Temperature Compensation in the Oscillatory Bray Reaction

Abstract

The influence of temperature on the oscillatory frequency of the hydrogen peroxide-iodate ion reaction is found to be two-sided: (i) the period length decreases with increasing temperature in most of the instances studied, (ii) or in some cases an opposite change is observed. A temperature-independent period length (temperature compensation) is also discovered experimentally in a rather wide temperature interval at a narrow concentration range of reactants both in a batch configuration and under flow conditions. A simple model was considered to simulate this behavior. Opposing effects of the composite reactions of the model on the calculated period length with changing temperature are shown to be responsible for temperature compensation or overcompensation.

Temperature (Over)Compensation in an Oscillatory Surface Reaction

“…Temperature compensation of the oscillation period, or the near-independence of the oscillation period on temperature, is observed at high currents and at lower temperatures. For comparison, the temperature coefficient of 7 Temperature coefficients between 0.67 and 1.80 were obtained by Rábai and co-workers 34 for the classic Bray reaction. Those experiments were carried out in batch, within a temperature interval of 10°C, and the q 10 values were found to be strongly dependent on the concentration of some reactants.…”

“…3 From the purely chemical side, the increase of oscillation amplitude with temperature, as suggested by Lakin-Thomas et al, 44 has been observed in the temperature-compensated hydrogen peroxideiodate ion chemical system (the Bray reaction) in batch. 34 Pittendrigh et al 46 studied different aspects of the amplitude of Drosophila circadian pacemaker and observed that, unlike its period, the amplitude of the pacemaker is strongly temperature dependent. The results reported for Drosophila 46 differ from those reported for Neurospora 44 in terms of the temperature dependence of the oscillation amplitude: a temperature rise results in an amplitude decrease in the former case and in an amplitude increase in the latter.…”

“…33 Numerical simulations show a decrease in the oscillation amplitude when the temperature is increased. Studying the effect of temperature on the oscillatory decomposition of hydrogen peroxide in an acidic aqueous solution in the presence of potassium iodate (Bray reaction), Kovács et al 34 observed in CSTR experiments that, for a certain flow rate, the oscillation amplitude increases for increasing temperature when temperature compensation is achieved.…”

Temperature compensation through systems biology

“…In 1957, Hastings and Sweeney suggested that in biological clocks such temperature compensation may occur as the result of opposing reactions within the metabolic network [11]. Later kinetic analysis of the problem [12] reached essentially the same conclusion, and predictions of the theory have been tested by experiments using Neurospora 's circadian clock [13] and chemical oscillators [14,15].…”

Dynamic transitions in the Bray–Liebhafsky oscillating reaction. Effect of hydrogen peroxide and temperature on bifurcation

“…This apparently simple chemical reaction is a good example of a nonlinear dynamical system in which various non-equilibrium phenomena have been observed experimentally and by theoretical analysis of model mechanisms. However, most often, these studies have focused on the examination of BL properties in a batch reactor 1 [4][5][6][7][8][9][10][11][12][13][14][15][16][17], whereas there is still a relatively small number of investigations that examine BL dynamical properties and underlying molecular mechanisms in an open reactor, i.e. a continuous stirred tank reactor (CSTR) [12,[18][19][20][21][22][23][24].…”