%0 Journal Article %A Graham, Ann F. %A Lund, Barbara M. %T The Effect of Alkaline pH on Growth and Metabolic Products of a Motile, Yellow-pigmented Streptococcus sp %D 1983 %J Microbiology, %V 129 %N 8 %P 2429-2435 %@ 1465-2080 %R https://doi.org/10.1099/00221287-129-8-2429 %I Microbiology Society, %X Streptococcus BL 78/7 was isolated from alkaline potato-processing effluent, and resembled S. casseliflavus in morphology, motility and pigment. In aerobic conditions, at controlled pH, growth occurred between pH 5 and 11 with a maximum growth rate between pH 8 and 9 and a maximum yield at pH 8. The major metabolic products formed from glucose were lactate and acetate. The molar proportion of lactate to acetate decreased with increasing pH, from 4:1 at pH 5 to approximately 1:1 above pH 9. Growth occurred under nitrogen over the pH range from below 6 to 11, with a maximum growth rate and yield at pH 7 to 8. Lactate was the major metabolic product, with formate, acetate and ethanol also present in the molar ratio of 2:1:1. The molar proportion of lactate to formate decreased from 5:1 at pH 6 to 1ยท3:1 at pH 11. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-129-8-2429