Fig. 4

A Chronoamperometric curves of the three-electrode system inoculated with co-culture with medium I (curve a), Geobacter sulfurreducens PCA with medium I (curve b), co-culture without a carbon source (curve c) and co-culture with supernatant of medium I (curve d) at a constant potential of 0.3 V. The arrows indicate the replacement of the solution in the reactor with the same carbon source. B Concentrations of total soluble sugars, reducing sugars and acetic acid in the supernatant of medium I and medium III