Hydrochloric AcidMagnesiumMagnesium SulfateMagnesium DeficiencyPneumonia, AspirationNitric AcidGastric JuiceDecalcification TechniqueTrifluoroacetic AcidCountercurrent DistributionHydrogen-Ion ConcentrationMagnesium CompoundsEsophagusStomachAcidsMagnesium OxideFluoroacetatesAchlorhydriaParietal Cells, GastricGastric AcidSulfuric AcidsGastric FistulaSodium HydroxideAlkalosisGastric MucosaPentagastrinPepsin AAppendixAcidosisDuodenumSpectrophotometry, AtomicSodium ChlorideBicarbonatesSecretinStomach UlcerMagnesium HydroxideHydrolysis