James Dewey Watson
Maurice Hugh Frederick Wilkins
DNA碱基组成的定量分析 20世纪40年代chargaff规则
① DNA碱基组成有种的特异性,但没有组织、器官特异性。 ② A=T;G=C;A+G=T+C
Watson-Crick model of double-helical DNA. One polynucleotide chain is shown in blue and the other in red. The purine and pyrimidine bases are shown in lighter colors than the sugar-phosphate backbone. (A) Axial view. The structure repeats along the helical axis (vertical) at intervals of 3.4 nm which corresponds to 10 nucleotides on each chain. (B) Radial view, looking down the helix axis.
Paintings of DNA models on a 'Millennium Collection' stamp, designed by Mark Curtis (1999–2000), from the UK Royal
Mail&tion
Spirals Time — Time Spirals by Charles Jencks
(2000) at Cold Spring Harbor Laboratory
A-DNA: