Nutrient exposure of chemotactic organisms in small-scale turbulent flows

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Title: Nutrient exposure of chemotactic organisms in small-scale turbulent flows
Authors: Muñoz-García, Javier
Neufeld, Zoltán
Torney, Colin
Permanent link: http://hdl.handle.net/10197/5045
Date: 27-Oct-2010
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.
Type of material: Journal Article
Publisher: IOP Publishing
Copyright (published version): 2010 IOP Publishing
Keywords: chemotactic organisms;continuum model;fluid dynamics;nutrient uptake
DOI: 10.1088/1367-2630/12/10/103043
Language: en
Status of Item: Peer reviewed
Appears in Collections:SBI Research Collection

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