Figure 2.

Time versus current production (I_c) for a monolayer biofilm of S. oneidensis MR‐1 in an electrochemical system containing 10 mm lactate (a), and additionally 100 μm anthraquinone‐1‐sulfonate (α‐AQS; b), or 2 μm flavin mononucleotide (FMN; c). The arrow indicates the time of the addition of D₂O (solid line) or H₂O (dotted line). The data corresponding to the dotted line were normalized to the data point just prior to the addition of D₂O in the solid‐line data. d) The ratio of I_c before and 10 min after the addition of D₂O versus the D₂O concentration up to 4 % (v/v). The data are shown as the mean±standard error of the mean (n>3).