. Biophysical research methods. Biophysics -- Research. 472 JOHN W. G O W E N the number of genes not affected is equal to y, the original number of genes is N, the X-ray dose in r. units is d, and 6 is a constant, this equation becomes: y = Ne-"'^ The exposure of the blood cells of an organism to X rays is known to change the frequency of the leucocytes in the blood. These. tr UJ a. 50 :v 20 10 \ \ ^. DOSE 100 BACTERIA \ Ba ^ \ 200 400 X RAY DOSE, r. 600 Fig. 8. Effect of X radiation in lowering the resistance of different mouse strains to given doses of typhoid organisms. changes have p
. Biophysical research methods. Biophysics -- Research. 472 JOHN W. G O W E N the number of genes not affected is equal to y, the original number of genes is N, the X-ray dose in r. units is d, and 6 is a constant, this equation becomes: y = Ne-"'^ The exposure of the blood cells of an organism to X rays is known to change the frequency of the leucocytes in the blood. These. tr UJ a. 50 :v 20 10 \ \ ^. DOSE 100 BACTERIA \ Ba ^ \ 200 400 X RAY DOSE, r. 600 Fig. 8. Effect of X radiation in lowering the resistance of different mouse strains to given doses of typhoid organisms. changes have pronounced effects on the resistance of the organisms. Radiant energy has been used as a tool, for example, in altering re- sistance to mouse typhoid disease. Mice of resistant and susceptible strains have been irradiated and then inoculated with the disease organisms. A plot of the results is sho^vn in Figm^e 8. The data are quite irregular because of the difficulty of getting sufficient material for test. A general linear trend downward in resistance is evident wdth increased- irradiation. This would be expected if the X rays. 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 Uber, Fred Murray, 1905-. New York : Interscience Publishers
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