Effect of Fields Radiation on Callus Inductivity and Differentiation of Hedysarum scoparium Fisch.et Mey. EFFECT OF ~(60)Co γ-RAYS IRRADIATION PRETREATMENT ON CALLUS INDUCTIVITY AND DIFFERENTIATION OF STRAWBERRY ANTHER EFFECTS OF ANTHER PRETREATMENT BY MAGNETIC FIELD ON ANTHER CULTURE OF Indica RICE Changes of alkaloids in Tibetan medicine Przewalskia tangutica during tissue culture and differentiation of its stem rapid propagation system Adjustment for regional ecological footprint based on input-output technique:a case study of Jiangsu Province in 2002