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• W1468710178 abstract "Up to date a few electroactive bacteria embedded in biofilms are described to catalyze both anodic and cathodic reactions in bioelectrochemical systems (i.e. bidirectional electron transfer). How these bacteria transfer electrons to or from the electrode is still uncertain. In this study the extracellular electron transfer mechanism of bacteria within an electroactive biofilm was investigated by using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). First, a mature anodic electroactive biofilm was developed from an activated sludge sample (inoculum), acetate as electron donor and a poised electrode (+397mV vs. SHE). Later, this biofilm was switched to biocathodic conditions by feeding it with a medium containing nitrates and poising the electrode at -303mV vs. SHE. The electrochemical characterization indicated that both, acetate oxidation and nitrate reduction took place at a similar formal potential of -175±05 and -175±34mV vs. SHE, respectively. The biofilm was predominantly composed by Geobacter sp. at both experimental conditions. Taken together, the results indicated that both processes could be catalyzed by using the same electron conduit, and most likely by the same bacterial consortium. Hence, this study suggests that electroactive bacteria within biofilms could use the same electron transfer conduit for catalyzing anodic and cathodic reactions." @default.
• W1468710178 created "2016-06-24" @default.
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• W1468710178 date "2016-01-01" @default.
• W1468710178 modified "2023-10-18" @default.
• W1468710178 title "Bidirectional microbial electron transfer: Switching an acetate oxidizing biofilm to nitrate reducing conditions" @default.
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• W1468710178 doi "https://doi.org/10.1016/j.bios.2015.08.035" @default.
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• W1468710178 hasPublicationYear "2016" @default.
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