrea Schievano
Received: 1 November 2016 / Revised: 28 December 2016 / Accepted: 4 January 2017 / Published: 6 January 2017
(This article belongs to the Special Issue Bioelectrochemical Systems)
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Geobacter species are capable of utilizing solid-state compounds, including anodic electrodes, as electron acceptors of respiration via extracellular electron transfer (EET) and have attracted considerable attention for their crucial role as biocatalysts of bioelectrochemical systems (BES’s). Recent studies disclosed that anode potentials affect power output and anodic microbial communities, including selection of dominant Geobacter species, in various BES’s. However, the details in current-generating properties and responses to anode potentials have been investigated only for a model species, namely Geobacter sulfurreducens. In this study, the effects of anode potentials on the current generation and the EET paths were investigated by cultivating six Geobacter species with different anode potentials, followed by electrochemical analyses. The electrochemical cultivation demonstrated that the G. metallireducens clade species (G. sulfurreducens and G. metallireducens) constantly generate high current densities at a wide range of anode potentials (≥−0.3 or −0.2 V vs. Ag/AgCl), while the subsurface clades species (G. daltonii, G. bemidjensis, G. chapellei, and G. pelophilus) generate a relatively large current only at limited potential regions (−0.1 to −0.3 V vs. Ag/AgCl). The linear sweep voltammetry analyses indicated that the G. metallireducens clade species utilize only one EET path irrespective of the anode potentials, while the subsurface clades species utilize multiple EET paths, which can be optimized depending on the anode potentials. These results clearly demonstrate that the response features to anode potentials are divergent among species (or clades) of Geobacter. View Full-Text
Keywords: Geobacter; current generation; anode potential; electrochemistry; microbial fuel cells Geobacter; current generation; anode potential; electrochemistry; microbial fuel cells

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Kato, S. Influence of Anode Potentials on Current Generation and Extracellular Electron Transfer Paths of Geobacter Species. Int. J. Mol. Sci. 2017, 18, 108.

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