Temporal changes of grassland vegetation, soil and soil microbial population in the Tianzhu alpine region Study on Land Use and Land Cover Change in Tianzhu County,Northeast End of Qinghai-Tibet Plateau Cloning of IGF-2 Gene cDNA in Tianzhu White Yak Study on active ingredient and mechanism in preventing vascular dementia of Tianzhusan coming from Tujia medicine Improving effect of Tujia Medicine Tianzhusan on learning and memory impairment caused by cerebral ischemia