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Simple generic model for dynamic experiments with Saccharomyces cerevisiae in continuous culture: Decoupling between anabolism and catabolism
Author(s) -
Duboc Philippe,
von Stockar Urs,
Villadsen John
Publication year - 1998
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/(sici)1097-0290(19981020)60:2<180::aid-bit5>3.0.co;2-j
Subject(s) - catabolism , anabolism , chemistry , biochemistry , biosynthesis , decoupling (probability) , metabolism , saccharomyces cerevisiae , anaerobic exercise , yeast , dilution , biology , biophysics , enzyme , thermodynamics , physics , physiology , control engineering , engineering
The dynamic behavior of a continuous culture of Saccharomyces cerevisiae subjected to a sudden increase in the dilution rate has been successfully modelled for anaerobic growth on glucose, and for aerobic growth on acetate, on ethanol, and on glucose. The catabolism responded by an immediate jump whereas biosynthesis did not. Thus catabolism was in excess to anabolism. The model considers the decoupling between biosynthesis and catabolism, both types of reactions being modelled by first‐order kinetic expressions evolving towards maximal values. Yield parameters and maximal reaction rates were identified in steady state continuous cultures or during batch experiments. Only the time constant of biosynthesis regeneration, τ X , and the time constant of catabolic capacity regeneration, τ cat , had to be identified during transient experiments. In most experiments τ X was around 3 h, and τ cat varied between 2 and 2.5 h for the different metabolisms investigated. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 60: 180–189, 1998.