Neuraminidase Activity in Mixed Culture Supernatant Fluids of Human Oral Bacteria

Neuraminidase Activity in Mixed Culture Supernatant Fluids of Human Oral Bacteria.

In view of the finding (Thonard and Blustein, J. Dent. Res., in press, 1965) that sialic acid is present in human gingival mucosa, it was decided to investigate the possibility that members of the human oral microflora might elaborate an enzyme able to attack the sialic acid-containing compounds thought to be present in the gingiva. The present report concerns the finding that neuraminidase is ...

Effect of Physical and Chemical Changes on the Antimicrobial Activity of Culture Supernatant Fluid of Lactic Acid Bacteria

ABSTRACT         Background and Objective: Lactic acid bacteria are Gram-positive, catalase-negative, nonsporulating, either rod- or coccus-shaped bacteria that have beneficial effects on their hosts by producing antimicrobial substances such as lactic acid, hydrogen peroxide, bacteriocins and biosurfactants. Bacteriocins are antimicrobial peptides that a...

immunosuppressive activity of leishmania major culture supernatant

balb/c mice are highly susceptible to infection with the protozoan parasite leishmania major. this susceptibility has been attributed in part to the expansion of th2 cells and production of their cytokines, il-4 and il-10 and down-regulation of th1 cytokine, inf-γ. the inability of susceptible hosts to mount the immune response necessary to activate macrophage and destroy the parasites can be d...

Regulation of MMP-9 activity in human tear fluid and corneal epithelial culture supernatant.

PURPOSE To evaluate human corneal epithelial culture supernatant and tear fluid for the presence of activators and inhibitors of matrix metalloproteinase (MMP)-9, MMP-3, and tissue inhibitor of metalloproteinase (TIMP)-1, respectively, and to evaluate the effect of MMP-3 on the activation of MMP-9 in these specimens. METHODS Unstimulated tear fluid was collected from patients with ocular rosa...

Lysis of Staphylococcus aureus by culture supernatant fluids of a species of Aeromonas.