Changes in metabolism of the rumen bacteriumStreptococcus bovisH13/1 resulting from alteration in dilution rate and glucose supply per unit time

Abstract

S. bovis H13/1 was grown in a glucose-limited chemostat. A concomitant increase in dilution rate and glucose supply/unit time caused an increase in lactate production/mol of glucose fermented, and a linear increase in growth yield over the dilution rate range 0.052-0.141/h. When the dilution rate was increased with no change in glucose supply/unit time, there was a reduction in lactate production and an increase in that of acetate and ethanol coinciding with a non-linear increase in growth yield. .**GRAPHIC**. = 38.6 and a maintenance coefficient, ms = 0.290 mmol/l glucose per g cells per h were calculated. An interaction between the formate and CO2 pools was suggested.