Hydrogen-Ion ConcentrationGastric Acidity DeterminationElectrodesAcid-Base EquilibriumHydrogenCarbon DioxideBicarbonatesElectrochemistryPotentiometryOxidation-ReductionHydrogen BondingHydrogen PeroxideFerredoxinsHydrogen SulfideElectron Spin Resonance SpectroscopyElectrodes, ImplantedSpectrophotometryPotassiumSodiumProtonsCalciumBuffersIon-Selective ElectrodesAcidosisChloridesIonsKineticsIon ChannelsHydrochloric AcidOsmolar ConcentrationMembrane PotentialsAcidosis, RespiratoryGastric JuiceMagnesiumWaterAcetazolamidePartial PressureAcidosis, Renal TubularIon TransportModels, MolecularAlkalosis, RespiratoryCell Membrane PermeabilityBiological Transport, ActiveAmmonium ChlorideElectrophysiologyTime FactorsMicroelectrodesExtracellular SpaceOxygenTemperatureSecretory RateModels, ChemicalElectrochemical TechniquesHydrogen CyanideSodium ChloridePotassium ChlorideTurtlesHelix (Snails)Models, BiologicalMetalsSodium BicarbonateElectric ConductivityDogsPhosphatesCations, MonovalentIon Channel GatingAcidsCationsThermodynamicsProtein ConformationElectric StimulationBinding SitesSolutionsCatalaseOxidantsMolecular Sequence DataCobaltDeuterium Exchange MeasurementLactatesMagnetic Resonance SpectroscopyHypercapniaSodium-Hydrogen AntiporterBiosensing TechniquesCatsCations, DivalentNeuronsAmilorideCatalysisMathematicsGraphiteGastric MucosaSulfatesFluorocarbon PolymersIonophoresAequorinDinitrophenolsMembranes, ArtificialCrystallography, X-RayAction PotentialsManganese