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Articles by A.S. Haffor
Total Records ( 2 ) for A.S. Haffor
  A.M. Al-Johany and A.S. Haffor
  The purpose of this study was to evaluate the effect of long-term cold exposure on the activity of Glutathione Peroxidase (GPX), Lactate Dehydrogenase (LDH) and Free Radicals (FR) production in spiny tailed lizard, Uromastyx aegyptius. Fifteen animals were randomly assigned to two groups. The experimental group underwent whole body cold exposure (8-10°C) for seven weeks period. In comparison with the control group FR production and LDH activity were increased significantly (p< 0.05) whereas GPX activity was decreased significantly (p< 0.05) under cold exposure. The regression of LDH on FR was significant (R2 = 0.67) indicting that FR affects LDH activity and there is a commonality exists between both variables. Based on the results of the present study it can be concluded that cold exposure induces acclimation in LDH activity. However the reductions of GPX reflect cold intolerance.
  A.S. Haffor and A. M. Al-Johany
  The purpose of this study was to examine the effects of heat stress, hypoxia and hypoxia-hyperoxia on Free Radicals (FR) production in mice. Three experimental groups were exposed to three environmental conditions namely; heat stress (35-38°C); hypoxia (12-15% O2) and the third group underwent hypoxia (12-15% O2) followed by hyperoxia (100% O2). In comparison with control group, mean FR production increased significantly (p<0.05) by 44.89% in the heat stress group, 26.13% in the hypoxia group and by 77% in the hypoxia-hyperoxia group. The partial correlation coefficient (r = 0.81), controlling for control group, for the FR induced by heat stress on FR caused by hypoxia was significant (p<0.05) with regression coefficient of R2 = 0.75 which was also significant (p<0.05). These findings indicated that FR production is related to environmental stress induced by heat stress, reductive stress (hypoxia) and oxidative stress (hyperoxia). Heat stress has common effects with hypoxia on FR production. The effect of hyperoxia is increased if tissue ischemia presents prior exposure to oxidative stress exposure.
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