Research progress in hypoglycemic effect of natural dammarane saponins Studies on the Glycosides from American Ginseng Fruit Determination of Organochlorine Pesticide Multi-Residues in Astragalus membranaceus(Fisch.)Bge.var.mongholicus(Bge.) Hsiao,Panax notoginseng(Burk.) F. H. Chen and P.quin quefolium L.