4–6 Oct 2023
Biozentrum, University of Würzburg
Europe/Berlin timezone

Anomalous bacterial transport in confined geometries

Not scheduled
20m
Room A101 (Biozentrum, University of Würzburg)

Room A101

Biozentrum, University of Würzburg

Am Hubland
Poster

Speaker

Prof. Eric CLEMENT (ESPCI)

Description

Motile bacteria are known to interact with flows exhibiting in the bulk active Betherton-Jeffery trajectories or rheotactic drift due to the helical flagella shapes. In the vicinity of bound- ing surfaces, one also observes specific trajectories including persistent upstream swimming, an effect enhanced by the presence of edges. Statistically, the combination of hydrodynamic interactions and flow-induced orientation, leads to a strong density increase in the surface vicinity, inducing a boundary layer of around 10𝜇𝑚 in extension. In disordered and complex environments, the presence of surface and flow make large-scale dispersion properties of active bacteria a challenging issue.
Based on the previous study, here we developed experimental model systems suited to observe individual trajectories and to assess the emerging dispersion processes in funnel-shape microfluidic device(figure(a)) varying the flow velocity using motile bacteria. We found: (1) a sharp density increases downstream close to surfaces at the same shear rate as in previous work(figure(a)); (2) the concentration difference indicator (𝐼𝑝1) increase with time and then reach a steady state. This work will help to understand the role of flow on the transport of motile bacteria, in the presence of geometrically complex surfaces and surface.

Primary author

Peixin Zhang (PMMH, ESPCI)

Co-authors

Anke Lindner (PMMH - ESPCI) Prof. Eric CLEMENT (ESPCI)

Presentation materials

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