A Preliminary Study to Evaluate the Antioxidative Capacity of Banana by Comparing the Diameter of Methyl Viologen Speckles Effects of Zn fertilization on antioxidative capacity and flavor quality of tomato fruit A Preliminary Study to Evaluate the Antioxidative Capacity of Banana by Comparing the Diameter of Methyl Viologen Speckles Study on optimizing extraction process of root of Polygonum multiflorum