Figure 2

(a) Optical microscope images (scale bar = 10 µm) of S. epidermidis (small dot indicated by yellow arrow) being drawn towards and pulled into a micropore (3 µm black circles): <1> the bacterium near (within 15 µm radius) the micropore is pulled in at a fast rate; <2> the trajectory of a distant bacterium being drawn towards the micropore until it is pulled in. (b) Actual display screen during the measurement. The moment at which the bacteria (yellow arrow) is being sucked into the micropore. Its waveform is denoted on the right top column of the right-side window. The waveforms are indicated at three different time scales using the waveform viewer software.