Figure 2.

Absorbance data from G. sulfurreducens producing 450 μA cm⁻², a stage at which the biofilm extends beyond 20 μm and growth slows significantly. A) Data are at potential intervals of 100 mV and in the presence of acetate. B) Data are from the same biofilm, exposed to the same potentials, in the absence of acetate. These experiments show that all cells were able to discharge electrons to the electrode.