BacteriaCephalosporinsCephalosporin Resistancebeta-LactamasesAnti-Bacterial AgentsMicrobial Sensitivity TestsCephaloridineCephalosporinaseCefotaximeCephalexinCefiximebeta-LactamsPenicillinsCeftriaxoneCephalothinCefmenoximebeta-Lactam ResistanceCefotiamEnterobacteriaceaeCeftazidimeCeftizoximeCephradineEnterobacterCefazolinKlebsiella pneumoniaeDrug Resistance, MicrobialPenicillinaseAztreonamEnterobacteriaceae InfectionsCefoxitinGram-Negative BacteriaCefamandolePenicillin ResistanceCephamycinsDrug Resistance, BacterialKlebsiellaCefaclorCefoperazoneCarbapenemsCefmetazoleCefadroxilEscherichia coliKlebsiella InfectionsMoxalactamAmpicillinDrug Resistance, Multiple, BacterialIsoelectric FocusingEnterobacter cloacaeCefotetanPenicillin GBacterial InfectionsStructure-Activity RelationshipCephaloglycinCefuroximeClavulanic AcidCross InfectionCefatrizineLactamsPenicillanic AcidCloxacillinGonorrheaChemistryNeisseria gonorrhoeaeImipenemChemical PhenomenaCefsulodinGram-Positive BacteriaGram-Negative Bacterial InfectionsPenicillin-Binding ProteinsMonobactamsEscherichia coli InfectionsDrug UtilizationCitrobacterThienamycinsHydrolysisProteusProteus vulgarisProteus mirabilisClavulanic AcidsMagnetic Resonance SpectroscopyKineticsCitrobacter freundiiBacterial ProteinsPenicillin VPiperacillinProvidenciaAminoglycosidesPseudomonas aeruginosaDNA, BacterialPlasmidsConjugation, GeneticSalmonella paratyphi AStreptococcus pneumoniaeStereoisomerismMolecular Sequence DataFluoroquinolonesDrug StabilitySulbactamCephapirinElectrophoresis, Gel, Pulsed-Field