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(Color online) Swarming Serratia marcescens and (b) instantaneous velocity field of swarming bacteria. Clear examples of translating streams and rotating vortices are delineated. The scale bars are .
(Color online) Phototactic control of a triangular microstructure: (a1) translation with the average velocity of before UV exposure, (a2) during exposure translation stops, (a3) after exposure translation fully resumes within , and (b1) rotation with the average angular velocity of on swarm plate before UV exposure; centroid follows path shown (b2) rotation stops during exposure and (b3) rotation fully resumes within after exposure. The scale bars are .
(Color online) triangular microstructure rotating in an open channel motility buffer; (a) rotational motion with and (b) coiled motion with . The scale bars are .
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