1.
Biotechnol Bioeng
; 19(9): 1363-74, 1977 Sep.
Article
in English
| MEDLINE
| ID: mdl-329912
ABSTRACT
Oscillatory changes in the growth rate were observed in undisturbed continuous culture of Saccharomyces cerevisiae on sugar-cane molasses media when nitrogen sources (2.56 to 6.17 g/liter of ammonium sulfate or 1.22 g/liter of urea) were added to the feeding mash and when the air rate was 1.3 to 1.6 v/v/m. The oscillations were not affected by the addition of yeast extract. The suppression of the nitrogen source during the continous test leads to a nonoscillatory transient state. No oscillations occured at all when no nitrogen source was added to the medium and/or the air rate was equal to zero or equal to about 3.3 v/v/m. The oscillatory responses of the system were affected by a previous anaerobic continuous cultivation of the yeast.
Subject(s)
Saccharomyces cerevisiae/physiology , Aerobiosis , Cell Division , Culture Media , DNA/metabolism , Industry , Mathematics , Methods
2.
Biotechnol Bioeng
; 18(6): 885-7, 1976 Jun.
Article
in English
| MEDLINE
| ID: mdl-773454