Multiple phase variation in haemolytic, adhesive and antigenic properties of Streptococcus gordonii
Article Abstract:
The parent strain of Streptococcus gordonii strain Challis and sucrose- promoted phenotype (SPP) + and SPP-phase variant strains are examined for changes in other phenotypes under certain conditions. The adhesion of the strains to salivary pellicles and interbacterial coaggregation actions is examined. The newly described beta-haemolysin is also studied for its virulence. Results indicate that significant changes in the phenotypes may occur concurrently with Spp phase variation, although the phenotypic change may not correlate with either Spp phase variant.
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1996
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In vitro phagocytosis and survival of Streptococcus suis capsular type 2 inside murine macrophages
Article Abstract:
Mouse peritoneal macrophages phagocytose non-virulent non-capsulated forms of Streptococcus suis capsular type 2 more than the virulent and non-virulent capsulated forms. This indicates that the bacterial capsule prevents phagocytosis. The capsulated cells show greater survival inside the macrophages than the non-capsulated forms. Cells that have been opsonized by rabbit serum are phagocytosed more than the non-opsonized cells. Thus, the phagocytosis and survival of the bacterial cells in the macrophages is affected by serum factors other than complement.
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1996
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A 16 kDa protein family overexpressed by Streptococcus thermophilus PB18 in acid environments
Article Abstract:
One-dimensional sodium dodecyl sulfate-polyacrilamide gel electrophoresis (SDS-PAGE) was utilized to characterize the biochemical properties of the Streptococcus thermophilus 16 kilodalton (kDa) protein. SDS-PAGE analysis of the kinetics of the Streptococcus thermophilus 16 kDa protein indicated overexpression of the protein during the stationary phase after the microbe had acidified its culture medium. Furthermore, the expression of the protein was not affected by the composition of the culture media.
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1997
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