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Purification technology for flavone from Alpiniae Oxyphyllae Fructus with macroporous resins Tissue culture system of Cynanchum otophylum in genetic transformation MATHEMATICAL MODELS FOR ECONOMICAL GENETICS IN POPLAR——TECHNIQUE OF OPTIMUM SELECTION FOR MULTIPLE OBJECTIVES A STUDY ON OPTIMUM FITTING ONE-WAY VOLUME EQUATION BY MODIFIED SIMPLEX METHOD Rational range and optimum proportion of energy input in farmland Effect of N, P and K fertilizer application and optimum rate for yield of millet Meta-Analysis of Evolution Trend from 1950s to 2000s in the Relationship between Crop Yield and Plant Density in Maize The Study of Synthetical Judgement in Many Sides on the Mixed Model of Masson-Pine-Mixed Fores Principles and Ecologically Optimal Model for Desert Grassland Management Effects of Suboptimum Temperature and Suboptimum PFD in a Short Time on Enzymes Activities and Genes Expression Related to Nitrogen Absorption of the Cucumber Plants Extraction and enzymatic properties of β-glucosidase in leaves of Baphicacanthus cusia