Comparative viability of unirradiated and gamma irradiated bacterial cells

Journal Article · Sat Jan 01 00:00:00 EST 1977 · J. Food Sci.; (United States)

DOI:https://doi.org/10.1111/j.1365-2621.1977.tb12665.x· OSTI ID:7323880

Maxcy, R B

Gamma radiation injured Escherichia coli, Salmonella typhimurium, and Moraxella sp. were studied under various environmental stresses to determine their fate relative to the parent population. Irradiated cultures formed smaller colonies on surface plates with fewer cells per colony. Unirradiated cultures had a shorter lag phase than irradiated cultures in broth and duration of lag increased as a result of increasing the radiation dose. Repeated irradiation and subculture progressively retarded growth rate. Multiple radiation of highly resistant Moraxella sp. showed radiation injured cells to be more sensitive than uninjured cells. With the three species studied, irradiation raised the lower limits of growth temperature, increased the sensitivity to freezing and thawing, and increased the susceptibility to lowered water activity. This work indicated that the production of a bizarre, resistant strain of bacteria through recycling in a food processing operation is highly unlikely.

• Research Organization: Univ. of Nebraska, Lincoln
• OSTI ID: 7323880
• Journal Information: J. Food Sci.; (United States), Vol. 42:4
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BACTERIA
BIOLOGICAL RADIATION EFFECTS
SURVIVAL TIME
CELL CULTURES
DOSE-RESPONSE RELATIONSHIPS
ESCHERICHIA COLI
GAMMA RADIATION
SALMONELLA TYPHIMURIUM
BIOLOGICAL EFFECTS
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MICROORGANISMS
RADIATION EFFECTS
RADIATIONS
SALMONELLA
560131* - Radiation Effects on Microorganisms- Basic Studies- (-1987)