[Direct action of some substances of biological interest on isolated rabbit atria].
D000818:Animals; D003067:Coenzymes / Q000494:pharmacology*; D006321:Heart / Q000494:pharmacology*; D006325:Heart Atria; D009525:Niacin / Q000031:analogs & derivatives; D009539:Nicotinic Acids; D011817:Rabbits
D003067:Coenzymes; D009539:Nicotinic Acids; D009525:Niacin
COENZYMES/pharmacology; HEART/pharmacology; NICOTINIC ACID/related compounds