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November  2006, 6(6): 1239-1260. doi: 10.3934/dcdsb.2006.6.1239

Global existence results for complex hyperbolic models of bacterial chemotaxis

Radek Erban 1, and  Hyung Ju Hwang 2,

1. 

University of Oxford, Mathematical Institute, 24-29 St Giles', Oxford, OX1 3LB, United Kingdom
2. 

Trinity College Dublin, School of Mathematics, Dublin 2, Ireland

Received  December 2005 Revised  July 2006 Published  August 2006

Bacteria are able to respond to environmental signals by changing their rules of movement. When we take into account chemical signals in the environment, this behaviour is often called chemotaxis. At the individual-level, chemotaxis consists of several steps. First, the cell detects the extracellular signal using receptors on its membrane. Then, the cell processes the signal information through the intracellular signal transduction network, and finally it responds by altering its motile behaviour accordingly. At the population level, chemotaxis can lead to aggregation of bacteria, travelling waves or pattern formation, and the important task is to explain the population-level behaviour in terms of individual-based models. It has been previously shown that the transport equation framework [12, 13] is suitable for connecting different levels of modelling of bacterial chemotaxis. In this paper, we couple the transport equation for bacteria with the (parabolic/elliptic) equation for the extracellular signals. We prove global existence of solutions for the general hyperbolic chemotaxis models of cells which process the information about the extracellular signal through the intracellular biochemical network and interact by altering the extracellular signal as well. Working in one spatial dimension with multi-dimensional internal dynamics, conditions for global existence in terms of the properties of the signal transduction model are given.
Keywords: velocity-jump process, Chemotaxis, global existence, collective behaviour., bacteria, transport equation, internal dynamics.
Mathematics Subject Classification: 35Q80, 92B05, 92D25, 60J7.
Citation: Radek Erban, Hyung Ju Hwang. Global existence results for complex hyperbolic models of bacterial chemotaxis. Discrete & Continuous Dynamical Systems - B, 2006, 6 (6) : 1239-1260. doi: 10.3934/dcdsb.2006.6.1239
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