open access

https://hdl.handle.net/2115/28017

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

英語

Amoeboid movement

2007-06

Springer Berlin / Heidelberg

Journal of Mathematical Biology

54(6)

745-760

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.

学術雑誌論文

Accepted Manuscript

The original publication is available at www.springerlink.com

0303-6812

1432-1416