utilizing radioactive uptake experiments , the cellular to extracellular concentration ratios were determined to be less than one for all cephalosporins at 10 and 120 min : cefotaxime ( 0.08 +/- 0.02 , 0.34 +/- 0.08 ) , ceftizoxime ( 0.21 +/- 0.11 , 0.52 +/- 0.18 ) , ceftriaxone ( 0.12 +/- 0.04 , 0.38 +/- 0.23 ) , and n-formimidoyl thienamycin ( 0.18 +/- 0.09 , 0.33 +/- 0.14 ) .
C3536856
cephalosporins
C0007560
ceftizoxime