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31. Physical evidence concerning the rigidity of DNA molecules is conflicting. , decrease in net charge) coils up; a similar conclusion was also reached by Alexander and Hitch (1952). On the other hand, birefringence studies (Schwander and Cerf, 1951) and measurements of the rotary diffusion coefficient (Benoit, 1950, 1951) do not appear to be compatible with the view that a DNA molecule can coil up. If the molecule is rigid, then the decrease in viscosity may be due to reaction by the mustards with the groups which are responsible for forming the intermolecular bonds which leads to the network structure responsible for non-Newtonian behavior.

A protective effect), the action of the radiations is almost certainly indirect and the two substrates compete for a limited number of PETER ALEXANDER 44 radicals. Many effects of radiations are potentiated by the presence of oxygen, and this is often considered as evidence for indirect action, the oxygen bringing about the formation of the persistent radical HOs and hydrogen peroxide. The possibility that oxygen sensitizes the substrate and thereby increases the target area cannot, however, be neglected for some reactions,, such as the breaking of chromosomes.

OF CARCINOGENS WITH MACROMOLECULES THE REACTIONS 17 a several hundred-fold increase in viscosity. A coiled structure can also be obtained from the ionized form by adding electrolyte which reduces the repulsion between the charged groups. If PMA is treated with HN2, CH- r COOH I + NaOH -+ CHs- CH 2 x”’ --COO- Na AH* its viscosity in the ionized form is very greatly depressed (see Fig. 2). This decrease was shown to be due to internal crosslinking which prevents the coiled form from expanding on neutralization to its full length by the fact that the increase in viscosity on going from acid to salt form is much 0 b I I00 1 .

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