title: Ultradian rhythms of gastric acidity.
abstract: Measurements of gastric pH and hydrogen ion concentration were made serially for six hours in five rhesus monkeys. Both pH and hydrogen ion concentration showed rapid fluctuations with periods approximating 90 minutes. These rhythms persisted in the face of continuous infusion with Pentagastrin, indicating that while gastrin release is sufficient to stimulate acid secretion, it is not the only mechanism of acid control.
mesh_terms: D000818:Animals; D005744:Gastric Acid / Q000502:physiology*; D005755:Gastrins / Q000502:physiology; D006863:Hydrogen-Ion Concentration; D008253:Macaca mulatta; D008297:Male; D010418:Pentagastrin / Q000494:pharmacology; D010507:Periodicity
chemical_list: D005755:Gastrins; D010418:Pentagastrin