Fig. 1
From: Dynamics-dependent density distribution in active suspensions
Demonstration of spatial-resolved differential dynamic microscopy. Projecting light patterns onto a sample of light-powered E. coli AD10 (at OD = 1) leads to a spatial variation of the mean swimming speeds \(\bar v\). a Map of \(\bar v\) as measured by sDDM when the negative ‘UoE’ pattern shown in inset is projected onto the sample. b Phase contrast image about 20 s after applying the pattern, showing accumulation in the darker regions. Magenta lines indicate the square tiles of 64 pixels (90 μm) size used for the sDDM analysis
