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Combining Fluidic Devices with Microscopy and Flow Cytometry to Study Microbial Transport in Porous Media Across Spatial Scales

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Dynamics of Bacteria Scanning a Porous Environment.

Ehsan Irani¹, Zahra Mokhtari², Annette Zippelius³

¹Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), The Berlin Institute for Medical Systems Biology (BIMSB), 10115 Berlin, Germany.

Physical Review Letters

|April 27, 2022

Summary

This summary is machine-generated.

Bacteria exhibit unique motion in porous environments. Suppressing reorientation in dilute areas and intensifying it in dense areas significantly speeds up bacterial movement and dynamics.

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Area of Science:

Microbiology
Biophysics
Statistical Mechanics

Background:

Bacteria like Escherichia coli and Pseudomonas putida display different movement patterns in porous media versus free space.
Understanding active particle dynamics in complex environments is crucial for various scientific fields.

Purpose of the Study:

To propose an efficient strategy for active particle navigation in disordered environments.
To investigate how local geometry influences particle dynamics and accelerates movement.

Main Methods:

Simulating active particle behavior in porous media with varying densities.
Analyzing the effect of reorientation rates on particle dynamics.
Observing the diffusion coefficient's dependence on tumbling rate.

Main Results:

A strategy of suppressing reorientation in dilute regions and intensifying it in dense regions was proposed.
Local geometry was shown to dictate optimal paths, accelerating dynamics by up to two orders of magnitude.
Nonmonotonic behavior of the diffusion coefficient and a localization transition were observed.

Conclusions:

The proposed strategy significantly enhances active particle dynamics in disordered environments.
Particle localization can be controlled by adjusting obstacle density or reorientation rate.
This work provides insights into efficient active matter navigation in complex media.