Pharmacological Analysis of Dopamine Action on the Isolated Dog Atrium

Pharmacological analysis of dopamine action on the isolated dog atrium.

The isolated right atrium of the dog was perfused with arterial blood introduced from a carotid artery of a support dog. The selective injection of dopamine, tyramine and norepinephrine into the cannulated sinus node artery induced dose-relatedly positive chronotropic and inotropic effects. However, for an equal increase in sinus rate, dopamine caused less increase in tension development than n...

Adenosine-guanosine interactions in the isolated dog atrium.

Pharmacologic analysis of stretch-induced sinus acceleration of the isolated dog atrium.

Using isolated, blood-perfused atrium preparation of the dogs, the effect of stretch on sinus rate was studied in 11 preparations. Stretching usually produced sinus acceleration in all 11 spontaneously beating atria. Within a range of 0--30 Gm, greater degrees of stretch produced greater degrees of sinus acceleration. During maintained stretch sinus rate slightly reduced but not to the control ...

content analysis of l1 and l2 writing textbooks and the perception analysis of university professors on the influence of english writing expertise on the persian in an efl context

the importance of writing as a complex skill in applied linguistics has drawn the attention of many researchers to evaluate textbooks in order to help learners gain self-sufficiency and autonomy in the field of language use and communication. investigations have shown that developments in textbooks evaluation can promote the quality of pedagogies and consequently the learning. this study attemp...

the effect analysis of proficiency on language - switching in iranian efl learners writing

abstract in a protocol analysis of second language writing from 20 adult english as a foreign language (efl) iranian students, this research observed how language-switching (l-s), i.e., first language use in l2 writing, was affected by l2 proficiency. switching interactively between first (l1) and second (l2) languages has been recognized as one of the salient characteristics of l2 writing....