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Home page > Seminars > Séminaires théorie > Theory Club Wednesday September 11 at 12:00pm in room 646A. Yongfeng Zhao: "Spreading of run-and-tumble bacteria in complex environments".

Theory Club Wednesday September 11 at 12:00pm in room 646A. Yongfeng Zhao: "Spreading of run-and-tumble bacteria in complex environments"

Unless otherwise stated, seminars and defences take place at 11:30 in room 454A of Condorcet building.


Spreading of run-and-tumble bacteria in complex environments

Yongfeng Zhao

Abstract: The spreading of bacterial colonies typically relies on both cell division and motility. The simplest of models for such behaviours is the FKPP equation, which predicts ballistic propagation of the colony front. This model however neglects the nonequilibrium nature of cellular motion and fails to capture the influence of complex environments, such as porous media, on the latter [1]. In this talk, starting from a simple lattice model of run-and-tumble bacteria, I will show how to obtain a FKPP-like equation for a proliferating colony and derive the speed of the corresponding Fisher wave.

Then I will show how random obstacles impact the speed of the wave in a non-trivial way, without altering the ballistic spreading of the colony. In particular, I will show how our results allow us to account for experiments in which colonies of E. coli spread in soft agar gel.

[1] T Bertrand, Y Zhao, O Bénichou, J Tailleur, R Voituriez, Optimized Diffusion of Run-and-Tumble Particles in Crowded Environments, Physical Review Letters 120, 198103 (2018).

Wednesday September 11 at 12:00pm in room 646A


Contact : Équipe séminaires / Seminar team - Published on / Publié le 3 September


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