Fig. 2
From: Chemotactic behaviour of Escherichia coli at high cell density
Collective motion in bacterial suspensions. a Typical snapshot of the velocity field measured in a high-density cell suspension (\({\Phi }_{{\rm{c}}}=0.08\), cell length \(L=2\ \upmu\)m, channel height \(h=50\ \upmu\)m). b Flow structure factor \(E(q)\) for increasing cell densities at the indicated values of channel height and cell length. c Amplitude of the peak, corrected for the low-density value, \(\Delta E({q}_{{\rm{str}}})\) as a function of cell density in the different experimental conditions. Each point is the median, and associated error bar the standard error of the mean (SEM) of 8 measurements, binned according to cell density. Inset: \(\pi /{q}_{{\rm{str}}}\) as a function of channel height. Dashed line indicates equality.
