Studies on anti-tumor chemical constituents in exocarps of Juglans mandshurica Determination of molecular weight and content of Ginkgo biloba exocarp polysaccharides by HPLC HPLC fingerprint of flavonoids in Exocarpium Citri Grandis Comparison on UPLC and HPLC fingerprints of flavonoids in Citri Grandis Exocarpium Chemical constituents from exocarp of Juglans mandshurica Inhibition Effects of Flavonoids from Exocarpium citri Grandis on Nitrosation Exocarp Anatomy of Polygonum and Related Species from Shandong Province