Effect of physiological age on radiation resistance of some bacteria that are highly radiation resistant. [Micrococcus radiodurans; Micrococcus sp. isolate C-3; Moraxella sp isolate 4; Escherichia coli]
Journal Article
·
· Appl. Environ. Microbiol.; (United States)
OSTI ID:6600370
Physiological age-dependent variation in radiation resistance was studied for three bacteria that are highly radiation resistant: Micrococcus radiodurans, Micrococcus sp. isolate C-3, and Moraxella sp. isolate 4. Stationary-phase cultures of M. radiodurans and isolate C-3 were much more resistant to gamma radiation than were log-phase cultures. This pattern of relative resistance was reversed for isolate 4. Resistance of isolate 4 to UV light was also greater during log phase, although heat resistance and NaCl tolerance after heat stresses were greater during stationary phase. Radiation-induced injury of isolate 4 compared with injury of Escherichia coli B suggested that the injury process, as well as the lethal process, was affected by growth phase. The hypothesis that growth rate affects radiation resistance was tested, and results were interpreted in light of the probable confounding effect of methods used to alter growth rates of bacteria. These results indicate that dose-response experiments should be designed to measure survival during the most resistant growth phase of the organism under study. The timing is particularly important when extrapolations of survival results might be made to potential irradiation processes for foods. 17 references.
- Research Organization:
- Univ. of Nebraska, Lincoln
- OSTI ID:
- 6600370
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Journal Name: Appl. Environ. Microbiol.; (United States) Vol. 47:5; ISSN AEMID
- 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.
AGE DEPENDENCE
ANIMAL GROWTH
BACTERIA
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
COMPARATIVE EVALUATIONS
DOSE-RESPONSE RELATIONSHIPS
DOSES
ELECTROMAGNETIC RADIATION
FOOD
GAMMA RADIATION
GROWTH
INJURIES
IONIZING RADIATIONS
LETHAL DOSES
LETHAL RADIATION DOSE
LIFE CYCLE
MICROORGANISMS
RADIATION DOSES
RADIATION EFFECTS
RADIATION INJURIES
RADIATIONS
RADIOSENSITIVITY
RADIOSTERILIZATION
STERILIZATION
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AGE DEPENDENCE
ANIMAL GROWTH
BACTERIA
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
COMPARATIVE EVALUATIONS
DOSE-RESPONSE RELATIONSHIPS
DOSES
ELECTROMAGNETIC RADIATION
FOOD
GAMMA RADIATION
GROWTH
INJURIES
IONIZING RADIATIONS
LETHAL DOSES
LETHAL RADIATION DOSE
LIFE CYCLE
MICROORGANISMS
RADIATION DOSES
RADIATION EFFECTS
RADIATION INJURIES
RADIATIONS
RADIOSENSITIVITY
RADIOSTERILIZATION
STERILIZATION