Catalytic enzymes temperature adaptation

In the biochemical network, the processing elements do not learn from task examples, but the knowledge is already built in. For example, an enzyme recognizes a specific substrate and applies a specific rate for the catalytic reaction, as a function of the particular conditions, pH, temperature, and so on. Therefore, in such systems, adaptation is implemented by adjusting the catalytic characteristics according to environmental conditions and following laws already built in by evolution. 

Fig. 3. Homologous enzymes adapted to different temperatures show a trade-off between catalytic activity at low temperatures (high for enzymes from psychrophilic organisms, but generally low for enzymes from thermophiles) and thermostability (high for thermophilic enzymes, but low for enzymes from psychrophiles). These natural enzymes lie in the darker shaded area, which is bounded on one side by the minimal stability and activity required for biological function. Enzymes that are both highly thermostable and highly active at low temperature (lighter shaded area) are generally not found in nature.

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