Relationship between Yield and Photosynthesis of Leaf and Silique of Different Brassica napus L. Varieties during Reproduction Period The Effects of Nitrogen Deposition on Leaf Physiological and Photosynthetic Characters of Schima superba Seedlings from Three Provenances The Isolation and Identification of an Arctic Microalgae and Its Physiological and Biochemical Responses to Enhanced UV-B Radiation Effects of UV-B Radiation on Physiology of Cyclamen persicum Mill