The confromational changes of polygonatum cyrtonema hua . lectin ii modified by reagents were studied by fluorescence spectrum and the fluorescence quenching study on pclii with cscu ki and acrylamide showed they all quenched the fluorescence of lectin through dynamic quenching mechanism . the antiviral activity of polygonatum cyrtonema hua 当受试细胞系为ht - 4时，黄精凝集素n对王a从1和fa琴2的半数抑制浓度均为ec50 = = o . 08u岁nil ;当受试细胞系为cem ，黄精凝集素n对班v
