Breath TestsMethaneHydrogenHydrogen BondingHydrogen PeroxideLactuloseHelicobacter InfectionsHelicobacter pyloriCarbon IsotopesUreaGastric EmptyingHydrogen SulfideMethylococcaceaeAminopyrineCaprylatesLactose IntoleranceCarbon DioxideAnti-Ulcer AgentsExhalationCarbon RadioisotopesDyspepsiaOmeprazoleMethylococcus capsulatusClarithromycinEuryarchaeota2-PyridinylmethylsulfinylbenzimidazolesOxygenasesAmoxicillinBismuthGastrointestinal TransitUreaseLactose Tolerance TestTinidazoleMetronidazoleEthaneChylomicron RemnantsMalabsorption SyndromesLansoprazoleLiver Function TestsFalse Negative ReactionsSensitivity and SpecificityDrug Therapy, CombinationSulfoxidesOxidation-ReductionAcetamidesTime FactorsBlind Loop SyndromeDuodenal UlcerMethylosinus trichosporiumPeptic UlcerProspective StudiesIntestine, SmallAnti-Bacterial AgentsArchaeaMethylocystaceaeTreatment OutcomeGastroparesisFurazolidoneLactoseFlatulenceRanitidineRabeprazoleMethanolIleocecal ValveBacteriaAnaerobiosisAcetatesSpectrophotometry, InfraredFecesHydrogen CyanideGasesProton Pump InhibitorsStomachIrritable Bowel SyndromeReproducibility of ResultsDNA, ArchaealFermentationRespirationGeologic SedimentsGastroscopyGastrointestinal MotilityPentanesAntitrichomonal AgentsLoperamideDouble-Blind MethodMineral WatersBreath HoldingSpirulinaPredictive Value of TestsMethanosarcinalesChromatography, GasAcetic AcidEndoscopy, GastrointestinalExocrine Pancreatic InsufficiencyFollow-Up StudiesGastritisHydrogen-Ion ConcentrationPhenolsulfonphthaleinSteatorrheaDihydropyrimidine Dehydrogenase Deficiency