Effect of oxygen fluctuations on recombinant Escherichia coli fermentation

✍ Scribed by Pradyumna K. Namdev; Nancy Irwin; B. G. Thompson; Murray R. Gray

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 496 KB
• Volume: 41
• Category: Article
• ISSN: 0006-3592
• DOI: 10.1002/bit.260410610

✦ Synopsis

fscherichia coli DH5cu, carrying the pUC19 plasmid for the lacZ fragment of P-galactosidase and ampicillin resistance, was grown in a batch fermentor under conditions of fluctuating oxygen supply. A Monte Carlo method was used to control the onloff supply of air to simulate circulation of cells in a large fermentor. Rapid changes in oxygen supply reduced the rates of oxygen uptake and carbon dioxide release and prolonged the active second growth phase in batch culture, compared to growth with continuous aeration. Amplification of the plasmid was observed during the stationary phase when air was supplied continuously, but not during the Monte Carlo experiments.