Comparative studies on content of arbutin, bergenin and catechin in different part of Bergenia purpurascens and B. crassifolia Comparison of arbutin contents from Bergenia purpurascens in Yunnan Studies on biotransformation of arbutin by 4-hydroxy phenol in hairy root of Polygonum multiflorum Expermental Study and Textual Reseatchon Whether the Genus of Pyrola Contains Arbutin Studies on the Arbutin Biosynthesis by Hairy Root of Panax ginseng C.A Mayer Biotransformation of 4-Hydroxybenzen Derivatives by Hairy Root Cultures of Polygonum multiflorum Thunb. Studies on chemical constituents from roots of Pterospermum heterophyllum Studies on chemical constituents from roots of Pterospermum heterophyllum Determination of Arbutin in the Herbs of Vaccinium vitis idaea L.by RP HPLC Cloning and Bioinformatics Analysis of VdAS1 Gene in Vaccinium dunalianum (Ericaceae) Biosynthesis of arbutin from crown gall of transgenic Panax quinquefolium