Excitability in chemical and biochemical pH-autocatalytic systems

Faraday Discussions
J ZagoraIgor Schreiber

Abstract

Using two different kinds of pH systems--the papain catalyzed hydrolysis of N-benzoyl-L-arginine ethyl ester in a membrane reactor and the bromate-sulfite-ferrocyanide (BSF) reaction in the CSTR--we study the relation among excitability, oscillations and bistability, and the ability of the system to respond to external periodic perturbations. Excitable properties of dynamical systems are examined in terms of a threshold set which is used to characterise dynamics in the reactor subject to external periodic stimuli. A precise definition and a method of calculating the threshold set are formulated. Two kinds of excitability distinguished by either direct or indirect initiation of the activatory process are found in both pH systems. Periodic pulsed perturbations of the BSF system display a nontrivial dependence of an excitation number on the forcing period. We examined this system also in oscillatory mode by looking at the phase shifts caused by single-pulse perturbations and constructing the phase transition curves (PTCs).

Citations

Apr 11, 2007·Proceedings of the National Academy of Sciences of the United States of America·David G MíguezIrving R Epstein
May 17, 2014·The Journal of Physical Chemistry. B·Tamás Bánsági, Annette F Taylor
Feb 24, 2016·The Journal of Physical Chemistry. B·Tomáš VeberIgor Schreiber
Aug 11, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Michal Voslar, Igor Schreiber
Mar 5, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Michal Voslar, Igor Schreiber
Jan 17, 2008·The Journal of Physical Chemistry. a·Oldrich PesekIgor Schreiber
Nov 5, 2013·The Journal of Physical Chemistry. a·Tomáš VeberIgor Schreiber
Jul 15, 2006·The Journal of Physical Chemistry. a·Tibor G Szantó, Gyula Rabai

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