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Current generation and metabolite concentrations in cocultures of P. carbinolicus and a G. sulfurreducens strain with the uptake hydrogenase gene deleted (A) or wild-type G. sulfurreducens (B). The anode was poised at +300 mV with a potentiostat. Cultures were initiated with vigorous sparging in order to remove hydrogen produced as outlined in the text. Time courses are shown after the sparging was stopped on day 1.
