LactamsTetracyclineTetracyclinesTetracycline ResistanceCyclizationAnti-Bacterial AgentsOxytetracyclinealpha-MSHHeterocyclic Compounds, 1-RingMinocyclineDoxycyclinebeta-LactamsMicrobial Sensitivity TestsMuramic AcidsR FactorsDrug Resistance, MicrobialStereoisomerismChlortetracyclineDemeclocyclineMolecular StructureCyclacillinAminationCleomeReceptors, MelanocortinPenicillin ResistanceConjugation, GeneticErythromycinPenicillinsChloramphenicolEscherichia coliBacterial ProteinsDrug Resistance, BacterialIminesDNA Transposable ElementsStreptothricinsDNA, BacterialSuperinfectionDrug Resistance, Multiple, BacterialAminoglycosidesPlasmidsStreptomycesMacrolidesSpectinomycinCarboxylic AcidsStreptomycinAntiportersMethacyclineAlkenesStructure-Activity RelationshipGenes, BacterialMagnetic Resonance SpectroscopyAza CompoundsAmidesMolecular Sequence DataPeptides, CyclicDrug DesignNeisseria gonorrhoeaeBacteroidesChromatography, PaperAmpicillinCephalosporinsFurazolidoneBicyclo Compounds, HeterocyclicRolitetracyclineIndium RadioisotopesMetronidazole