Complex reactions physiological processes

Berthelot has published a paper1 on the apparatus employed in his experiments, the methods of the quantitative determinations, the influence of the conditions on the reaction velocity, and the dependence of the results upon the duration of the experiment. The latter is particularly important for the theoretical interpretation of the results. Simple, binary compounds are primarily formed which are secondarily polymerized to complex compounds—similarly as in physiological processes, in which the assimilated substances, after being split up into simpler substances for the purpose of nutrition, are again united to complicated compounds.2... 

One of the most important uses for metal complexes is in the homogeneous catalysis of reactions. Studies of metal enzymes (physiological catalysts) show that the site of reaction in the biological system is frequently a complexed metal ion. Many industrial processes depend directly on catalysis hy metal complexes. The reaction of an alkene with carbon monoxide and hydrogen takes place in the presence of a cobalt complex, reaction (1). 

Neurotransmitters, such as dopamine (DA) and epinephrine (EP), are catecholamines that undergo complex multistep oxidation processes in aqueous solution via coupled ET, proton transfer (2e , 2H at physiological pH), but with the complication of side reactions to form melanin-like compounds that can block electrode surfaces [193]. Such processes are expected to follow a classical scheme of squares [194], and are of considerable interest for the practical detection of neurotransmitters, as carbon electrodes have become the electroanalytical platform of choice [5, 60, 195]. This is due to a desirable range of properties including biocompatibihty, chemical inertness, and low background current that are responsible for lower detection hmits, wide potential windows, and low... 

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