Dispersion relation in oscillatory reaction-diffusion systems with self-consistent flow in true slime mold |
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Authors: | H Yamada T Nakagaki R E Baker P K Maini |
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Institution: | (1) Harukidai 5-1-2, Togo Aichi, 470-0161, Japan;(2) Creative Research Initiative “SOUSEI”, Hokkaido University, Sapporo 001-0821, Japan;(3) Centre for Mathematical Biology, Mathematical Institute, 24-29 St. Giles’, Oxford, OX1 3LB, UK |
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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. |
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Keywords: | Dispersion relation Reaction-diffusion-advection equation Physarum Phase equation Amoeboid movement |
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