THE ACTION OF IONIZING RADIATION ON ENZYMES AND VIRUSES 



3 Pollard, E. Advanc. Virus Res. 1954, 2 109. 



* Lea, D. E., Smith, K. M., Holmes, B. and Markham, R. Parasitology, 1944, 



36 110. 

 = Powell, W. F. and Pollard, E. Radiation Res., in press. 

 ^ Bonet-Maury, p. and Latarjet, R. This symposium. 

 ' Pollard, E. and Setlow, J. Arch. Bioch. Biophys. 1954, 50 376. 

 8 Woese, C. and Pollard, E. Arch. Bioch. Biophys. 1954, 50 354. 



DISCUSSION 



M. Errera : Je voudrais signaler que Jeener et al* a montre I'existence, dans 

 des feuilles de tabac injectees de virus de la mosaique, de deux antigenes de constantes 

 de sedimentation et de vitesses d'electrophese differentes, qui ont des proprietes 

 immunologiques proches de celles du virus et qui en font probablement partie. II 

 pourrait bien s'agir de proteines identiques a celles dont on peut supprimer les 

 proprietes immunologiques par irradiation des virus. 



L. Ehrenberg : Pollard determined by irradiation the same molecular weight 

 of saccharase when it was isolated and when it was situated in the intact yeast cells. 

 It should be noted that there are indications that the saccharase activity is located 

 on the surface of the yeast cell.f It would be important to know whether the yeast 

 cells were viable. 



* Jeener, R., Lemoine, P., Lavand'Homme, C. Bioch. Bioph. Acta, 1954, 14 321. 

 t Thorsell, W. and Myrback, K. Arkiv Kemi, 1951 , 3 323 ; cf. Wilkes, B. G. and Palmer, 

 E. T. J. Gen. Physiol. 1932, 16 233. 



74 



