29. DEOXYRIBONUCLEIC ACIDS AS MACROMOLECULES 



11 



sin 2 8/2 +78 x lO^c 

 Fig. 3. An example of a diagram according to Zimm's representation. 



Thus a diagram is obtained such as is given in Fig. 3. 



The two extrapolated external curves 1 and 2 have the same intercept 

 with the axis of ordinates which corresponds to the value of 1/M, and 

 initial slopes which respectively give the values of B and of R". 



(2) Large Values of hL. In this case which is realized for 6 — > -w and 

 L/X — > oo , P(G) or c/K can be replaced by its asymptotic expression. 



One obtains in the different cases: 



sphere 



rod 



disc 



Gaussian chain 



(23) 

 (24) 

 (25) 

 (26) 



