Turing Patterns in the CIMA and CDIMA Reactions Experiments

2 Turing Patterns in the CIMA and CDIMA Reactions Experiments 

The ratio d of the diffusion coefficients of the inhibitor and the activator d = cio / r value very close to one. Typically a value ofd = 1.07 is chosen in simulations, which appears to represent a situation rather unfavorable for the formation of Turing patterns. This view is too simple, however it overlooks the role of starch in the reaction. As discussed in Sect. 1.4.9, the activator 1 reacts with iodine, I2, to form triiodide ion 13 , which gets trapped by the starch molecules embedded in the gel or by iodide-binding sites of the gel. (Polyacrylamide binds polyiodide ions even in the absence of starch as does poly(vinyl alcohol), used as a 

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