the hydrolysis of cephalosporins containing good leaving groups at the 3'-position [ those used in this study were the chromogenic cephalosporin padac [ pyridine-2-azo-4'- ( n ' , n'-dimethylaniline ) substituted on cephalosporin ] , cephaloridine , and cephalothin ] , catalyzed by the staphylococcus aureus pc1 beta-lactamase , proceeds in two spectrophotometrically observable phases .
C3536856
cephalosporin
C0007727
cephaloridine