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- W2048357807 abstract "Present concerns about the depletion of natural resources have encouraged studies to exploit microbial ingenuity to harness renewable sources of energy.1 Microbes have evolved diverse metabolic processes to inhabit a broad range of natural environments and can performmost chemical reactions that are thermodynamically possible to generate energy. In anaerobic environments, such as soils, sediments, and the deep sea, some microbes employ a unique metabolic strategy to respire on the surface of iron-based minerals.2 Metal-reducing bacteria possess a significant quantity of c-type cytochromes (c-Cyts) in their outer membrane (OM) and transfer electrons to the attached Fe(III) oxides during metabolism: see Figure 1(a). These bacteria produce pilus-like appendages—called bacterial nanowires, several tens of microns long—that are thought to transport electrons to Fe(III) oxides located at relatively long distances from the cell surface. Using extracellular metal oxides for respiration is essential to eliminate excess electrons generated by the oxidation of organic matter, which would otherwise inhibit energy production. The significance of this unique microbial metabolic strategy in anaerobic ecosystems has been argued extensively.2 Recent reports demonstrated that metal-reducing bacteria can also use various artificial solid materials such as graphite, gold, and indium-tin-oxide (ITO) electrodes as a terminal-electron acceptor.3 This important result highlights the potential to harvest electricity by collecting waste electrons from bacteria through the electrode in microbial fuel cells (MFCs), a type of electrochemical fuel cell. A great deal of research has focused on identifying the OM proteins responsible for extracellular electron transfer and improving the MFC power density. However, the specific mechaFigure 1. (a) Bacterial extracellular electron transfer mediated by outer membrane c-type cytochromes (OM c-Cyts). (b) Cyclic voltammetry of Shewanella loihica in the absence (trace 1) and presence (trace 2) of α-Fe2O3 colloids, the α-Fe2O3 colloidal solution lacking cells (trace 3), and the cell-free supernatant (trace 4). SHE: Standard hydrogen electrode. (c) Proposed model for the bacterial electron-transfer process mediated byα-Fe2O3. V.B, C.B: Valence, conduction bands." @default.
- W2048357807 created "2016-06-24" @default.
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- W2048357807 date "2009-01-01" @default.
- W2048357807 modified "2023-10-05" @default.
- W2048357807 title "Harnessing self-organizing bacterial networks for microbial fuel cells" @default.
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- W2048357807 doi "https://doi.org/10.1117/2.1200901.1477" @default.
- W2048357807 hasPublicationYear "2009" @default.
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