18 



C. L. SADRON 



icr 5 - 5 M 



4 5 6 



cxl0 5 ,gm /ml 



(A) 



(B) 



■CxIO 5 , gm/ml 



(C) 

 Fig. 7. Viscosimetric behavior of solutions of DNA (A) compared with polyvinyl- 

 butylpyridinium bromide solution (B) and RNA solutions (C); T = 25°C, G = 0.25 

 sec. -1 . [From U. Z. Littauer and H. Eisenberg, Biochim. et Biophys. Ada 32, 320 



(1959).] 



static repulsions (or attractions) of the charges located on the different 

 sites of the flexible molecular filament act against the thermal agitation of 

 the elements of the chain and provoke an extension ( or contraction ) of the 

 coiled configurations. Such parameters as A, [rj], S, which depend on the 



