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Appl Environ Microbiol. 1979 Mar;37(3):544-9. doi: 10.1128/aem.37.3.544-549.1979.

Effects of combinations of substrates on maximum growth rates of several rumen bacteria.

Applied and environmental microbiology

J B Russell, F J Delfino, R L Baldwin

Affiliations

  1. Department of Animal Science, University of California, Davis, California 95616.

PMID: 16345360 PMCID: PMC243252 DOI: 10.1128/aem.37.3.544-549.1979

Abstract

Five rumen bacteria, Selenomonas ruminantium, Bacteroides ruminicola, Megasphaera elsdenii, Butyrivibrio fibrisolvens, and Streptococcus bovis were grown in media containing nonlimiting concentrations of glucose, sucrose, maltose, cellobiose, xylose and/or lactate. Each bacterium was grown with every substrate that it could ferment in every possible two-way combination. Only once did a combination of substrates result in a higher maximum growth rate than that observed with either substrate alone. Such stimulations of growth rate would be expected if specific factors unique to individual substrates (transport proteins and/or enzymes) were limiting. Since such synergisms were rare, it was concluded that more general factors limit maximum growth rates in these five bacteria.

References

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