Relationship between growth, fermentation, and respiration rates in Saccharomyces cerevisiae: A study based on the analysis of the yield Ypx

To improve productivity in the development of a micro- bial process for the formation of energy metabolism prod- ucts, it is important to establish whether or not the product formation rate depends on other metabolic processes such as the growth rate. Three different situations have been de- scribed with regard to growth rate and product formation rate’: 1) those in which both processes are totally linked, so that the amount of product formed is directly propor- tional to the biomass formed and the specific rate of prod- uct formation,