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Electrical current generation in duplicate sucrose-fed SP reactors controlled to three different anode potentials. Duplicate SP reactors (a or b) were operated by controlling anode potential to +100 mV vs SHE (SP-H, panel a), −50 mV vs SHE (SP-M, panel b) and −200 mV vs SHE (SP-L, panel c). Arrows indicate anode biofilm sampling for DNA extraction and biomass determination.
