. Ciba Foundation symposium on ionizing radiations and cell metabolism. Radiation -- Physiological effect; Cell metabolism; Radiation -- effects; Radioactivity. 62 J. A. V. Butler and liberation of inorganic phosphate; (5) occurs normally as a consequence of (4) (Scholes and Weiss, 1952; Butler and Conway, 1953). All these chemical effects are primarily radical reactions and can be produced by —OH radicals formed in other ways. The reactions of —H are not so well defined, except in so. o X a o NO IRRADIATION I X 10 £ IN SOLUTION 2xl0^r IN SOLUTION 8x lO^r IN SOLID |-2xl0^r SOLUTION 2 3 4 HOURS
. Ciba Foundation symposium on ionizing radiations and cell metabolism. Radiation -- Physiological effect; Cell metabolism; Radiation -- effects; Radioactivity. 62 J. A. V. Butler and liberation of inorganic phosphate; (5) occurs normally as a consequence of (4) (Scholes and Weiss, 1952; Butler and Conway, 1953). All these chemical effects are primarily radical reactions and can be produced by —OH radicals formed in other ways. The reactions of —H are not so well defined, except in so. o X a o NO IRRADIATION I X 10 £ IN SOLUTION 2xl0^r IN SOLUTION 8x lO^r IN SOLID |-2xl0^r SOLUTION 2 3 4 HOURS HYDROLYSIS —p- 6 Fig. 3. Hydrolysis of DNA by heating with sulphuric acid after irradiation (Butler and Simson, 1954). far as it combines with oxygen to form the oxidizing radical OgH. The liberation of inorganic phosphate varies with the square of the dose, as is to be expected since two phosphate ester bonds have to be broken in order to liberate PO4 (Butler and Conway, 1953). It is not easy to demonstrate directly the breakage of the nucleotide chains. The effect of single breakage is to liberate a terminal phosphate group, but it can be shown that after irradiation free phosphate is more quickly liberated on acid hydrolysis (Butler and Simson, 1954; see also Fig. 3).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ciba Foundation; Wolstenholme, G. E. W. (Gordon Ethelbert Ward); O'Connor, Cecilia M. (Cecilia Mary), 1927-. Boston, Little, Brown
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