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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.
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Effects of seasonal acclimatization on action potentials and sarcolemmal K+ currents in roach (Rutilus rutilus) cardiac myocytes.

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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.
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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.
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Temperature dependence of cardiac sarcoplasmic reticulum and sarcolemma in the ventricle of catfish (Clarias gariepinus)

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Effect of changes in temperature on the force–frequency relationship in the heart of catfish (Clarias gariepinus)

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Cardiac Toxicity of Cadmium Involves Complex Interactions Among Multiple Ion Currents in Rainbow Trout (Oncorhynchus mykiss) Ventricular Myocytes

The findings indicate that the cardiotoxicity of Cd2+ in fish involves multiple ion currents that are directly and indirectly altered by Cd1+ through these mechanisms, which may trigger cardiac arrhythmias and impair myocardial contraction.
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Effects of seasonal acclimatization on thermal tolerance of inward currents in roach (Rutilus rutilus) cardiac myocytes

The response of INa to seasonal acclimatization conforms to the TDEE hypothesis, but the match is not quantitatively perfect, suggesting that other factors in addition to INa may be involved.
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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 produce…
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Stability and dynamic behaviour of steel structures with non-linear restraints

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