Development of EST-SSRs markers and analysis of genetic diversities among different geographical populations of Manila clam Ruditapes philippinarum Genetic structure and variation in different geographical populations of Houttuynia cordata Sequence Analysis of mtDNA COⅠ Gene and Relationships of Geographical Populations of Oedaleus asiaticu in Inner Mongolia Study on preferred food of adult Mylabris phalerata in different geographical populations Drought Resistance of Different Stipa bungeana Populations in the Semi-arid Region of Loess Plateau