%0 Journal Article %A Van Gylswyk, N. O. %A Labuschagne, J. P. L. %T Relative Efficiency of Pure Cultures of Different Species of Cellulolytic Rumen Bacteria in Solubilizing Cellulose in vitro %D 1971 %J Microbiology, %V 66 %N 1 %P 109-113 %@ 1465-2080 %R https://doi.org/10.1099/00221287-66-1-109 %I Microbiology Society, %X 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 in vitro. Strains of Ruminococcus albus solubilized it most rapidly, followed by R. flavefaciens. Butyrivibrio fibrisolvens showed consistently low rates of solubilization while strains of Cillobacterium cellulosolvens 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 R. albus and R. flavefaciens grew almost as rapidly in cellulose- as in cellobiose-containing media, while B. fibrisolvens strains grew better in medium with cellobiose. On this basis the ruminococci were termed true cellulolytic bacteria. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-66-1-109