CONTENTS XUl 



C. Factors Controlling Induction 326 



D. Mechanism of Induction 330 



V. Properties of Lysogenic Bacteria 331 



A. Infection of Lysogenic Bacteria with Phages Homologous 

 or Closely Eelated to the Prophage : Immunity and Incom- 

 patibility 331 



B. Infection with Unrelated Phages 332 



C. Lysogenic Conversions 334 



VI. Characters of Temperate Phages 335 



A. Gereral Properties 335 



B. Action of Temperate Phages on Bacterial Metabolism .... 336 



C. Genetics of Temperate Phages 336 



D. Prophage Mutations: Defective Lysogenic Bacteria 337 



VII. Lyscgenization 339 



A. Phenotypic Aspects of Lysogenization 339 



B. Genetics of Lysogenization 340 



VIII. Genetic Determinism of Lysogeny 341 



A. Limited Number of Prophages per Cell 342 



B. Chromosomal Location of the Prophage 342 



C. Specific Locations of Different Prophages 344 



D. Nature of the Prophage 344 



IX. Temperate Phages as Genetic Vectors 345 



X. Lysogeny and Latency of Viruses 347 



References 349 



X. Radiobiology of Bacteriophage by Franklin W. Stahl 353 



I. Introduction 353 



A. Introductory Remarks 353 



B. Target Theory 355 



II. Ultraviolet Irradiation of T-Even Bacteriophage 357 



A. Irradiation of T4 357 



B. Comparative Radiobiology of T2 and T4 371 



C. Irradiation of Infected Cells 373 



III. The Inactivation of T-Even Phage by the Decay of Incorpor- 

 ated P32 (Suicide) 376 



A. Basic Procedures 376 



B. Cross and Multiplicity Reactivation 377 



C. Luria-Latarjet Experiments 378 



IV. X-Ray Inactivation of T-Even Phage 379 



A. Survival of Infectivity 379 



B. Multiplicity and Cross Reactivation 379 



C. Luria-Latarjet Experiments 380 



