Capillary ElectrochromatographyChromatography, LiquidMass SpectrometryChromatography, High Pressure LiquidCapillariesSpectrometry, Mass, Electrospray IonizationTandem Mass SpectrometryProteomicsElectrophoresis, CapillaryChromatography, AffinityChromatography, GasChromatography, Ion ExchangeChromatography, GelChromatographyChromatography, Thin LayerIonic LiquidsGene Expression Regulation, BacterialMolecular Sequence DataCapillary ActionBacterial ProteinsChromatography, Reverse-PhaseSpectrophotometry, UltravioletAmino Acid SequenceCulture MediaEscherichia coliGas Chromatography-Mass SpectrometrySigma FactorMolecular WeightElectrophoresis, Polyacrylamide GelCapillary PermeabilityHydrogen-Ion ConcentrationKineticsStereoisomerismCountercurrent DistributionReproducibility of Results