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Electron uptake occurs in M. barkeri with and without growth medium present at −450 mV. Comparison of current consumption in M. barkeri cells on poised electrodes. This includes experiments where (i) the growth medium was removed (washed culture), (ii) cells were added along with the growth medium (growth culture); or (iii) cells were washed to remove growth medium but no potential was poised on the electrode (open circuit).
