Fig. 1: Transmission electron microscopy of anode-grown G. sulfurreducens.

Plunge frozen, freeze substituted plastic embedded TEM micrographs of G. sulfurreducens collected from an anode biofilm poised at −0.07 V vs. SHE. ICM structures present as parallel bands in one area of a cell. a, c, and e show ICM in cells sliced perpendicular to the major axis, while b, d, and f show ICM in cells sliced parallel to the major axis where the ICM is located near the tip of the cell. Micrographs were collected on an FEI TF20. Scale bars: 100 nm.