FIG. 2.

Comparison of current generation, ethanol consumption, and acetate production in fuel cells with sterile control plus ethanol (A), P. carbinolicus plus ethanol (B), G. sulfurreducens grown with acetate until day 16 and then fed with ethanol (EtOH) (C), and a coculture of P. carbinolicus and G. sulfurreducens fed with ethanol (D). In panels C and D, G. sulfurreducens was grown with acetate in the fuel cell until current production was stable and then media were exchanged (acetate was omitted, and ethanol or ethanol and P. carbinolicus were added).