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Effects of seasonal acclimatization on temperature dependence of cardiac excitability in the roach, Rutilus rutilus
Seasonal acclimatization of the electrical excitability of the eurythermal roach increases pumping capacity of the roach heart by maximizing heart rate, but without compromising the stability of cardiac excitation. Expand
Effects of seasonal acclimatization on action potentials and sarcolemmal K+ currents in roach (Rutilus rutilus) cardiac myocytes.
Findings show that thermal tolerance limits of K+ currents in isolated myocytes between seasonally acclimatized roach are much less pronounced than the heat sensitivity of ECG variables in intact fish. Expand
Effects of seasonal acclimatization on thermal tolerance of inward currents in roach (Rutilus rutilus) cardiac myocytes
The response of sodium (INa) and calcium (ICa) currents in heat tolerance of cardiac excitability was examined in a eurythermic fish and the response of INa to seasonal acclimatization conforms to the TDEE hypothesis. Expand
Effect of changes in temperature on the force–frequency relationship in the heart of catfish (Clarias gariepinus)
It can be concluded that the catfish myocardium, like most fish hearts exhibits a negative force–frequency relationship, but, this relationship is highly affected by the changes in the temperature in a way that the lower temperature and the higher temperature, may provide a protective mechanism against the depressive effects of higher stimulation frequency. Expand
Electrical excitability of roach ( Rutilus rutilus) ventricular myocytes: effects of extracellular K+, temperature, and pacing frequency.
Although high [K+]o antagonizes the negative effects of high temperature on excitation threshold, the precipitous depression of the rate of AP upstroke and complete loss of excitability in some myocytes suggest that the combination of highTemperature and high [ K+]O will severely impair ventricular excitabilityIn roach. Expand
Temperature dependence of cardiac sarcoplasmic reticulum and sarcolemma in the ventricle of catfish (Clarias gariepinus)
Abstract The present study was undertaken to examine the relative contribution of the SR-Ca 2+ release and sarcolemmal Ca 2+ channels in developing the cardiac force at two different temperatures (20Expand
Stress concentration factors for pressurized elliptic crossbores in blocks—Part II—Effect of block geometry
  • A. Badr
  • Materials Science
  • 11 May 2009
The stress concentration point at the intersection of elliptical crossbores in rectangular blocks has been investigated. Again, the results showed that elliptical crossbores intersection produceExpand
Cardiac Toxicity of Cadmium Involves Complex Interaction Between Multiple Ion Currents in Rainbow Trout (Oncorhynchus mykiss) Ventricular Myocytes.
Investigation of the effects of Cd2+ on ventricular action potentials and major ion currents in the rainbow trout ventricular myocytes indicates that the cardiotoxicity of C d2+ in fish involves multiple ion currents that are directly and indirectly altered by Cd 2+ . Expand