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Articles by M.A. Al-Omair
Total Records ( 2 ) for M.A. Al-Omair
  M.M. Azooz , M.M. Youssef and M.A. Al-Omair
  Soil contamination with heavy metals has become a worldwide problem, leading to a reduction of plant growth and productivity. The objective of this study was carried out to compare the effect of different levels of zinc (Zn2+) or lead (Pb2+)and their interactions on growth and physiological changes of Hassawi okra seedlings. These seedlings were grown in a soil, to which different levels (0, 5, 10, 20, 40, 80 mM) of Zn2+ or Pb2+ were added with water (control), singly or in combinations. The results revealed that, okra seedlings growth were reduced gradually with increasing Zn2+ or/and Pb2+. These parameters were completely inhibited at 80 mM of Zn2+ or Pb2+, when they added in combination. While, 5 mM Zn2+ had a favorable effect on these growth parameters. The contents of chl. a and chl. b were significantly reduced as a result of exposure to Zn2+ or/and Pb2+. However, carotenoids content was increased at lower levels as compared with control. The increased of Zn2+ or/and Pb2+ levels inhibited sugars accumulation while the contents of protein, total free amino acids and proline were promoted. Pb2+ had more toxic effect than Zn2+. The toxicity caused by each metal alone was lower than that caused when they were added in combinations. Our data suggested that Zn2+ and Pb2+ exhibited synergistic effects on the growth and physiological responses of Hassawi okra seedlings, leading to injurious effects followed by death of these seedlings at 80 mM. Combined exposure to Zn2+ and Pb2+ enhanced or inhibited some of the effects, that were induced when only one metal was applied to growth medium.
  B. Elmahdi , M.A. Al-Omair , A.A. El-Bessoumy and S.M. El-Bahr
  The stimulation of oxidative stress and lipid peroxidation by acrylamide has been extensively documented. However, the effect of acrylamide on glycolytic enzymes has not been completely elucidated. The present study investigated the effect of acrylamide exposure on activities of serum and hepatic glycolytic enzymes namely, pyruvate kinase, glyceraldhyde-3-phoshate dehydrogenase, phosphofructokinase, hexokinase and α-glucosidase in rabbits. In addition, the protective effect of garlic (Allium sativum) against acrylamide toxicity as reflected on glycolytic enzyme activities has been estimated. Rabbits were exposed to acrylamide dissolved at a concentration of 0.03% (w/v, corresponding to 4.2 mM acrylamide) in distilled water with or without diet containing 1.5% of garlic powder for 42 days. Acrylamide administration reduced the activities of all investigated glycolytic enzymes in serum and liver tissues of rabbits. However, administration of garlic powder with acrylamide significantly attenuated the reduction of activities of these enzymes. In conclusion, the present study emphasized the role of garlic as a potential adjuvant therapy to attenuate acrylamide toxicity in rabbits.
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