Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session F20: Active Matter and Liquid Crystals in Biological and Bio-Inspired Systems I
8:00 AM–11:00 AM,
Tuesday, March 15, 2022
Room: McCormick Place W-185BC
Sponsoring
Units:
DSOFT DPOLY GSNP
Chair: Mehdi Molaei, U Chicago
Abstract: F20.00005 : Kinetic theory modeling of bacteria diffusion and chemotaxis
8:48 AM–9:00 AM
Presenter:
Rodrigo B Soto
(Univ de Chile)
Authors:
Rodrigo B Soto
(Univ de Chile)
Andrea Villa
(Univ de Chile)
Here, we build a kinetic model for the chemotactic bacterial motion that includes the fluctuations of the protein concentration. It is found that the run times follow a broad log-normal distribution, which implies that the decay times of the orientation correlation function should also follow this distribution. Using this result, by experimentally following hundreds of bacteria, we were able to fit the model parameters for E. coli.
The kinetic model is then used to quantify the bacterial diffusion in a homogeneous medium and the chemotactic response in presence of imposed external gradients. It is found that for high sensitivities of the tumbling rate to the protein concentration or for long memory times, which are indeed consistent with the experimental values, the times it takes to reach the diffusive regime or the stationary chemotactic current grows enormously. These long-living transient regimes are characterized by a strong deviation from a Gaussian distribution of displacements and by a non-monotonic dependence of the current on the chemoattractant gradient. Implications of the results for macroscopic modeling of bacterial contamination are finally given.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700