LactamsMonobactamsbeta-LactamsAnti-Bacterial AgentsCyclizationbeta-LactamasesMicrobial Sensitivity TestsCeftazidimealpha-MSHCephalosporinsHeterocyclic Compounds, 1-RingMuramic AcidsPseudomonas aeruginosaPseudomonas InfectionsStereoisomerismCyclacillinbeta-Lactam ResistanceMolecular StructureAminationCefoperazoneCleomeReceptors, MelanocortinGram-Negative BacteriaKlebsiella pneumoniaeEnterobacterAmikacinAminoglycosidesAzlocillinImipenemEnterobacteriaceaeEnterobacteriaceae InfectionsCephalosporinasePenicillinsTobramycinPiperacillinIsoelectric FocusingDrug Resistance, MicrobialIminesCefotaximeClavulanic AcidSkin Diseases, BacterialStreptothricinsKlebsiella InfectionsCarbapenemsSuperinfectionThienamycinsKlebsiellaDrug Therapy, CombinationCitrobacterAzabicyclo CompoundsPenicillin ResistanceHydrolysisAlkenesCarboxylic AcidsEscherichia coliAmdinocillinStreptomycesAmidesChromatography, High Pressure LiquidMagnetic Resonance SpectroscopyDrug DesignSerratia marcescensCephalosporin ResistanceCefoxitinStructure-Activity RelationshipSerratia InfectionsPeptides, CyclicChromatography, PaperGentamicinsEnterobacter cloacaeBacterial ProteinsAza CompoundsDrug Resistance, Multiple, BacterialDrug Resistance, BacterialBicyclo Compounds, HeterocyclicBacterial InfectionsIndium RadioisotopesTicarcillinKinetics