Nonlinear Chemical Dynamics: The Peroxidase-Oxidase Reaction
The peroxidase-oxidase (or PO) reaction is an enzyme-catalyzed chemical reaction that has been extensively studied in horseradish plants. The overall reaction can be modeled by a set of four first-order ODEs developed by Lars Olsen , which represent the reactants, products, and intermediates of the reaction. What makes this reaction so special is its nonlinear nature; with the right parameters, oscillatory behavior, period doubling, and chaos can be observed.
The equations in this Demonstration were taken directly from  and are as follows:
Here to represent rate constants of the intermediate reactions; , , , and represent , , , and , respectively, with their differentials representing their intermediates.
The suggested settings are , , , , , , , , , , , , .