1887

Abstract

SUMMARY: The surface properties of nine and four strains from the oral cavity were examined and compared with a large group of oral streptococci. Zeta potential and contact angle measurements were employed to determine physico-chemical cell surface properties. In addition, elemental surface concentration ratios were obtained via X-ray photoelectron spectroscopy, and surface structures were examined with transmission electron microscopy. The and strains were found to have higher isoelectric points, higher hydrophobicities and higher N/C surface concentration ratios than some other oral streptococci. The combined data suggest that both species possess large amounts of surface protein. All the strains displayed abundant surface fibrils in negative staining, but the strains were devoid of surface appendages indicating that surface protein is present in different forms in the two species. The surfaces of and type strains differed significantly from the other strains examined.

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1992-12-01
2021-05-19
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