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Triptolide in different populations and individuals of three species ofTripterygium Hook.f. Chemical constituents of seeds of Tuxus mairei(Ⅲ) Chemical constituents and their antiulcerogenic studies on whole herb of Conyza blinii (Ⅰ) Effects of climate and grazing on the vegetation cover change in Xilinguole League of Inner Mongolia, North China.