summaryGrowth and lactic acid production by L. delbrwckii was studied in a dialysis culture system and the inhibitory effect of lactate confirmed by removing ladste from the culture medium by dialysis. It has been shown that lactate inhibits growth after the log phase and that the maintenance of low lactate concentrations after this point permits higher specific growth rates and higher maximum cell concentrations. Acid production is also significantly higher in a dialysis culture system. Finally, a modification of the Luedeking-Piret model, incorporating the lactate inhibition effect, is proposed.
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