Catalase and superoxide dismutase activities after heat injury of listeria monocytogenes
Journal Article
·
· Appl. Environ. Microbiol.; (United States)
OSTI ID:6856094
Four strains of Listeria monocytogenes were examined for catalase (CA) and superoxide dismutase (SOD) activities. The two strains having the highest CA activities (LCDC and Scott A) also possessed the highest SOD activities. The CA activity of heated cell extracts of all four strains examined decreased sharply between 55 and 60/sup 0/C. SOD was more heat labile than CA. Two L. monocytogenes strains demonstrated a decline in SOD activity after heat treatment at 45/sup 0/C, whereas the other two strains demonstrated a decline at 50/sup 0/C. Sublethal heating of the cells at 55/sup 0/C resulted in increased sensitivity to 5.5% NaCl. Exogenous hydrogen peroxide was added to suspensions of L. monocytogenes; strains producing the highest CA levels showed the greatest H/sub 2/O/sub 2/ resistance.
- Research Organization:
- Univ. of Illinois, Urbana (USA)
- OSTI ID:
- 6856094
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Journal Name: Appl. Environ. Microbiol.; (United States) Vol. 54:2; ISSN AEMID
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
550700 -- Microbiology
560200* -- Thermal Effects
560300 -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CATALASE
ENZYME ACTIVITY
ENZYMES
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
OXIDOREDUCTASES
OXYGEN COMPOUNDS
PATHOGENS
PEROXIDASES
PEROXIDES
SENSITIVITY
SUPEROXIDE DISMUTASE
TEMPERATURE EFFECTS
TOLERANCE
560200* -- Thermal Effects
560300 -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CATALASE
ENZYME ACTIVITY
ENZYMES
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
OXIDOREDUCTASES
OXYGEN COMPOUNDS
PATHOGENS
PEROXIDASES
PEROXIDES
SENSITIVITY
SUPEROXIDE DISMUTASE
TEMPERATURE EFFECTS
TOLERANCE