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Anode Biofilm Transcriptomics Reveals Outer Surface Components Essential For High Density Current Production In Geobacter Sulfurreducens Fuel Cells, Derek Lovley, Kelly P. Nevin, Byoung-Chan Kim, Richard H. Glaven, Jessica P. Johnson, Trevor L. Woodard, Barbara A. Methѐ, Raymond J. Didonato Jr., Sean F. Covalla, Ashley E. Franks, Anna Liu
Anode Biofilm Transcriptomics Reveals Outer Surface Components Essential For High Density Current Production In Geobacter Sulfurreducens Fuel Cells, Derek Lovley, Kelly P. Nevin, Byoung-Chan Kim, Richard H. Glaven, Jessica P. Johnson, Trevor L. Woodard, Barbara A. Methѐ, Raymond J. Didonato Jr., Sean F. Covalla, Ashley E. Franks, Anna Liu
Kelly Nevin
The mechanisms by which Geobacter sulfurreducens transfers electrons through relatively thick (>50 µm) biofilms to electrodes acting as a sole electron acceptor were investigated. Biofilms of Geobacter sulfurreducens were grown either in flow-through systems with graphite anodes as the electron acceptor or on the same graphite surface, but with fumarate as the sole electron acceptor. Fumarate-grown biofilms were not immediately capable of significant current production, suggesting substantial physiological differences from current-producing biofilms. Microarray analysis revealed 13 genes in current-harvesting biofilms that had significantly higher transcript levels. The greatest increases were for pilA, the gene immediately downstream of pilA, and …