high-cell density cultures
oxidative and respiro-fermentative metabolism
Biochemistry and Biotechnology
Wiley InterScience Backfile Collection 1832-2000
Process Engineering, Biotechnology, Nutrition Technology
A strain of the fission yeast Schizosaccharomyces pombe was aerobically grown in a cell-recycle fermentor under various operating conditions, i.e., different bleeding rates and various separate feed rates of glucose and basal medium. Carbon and energy balances were analyzed during steady-state culture regimes, allowing growth yields and maintenance coefficients to be determined under glucose-limited and glucose-excess environments. Special attention was given to the metabolic shift from purely oxidative to respirofermentative glucose catabolism resulting from a change in the growth-limiting factor. No maintenance requirements for the carbon source and for energy were observed during glucose-limited culture regimes and oxidative catabolism. Under glucose excess and respirofermentative metabolism, the mG coefficient was shown to be growth-linked, whereas the enhancement of the apparent me coefficient observed for increased residual glucose concentrations could be assigned to a decline in the ATP yield. © 1993 John Wiley & Sons, Inc.
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