%0 Journal Article %A Patrick, Sheila %A Reid, J. H. %T Separation of capsulate and non-capsulate Bacteroides fragilis on a discontinuous density gradient %D 1983 %J Journal of Medical Microbiology, %V 16 %N 2 %P 239-241 %@ 1473-5644 %R https://doi.org/10.1099/00222615-16-2-239 %I Microbiology Society, %X SUMMARY A discontinuous density gradient procedure was used successfully to separate capsulate and non-capsulate cells of strains of Bacteroides fragilis. Bacteria from the capsulate fraction retained their capsules on subculture, but non-capsulate cells reverted to the mixed phenotype. %U https://www.microbiologyresearch.org/content/journal/jmm/10.1099/00222615-16-2-239