Cephalosporin ResistanceCephalosporinsCefotaximeMicrobial Sensitivity Testsbeta-LactamasesAnti-Bacterial AgentsCefuroximeAcremoniumEnterobacteriaceae InfectionsPenicillin-Binding Proteinsbeta-Lactam ResistanceDrug Resistance, BacterialCephalexinCephalosporinaseGram-Positive Bacterial InfectionsDrug Resistance, MicrobialEscherichia coliCeftriaxoneEnterococcus faecalisCephalothinBacteriaCefmenoximeCephaloridineCeftizoximeBacterial ProteinsPenicillin AmidaseDNA, BacterialPlasmidsCefazolinEnterobacteriaceaeDrug ResistanceCefiximeCefaclorPenicillinsCefamandoleCeftazidimeBacterial InfectionsGram-Negative BacteriaGram-Positive BacteriaEnterobacterPenicillin ResistanceCefonicidDrug Resistance, Multiple, BacterialDrug StabilityCephradinePenicillinaseCefotiamDrug Resistance, NeoplasmMuramoylpentapeptide CarboxypeptidaseDrug Resistance, MultipleAcetylesteraseDisease ResistanceMolecular Sequence DataPeptidyl TransferasesHexosyltransferasesAmpicillinStaphylococcus aureusMutationPenicillin Gbeta-LactamsPseudomonas aeruginosaCefoxitinCefoperazoneKlebsiella pneumoniaeCefsulodinCephapirinVascular ResistancePseudomonasAmino Acid SequenceCephamycinsChemistryDrug Resistance, ViralKineticsAnti-Infective AgentsChemical PhenomenaCefotetanKlebsiellaMethicillin ResistancePenicillanic AcidStaphylococcusHydrolysisAztreonamMice, Inbred ICRFleroxacinStreptococcus pneumoniaeLactamsKlebsiella InfectionsCulture MediaFluoroquinolonesNeisseria gonorrhoeaeProteusStructure-Activity RelationshipAminoglycosides