viii Contents 



PAGE 



The influence of oxygen on radiation effects 



by H. Laser ........ 106 



Discussion: AllPer, Gray, Laser, Latarjet, Stapleton . 116 



The influence of chemical pre- and post- treatments on 

 radiosensitivity of bacteria, and their significance for 

 higher organisms 



by A. HoLLAENDER and G. E. Stapleton . . .120 



Discussion: Alper, Van Bekkum, Gale, Gray, Haddow, 



HOLLAENDER, LaSER, LaTARJET, POPJAK, SpIEGELMAN, 



Stapleton, Stocken . . . . . . .135 



Postirradiation treatment of mice and rats 



by D. W. H. Barnes and J. F. Loutit . . . 140 



Discussion: Alexander, Van Bekkum, Butler, Haddow, 



HOLLAENDER, LaJTHA, LaTARJET, LOUTIT, SpIEGELMAN, 



Stapleton, Stocken . . . . . . .153 



Studies on the mechanism of protein synthesis 



by P. C. Zamecnik ....... 161 



Discussion: Bracket, Holmes, Pirie, Popjak, Spiegelman, 



Work, Zamecnik . . . . . . . .169 



Nucleic acids and amino acid incorporation 



by E. F. Gale 174 



Discussion: Bracket, Butler, Cokn, Gale, Pirie, Spiegel- 

 man .......... 183 



Protein synthesis in protoplasts 



by S. Spiegelman . . . . . . .185 



Discussion: Alexander, Bracket, Cokn, Davidson, Gale, 



Krebs, Lajtka, Spiegelman . . . . .193 



Influence of radiation on DNA metabolism 



by Alma Howard ....... 196 



Discussion: Alexander, Alper, Van Bekkum, Bracket, 

 Davidson, Gale, Gray, de Hevesy, Hollaender, Holmes, 

 Howard, Lajtka, Latarjet, Spiegelman, Swanson . 206 



