Concept

Fermentation

Publications associées (109)

Calorimetry of dual limitations in yeast cultures

Chemostat cultures of an aerobic fermenting yeast (Saccharomyces cerevisiae) and an aerobic respiring yeast (Kluyveromyces fragilis) were grown under dual C + N limitation in an isothermal reaction calorimeter. The dual limitations resulted in uncoupled ox ...

1995

Acetate production from lactate and glucose fermentation by Gluconobacter oxydans

Urs von Stockar

The prodn. of acetate from the fermn. of lactate by Gluconobacter oxydans was studied. Batch expts. showed that glucose was the preferred substrate compared to lactate. A fed-batch culture was fed with a mixt. of glucose and lactate followed by periodic ad ...

1994

Glycerol production by yeast fermentation of whey permeate

Urs von Stockar, Ian William Marison

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 ...

1994

Calorimetry and energetic efficiencies in aerobic and anaerobic microbial growth

Urs von Stockar, Ian William Marison

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. ...

1993

Calorimetry of technical microbial reactions

Urs von Stockar, Ian William Marison

Heat generation is a very conspicuous phenomenon in large scale bioreactors and could in principle quite easily be measured by the temp. increase of the cooling water. Taking yeast cultures growing on a mixed oxido-reductive metab. for various reasons as a ...

1993

The role of the limited respiratory capacity in the Saccharomyces cerevisiae whi2 mutation

Urs von Stockar

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 ...

1992

Calorimetric control of fed-batch fermentations

Urs von Stockar, Ian William Marison

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 ...

1990

Extractive fermentation of ethanol using membrane distillation

Urs von Stockar, Ian William Marison

During the anaerobic batch cultivation of Kluyveromyces fragilis on a complex medium contg. glucose (100 g/L), EtOH was produced at levels resulting in the inhibition of growth and EtOH formation. Continuous extn. of the EtOH using transmembrane distn. res ...

1989

The production of lactic acid from whey permeate by Lactobacillus helveticus

Urs von Stockar

The effect of pH on growth and lactic acid prodn. of L. helveticus was investigated in a continuous culture using supplemented whey ultrafiltrate. Max. lactate productivity of 5 g/L/h occurred at pH 5.5. Whey permeates concd. up to 4 times were fermented u ...

1989

The heat generated by yeast cultures with a mixed metabolism in the transition between respiration and fermentation

Urs von Stockar

The heat generated by both batch and continuous cultures of the yeast Kluyveromycs fragilis was studied using a modified bench scale calorimeter. Batch cultures were used to measure the heat dissipation rates and the heat yields during fully aerobic and co ...

1989

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