Perturbations of simple oscillations and complex dynamics in the peroxidase-oxidase reaction using magnetic fields

The effect of de magnetic fields of the order of 0-4000 G on the oscillatin g peroxidase-oxidase (PO) reaction was studied. Specifically the effects of magnetic fields on the amplitude of simple periodic oscillations and on co mplex dynamic states were investigated. Magnetic fields induce a biphasic c hange in oscillation amplitude. At field strengths up to 1500 G, the amplit ude decreases gradually by 11%. At higher field strengths the decrease in a mplitude is less, and it vanishes at field strengths of 4000 G and higher. The effect of magnetic fields on complex dynamics is generally to shift the dynamics from one state to a neighboring state. Numerical simulations of a detailed model of the PO reaction support the hypothesis that the magnetos ensitive step is the reduction of compound II to ferric peroxidase or the r eduction of compound I to compound II or both.