Effective Chemical Constituents of Artemisia argyi Levl. et Vant for Inhibition of Platelet Aggregation Age Structure of Rhizomes of Artemisia argyi,a Clonal Plant Population in China’s Songnen Plain Isolation, screening and characterization of phytopathogen antagonistic endophytes from wild Artemisia argyi Preparation of emulsion-hydrogel transdermal patch of essential oil from Artemisiae Argyi Folium and its transdermal characteristics Chemical Studies on Essential Oils from Six Artemisia Species Influence of Enhanced UV-B on Physiological Characteristics of Eupatorium adenophorum L.and Artemisia argyi Levl