The heat generated by yeast cultures with a mixed metabolism in the transition between respiration and fermentation
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A simple definition of the energetic growth efficiency both in terms of enthalpy and free energy is given and discussed. In cultures growing by respiratory catabolism, these efficiencies may conveniently be obsd. online by isothermal reaction calorimetry. ...
The growth physiol. of S. cerevisiae strains H1022 and Whi2+ was studied in aerobic batch and continuous (chemostat) cultures. Results from the measurement of biomass and medium components (off-line) together with O2, CO2, and heat measurements (online) we ...
Fundamental aspects of chemostat cultures are reviewed. Using yeast cultures as examples, it is shown that steady states in chemostats may be predicted quant. by combining the correct no. of unstructured kinetic models with expressions for existing stoichi ...
Yeast strains were examd. for their ability to produce glycerol, and Kluyveromyces marxianus NRRLY-665 was chosen for further optimization due to its comparatively high growth rate (0.15/h) and glycerol yield (9.5% by wt. on lactose) at 37 Deg and pH 7. Op ...
Synchronized oscillating cultures of Saccharomyces cerevisiae CBS 426 exhibit periodic oxidoreductive metab. The changing metab. is detectable by in situ heat-flux calorimetry in the BSC 81, which was operated as a chemostat in these expts. The measured me ...
Heat produced by hybridoma suspension cultures was continuously monitored in a 2-L heat-flux calorimeter. Heat measurements reflected changes in the metabolic state of the culture under different aeration conditions. A highly anaerobic metab. was indicated ...
The use of the heat-flux calorimeter BSC-81 as a chemostat is described. The technique was applied to study the heat generation rate by continuous cultures of the yeast Kluyveromyces fragilis NRRL 1109 as a function of specific growth rate. The maintenance ...
Measurements of the heat produced by Saccharomyces cerevisiae CBS 426 were used in conjunction with elemental and enthalpic balances to control fed-batch fermns. A proportional control using the ratio of carbon dioxide evolution rate to heat prodn. resulte ...
The whi2 mutation in S. cerevisiae allows mutant cells to grow with a higher specific rate and at smaller cell sizes at the onset of EtOH metab. in diauxic growth. S. cerevisiae Whi2+ and whi2 were cultivated in aerobic and anaerobic batch cultures in the ...
Yeasts degrade glucose through different metabolic pathways, where the choice of the pathway is dependent on the nature of the limitation in the various substrates. When oxygen is limiting in addn. to glucose, yeasts often grow according to a mixt. of oxid ...