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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: P5: Microswimmers, Active Liquids

CPP 33.7: Poster

Dienstag, 17. März 2015, 14:00–16:00, Poster C

Bacterial swimming in narrow spaces — •Marius Hintsche, Michael Raatz, Marco Bahrs, Matthias Theves, and Carsten Beta — Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany

The natural habitat of many bacterial swimmers is dominated by interfaces and narrow interstitial spacings. Thus, they will often interact with the fluid boundaries in their vicinity. To quantify these interactions, we investigated the swimming behavior of the soil bacterium Psudomonas putida in a variety of confined environments. We fabricated structured microchannels with different configurations of cylindrical obstacles as well as unstructured narrow chambers. In these environments we recorded swimming trajectories and measured key motility parameters for different obstacle densities and arrangements. Although the run-and-turn swimming pattern does not change, the shape of trajectories varies in different obstacle configurations. Motility parameters like speed, run times and turning angles depend strongly on the obstacle density. This is likely to be a combination of hydrodynamic wall effects and collisions with the obstacles.