Figure 5

Flagella mediated physical interactions between P. vortex bacteria. (A) Snapshots from a video clip of a branch of a P. vortex colony moving on Mueller-Hinton agar (0.3% w/v) (x50 magnification, scale bar 200 μm) towards a target of extracellular material (dark spot). See Movies S4-S5 and [14] for more details. (B-D) Scanning electron microscope (SEM) pictures of bacteria close to the center of the vortex. Scale bar in (B) is 4 μm and in (C) is 1 μm. The bacteria in (D) are around 400 nm wide and the flagella are 20 to 35 nm wide.