Differential dynamic microscopy of bacterial motility |
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| Authors: | Wilson L G Martinez V A Schwarz-Linek J Tailleur J Bryant G Pusey P N Poon W C K |
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| Affiliation: | SUPA and COSMIC, School of Physics & Astronomy, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom. |
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| Abstract: | We demonstrate a method for the fast, high-throughput characterization of the dynamics of active particles. Specifically, we measure the swimming speed distribution and motile cell fraction in Escherichia coli suspensions. By averaging over ～10(4) cells, our method is highly accurate compared to conventional tracking, yielding a routine tool for motility characterization. We find that the diffusivity of nonmotile cells is enhanced in proportion to the concentration of motile cells. |
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