We describe the comparative ultrastructures of bile-sensitive species which were isolated from oral cavities and ferment xylose and arabinose. Reference strains ATCC 33574(T = type strain), ATCC 33690and ATCC 33691, and NP333and WPH61 and sp. strains ES42 and ES57 all had an extra surface layer (S-layer) outside the outer membrane. No S-layer was detected in ATCC 33573and ATCC 27518, , or sp. strains ES2759 and ES2834. The deoxyribonucleic acid guanine-plus-cytosine contents and both the malate dehydrogenase and glutamate dehydrogenase mobilities of the strains with an S-layer were identical. We suggest that the oral pentose-fermenting isolates with an S-layer may belong to the same species.


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