Critical size and curvature of wave formation in an excitable chemical medium.
Critical size and curvature of wave formation in an excitable chemical medium.
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可激发化学介质中波形成的临界尺寸和曲率。
DOI：
10.1073/pnas.86.18.6831
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发表时间：
1989
影响因子：
11.1
通讯作者：
B. Hess
中科院分区：
文献类型：
--
作者：
P. Foerster;S. Müller;B. Hess
通过实验分析了Belousov-Zhabotinskii反应的可激发溶液中波向外传播的临界半径约为20μm，在理论预测的范围内。因此，波的引发以全有或全无的方式取决于临界半径。对于具有高正曲率波前曲率的波，建立了曲率与其法向速度之间的线性关系，允许计算自催化物质的扩散系数为1.9 x 10(-5) cm(2)/s，这与之前针对负弯曲波前获得的结果非常吻合。正如理论预测的那样，对波速分散性的分析得出了小起始周期内波速的减小。
The critical radius for the outward propagation of waves in an excitable solution of the Belousov-Zhabotinskii reaction was experimentally analyzed and found to be approximately 20 mum, being in a range predicted by theory. Thus, the wave initiation depends on the critical radius in an all-or-none fashion. For waves having high positive curvature of wave fronts, a linear relationship between the curvature and their normal velocity was established, allowing computation of a diffusion coefficient of 1.9 x 10(-5) cm(2)/s for the autocatalytic species, which agrees well with results previously obtained for negatively curved wave fronts. The analysis of the dispersion of wave velocity yielded the decrease of wave velocity for small initiation periods as predicted theoretically.