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CONVERSION OF GLUCOSE-C¹⁴ TO PROPIONATE BY THE RUMEN MICROBIOTA¹

^a Department of Biochemistry and Dairy, Michigan State University, East Lansing, Michigan

ABSTRACT

BALDWIN, R. L. (Michigan State University, East Lansing), W. A. WOOD, AND R. S. EMERY. Conversion of glucose-C¹⁴ to propionate by the rumen microbiota. J. Bacteriol 85:1346–1349. 1963.—Rumen microbiota enriched on three different diets calculated to present different levels of available carbohydrate were incubated with glucose-1-C¹⁴, glucose-2-C¹⁴, and glucose-6-C¹⁴ to determine the contribution of the randomizing (succinate) and nonrandomizing (acrylate) routes to propionate. The propionate was labeled as though 70 to 100% was formed via the randomizing route and 0 to 30% via the nonrandomizing route. The contribution of the acrylate pathway increased with higher carbohydrate availability of the diet. These results are discussed with respect to earlier data using lactate-2-C¹⁴ and lactate-3-C¹⁴, and a unifying concept for both sets of data is presented.

² Predoctoral Fellow of The National Science Foundation. Present address: Department of Animal Husbandry, University of California, Davis.

¹ Contribution no. 3019 of the Michigan Agricultural Experiment Station. A summary of this work was presented at The 8th International Congress of Microbiology, Montreal, Canada, 20–24 August 1962.