GENERAL DISCUSSION 367 



successfuly clcnelopoil by Tarusov. It i.s (j^uite clear that the formation 

 of the peroxides under irradiation conditions must be in direct depen- 

 dence upon the concentration of free oxygen in the medium. 



In fact it was discovered that after irradiating mice for 10 sec with 

 a lethal dose of X-rays (13 kr) a certain increase in the amount of 

 peroxide-lilte compounds in comjjarison with the control takes place 

 directly after irradiation. It is important to note that the various 

 protective substances, even including aminothiols, sharply reduce the 

 output of the organic peroxides both in irradiated and in healthy 

 animals. 



It was also shown by these experiments that the oxygen effect is 

 of tremendous significance for an understanding of the action of the 

 protective substances belonging to the various classes of chemical 

 com23ounds, including the aminothiols. 



In the concluding speeches, Z. M. Bacq (Belgium), A. Hollaender (U.S.A.) and 

 G. M. Franlv (U.S.S.R.) referred to the successful organization and fruitful work 

 of the symposium, and expressed their gratitude to its participants and organi- 

 zers. 



