The Mathematical Institute, University of Oxford, Eprints Archive

Dispersion relation in oscillatory reaction-diffusion systems with self-consistent flow in true slime mold

Yamada, H. and Nakagaki, T. and Baker, Ruth E. and Maini, P. K. (2007) Dispersion relation in oscillatory reaction-diffusion systems with self-consistent flow in true slime mold. Journal of Mathematical Biology, 54 (6). pp. 745-760.

[img]
Preview
PDF
300Kb

Abstract

In the large amoeboid organism Physarum, biochemical oscillators are spatially distributed throughout the organism and their collective motion exhibits phase waves, which carry physiological signals. The basic nature of this wave behaviour is not well-understood because, to date, an important effect has been neglected, namely, the shuttle streaming of protoplasm which accompanies the biochemical rhythms. Here we study the effects of self-consistent flow on the wave behaviour of oscillatory reaction-diffusion models proposed for the Physarum plasmodium, by means of numerical simulation for the dispersion relation and weakly nonlinear analysis for derivation of the phase equation. We conclude that the flow term is able to increase the speed of phase waves (similar to elongation of wave length). We compare the theoretical consequences with real waves observed in the organism and also point out the physiological roles of these effects on control mechanisms of intracellular communication.

Item Type:Article
Additional Information:n/a
Uncontrolled Keywords:Dispersion relation - Reaction-diffusion-advection equation - Physarum - Phase equation - Amoeboid movement
Subjects:A - C > Biology and other natural sciences
Research Groups:Centre for Mathematical Biology
ID Code:615
Deposited By:Philip Maini
Deposited On:04 Jun 2007
Last Modified:20 Jul 2009 14:22

Repository Staff Only: item control page