Fig 4.

Current production by the DL100 (Wt) and the short-isoform (pilA4) strains in microbial fuel cells. (A) Plot representative of data obtained with three biological replicates. The ΔpilA strain produces a maximum current of 1.2 mA under the same experimental conditions (45). (B) Confocal scanning micrographs of biofilms formed with the isogenic wild-type DL100 (Wt) and short-isoform (pilA4) strains on graphite anodes producing maximum current for 3 days in microbial fuel cells. Cross-sectional (top) and top-down (bottom) views are shown. Scale bars, 250 μm.