title: Catalase: its effect on microbial enumeration.
abstract: The addition of catalase to the surface of selective medium plates permitted increased enumeration of physically or chemically injured (stressed) microorganisms. Catalase acted by preventing the accumulation of hydrogen peroxide in, or around, injured cells. Heat-injured Staphylococcus aureus cells had decreased catalase activity, and heat-inactivated catalase had no effect on enumeration.
mesh_terms: D001419:Bacteria / Q000302:isolation & purification*; D002374:Catalase / Q000378:metabolism*; D003470:Culture Media; D004926:Escherichia coli / Q000302:isolation & purification; D005516:Food Microbiology; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000378:metabolism; D011551:Pseudomonas fluorescens / Q000302:isolation & purification; D011773:Pyruvates / Q000378:metabolism; D012486:Salmonella typhimurium / Q000302:isolation & purification; D012965:Sodium Chloride / Q000494:pharmacology; D013211:Staphylococcus aureus / Q000201:enzymology / Q000302:isolation & purification
chemical_list: D003470:Culture Media; D011773:Pyruvates; D012965:Sodium Chloride; D006861:Hydrogen Peroxide; D002374:Catalase