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Electrical current generation in duplicate air-cathode MFCs fed with four different substrates. Duplicate MFCs (a, b or c) were operated with the external resistor described above the panels: (a) MFCs fed with acetate (AC-MFC); (b) MFCs fed with a mixture of butyrate and propionate (BP-MFC); (c) MFCs fed with glucose (GL-MFC); (d) MFCs fed with sucrose (SU-MFC). Arrows indicate anode biofilm sampling for DNA extraction and biomass determination.
