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Reported differences in antibiotic production dynamics resulting from altering the growth-limiting nutrient (growth-dissociated production in carbon-limited culture and apparent growth-associated production in nitrogen-limited culture) are due to the different effects on growth kinetics. The substrate affinity for nitrate is significantly lower than that for glucose, resulting in nitrogen limitation effectively occurring throughout the culture. Glucose limitation occurs later in the culture, coinciding with the induction of antibiotic production. Induction occurs at the start of nitrogen-limited culture so that production appears to be growth-associated. Evidence that this hypothesis is consistent with production kinetics in cyclic fed batch culture was also obtained.

A physiological model for the control of erythromycin production in batch and cyclic fed batch culture