in tris-nacl-mgcl ( 2 ) buffer at ph7.7 and 37 degrees c , the rate constants for the dissociation of the antibiotic-enzyme complexes were 2.8x10 ( -6 ) , 1.5x10 ( -6 ) and 0.63x10 ( -6 ) s ( -1 ) ( half-lives 70 , 130 and 300h ) for benzylpenicillin , cephalosporin 87-312 and cephaloridine respectively .
C3536856
cephalosporin
C0007727
cephaloridine