Motility of \textit{Escherichia coli} in a quasi-two-dimensional porous medium

Abstract

Bacterial migration through confined spaces is critical for several phenomena like: biofilm formation, bacterial transport in soils, and bacterial therapy against cancer . In the present work, \textit{E. coli} (strain K12-MG1655 WT) motility was characterized by recording and analyzing individual bacterium trajectories in a simulated quasi-2-dimensional porous medium. The porous medium was simulated by enclosing, between slide and cover slip, a bacterial-culture sample mixed with uniform 2.98 $\mu m$ spherical latex particles. The porosity of the medium was controlled by changing the latex particle concentration. By statistically analyzing trajectory parameters like: instantaneous velocity and turn angle, as well as mean squared displacement, we were able to quantify the effects that different latex particle concentrations have upon bacterial motility. To better understand our results, bacterial trajectories were simulated by means of a phenomenological random-walk model (developed ad hoc), and the simulated results were compared with the experimental ones.

9 pages, Sumbnited to PRE

References in corpus (11)

• Hydrodynamic attraction of swimming microorganisms by surfaces
• Fluid dynamics and noise in bacterial cell-cell and cell-surface scattering
• Direct measurement of the flow field around swimming microorganisms
• Fluid Flows Created by Swimming Bacteria Drive Self-Organization in Confined Suspensions
• Hydrodynamic capture of microswimmers into sphere-bound orbits
• Rectification of Swimming Bacteria and Self Driven Particle Systems by Arrays of Asymmetric Barriers
• Geometric capture and escape of a microswimmer colliding with an obstacle
• Non-Gaussian statistics for the motion of self-propelled Janus particles: experiment versus theory
• Influence of swimming strategy on microorganism separation by asymmetric obstacles
• Escape Kinetics of Self-Propelled Janus Particles from a Cavity: Numerical Simulations
• Polar features in the flagellar propulsion of E. coli bacteria

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• Single-species fragmentation: the role of density-dependent feedbacks
• Pulsed interactions unify reaction-diffusion and spatial nonlocal models for biological pattern formation
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