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. Author manuscript; available in PMC: 2014 Aug 3.
Published in final edited form as: Phys Rev Lett. 2010 Apr 22;104(16):168102. doi: 10.1103/PhysRevLett.104.168102

FIG. 1.

FIG. 1

(a) Fluorescence micrograph of individual cells (labeled green) inside the microchannel. Cell traps, where the rectification bias is reversed, have a higher concentration of cells. (b) False-color image showing the number of cells in each chamber as a function of time. Note that three spontaneously forming migrating bands of bacteria are observed, launching at T = 0, 2, and 4 h, and that the first one is scattered back after it reaches the end of the microchannel (between T = 4 and T = 6 h).