Effect of selected solutes on growth and recovery of a radiation-resistant Moraxella
A highly radiation-resistant Moraxella sp. from beef was more resistant to gamma radiation in frozen beef than Clostridium botulinum 33A spores. Even though the Moraxella sp. was extremely radiation-resistant, its recovery after irradiation was markedly influenced by the plating medium. Fewer colony-forming units were recovered in Tryptic Soy Agar (TSA) than in Plate Count Agar (PCA), and differences in recovery became more pronounced with increasing radiation dose. Growth studies of the nonirradiated Moraxella sp. suggested the presence of dialyzable inhibitory factor(s) in Trypticase Soy Broth (TSB) and TSA. The low (0.5 percent) concentration of NaCl in TSA was shown to be mainly responsible for the slow growth and reduced recovery after irradiation. Reduced recovery was also obtained by plating the Moraxella sp. in PCA plus 0.5 percent NaCl or PCA plus 6 percent glucose after irradiation. It was noted that 2 other highly radiation-resistant isolates identified as Moraxella sp. gave similar results. Sensitivity to low solute concentrations, therefore, appeared to be a general phenomenon for this group.
- Research Organization:
- Univ. of Nebraska, Lincoln
- OSTI ID:
- 6367084
- Journal Information:
- J. Food Sci.; (United States), Vol. 43:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AGAR
RADIOSENSITIVITY EFFECTS
BIOLOGICAL RADIATION EFFECTS
BIOLOGICAL RECOVERY
MEAT
RADIOSTERILIZATION
MICROORGANISMS
RADIOSENSITIVITY
FREEZING
GAMMA RADIATION
IRRADIATION
NUTRIENTS
RADIOPRESERVATION
BIOLOGICAL EFFECTS
CARBOHYDRATES
COLLOIDS
DISPERSIONS
ELECTROMAGNETIC RADIATION
FOOD
IONIZING RADIATIONS
ORGANIC COMPOUNDS
POLYSACCHARIDES
PRESERVATION
RADIATION EFFECTS
RADIATIONS
RECOVERY
SACCHARIDES
STERILIZATION
560132* - Radiation Effects on Microorganisms- Food Preservation- (-1987)