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Cytological observation and analysis of isoenzyme patterns in three types of hairy roots transfromed by Agrobacterium rhizogenes A4 SELECTION AND INSECT RESISTANCE OF TRANSGENIC HYBRID POPLAR 741 CARRYING TWO INSECT-RESISTANT GENES STUDY OF PROTOPLAST CULTURE IN ALFALFA CELL LINE TRANSFORMED BY AGROBACTERIUM TUMEFACIENS Selection and Identification of Resistant PLBs and Transgenic Plants Mediated by Agrobacterium tumefaciens with Antisense ACS Gene in Dendrobium spp. Genetic Transformation of Soybeans by Soaking Its Seeds with the Total DNA of American Ginseng (Panax quinquefolium) Ⅱ.Determination of Isoflavone Content by HPLC Establishment of Withania somnifera Hairy Root Cultures for the Production of Withanolide A Effects of forest conversion on quantities and spectroscopic characteristics of soil dissolved organic matter in subtropical China INFECTION OF TRANSFORMED Ri T DNA CARROT ROOTS BY GIGASPORA MARGARITA On Monophyly,Paraphyly and Polyphyly PROTOPLAST CULTURE AND CELL CULTURE FROM Ti T-DNA TRANSFORMED LINES OF HELIANTHUS ANNUUS L. Codl Tolerance of Transplastomic Tobacco Lines Carrying Insect Antifreeze Protein