A Simple Method for the Screening of Free Radical Scavenger Isolation and Identification of a Free Radical Scavenger from Cnestis ferruginca Physiological Protective Effect of Free Radical Scavenger on Papaya under Water Stress Protective Effect of Free Radical Scavengers and Drought Resistance in Sugarcane THE SUBSTANCES SCAVENGING OXYGEN FREE RADICALS IN MARINE ALGAE EFFECT OF THE SIMULATED ACID RAIN ON THE PROTECTING ENZYMES AND LIPID PEROXIDATION OF MEMBRANE IN COTTON COTYLEDON DISC Comparison study on Total Flavonoid Content and Anti-free Redical Activity of the Leaves of Bamboo,phyllostachys nigra, and Ginkgo bilabo