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Studies on Iridoidglucosides from Verbena officinalis Studies on chemical constituents of Verbena officinalis Photosynthetic characteristics of C4 desert species Haloxylon ammodendron and Calligonum mongolicum under different moisture conditions Effect of DCPTA on the Growth and Antioxidant Enzyme Systems of Maize Seedlings under Drought Stress Preparative separation of D(+)-β-(3,4-dihydrophenyl)-lactate sodium from Salvia miltiorrhiza by HPLC Embryogeniccallus induction and somatic embryo formationfrom hypocotyl explants of Lathyrus maritimus EVOLUTION TENDENCY OF PLAEOCLIMATIC ENVIRONMENT IN THE WEST LOESS PLATEAU SINCE THE LATE PLEISTOCENE