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The effects of 6-h hypothermic cardioplegic arrest on myocardial biochemical, morphologic, and functional recovery were investigated in two groups of dogs. Group 1 (n = 6) was subjected to hypothermia of 15 degrees C and group 2 (n = 6) was subjected hypothermia of 5 degrees C. Although the myocardial calcium (Ca) concentration was significantly higher at the end of reperfusion in group 2 compared to group 1, the MB-fraction of creatine kinase, mitochondrial aspartate aminotransferase, recovery of left ventricular systolic function, and mitochondrial morphologic integrity were better in group 2 than in group 1. These findings suggest that hypothermia of 5 degrees C in 6-h cardioplegia is not necessarily coupled with interference in myocardial contractility, despite the Ca overload that occurs during reperfusion. 相似文献
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Experimental and mathematical investigation of the fluid flow inside and below a 1/4 scale air model of a flash smelting burner 总被引:1,自引:0,他引:1
I. D. Šutalo F. R. A. Jorgensen N. B. Gray 《Metallurgical and Materials Transactions B》1998,29(5):993-1006
Single-phase turbulent fluid flow inside and below a burner model was studied to better understand the fluid flow processes
occurring inside and below flash smelting burners. The effect of Reynolds number and temperature on the axial velocity profiles
in a 1/4 scale experimental air model of a jet flow burner and shaft were investigated. Laser Doppler anemometry (LDA) was
used to determine the mean and fluctuating axial velocity components within and below this burner. Also experimentally determined
were the pressure profiles along the length of the burner and shaft and the inlet air and wall temperature profiles. In the
experiments, the Reynolds number range was approximately 60,600 to 76,100, which was in the turbulent flow regime. A mathematical
model was used to simulate axisymmetric two-dimensional air flow through a jet flow burner and shaft for Reynolds numbers
of 60,000 to 304,000. The axial velocity predictions of the high axial velocity region and surrounding region in the shaft
were in reasonable agreement with the axial velocity experimental results. Recommendations are made for the improvement of
the design of flash smelting burners. 相似文献