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PubMed1964

PYOCINE-TYPING OF HOSPITAL STRAINS OF PSEUDOMONAS PYOCYANEA.

A method of typing Pseudomonas pyocyanea is described which makes use of the property of bacteriocine production. The method was applied in an epidemiological study of Ps. pyocyanea infection in a general hospital. It was found that the majority of strains believed on epidemiological grounds to be of common origin were allotted to the same pyocine type. In the course of this study, Ps. pyocyanea was isolated from 219 patients; 474 strains from 149 of these were typed. There was evidence of cross-infection among patients in a urogenital surgical ward, but in other parts of the hospital there appeared to be little cross-infection. A number of individual instances of auto-infection, possibly arising from the bowel flora, were seen.

Anti-Bacterial Agents↗
PubMed1975

Antigenic heterogeneity among pyocins of Pseudomonas aeruginosa.

We investigated the effect of FeSO4 on phagocytosis-associated, increased oxidative metabolism via the hexose monophosphate shunt, with special attention to its effect on H2O2 levels. The availability of glutathione peroxidase and glutathione reductase for H2O2 disposal and hexose monophosphate shunt stimulation also are evaluated. The results show an impairment of phagocytosis-associated hexose monophosphate shunt activity together with an increase both of resting and phagocytosing formate oxidation. These apparently paradoxical findings are resolved by demonstrating a direct enhancement of formate oxidation by FeSO4 in a cell-free system. In addition, measurement of H2O2 concentrations via scopoletin fluorescence shows reduction of H2O2 by FeSO4. There is no effect on either glutathione peroxidase or glutathione reductase activities. These data suggest that one mechanism of FeSO4 impairment of microbicidal activity is by its removal of H2O2.

Absorption↗