Submitted for the MAR13 Meeting of The American Physical Society Morphogenesis in Belousov-Zhabotinsky microdroplets1 NING LI, NATHAN TOMPKINS, CAMILLE GIRABAWE, IRVING EPSTEIN, SETH FRADEN, Brandeis University, BRANDEIS/MRSEC TEAM — We present experimental evidence for the six cases Alan Turing predicted using linear stability analysis in his 1952 paper “The chemical basis of morphogenesis” in...

In a preceding paper [1] it was shown that Br02oscillations can be detected in the Belousov-Zhabotinsky-system by following the absorbanee in the spectral region from 400 to 600 nm. According to the theory given by Field, Koros and Noyes [2] for the BZ-system, Br02 is responsible for the autocatalvsis of the Ce3+/Br03~-reaction. For this reason we have tried to detect Br02 as an intermediate in...

We consider a discrete version of the Brusselator Model of the famous Belousov-Zhabotinsky reaction in chemistry. The original model is a reaction-diffusion equation and its discrete version is a coupled map lattice. We study the dynamics of the local map, which is a smooth map of the plane. We discuss the set of trajectories that escape to infinity as well as analyze the set of bounded traject...

Cluster-cluster transitions in the periodically illuminated photosensitive Belousov-Zhabotinsky (BZ) reaction-diffusion system exhibit the same scenario as in the autonomous BZ system with negative global feedback: two-phase clusters <--> three-phase clusters <--> irregular clusters <--> localized clusters. Transitions induced by changing the dark ( TD) or light ( TL) phases of the periodic ext...

Excitable chemical system can process information coded in excitation pulses. Here we discuss the simplest realization of a chemical signal diode that transmits pulses in one direction only. The construction of such diode just requires a geometrical combination of three areas characterized by different excitability. The proposed construction of chemical signal diode has been tested in numerical...

The evolution of excitation wave fronts in a spatially modulated light-sensitive Belousov-Zhabotinsky system is investigated experimentally and theoretically. The excitation wave propagates in a thin, quasi-two-dimensional reaction layer, which is illuminated through a periodical gray level mask. The light-induced differences in excitability and velocity give rise to a temporal and spatial modu...