Dynamics of bacteria scanning a porous environment

Abstract

It has recently been reported that bacteria, such as E.coli and P. putida, perform distinct modes of motion when placed in porous media as compared to dilute regions or free space. This has led us to suggest an efficient strategy for active particles in a disordered environment: reorientations are suppressed in locally dilute regions and intensified in locally dense ones. Thereby the local geometry determines the optimal path of the active agent and substantially accelerates the dynamics for up to two orders of magnitude. We observe a non-monotonic behavior of the diffusion coefficient in dependence on the tumbling rate and identify a localisation transition, either by increasing the density of obstacles or by decreasing the reorientation rate.

arXiv comment5 pages, 5 figure. Movies can be accessed via: phi_obs0.4-sigmoid.webm: see https://nxcloud.omid.land/s/iDkDYGHwjczpZg9 phi_obs0.6-sigmoid.webm: see https://nxcloud.omid.land/s/eJQo8btyWQZ9nrA phi_obs0.4-uniform.webm: see https://nxcloud.omid.land/s/Fnp7cpGnm8JYqxX phi_obs0.6-uniform.webm: see https://nxcloud.omid.land/s/cBMgtL5QfYiXWZD

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Cited by in corpus (11)

• Chiral Active Particles are Sensitive Reporter to Environmental Geometry
• Glassy Dynamics in Chiral Fluids
• Microbes in porous environments: From active interactions to emergent feedback
• Active Brownian Particles in Random and Porous Environments
• Active Dynamics of Linear Chains and Rings in Porous Media
• Optimal motility strategies for self-propelled agents to explore porous media
• The role of tumbling in bacterial scattering at convex obstacles
• Escape dynamics of confined undulating worms
• Collective dynamics of active dumbbells near a circular obstacle
• Time-dependent properties of run-and-tumble particles: Density relaxation
• Optimal run-and-tumble in slit-like confinement