Breath TestsHydrogenLactuloseLactose IntoleranceLactose Tolerance TestGastrointestinal TransitLactoseHydrogen BondingHydrogen PeroxideMalabsorption SyndromesMethanePneumatosis Cystoides IntestinalisColonic Diseases, FunctionalHydrogen SulfideFermentationDietary CarbohydratesIntestinal AbsorptionIleostomyColicLactaseGastric EmptyingMouthDisaccharidesRose BengalGastrointestinal MotilityLoperamideYogurtDigestionMilkCross-Over StudiesIntestine, SmallColonDietary FiberStarchFecesExhalationAbsorptionSucroseBlood GlucoseDiarrheaRosabeta-GalactosidaseTime FactorsPentanesBreath HoldingRespirationHydrogen CyanideCarbon DioxideCarbon IsotopesRespiratory MechanicsModels, MolecularVolatile Organic CompoundsUreaOxidation-ReductionTidal VolumeCatalaseOxidantsEthaneDeuterium Exchange MeasurementHelicobacter pyloriHelicobacter InfectionsHydrogen-Ion ConcentrationGasesOxygenKineticsCystathionine gamma-LyaseVolatilizationAcetoneCarbon MonoxideWaterPulmonary VentilationCrystallography, X-RayHalitosisSulfidesProtein ConformationHydrogenasePeroxidasesMagnetic Resonance SpectroscopyInhalationMass SpectrometryChromatography, GasModels, ChemicalMolecular Structure