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Differential Dynamic Microscopy: a High-Throughput Method for Characterizing the Motility of Microorganisms

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Publication details

JournalBiophysical Journal
DatePublished - 17 Oct 2012
Issue number8
Volume103
Number of pages11
Pages (from-to)1637–1647
Original languageEnglish

Abstract

We present a fast, high-throughput method for characterizing the motility of microorganisms in three dimensions based on standard imaging microscopy. Instead of tracking individual cells, we analyze the spatiotemporal fluctuations of the intensity in the sample from time-lapse images and obtain the intermediate scattering function of the system. We demonstrate our method on two different types of microorganisms: the bacterium Escherichia coli (both smooth swimming and wild type) and the biflagellate alga Chlamydomonas reinhardtii. We validate the methodology using computer simulations and particle tracking. From the intermediate scattering function, we are able to extract the swimming speed distribution, fraction of motile cells, and diffusivity for E. coli, and the swimming speed distribution, and amplitude and frequency of the oscillatory dynamics for C. reinhardtii. In both cases, the motility parameters were averaged over ∼10(4) cells and obtained in a few minutes.

Bibliographical note

Copyright © 2012 Biophysical Society. Published by Elsevier Inc. All rights reserved.

    Research areas

  • Cell Tracking, Chlamydomonas reinhardtii, Escherichia coli, Light, Locomotion, Microscopy, Scattering, Radiation

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