Induction of Periploca sepium in vitro plantlet and studies on dynamic accumulation of periplocin Affect of Ag+ and La3+elicitors on growth and accumulation of adventitious roots of Periploca sepium Determination of periplocin concentration in mouse plasma by HPLC Accumulative changes of active components in different parts of Periploca sepium at various growth periods Accumulative changes of active components in different parts of Periploca sepium at various growth periods AntitumoreffecTof periplocin from Periplocae Cortex on H22 tumor bearing miceand its mechanism Correlation between elements accumulation and active components in velamen and stem bark of Periploca sepium