2,4-二氯-7H-吡.咯并[2,3-d]嘧啶,2,4-Di

1953年沃森和克里克发现DNA双螺旋结构的论文

experimental results and ideas of Dr. M. H. F. Wilkins, Dr. R. E. Franklin and their co-workers at King's College, London. One of us (J. D. W.) has been aided by a fellowship from the National Foundation for Infantile Paralysis. J. D. WATSON F. H. C

Secondary structure of prion mRNA

(Figure 7); a tendency exists, however, to preserve or to restore all base-pairs. In particular the loop of HP C is highly conserved and has the sequence 5'-ACCHCA-3' with H being a pyrimidine, except in the capuchin and the marmoset sequences. HP C

Ames 试验（沙门氏菌回复突变试验）方法及导则

水 浴中保温。c) 在保温的顶层培养基中依次加入测试菌株菌液 0.1 mL，混 匀；加受试物 0.05 mL～ 0.2 mL（一般加入 0.1 mL。需活化时 另外再加入 10 % S9 反应混合液 0.5 mL），再混匀，然后迅速倾入底层培养基上。转动平皿，使顶层培养基均匀分布在底层上，平放固化，37 ℃ 培养 48 h 观察结果。d) 另做一阳性对照、溶剂对照和未处理对照。阳性对照不加 受试物，只加标准诱变剂（即试剂盒阳性对照试剂，见表 2）；溶剂对照加除受试物和标准诱变剂以外的所有试剂