title: Effect of temperature and pH onCandida blankii in chemostat culture.
abstract: The growth characteristics ofCandida blankii as a function of temperature and pH in a simulated bagasse hemicellulose hydrolysate were determined in chemostat culture. The highest maximum specific growth rate of 0.44h(-1) was reached at 38°C and at pH 5.5, with a sharp decrease in growth rate on either side of this temperature. Growth occurred at 46°C but not at 48°C. The protein and cell yields varied little below 40°C and the respective values were 0.22 and 0.5 g/g at 38°C. At the lower pH values, a severe linear decrease in cell and protein yields occurred, whereas a small increase in these yields at decreasing pH values was found when acetic acid was omitted from the medium. In the presence of acetic acid, a very sharp decrease in the growth rate at pH values below pH 4.5 was noted, despite the very low residual acetic acid concentrations, of less than 50 mg/l, in the culture.
authors.affiliation: Department of Microbiology and Biochemistry, University of the Orange Free State, P.O. Box 339, 9300, Bloemfontein, South Africa.
authors.forename: P S
authors.initials: PS
authors.lastname: Meyer
authors.forename: J C
authors.initials: JC
authors.lastname: du Preez
authors.forename: S G
authors.initials: SG
authors.lastname: Kilian