title: Increase of cyclic adenosine monophosphate in Ba++-induced automaticity of frog heart apex.
mesh_terms: D000818:Animals; D001001:Anura; D001464:Barium / Q000494:pharmacology*; D002118:Calcium / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism*; D009200:Myocardial Contraction / Q000187:drug effects; D009206:Myocardium / Q000378:metabolism*; D011893:Rana esculenta
chemical_list: D001464:Barium; D000242:Cyclic AMP; D002118:Calcium