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. 2005 Aug;71(8):4414–4426. doi: 10.1128/AEM.71.8.4414-4426.2005

FIG. 3.

FIG. 3.

Biofilm formation on Fe-beads by S. oneidensis MR-1. (A) Inverted tubes showing clumping of inoculated Fe-beads after 24 h of incubation (left tube) and an uninoculated control (right tube). (B) Confocal microscopy image of an MR-1 microcolony on an Fe-bead surface after 3 days. Scale bar = 10 μm. The arrow indicates a microcolony. (C) Environmental scanning electron microscopy images of MR-1 biofilms on the Fe-bead surface. (Top panel) Fe-bead surface in the absence of bacteria; (middle panel) Fe-bead surface after 3 days of incubation with MR-1 cells (scale bar = 20 μm); (bottom panel) close-up of Fe-bead surface after 3 days of incubation with MR-1 cells (scale bar = 2 μm).