Regensburg 2022 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 46: Poster Session: Complex Fluids, Soft Matter, Active Matter, Glasses and Granular Materials
DY 46.12: Poster
Donnerstag, 8. September 2022, 15:00–18:00, P2
Bacterial swimmers' motility under external and light-induced flows — •Valeriia Muraveva1, 2, Robert Großmann1, Marek Bekir2, Svetlana Santer2, and Carsten Beta1 — 1Biological Physics, University of Potsdam, Potsdam, Germany — 2Smart Soft Matter, University of Potsdam, Potsdam, Germany
We report on changes in the swimming strategy of rod-shaped bacteria under flow conditions.
To swim bacteria utilise lash-like organelles on the cell body, flagella. The model organism for this study is the soil bacterium Pseudomonas putida, which has a rod-shaped body and multiple flagella located at one pole of the cell, so they can act in concert to drive the bacterium in a single direction. The strategy of switching between different swimming modes in bulk was well described. Here, we study the cells' locomotion strategy under flow to better understand the processes of infection spreading and biofilm formation in a natural environment.
To create shear stress conditions hydrodynamic flows are used. For varying the geometry of flow patterns on the micron-scale we also use light-induced flow technics (in particular thermo-osmosis on a gold surface) to create flow locally and to advect or trap swimming bacteria.
To analyse the well-known "run-and-turn" strategy, we concentrate on characteristic features of the swimming pattern: changes in the run-time and turn angle distributions. We also study mutant cell lines under flow (cells with partial or total deficiency in motor function) to elucidate the role of the different components of the motility apparatus in this process.