Figure 2. Current production of Geobacter sulfurreducens.

A. Current production time courses of wild type G. sulfurreducens grown entirely as current harvesting (arrow indicates the switch from original feed of 10 mM acetate to continual feed) and current production time course of fully grown fumarate control biofilms switched to current harvesting of wild type G. sulfurreducens. These data are representative time courses for multiple replicates of each treatment. B–C. Confocal scanning laser microscopy images of fumarate control swapped to current harvesting biofilms of G. sulfurreducens . Metabolically active (green) and inactive (red) cells where differentiated with a LIVE/DEAD kit based on the permeability of the cell membrane. B. 3-D projection, top view; C. slices through biofilm parallel to electrode large panel and perpendicular to electrode top and side panel.