Differential Dynamic Microscopy of Bacterial Motility

Details Differential Dynamic Microscopy of Bacterial Motility Differential Dynamic Microscopy of Bacterial Motility

2010-04-27

arxiv.org/abs/1004.4764v2

Phys. Rev. Lett. 106, 018101 (2011)

Biology

Quantitative Biology

Quantitative Methods

4 pages, 4 figures. In this updated version we have added simulations to support our interpretation, and changed the model for

Scientific paper

10.1103/PhysRevLett.106.018101

We demonstrate 'differential dynamic microscopy' (DDM) for the fast, high throughput characterization of the dynamics of active particles. Specifically, we characterize the swimming speed distribution and the fraction of motile cells in suspensions of Escherichia coli bacteria. By averaging over ~10^4 cells, our results are highly accurate compared to conventional tracking. The diffusivity of non-motile cells is enhanced by an amount proportional to the concentration of motile cells.

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