UV light-induced survival response in a highly radiation-resistant isolate of the Moraxella-acinetobacter group
A highly radiation-resistant member of the Moraxella-Acinetobacter group, isolate 4, obtained from meat, was studied to determine the effect of preexposure to UV radiation on subsequent UV light resistance. Cultures that were preexposed to UV light and incubated for a short time in plate count broth exhibited increased survival of a UV light challenge dose. This response was inhibited in the presence of chloramphenicol. Frequencies of mutation to streptomycin, trimethoprim, and sulfanilamide resistance remained the same after the induction of this survival response and were not altered by treatment with mutagens, with the exception of mutation to streptomycin resistance after ..gamma..-irradiation or nitrosoguanidine or methyl methane sulfonate treatment. The results indicated that isolate 4 has a UV light-inducible UV light resistance mechanism which is not associated with increased mutagenesis. The characteristics of the radiation resistance response in this organism are similar to those of certain other common food contaminants. Therefore, considered as part of the total microflora of meat, isolate 4 and the other radiation-resistant Moraxella-Acinetobacter isolates should not pose unique problems in a proposed radappertizaton process.
- Research Organization:
- Univ. of Nebraska, Lincoln
- OSTI ID:
- 5654529
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Vol. 43:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
60 APPLIED LIFE SCIENCES
BACTERIA
RADIOSENSITIVITY
FOOD
PRESERVATION
MEAT
RADIOPRESERVATION
RESPONSE MODIFYING FACTORS
BIOLOGICAL EFFECTS
ULTRAVIOLET RADIATION
ELECTROMAGNETIC RADIATION
IRRADIATION
MICROORGANISMS
RADIATIONS
560132* - Radiation Effects on Microorganisms- Food Preservation- (-1987)
553000 - Agriculture & Food Technology