Effects of high voltage electrostatic fields on protective enzyme activity in wheat plants and on the population dynamics of Sitobion avenae fabricius (hemiptera:aphididae) Effects of NO on NO Contents and Anti-oxidative Enzymes in Cotton Leaf at Growth Stage Effects of elevated CO2 and O3 concentration and combined on ROS metabolism and anti-oxidative enzymes activities of maize(Zea mays L.) Nickel-induced Oxidative Stress and Responses of the Antioxidant Enzymes in Roots of Triticum aestivum L. Seedlings Changes of four common plant populations growth and their anti-oxidative enzymatic system in desertification process Effect of Ultraviolet- B Irradiation on Lipid Peroxidation in Spinach Leaves