CephalosporinsAnti-Bacterial AgentsMicrobial Sensitivity TestsPenicillinsCephalosporin Resistancebeta-LactamasesCephalexinCephalosporinaseCephaloridineCefotaximeBacteriaCephalothinEnterobacteriaceaeCefiximebeta-LactamsDrug Resistance, MicrobialCeftriaxonePenicillinaseCefazolinEnterobacterCefmenoximeCephamycinsCefoxitinbeta-Lactam ResistanceKlebsiellaCefotiamProteusCeftazidimeCefamandolePenicillin ResistanceBacterial InfectionsCeftizoximeCephradineStructure-Activity RelationshipAmpicillinCefoperazoneGram-Negative BacteriaKlebsiella pneumoniaeCarbenicillinAztreonamAminoglycosidesChemistryGram-Positive BacteriaChemical PhenomenaEscherichia coliPenicillin GEnterobacteriaceae InfectionsCloxacillinHydroxyethylrutosideButirosin SulfateDrug Resistance, BacterialCefaclorGentamicinsTicarcillinCarbapenemsCefmetazoleCefadroxilPseudomonas aeruginosaHarringtoninesSisomicinProvidenciaStaphylococcusPenicillin AmidaseKanamycinDrug StabilityKlebsiella InfectionsMoxalactam