Diethyl PyrocarbonateFormatesHistidineTriethyltin CompoundsHydroxylamineSulfuric Acid EstersEchinomycinCarbonatesHydroxylaminesHydrogen-Ion ConcentrationEtherKineticsDithionitrobenzoic AcidBinding SitesPhenylglyoxalSpectrophotometry, UltravioletChemistryChemical PhenomenaNucleic Acid ConformationEthyl EthersMolecular Sequence DataDNA, SuperhelicalBase SequenceMaleatesMutagenesis, Site-DirectedIndicators and ReagentsCatalysisSubstrate SpecificityEscherichia coliCysteineAmino Acid SequenceStructure-Activity Relationship