. The basic aspects of radiation effects on living systems. Radiation -- Physiological effect. 234 THE EFFECT OF IONIZING RADIATIONS In spite of oxidation of thiol groups and of tyrosine residues, electro- metric titrations have been of no aid, as no difference is observed be- tween the control and the irradiated solutions. Measurements of electro- phoretic mobilities were also of no help. Neither the areas nor the X 10 A Fig. 15. Effect of x-ray irradiation on the absorption spectrum of bovine serum albumen, dissolved in M fiuoroacetate buffer, pH Abscissa: Wavelength in angstr
. The basic aspects of radiation effects on living systems. Radiation -- Physiological effect. 234 THE EFFECT OF IONIZING RADIATIONS In spite of oxidation of thiol groups and of tyrosine residues, electro- metric titrations have been of no aid, as no difference is observed be- tween the control and the irradiated solutions. Measurements of electro- phoretic mobilities were also of no help. Neither the areas nor the X 10 A Fig. 15. Effect of x-ray irradiation on the absorption spectrum of bovine serum albumen, dissolved in M fiuoroacetate buffer, pH Abscissa: Wavelength in angstrom units; ordinate: molecular extinction coefficient X lO^E. mobilities of the protein solutions (serum albumin and globulin) were altered significantly. Measurement of the sedimentation rate, however, showed the presence of a second, faster-moving component when albumin and globulin were irradiated at pH 3. It is quite possible that this is a "dimerized" protein, the result of intermolecular union of two protein molecules through their —S—S— bonds to give Protein—S—S—Protein. 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 Symposium on Radiobiology (1950 : Oberlin College); Nickson, James J. New York, Wiley
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