Quantitative determination of hyperforin in Hypericum perforatum by HPLC Advances in studies on act ive constituents of Hypericum perforatum Studies on chemical constituents of Hypericum perforatum Studies on Tissue Culture and Plantlet Regeneration of Common St. John‘swort (Hypericum perforatum) Studies on the choice of conditions for the extraction of hypericin from Hypericum perforatum Effects of light, gibberellin and ethephon on germination of seed of Hypericum perforatum Inhibition of Hypericum perf oratum extract on influenza A virus Antibacterial Effect of the Total Extract of Hypericum perforatum L. on Corynebacterium glutamicum and Alcaligenes faecalis Study on correlation between nodule density of different organs and hypericin content in Hypericum perforatum Determination of flavonoids in Hypericum perforatum processed by different methods of drying by HPLC Synthesis and Accumulation of Hypericin in Hypericum perforatum L. Chemical Constituents of Volatile Essential Oil in Hypericum perforatum