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G. sulfurreducens biofilm structure is fully developed as the current density plateau is reached. Current density generation (A) and transmission electron microscopy image (B) of G. sulfurreducens biofilms. Cells were inoculated at time 0 on anodes poised at +240 mV. After 83 h of growth (arrow), normal growth medium was exchanged with stable isotope-labeled medium or unlabeled medium as a control.
