Determination of effective transport coefficients for bacterial migration in sand columns.

Applied and Environmental Microbiology
J W Barton, R M Ford

Abstract

A well-characterized experimental system was designed to evaluate the effect of porous media on macroscopic transport coefficients which are used to characterize the migration of bacterial populations. Bacterial density profiles of Pseudomonas putida PRS2000 were determined in the presence and absence of a chemical attractant (3-chlorobenzoate) gradient within sand columns having a narrow distribution of particle diameters. These experimental profiles were compared with theoretical predictions to evaluate the macroscopic transport coefficients. The effective random motility coefficient, used to quantify migration due to a random process in a porous medium, decreased nearly 20-fold as grain size in the columns decreased from 800 to 80 (mu)m. The effective random motility coefficient (mu)(infeff) was related to the random motility coefficient (mu), measured in a bulk aqueous system, according to (mu)(infeff) = ((epsilon)/(tau))(mu) with porosity (epsilon) and tortuosity (tau). Over the times and distances examined in these experiments, bacterial density profiles were unaffected by the presence of an attractant gradient. Theoretical profiles with the aqueous phase value of the chemotactic sensitivity coefficient (used to quantify ...Continue Reading

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Citations

Sep 8, 2010·Environmental Toxicology and Chemistry·Rajveer Singh, Mira Stone Olson
Mar 13, 2015·FEMS Microbiology Ecology·Liyan PingEldon Emberly
May 7, 2002·Biotechnology and Bioengineering·Joseph A PeditMichael D Aitken
Jan 20, 2006·FEMS Microbiology Ecology·James G Mitchell, Kazuhiro Kogure
Apr 19, 2011·Applied and Environmental Microbiology·Victoria B TranClayton J Radke
May 21, 2003·Environmental Technology·I S Ahn, C H Lee
Nov 5, 2008·Annals of Biomedical Engineering·Alka A PotdarPeter T Cummings
Mar 5, 1997·Biotechnology and Bioengineering·J W Barton, R M Ford
Jul 2, 1999·Applied and Environmental Microbiology·R B Marx, M D Aitken
Apr 19, 2017·Physical Review. E·Juan Eduardo Sosa-HernándezJesús Santana-Solano
Jul 28, 2020·The Journal of Chemical Physics·A Arango-Restrepo, J M Rubi
Apr 9, 2009·Environmental Science & Technology·Tao Long, Roseanne M Ford
Jan 30, 1999·Applied and Environmental Microbiology·M F DeFlaunM Fletcher
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Jan 26, 2005·Environmental Science & Technology·Mira Stone OlsonErik J Fernandez
Mar 15, 2003·Environmental Science & Technology·Juli L SherwoodJames A Smith
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