FIG. 1.

Numbers of gltA, recA, rpoD, and proC transcripts expressed by G. sulfurreducens grown in chemostats under Fe(III)-reducing conditions (A) and on a current-harvesting electrode poised at +500 mV (in reference to a standard H₂ electrode) (B). Each chemostat point is the average of five replicates from three separate chemostat cultures. RNAs were extracted from the electrode at 0.5 mA, 0.75 mA, 1.0 mA, 1.2 mA, 1.45 mA, and 2 mA of current, and each point is the average of triplicate determinations.