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	Provedor de dados Neotropical Ichthyology (1) Autor Costa,Monica Jones (1) Kalinin,Ana Lúcia (1) Rantin,Francisco Tadeu (1) Palavra-chave Excitation-contraction coupling (1) Ryanodine (1) Sarcoplasmic reticulum (1) Ventricle strips (1) Tipo do documento Info:eu-repo/semantics/article (1) Ano 2009 (1) País Brazil (1) Idioma Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 1 Primeira ... 1 ... Última Differences in Ca2+-management between the ventricle of two species of neotropical teleosts: the jeju, Hoplerythrinus unitaeniatus (Spix & Agassiz, 1829), and the acara, Geophagus brasiliensis (Quoy & Gaimard, 1824) Neotropical Ichthyology Costa,Monica Jones; Rantin,Francisco Tadeu; Kalinin,Ana Lúcia. This study analyzed the physiological role of the cardiac sarcoplasmic reticulum (SR) of two neotropical teleosts, the jeju, Hoplerythrinus unitaeniatus (Erythrinidae), and the acara, Geophagus brasiliensis (Cichlidae). While the in vivo heart frequency (fH - bpm) of acara (79.6 ± 6.6) was higher than that of the jeju (50.3 ± 2.7), the opposite was observed for the ventricular inotropism (Fc - mN/mm²) at 12 bpm (acara = 28.66 ± 1.86 vs. jeju = 36.09 ± 1.67). A 5 min diastolic pause resulted in a strong potentiation of Fc (≅ 90%) of strips from jeju, which was completely abolished by ryanodine. Ryanodine also resulted in a ≅ 20% decrease in the Fc developed by strips from jeju at both subphysiological (12 bpm) and physiological (in vivo) frequencies.... Tipo: Info:eu-repo/semantics/article Palavras-chave: Excitation-contraction coupling; Ryanodine; Sarcoplasmic reticulum; Ventricle strips. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300015 Registros recuperados: 1 Primeira ... 1 ... Última

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