two parenterally administered cephalosporins ( cephalothin and cephapirin ) and four orally administered cephalosporins ( cephalexin , cephradine , cefatrizine , and cefaclor ) were investigated by use of 29 beta-lactamase-producing strains of staphylococcus aureus for determination of their relative rates of hydrolysis ( rh ) by beta-lactamase ( rh of penicillin g =100 ) and their antistaphylococcal activities .
C3536856
cephalosporins
C0007738
cephradine