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DY: Fachverband Dynamik und Statistische Physik

DY 27: Fluid Physics 3 - organized by Stephan Weiss and Michael Wilczek (Göttingen)

DY 27.9: Vortrag

Dienstag, 23. März 2021, 16:50–17:10, DYa

Rectified Diffusion of E. coli in Microfluidic Labyrinths — •Ariane Weber1,2,3, Marco Bahrs4, Zahra Alirezaeizanjani4, Xingyu Zhang1,2, Carsten Beta4, and Vasily Zaburdaev1,21Department Biologie, Friedrich-Alexander-Universität Erlangen-Nürnberg — 2Max-Planck-Zentrum für Physik und Medizin, Erlangen — 3Max-Planck-Institut für Menschheitsgeschichte, Jena — 4Institut für Physik und Astronomie, Universität Potsdam

In many natural environments such as tissue or soil, bacteria have to orient through and interact with complex surroundings. To describe the bacterial dispersal in such environments, the movement of bacteria in the presence of spatial restrictions has to be understood qualitatively and quantitatively. In the present work, we take a first step in this direction by studying the spreading of E. coli in labyrinths of square and hexagonal geometry, both experimentally and theoretically. Using a microscopic tracking system, we first generate experimental data quantifying the dispersal of the bacteria in quasi-two-dimensional microfluidic labyrinths. Second, we formulate a two-dimensional random walk model of the bacterial movement within the labyrinths to (i) find theoretical expressions quantifying the diffusive motion and (ii) produce numerical results by implementing it in computer simulations. We then verify the analytical results by comparing them with the simulation statistics and the experimental data. Taken together, we are able to quantify the bacterial dispersal on short time scales and model it on large time scales, predicting faster dispersal and a prolonged time of non-Gaussian diffusion within the labyrinths.

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