Substrate concentrations normal physiological values

The identification of phenomena that explain the behavior of a studied system depends on the analysis of their kinetic data. Normally, this kinetic analysis is performed using characteristic variables calculated from the experimental data. The specific rates and the yield coefficients are the common values used in this task. When cell concentration data are available, cell growth and death rates, as well as cell viability, are the best kinetic variables to characterize the population physiological state. In the absence of this information - as can occur, for example, with immobilized cells - the treatment must be based on substrate consumption or on metabolites production (Miller and Reddy, 1998). 

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