Environmental regulations of C3 and C4 plants Requirements of FDA for preclinical toxicological studies on preparation of phytomedicine in US Research on foreign countries‘laws and regulations on surveillance and  reporting of postmarketing drugs adverse reactions A disturbed ecosystem Ⅱ. Nitrogen cycling and its regulation in tussah-feeding oak plantation Sapflow characteristics of Kandelia obovata and their controlling factors in Zhangjiang estuary, China. Preliminary study on general regulations for processing of different processing procedures of prepared slices of Chinese crude drugs in China