title: Effect on the guinea-pig taenia coli of the substitution of strontium or  barium ions for calcium ions.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000200:Action Potentials; D000804:Angiotensin II / Q000494:pharmacology; D000818:Animals; D001464:Barium / Q000494:pharmacology*; D002118:Calcium / Q000494:pharmacology*; D003106:Colon / Q000187:drug effects*; D004837:Epinephrine / Q000494:pharmacology; D006168:Guinea Pigs; D006632:Histamine / Q000494:pharmacology; D007545:Isoproterenol / Q000494:pharmacology; D008564:Membrane Potentials; D013324:Strontium / Q000494:pharmacology*
chemical_list: D000804:Angiotensin II; D001464:Barium; D006632:Histamine; D007545:Isoproterenol; D000109:Acetylcholine; D002118:Calcium; D004837:Epinephrine; D013324:Strontium