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2009 Volume 2 Issue 1

A feasibility analysis of bacterial chemotaxis under the influence of external noise


Abstract
Bacteria moving in response to chemical attractants are subject to noise from the environment in addition to that within the cells. Environmental noise is observed typically through fluctuations in the concentrations of the chemoattractant. Interactions between two or more sources of noise may upset the chemotactic motility of the cells. This possibility is investigated here for Escherichia coli through a pair of conditions derived earlier. These conditions relate the tumbling time, the sensing time and the adaptation time of the cells. It is observed that chemotaxis is not feasible if the normalized variance of the external noise exceeds a critical value. This critical value does not depend on the expression of CheR, a key protein in the chemosensory system, and it agrees with similar values reported by others for intra-cellular noise. These observations indicate that stochastic resonance may be a prime factor enhancing chemotaxis in the presence of noise. Keywords: Escherichia coli; chemotaxis; external noise; time constants; feasibility; stochastic resonance Received: 18 August 2009 / Received in revised form: 18 August 2009, Accepted: 31 August 2009, Published online: 22 September 2009

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JOURNAL OF BIOCHEMICAL TECHNOLOGY
JOURNAL OF BIOCHEMICAL TECHNOLOGY
Journal of Biochemical Technology is a peer reviewed International Journal published by the Sevas Publishing on behalf of the Biochemical Technology Society, a Registered Charity Organization from India

AREA OF INTEREST
AREA OF INTEREST
Areas of high interest, cover new advances in enzymatic and protein mechanims; applied molecular genetics and biotechnology; genomics and proteomics; metabolic; medical, environmental, food and agro biotechnology.

FOCUS AND SCOPE
FOCUS AND SCOPE
Journal Of Biochemical Technology” Provides A Medium For The Rapid Publication Of Full-Length Articles, Mini-Reviews Of New And Emerging Products And Short Communications On All Aspects Of ...

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This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge. Keywords include, Biochemical Research: Endo/exocytosis, Trafficking, Membrane Biology, Cell Migration, Cell-Matrix Organelle Biogenesis, Cytoskeleton Proteolysis, Cell Death, Cell Cycle, Cancer, Cell Growth/Death, Differentiation, Drug Targets, Gene Therapy, Models of Disease, Proteomics, Stem Cells, Bioenergetics, Mitochondria, Free Radicals, Redox Signaling, Ion Transport/Channels, Oxidative