Spectrometry, Mass, Electrospray IonizationMass SpectrometryTandem Mass SpectrometryChromatography, LiquidSpectroscopy, MossbauerIonsFractionation, Field FlowGasesChromatography, High Pressure LiquidLimit of DetectionEnkephalin, LeucineSolid Phase ExtractionSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationDeuteriumComplex MixturesGas Chromatography-Mass SpectrometryReference StandardsMetabolomicsProteomicsMolecular StructureIndicators and ReagentsMagnetic Resonance SpectroscopyFourier AnalysisReproducibility of ResultsPeptidesIsomerismFerrous CompoundsCounterfeit DrugsNanotechnologyIsotachophoresisCyclotronsSulfoglycosphingolipidsEthylenethioureaCadmium RadioisotopesCalibrationSensitivity and SpecificityAminobiphenyl CompoundsMagneticsSpectrum AnalysisSulfite OxidaseAmino Acid SequenceAtmospheric PressureIron IsotopesElectronsProteomeMolecular Sequence DataProtonsMetalloporphyrinsOxygen IsotopesElectron Spin Resonance SpectroscopyProteinsLiquid-Liquid ExtractionMyoglobinModels, ChemicalSpectroscopy, Fourier Transform InfraredSpectrometry, Mass, Secondary IonWaterQuantum TheoryTrypsinCattleEquipment Failure AnalysisChromatography, Reverse-PhaseModels, MolecularSequence Analysis, ProteinIronMetabolomeMolecular ConformationPhysicochemical PhenomenaChemistry, PhysicalPhosphatidylcholinesIsotope LabelingChemical FractionationFerric CompoundsMathematicsPeptide FragmentsAnionsIron-Sulfur ProteinsGlycopeptidesPeptide MappingSubstance Abuse DetectionEquipment DesignLipid BilayersOxidation-ReductionDrugs, Chinese HerbalElectrochemistryElectrophoresis, Gel, Two-DimensionalPharmaceutical PreparationsDrug StabilityStatic ElectricityGlycosylationStereoisomerismOligosaccharidesDatabases, ProteinComputer SimulationAlgorithmsNitrogenCarbohydrate SequenceHydrogen BondingChromatography, GasPrincipal Component Analysis