Berlin 2018 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 15: Postersession III

BP 15.102: Poster

Dienstag, 13. März 2018, 14:00–16:00, Poster B

Adhesion enhances bacterial diffusivity close to surfaces. — •Emiliano Perez Ipiña¹, Stefan Otte¹, Rodolphe Pontier-Bres², Dorota Czerucka², and Fernando Peruani¹ — ¹Université Côte d’Azur, Laboratoire J.A. Dieudonné, UMR 7351 CNRS, Parc Valrose, Nice F-06108, France — ²Centre Scientifique de Monaco (CSM), 8 Quai Antoine 1er, Monaco 98000, Principality of Monaco

It is well known that peritrichous bacteria are able to explore the space by performing “run and tumble” motion when they are far from surfaces. Moreover, bacteria regulate the frequency of tumbling to perform chemotaxis and redirect their motion towards favorable environments. However, close to a surface, hydrodynamics interactions become dominants and run and tumbling patterns are replaced by smooth circular trajectories. In this context, where bacteria are trapped in circles and tumbling is highly suppressed, it is not clear how they can be in control of their motion and by which mediums chemotaxis is performed. Here, through mathematical modeling and statistical analysis of recorded trajectories, we characterize the motility patterns of Escherichia coli close to surfaces in in vitro experiments. We report that by adhering to the surface, E. coli is able to break the circular trajectories and get in control of their diffusivity. Remarkably, we found that E. coli was tuned to maximize its diffusion coefficient. Our results shed light on the explore strategies followed by bacteria near surfaces and suggest adhesion as a possible chemotactic mechanism.