Nutrient exposure of chemotactic organisms in small-scale turbulent flows

Munoz-Garcia, Javier, Neufeld, Zoltan and Torney, Colin (2010) Nutrient exposure of chemotactic organisms in small-scale turbulent flows. New Journal of Physics, 12 October: 1-14. doi:10.1088/1367-2630/12/10/103043

Author Munoz-Garcia, Javier
Neufeld, Zoltan
Torney, Colin
Title Nutrient exposure of chemotactic organisms in small-scale turbulent flows
Journal name New Journal of Physics   Check publisher's open access policy
ISSN 1367-2630
Publication date 2010-10
Sub-type Article (original research)
DOI 10.1088/1367-2630/12/10/103043
Open Access Status DOI
Volume 12
Issue October
Start page 1
End page 14
Total pages 14
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Language eng
Abstract Micro-organisms living in a turbulent fluid environment often use directed motility to locate regions of higher than average nutrient concentrations. Here, we consider a simple continuum model for the distribution of such chemotactic particles when the particles and the chemoattractant are both advected by a turbulent flow. The influence of chemotactic sensitivity on the spatial distribution of the particles is characterized for different types of advected chemical fields. Using an effective diffusion approximation, we obtain an analytical expression for the nutrient exposure resulting from the chemotactic activity of the particles, generalizing previous results obtained for the case of phototaxis in flows. We show that the biological advantage of chemotaxis in such systems is determined by the spatial variability of the averaged chemoattractant field and the effective diffusivity of the turbulent flow.
Keyword Velocity-field
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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Created: Tue, 31 Jan 2012, 10:31:41 EST by Kay Mackie on behalf of School of Mathematics & Physics