Effects of Low-temperature on Enzymes Activities of Nitrogen Metabollism and Free Amino Acids Contents in Root of Malus baccata Borkh. and Malus hupehensis Rehd. Seedlings Effects of Low-temperature on Enzymes Activities of Nitrogen Metabollism and Free Amino Acids Contents in Root of Malus baccata Borkh. and Malus hupehensis Rehd. Seedlings Damage Repair Effects of He-Ne Laser on Wheat Seedlings Exposed to Enhanced Ultraviolet-Birradiation Effect of Salt Stress on Ammonium Assimilation Enzymes of the Roots of Rice (Oryza sativa) Cultivars Differing in Salinity Resistance Isozymes Analyses of Cytoplasmic Male Sterile (CMS)Line in Pepper (Capsicum annuum L.) ACTIVITY OF VARIOUS KINDS OF ENZYME IN LARIX OLGENSIS AND ITS APPLICATION IN EARLY PROVENANCE SELECTON Changes of Glutamine Synthetase and Other Ammonia-Assimilating Enzymes during the Germination of the Seed and the Development of the Cotyledon in Cushaw EFFECT OF NaCl STRESS ON GLUTAMATE SYNTHASE AND GLUTAMATE DEHYDROGENASE OF RICE PLANTS Effect of Nitrate Nitrogen on Activities of Glutamine Synthetase and Glutamate Dehydrogenase during Development of Cucumber Cotyledon Enzyme activities responsible for nitrogen metabolization in different peanut cultivars Effect of NH4+-N/NO3--N ratios on the free amino acids and three kinds of enzymes of nitrogen metabolism in spinach(Spinacia Oleracea L.) shoot Cloning of Glutamate Dehydrogenase cDNA from Chlorella sorokiniana and Analysis of Transgenic Tobacco Plants