对形态结构基本一致的 3株苏云金杆菌噬菌体的核酸性质及其限制性内切酶的酶切特性进行了比较研究。甲酰胺 -细胞色素 C法进行分子展层 ,发现其核酸均呈线状 ;核酸的热变性试验和 S1 酶的电泳结果表明 ,所有核酸均为双链 ;Hind 和 Bam H 酶对 3株噬菌体核酸均不敏感 ;而它们均能被 Eco R 切割成 8个片段 ,被 Hpa 切割成 7个片段。经电泳法测定 ,其分子量均为 48.0 8kb The nucleic acid properties of three Bacillus thuringiensis bacteriophages with basically the same morphological structure and the digestion characteristics of the restriction enzymes were compared. Formamide - cytochrome C method for molecular layer and found that the nucleic acid were linear; nucleic acid thermal denaturation test and S1 enzyme electrophoresis results show that all nucleic acids are double-stranded; Hind and Bam H enzyme 3 phage nucleic acid Are insensitive; and they can all be cut into eight segments by Eco R and cut into seven segments by Hpa. The electrophoretic method, the molecular weight of 48.0 8kb