title: [Problems of direct assessment of the pH of the digestive system].
mesh_terms: D004064:Digestive System / Q000378:metabolism*; D005750:Gastric Juice / Q000032:analysis; D005753:Gastric Mucosa / Q000378:metabolism; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008722:Methods
vernacular_title: Problémy prímého mĕrení pH trávicího ústrojí.