CephalosporinsSmall Molecule LibrariesDrug DiscoveryPharmaceutical PreparationsDrug DesignCephalosporin Resistancebeta-LactamasesAnti-Bacterial AgentsMicrobial Sensitivity TestsCephaloridineCephalosporinaseCefotaximeCephalexinCefiximebeta-LactamsPenicillinsCeftriaxoneCephalothinCefmenoximebeta-Lactam ResistanceEnterobacteriaceaeCefotiamBacteriaCeftazidimeCeftizoximeCephradineEnterobacterCefazolinKlebsiella pneumoniaeDrug Resistance, MicrobialPenicillinaseAztreonamCell Adhesion MoleculesEnterobacteriaceae InfectionsGram-Negative BacteriaCefoxitinEscherichia coliCefamandolePenicillin ResistanceCephamycinsDrug Resistance, BacterialKlebsiellaStructure-Activity RelationshipCefaclorMolecular Sequence DataCefoperazoneCarbapenemsCefmetazoleCefadroxilIsoelectric FocusingKlebsiella InfectionsAmpicillinMoxalactamDrug Resistance, Multiple, BacterialEnterobacter cloacaeBacterial InfectionsPenicillin GCefotetanKineticsAmino Acid SequenceCephaloglycinCefuroximeClavulanic AcidCross InfectionLactamsCefatrizineBacterial ProteinsPenicillanic AcidHydrolysisNeisseria gonorrhoeaeGonorrheaCloxacillinImipenemGram-Positive BacteriaGram-Negative Bacterial InfectionsCefsulodinPlasmidsPenicillin-Binding ProteinsEscherichia coli InfectionsMonobactamsDrug UtilizationChemistryCitrobacterChemical PhenomenaProtein BindingThienamycinsDNA, BacterialModels, MolecularBase SequenceProteusPseudomonas aeruginosaProteus vulgarisProteus mirabilisClavulanic AcidsCitrobacter freundiiAminoglycosidesPenicillin VBinding SitesProvidenciaPiperacillin