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  • Title: Fluctuations and rheology in active bacterial suspensions.
    Author: Chen DT, Lau AW, Hough LA, Islam MF, Goulian M, Lubensky TC, Yodh AG.
    Journal: Phys Rev Lett; 2007 Oct 05; 99(14):148302. PubMed ID: 17930729.
    Abstract:
    We probe nonequilibrium properties of an active bacterial bath through measurements of correlations of passive tracer particles and the response function of a driven, optically trapped tracer. These measurements demonstrate violation of the fluctuation-dissipation theorem and enable us to extract the power spectrum of the active stress fluctuations. In some cases, we observe 1/sqrt[omega] scaling in the noise spectrum which we show can be derived from a theoretical model incorporating coupled stress, orientation, and concentration fluctuations of the bacteria.
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