Studies on the choice of conditions for the extraction of hypericin from Hypericum perforatum Advances in studies on act ive constituents of Hypericum perforatum Chemical Constituents of Volatile Essential Oil in Hypericum perforatum Antibacterial Effect of the Total Extract of Hypericum perforatum L. on Corynebacterium glutamicum and Alcaligenes faecalis Quantitative determination of hyperforin in Hypericum perforatum by HPLC Effects of light, gibberellin and ethephon on germination of seed of Hypericum perforatum Synthesis and Accumulation of Hypericin in Hypericum perforatum L. Inhibition of Hypericum perf oratum extract on influenza A virus