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Selective trapping of E. coli (green) from 1 μm beads (red) with a fluid flow rate of 400 μL/h. (a) No applied voltage; (b) 400 Vp-p at 300 kHz is applied for 30 s; (c) voltage is turned off and the concentrated bacteria is released; (d) after trapped bacteria are released, none remaina on the microposts
