ahmedabudief

Prof. Ahmed Mohamed Abu-Dief

Professor - Professor of Physical and Inorganic Chemistry

Faculty of science

Address: Behind hospital of Sohag University - Ali Ebn Abi Taleb Street

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Publications Which contain the keyword: Fish heart

Effects of seasonal acclimatization on thermal tolerance of inward currents in roach (Rutilus rutilus) cardiac myocytes.

2018-10-30 22:52:18 Keywords Cardiac excitability, Fish heart, Global warming, Heat tolerance, Ion channels, Thermal acclimatization,
Effects of seasonal acclimatization on thermal tolerance of inward currents in roach (Rutilus rutilus) cardiac myocytes.
ABSTRACT To test the hypothesis of temperature-dependent deterioration of electrical excitability (TDEE) (Vornanen, J Exp Biol 219:1941-1952, 2016), the role of sodium (I Na) and calcium (I Ca) currents in heat tolerance of cardiac excitability was examined in a eurythermic fish, the roach (Rutilus rutilus). Densities of cardiac I Ca and I Na and their acute heat tolerance were measured ... Read more

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

2018-10-13 23:42:59 Keywords Thermal acclimatization, Fish heart, Electrical excitability, Temperature tolerance, Climate warming,
Effects of seasonal acclimatization on action potentials and sarcolemmal K+ currents in roach (Rutilus rutilus) cardiac myocytes
Temperature sensitivity of electrical excitability is a potential limiting factor for high temperature tolerance of ectotherms. The present study examines whether heat resistance of electrical excitability of cardiac myocytes is modified by seasonal thermal acclimatization in roach (_Rutilus rutilus_), a eurythermal teleost species. To this end, temperature dependencies of ventricular action potentials (APs), and atrial and ventricular K+ currents were ... Read more

Effects of seasonal acclimatization on thermal tolerance of inward currents in roach (Rutilus rutilus) cardiac myocytes

2018-10-13 23:55:42 Keywords Heat tolerance, Thermal acclimatization, Fish heart, Cardiac excitability, Ion channels, Global warming,
Effects of seasonal acclimatization on thermal tolerance of inward currents in roach (Rutilus rutilus) cardiac myocytes
To test the hypothesis of temperature-dependent deterioration of electrical excitability (TDEE) (Vornanen, J Exp Biol 219:1941–1952, 2016), the role of sodium (_I_ Na) and calcium (_I_ Ca) currents in heat tolerance of cardiac excitability was examined in a eurythermic fish, the roach (_Rutilus rutilus_). Densities of cardiac _I_ Ca and _I_ Na and their acute heat tolerance were measured in ... Read more

Electrical excitability of roach (Rutilus rutilus) ventricular myocytes: effects of extracellular K+, temperature, and pacing frequency

2018-10-14 00:06:22 Keywords cardiac action potential, Fish heart, excitation threshold, exercise, catch-and-release fishing,
Electrical excitability of roach (Rutilus rutilus) ventricular myocytes: effects of extracellular K+, temperature, and pacing frequency
Exercise, capture, and handling stress in fish can elevate extracellular K+ concentration ([K+]o) with potential impact on heart function in a temperature- and frequency-dependent manner. To this end, the effects of [K+]o on the excitability of ventricular myocytes of winter-acclimatized roach (_Rutilus rutilus_) (4 ± 0.5°C) were examined at different test temperatures and varying pacing rates. Frequencies corresponding to in ... Read more

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