224 



THE EFFECT OF IONIZING RADIATIONS 



the spectrum at 3600 A. X-ray irradiation reduced the absorption of 

 porphyrin at 4100 A (the Soret band), the effect being different at 



0.2 



2.5 



3.0 

 X 10-* A 



3.5 



Fig. 5. Effect of x-ray irradiation on the protein moiety of ferricytochrome c, dis- 

 solved in 0.005 ]\I HCl. Abscissa: Wavelength in angstrom units; ordinate: optical 



density E. 



different pH values. In acid sohitions, the Soret band almost dis- 

 appeared on irradiation with 100,000 r (Fig. 6). In alkahne sokitions 

 (Fig. 7) and in neutral sokitions (Fig. 8) the effect was not as marked 



