Strains of Bacillus cereus differing in penicillinase production were shown to possess cell walls of differing muramic acid contents.

An enzyme-linked immunosorbent assay (ELISA) for progesterone measurement in serum or plasma samples using penicillinase as label enzyme is reported. A C3 and C11 derivatives of progesterone were prepared and conjugated to bovin serum albumin (BSA). Polyclonal antibody against these two immunogens were prepared in New Zealand white rabbits. Purified Ig fractions of antibodies were immobilized o...

Two strains of Staphylococcus aureus (PC1 and 196E), when grown in medium containing 0.002% sodium dodecyl sulfate (SDS), showed from 96.1 to 100% loss of the ability to produce penicillinase. Resistance to cadmium and zinc was lost concomitantly with the ability to produce penicillinase. A comparison of the rate of curing by SDS with the curing effects exerted by elevated temperature and ethid...

Results of three quality control trials of antibiotic sensitivity testing carried out on staphylococci by the Birmingham Regional Bacteriologists Group are presented. An overall reduction in the number of discrepant results from 5.2 to 1.2% when retesting the same organisms was thought to be due largely to the alteration in methods of testing for resistance to neomycin- and penicillinase-resist...

A strain of Staphylococcus aureus resistant to ethidium bromide is described. The genetic determinants for the resistance are present on the same plasmid as the penicillinase genes.