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^ 4fN4^2V^>y CONTENTS 



List of Contributors v 



Introduction xi 



Opening Address. By N. M. Sissaktan 1 



The Nature^ oftlie Initial Radiation Damage at tlie Sub-Celhilar Level. 

 By P. Alexander and Z. M. Bacv 3 



Mechanisms Involved in the Initiation of Radiobiological Damage in 

 Aerol)ic and Anaerobic Systems. By L. H. Gray 21 



Action of Radiation on Proteins and Nucleic Acids in Solution and at 

 Interx)hases. By A. G. Passynsky 45 



Electron S])in Resonance (ESR) Investigations on Radiation-Induced 

 Chemical Effects in Biological Species. By L. A. Blumenfeld and 

 A. E. Kalmanson 59 



The Action of X-Rays on Intracellular Bacterio])hage Formation. 

 Bv F. Hercik '. 09 



The Action of Ionizing Radiation on the Cellular Synthesis of Protein. 

 By Ernest Pollard 75 



Chemical Species Induced by X-Rays in Cells and their Role in Radia- 

 tion Injury. By E. L. Powers 91 



Fluorescence Studies of the Changes Undergone by Nuckoproteins and 

 their Derivatives in Irradiated Cells. By M. N. Meissel, E. M. 

 Brumberg, T. M. Kondratjeva and I. J. Barsky 107 



A Discussion of Some Immediate Effects of X-Irradiation on Living 

 Cells. By Barbara E. Holmes 131 



Radiation-Induced Disturbances of the Lipids of Cellular Micio- 

 structures. By N. N. Doemin and V. D. Blokhina 141 



The Significance of Free Deox;>T:ibonucleotides in Radiation Damage. 

 By J SosKA, L. Benes, V. Drasil, Z. Karpfel, E. Palecek and 

 M. Skalka 153 



Biochimie et Radiol)iologie du Noyau Cellulaire. By M. Errera 165 



On the Mechanism of Lethal Action of X-Rays in Escherichia coli K12. 

 By H. Marcovich 173 



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