Simultaneous determination of seven constituents in Longsha Granules by dual-wavelength RP-HPLC Studies on chemical constituents in roots of Peucedanum praeruptorum Determination of tractylodinol in different populations of Atractylodes lancea Effect of endophytic fungal elicitors on growth and atractylodin accumulation of cell suspension cultures of Atractylodes lancea Determination of atractylodin, atractylon, and β-eudesmol and study on characteristic spectrum of Atractylodis Rhizoma