SYNTHESIS AND COMPARISON OF DIFFERENT ~(125)I-ESTRADIOL ANALOGE FOR ESTROGEN RADIO RECEPTOR ASSAY RADIOIMMUNOASSAY FOR ESTRADIOL IN SERUM THE BEHAVIOUR OF IODINE-125 IN SIMULATED PADDY SOIL A RADIORECEPTOR ASSAY OF LUTEINIZING HORMONE RELEASING HORMONE RECEPTOR AND CHARACTERIZATION OF LHRH BINDING TO PITUITARY RECEPTORS IN SHAO DUCK ABSORPTIONOF 125 I AND 3HINAQUATICPLANTS THE LEACHING AND MOVING OF 125 I IN SUBTROPICS SOILS OF SOUTH CHINA