Geobacter species generate the highest current densities of any known microorganisms; are often the predominant microorganisms that naturally colonize the anodes of high-current-density, high-columbic-efficiency microbial fuel cells; and are effective in oxidizing organic contaminants with an electrode serving as the electron acceptor. Geobacter species can also reduce a diversity of contaminants and other electron acceptors with an electrode serving as an electron donor. A series of studies with Geobacter sulfurreducens including: adaptive evolution coupled with genome resequencing; microarray and real-time analysis of gene expression; genetic manipulation of gene expression; genome-scale metabolic modeling; and electrochemical analyses have suggested a model for long-range electron transfer through conductive anode biofilms. Similar approaches indicate that electron transfer in the reverse direction from electrodes to the cells proceeds through differentmechanisms. These findings have important implications not only for the design of microbial fuel cells but also for a number of emerging bioelectronic applications.

Give and take of <i>Geobacter </i>microbe-electrode interactions

239th National Meeting (2010)

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Give and take of Geobacter microbe-electrode interactions