title: [Effect of various concentrations of calcium ions and the frequency of stimulation of papillary muscles of the heart of mature and old rats on its contractile capability].
authors.forename: D A
authors.initials: DA
authors.lastname: Efimov
mesh_terms: D000818:Animals; D002118:Calcium / Q000502:physiology*; D009200:Myocardial Contraction; D010210:Papillary Muscles / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D002118:Calcium
vernacular_title: Vliianie razlichnykh kontsentratsiĭ ionov kal'tsiia i chastoty stimuliatsii papilliarnoĭ myshtsy serdtsa vzorslykh i starykh krys na ee sokratitel'nuiu sposobnost'.