Figure 2.
Trapping efficiency for motile bacteria. Motile bacteria were applied to the main channel. A time-lapse image of the side channels was recorded. (a) Overlay of multiple time points of brightfield images. Bacteria are shown in black. Blunt arrows denote the start of the trajectories and pointed arrows denote the direction of swimming. Total time, 2.5 s; scale bar, 25 μm. (b) Typical image of a side channel after 20 min. (c) Spatiotemporal dynamics of the concentration gradient of swimming bacteria. fc denotes the fraction of bacteria residing within the heart-shaped chamber shown on the right side of the graph. To see this figure in color, go online.