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Wednesday, 15th, December 2021
From 11h30 To 12h30
Centre de recherche - Paris - Amphithéâtre Marie Curie

Bacterial swarming, a model for expanding active matter

Bacteria are often associated with surfaces where they can develop multi-cellular communities. Migration away from a dense community is part of the natural history of the bacterial world. This process poses significant medical challenges because it leads to the spread of chronic infections. Thus, it is important to better understand the physical processes that control bacterial dispersal. 
Bacterial swarming, the ability for a bacterial colony to spread across hydrogel surfaces, is a collective behavior. Beyond biological relevance, it is an exquisite experimental model system to study multiscale morphogenesis. One Pseudomonas aeruginosa cell is 2 microns in length and a colony can cover a 10 cm diameter Petri dish in 24h. Its typical division time is 1 hour, and its swimming speed is 50 microns/h. All in all, it takes 5 orders of magnitude in length and time to fully grasp the physics of colony expansion.
I will describe the experimental system, from single-cell swimming dynamics to a variety of collective motile behaviors at play in a P. aeruginosa swarming colony, from 2D active solid to 3D active turbulence. Finally, I will give one example of how swarming behavior can be used to answer questions in ecology and evolution.

Hybrid seminar in Amphithéâtre Marie Curie (sanitary pass required) and on TEAMS


Maxime Deforet

Laboratoire Jean Perrin, Sorbonne Université, CNRS

Invited by

Karine Guevorkian


Karine Guevorkian

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