LactamsCephalosporinsAnti-Bacterial Agentsbeta-LactamsCephalosporin ResistanceMicrobial Sensitivity Testsbeta-LactamasesCyclizationCephaloridineCephalosporinasePenicillinsCefotaximeCephalexinCefiximealpha-MSHCeftriaxoneCephalothinCefmenoximeHeterocyclic Compounds, 1-Ringbeta-Lactam ResistanceCefotiamEnterobacteriaceaeCeftazidimePenicillin ResistanceMuramic AcidsCeftizoximeBacteriaCephradineEnterobacterCefazolinKlebsiella pneumoniaeDrug Resistance, MicrobialPenicillinaseStereoisomerismAztreonamStructure-Activity RelationshipMolecular StructureEnterobacteriaceae InfectionsCefoxitinGram-Negative BacteriaCefamandoleCyclacillinCephamycinsAminoglycosidesAminationDrug Resistance, BacterialCleomeKlebsiellaCefaclorReceptors, MelanocortinCefoperazoneCarbapenemsCefmetazoleCefadroxilKlebsiella InfectionsMoxalactamAmpicillinEscherichia coliHydrolysisDrug Resistance, Multiple, BacterialIsoelectric FocusingEnterobacter cloacaeCefotetanPenicillin GBacterial InfectionsCephaloglycinCefuroximeClavulanic AcidMagnetic Resonance SpectroscopyCross InfectionStreptomycesCefatrizinePenicillanic AcidIminesCloxacillinGonorrheaBacterial ProteinsStreptothricinsNeisseria gonorrhoeaeImipenemSuperinfectionCefsulodinGram-Positive BacteriaGram-Negative Bacterial InfectionsPenicillin-Binding ProteinsMonobactamsEscherichia coli InfectionsDrug UtilizationChemistryChemical PhenomenaCitrobacterThienamycinsProteusAlkenesProteus vulgarisCarboxylic AcidsProteus mirabilisClavulanic AcidsIndicators and ReagentsPeptidoglycan