title: [Diurnal pH changes in the duodenum and their physiological significance (author's transl)].
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D004285:Dogs; D004386:Duodenum / Q000378:metabolism*; D005769:Gastrointestinal Motility; D006863:Hydrogen-Ion Concentration; D013270:Stomach / Q000502:physiology