LactamsDrug ResistanceCyclizationDrug Resistance, MicrobialDrug Resistance, BacterialDrug Resistance, Neoplasmalpha-MSHAnti-Bacterial Agentsbeta-LactamsHeterocyclic Compounds, 1-RingDrug Resistance, MultipleMuramic AcidsDisease ResistanceVascular ResistanceMicrobial Sensitivity TestsDrug Resistance, ViralDrug Resistance, Multiple, BacterialStereoisomerismMolecular StructurePenicillin ResistanceCyclacillinAminationCleomeReceptors, MelanocortinTetracycline ResistanceAminoglycosidesMolecular Sequence DataMutationBacterial ProteinsStreptothricinsIminesPlant DiseasesSuperinfectionDrug Resistance, FungalAirway ResistanceMacrolidesStreptomycesPenicillinsCarboxylic AcidsStructure-Activity RelationshipAlkenesbeta-Lactam ResistanceDrug DesignResistance TrainingAmidesMagnetic Resonance SpectroscopyAza CompoundsPeptides, CyclicR FactorsChromatography, PaperImmunity, InnateCephalosporinsDNA, BacterialP-GlycoproteinBicyclo Compounds, HeterocyclicEscherichia coliAmpicillin ResistanceChloramphenicol ResistancePeptidoglycanIndium RadioisotopesModels, Molecular