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T M Krol'

Publications and source records attributed to T M Krol'.

6 recordsLinked to original sources
PubMed1979

[Effect of the rest interval on the contractile activity of the myocardium].

Isolated strips of the heart auricles and ventricles of frogs at high stimulation frequencies revealed rest potentiation which depended both on the stimulation rhythm and on the duration of rest interval. Amphibians as well as warm-blooded animals and fish seem to display a possibility of Ca++ entering a cell during the period of rest via non-electrogenic calcium canals, but in amphibians this mechanism of the myocardium activation is compansatory, rather.

Animals↗
PubMed1977

[Analysis of chrono-inotropy of the myocardium in poikilothermic animals].

Chrono-ionotropic interrelationships were studied in isolated strips of the myocardium of poikilothermous animals (frogs and fishes) in conditions of either stationary or transitional regimens of stimulation. In the stationary regimen, the rhythm-strength relation is simple and corresponds to a parabolic curve. While changing the lesser frequency of stimulation for greater one, both the positive and negative transitional abbreviating stirs were observed, in contrast to literature references. The phenomena of positive and negative transitional stairs were concluded to be unrelated to species while being a general biological form of the myocardium response to change of the stimulation rhythm.

Animals↗
PubMedDate not supplied

[The "staircase" phenomenon in the myocardial activity of fishes and amphibians].

Studies have been made on chrono- and inotropic effects in the heart of the frog Rana temporaria and fishes Silurus glanis and Cyprinus carpio during stationary and transitional stimulation. In contrast to data in the literature, no interspecific differences were found in changes of the amplitude of cardiac contractions induced by changes in rhythmic stimulation.

Amphibians↗