SUMMARY: The rates at which two strains each of four species of cellulolytic rumen bacteria could grow on and solubilize ball-milled filter paper were compared Strains of solubilized it most rapidly, followed by showed consistently low rates of solubilization while strains of maintained on cellobiose-containing medium gradually lost their ability to solubilize cellulose. Cellulolysis could not be restored by successive transfers to media each containing one of different cellulose oligosaccharides. Strains of and grew almost as rapidly in cellulose- as in cellobiose-containing media, while strains grew better in medium with cellobiose. On this basis the ruminococci were termed true cellulolytic bacteria.


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