Superoxide dismutase and the oxygen enhancement of radiation lethality. [X radiation, Escherichia coli]
Journal Article
·
· Arch. Biochem. Biophys.; (United States)
Escherichia coli B were more susceptible to radiation lethality and showed a greater oxygen enhancement ratio when exposed in dilute suspension (1 x 10/sup 5/ cells/ml) than when exposed in dense suspensions (1 x 10/sup 9/ CELLS/ml). The oxygen enhancement, seen with dilute suspensions, was diminished by superoxide dismutase, catalase, mannitol, or histidine. Heat-denatured superoxide dismutase was without effect. The results are interpreted as indicating a role for O/sub 2//sup -/ plus H/sub 2/O/sub 2/ in the oxygen enhancement of radiation lethality, and a scheme is proposed which is consistent with the observations.
- Research Organization:
- Duke Univ., Durham, NC
- OSTI ID:
- 7216548
- Journal Information:
- Arch. Biochem. Biophys.; (United States), Journal Name: Arch. Biochem. Biophys.; (United States) Vol. 176; ISSN ABBIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
560131* -- Radiation Effects on Microorganisms-- Basic Studies-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BACTERIA
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
CATALASE
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENZYMES
ESCHERICHIA COLI
FLUIDS
IONIZING RADIATIONS
IRRADIATION
LETHAL IRRADIATION
MICROORGANISMS
NONMETALS
OXIDOREDUCTASES
OXYGEN
OXYGEN ENHANCEMENT RATIO
RADIATION EFFECTS
RADIATIONS
X RADIATION
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BACTERIA
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
CATALASE
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENZYMES
ESCHERICHIA COLI
FLUIDS
IONIZING RADIATIONS
IRRADIATION
LETHAL IRRADIATION
MICROORGANISMS
NONMETALS
OXIDOREDUCTASES
OXYGEN
OXYGEN ENHANCEMENT RATIO
RADIATION EFFECTS
RADIATIONS
X RADIATION