Rapid Propagation System and Germplasm Preservation in vitro of Phyllodoce caerulea Phenolic constituents from twigs of Acer rubrum and their anti-oxidation and anti-α-glucosidase activities Study on Plant Regeneration System of the Leafstalks and Germplasm Conservation in vitro of Ledum palustre Linn. var. dilatatum Wahlanberg In Vitro Rapid Propagation System and in Vitro Germplasm Peservation of Rhododendron schlippenbachii Maxim. In vivo intestinal absorption characteristics of phloridzin in rats Simultaneous determination of quercitrin, phloridzin and 3-hydroxyl phloridzin in leaves of Malus halliana by ultrasound-assisted ionic liquid-reversed phase liquid chromatography