Figure 3

(a) The fluorescence image of Listeria cells collected by positive DEP at 5 MHz and 20 Vpp in a microfluidic channel with the interdigitated microelectrode at the channel floor (40 pairs of finger electrodes, 25 μm of electrode width and 25 μm of space, the channel was ~250 μm wide and 20 μm deep). Green dots are Listeria cells stained with DiOC₆(3). (b) The FESEM image of Listeria cells lined up between the edges of the finger electrodes in the microfluidic channel by positive DEP at 5 MHz and 20 Vpp.