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Oscillatory cluster patterns in a homogeneous chemical system with global feedback

Oscillatory clusters are sets of domains in which nearly all elements in a given domain oscillate with the same amplitude and phase. They play an important role in understanding coupled neuron systems. In the simplest case, a system consists of two clusters that oscillate in antiphase and can each o...

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Published in:Nature (London) 2000-07, Vol.406 (6794), p.389-391
Main Authors: Zhabotinsky, Anatol M, Vanag, Vladimir K, Yang, Lingfa, Dolnik, Milos, Epstein, Irving R
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description Oscillatory clusters are sets of domains in which nearly all elements in a given domain oscillate with the same amplitude and phase. They play an important role in understanding coupled neuron systems. In the simplest case, a system consists of two clusters that oscillate in antiphase and can each occupy multiple fixed spatial domains. Examples of cluster behaviour in extended chemical systems are rare, but have been shown to resemble standing waves, except that they lack a characteristic wavelength. Here we report the observation of so-called 'localized clusters'-periodic antiphase oscillations in one part of the medium, while the remainder appears uniform-in the Belousov-Zhabotinsky reaction-diffusion system with photochemical global feedback. We also observe standing clusters with fixed spatial domains that oscillate periodically in time and occupy the entire medium, and irregular clusters with no periodicity in either space or time, with standing clusters transforming into irregular clusters and then into localized clusters as the strength of the global negative feedback is gradually increased. By incorporating the effects of global feedback into a model of the reaction, we are able to simulate successfully the experimental data.
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subjects Catalysis
Catalytic reactions
Chemistry
Exact sciences and technology
General and physical chemistry
Humanities and Social Sciences
letter
multidisciplinary
Oxidation
Photochemicals
Reagents
Science
Science (multidisciplinary)
Standing waves
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
title Oscillatory cluster patterns in a homogeneous chemical system with global feedback
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