... temperature-dependent effects. First, while differences in resting heart rate ( f H ) between groups were predictable based on previous research (range ∼28–65 beats min −1 ), with values for 1°C-acclimated fish slightly higher than those of acutely exposed conspecifics, the resting cardiac output ( ) of 1°C...

... to the heart's function when environmental conditions are variable. Consequently, exploring factors that trigger cardiac remodelling with acclimation to new environments represents a marvellous opportunity for performing mechanistic studies that minimize the genetic differences that accompany cross-species...

... damage to their hearts. In contrast, for mammals, the ischemia–reperfusion (IR) injury that leads to tissue damage during a heart attack is initiated by a burst of superoxide (O 2 · − ) production from the mitochondrial respiratory chain upon reperfusion of ischemic tissue. Whether turtles avoid...

...Georg Welzel; Stefan Schuster ABSTRACT High voltage electric shocks cause life threatening cardiac injuries such as sudden cardiac standstill or severe myocardial injury. Here, we analysed the physiology of the heart of the strongly electric catfish ( Malapterurus beninensis ) that stuns prey...

... accounting for body mass, heart ventricle mass was not related to variation in MMR or SMR, indicating that the quality of the heart (i.e. the capacity for mitochondrial metabolism) was more influential than heart size. Finally, the myocardial oxygen consumption required to offset the dissipation...

... Summary: The circulation of hemolymph in the antenna of Drosophila is powered by the rhythmic contraction of an auto-active somatic muscle which runs through the brain. Circulatory system Pulsatile organs Heart Pulsatility National Institutes of Health http://dx.doi.org/10.13039...

..., superoxide dismutase (SOD) activity and NAD + levels, and it prevented HFD-induced or cardiac Nmnat knockdown-induced cardiac lipid accumulation, malondialdehyde (MDA) content and fibrillation increase, and fractional shortening decrease. Cardiac Nmnat overexpression also activated heart Nmnat/NAD + /SIR2...

...Denis V. Abramochkin; Vladislav S. Kuzmin; Vladimir Matchkov; Andrey A. Kamensky; Tobias Wang ABSTRACT To provide the first description of the exact location of primary pacemaker of the squamate heart, we used sharp microelectrode impalements and optical mapping of isolated sinus venosus...

... provided that the original work is properly attributed. Summary: Additional mechanistic insights indicate why Atlantic salmon are more tolerant of high temperatures than Arctic char, and why char are particularly vulnerable to climate change. Thermal tolerance Heart Myocardium Red muscle...

... enhanced anoxia survival in adult but not hatchling turtles. To test this, adult and hatchling turtles were acclimated to either 20°C (warm) or 3°C (cold) for 5 weeks, and then the heart ventricles were collected for quantitative proteomic analysis. The relative abundance of 1316 identified proteins...

... and complex I activity. Fig. 1. Representative trace of the respiration protocol for isolated trout heart mitochondria. Malate (Mal, 2.5 mmol l −1 ) and pyruvate (Pyr, 5 mmol l −1 ) were added to stimulate complex I (CI)-dependent leak respiration (LEAK MP), followed by addition of adenosine...

... (5H fish), on in vivo and spontaneous heart rate ( f H ), electrocardiogram, ventricular action potential (AP) shape and duration (APD), the background inward rectifier ( I K1 ) and rapid delayed rectifier ( I Kr ) K + currents and ventricular gene expression of proteins involved in excitation...

... of the conduction system in the rat heart as determined by Leu-7 (HNK-1) immunohistochemistry and computer graphics reconstruction . Lab. Invest.   72 , 355 - 366 . Bezuijen , M. R. , Cox , J. H. , Thorbjarnarson , J. B. , Phothitay , C. , Hedemark , M. and Rasphone , A. ( 2013...

...Tatiana S. Filatova; Denis V. Abramochkin; Holly A. Shiels ABSTRACT Birds occupy a unique position in the evolution of cardiac design. Their hearts are capable of cardiac performance on par with, or exceeding that of mammals, and yet the structure of their cardiomyocytes resembles those of reptiles...

... with oxygen. The highly oxygen-dependent heart mitochondria thus might play a key role in shaping an organism's tolerance to temperature. The present study aimed to investigate the effects of acute and chronic warming on the respiratory capacity of European sea bass ( Dicentrarchus labrax L.) heart...

...Elizabeth F. Johnston; Ivan G. Cadonic; Paul M. Craig; Todd E. Gillis ABSTRACT Warm acclimation of rainbow trout can cause a decrease in the collagen content of the heart. This ability to remove cardiac collagen is particularly interesting considering that collagen deposition in the mammalian heart...

..., there is urgency to understand the compensatory abilities of key organs such as the heart to adjust under natural conditions. Thus, the aim of the present study was to directly compare the acclimatization and acclimatory response within a single eurythermal fish species, the European shorthorn sculpin...

... its redox active motif Cys-X-X-Sec. In mammals, SELENOT is expressed during ontogenesis and progressively decreases in adult tissues. In the heart, it is re-expressed after ischemia and induces cardioprotection against ischemia–reperfusion (IR) injury. SELENOT is present in teleost fish, including...

...Leah T. Sigle; Julián F. Hillyer ABSTRACT The primary pump of the circulatory system of insects is a dorsal vessel that traverses the length of the insect. The anterior portion, located in the head, neck and thorax, is the aorta, and the posterior portion, located in the abdomen, is the heart. Here...

... 2018 16 4 2018 © 2018. Published by The Company of Biologists Ltd 2018 http://www.biologists.com/user-licence-1-1/ Summary: The heart ventricles of squamate reptiles are without a specialized ventricular conduction system, and the manner of electrical activation can therefore...