Accession Number : AD0784832

Title :   Change in the Properties of Staphylococci after Repeated Gamma Radiation,

Corporate Author : ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER CHARLOTTESVILLE VA

Personal Author(s) : Tumanyan,M. A. ; Pershina,Z. G. ; Pavlova,I. B. ; Samoilenko,I. I.

Report Date : 20 JAN 1972

Pagination or Media Count : 15

Abstract : Repeated gamma-irradiation with subbactericidal doses of Staphylococcus aureus resulted in modification of its cultural, biochemical and other properties. Ultra-fine cell structure changed and cell radioresistance increased. A fall in enzyme activity, and impairment of hemolytic properties and a loss of virulence caused saprophytization of staphylococci. A comparison of ultra-fine structure in the parent staphylococci and in those with increased radioresistance revealed enlarged (2--2.5 fold) cell dimensions in the irradiated cultures, a disturbance of cell division and a disappearance of membrane structures typical for the patent culture. Despite the considerable changes in staphylococci with increased radioresistance their DNA base ratio was identical to that of the parent bacteria. (Author)

Descriptors :   *Gamma rays, *Staphylococcus aureus, *Radiation effects, Radiosterilization, Microbiology, Enzymes, Electron microscopy, Cultures(Biology), Sensitivity, Biochemistry

Subject Categories : Radiobiology
      Microbiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE