592 



BACTERIOPHAGES 



Urethane, effect on stability of coli- 

 phageTS, 50, 51 



V 



Vaccinia virus, inactivation by deter- 

 gents, 51 

 Valine, in coliphages, 90 



effect on bacterial reproduction, 



275 

 as growth factor for bacteriophages, 

 243, 275, 277 

 Vegetative phage. 5, 6, 19, 175 

 assay, 33 

 definition, 442 

 mating pool, 261, 262, 264, 333- 



35, 339-44, 349, 350 

 metabolic enzymes in, 240-42 

 metabolic requirements for repro- 

 duction, 247, 248 

 production in lysogenic bacteria, 9 

 Versene, see Ethylenediaminetetraacetate 

 Viable, definition, 442 

 Vi antigen, in typhoid strains, 123, 



124, 399, 409 

 Vibrio species, 121 

 lysogeny in, 366 

 Vibrio cholerae, bacteriophage of, 3 

 infection effect on, 1 96 

 susceptibility to bacteriophages, 1 24 

 Vibrio cholerae phages, taxonomic cri- 

 teria, 423 

 Virulence, of bacteriophages, method 

 of increasing, 448 

 as taxonomic criterion, 423 

 Virulent phage, definition, 442 



Virus theory, of bacteriophages, 5, 6 

 Viruses, animal, assay by plaque 

 counting, 34 

 inactivation by detergents, 51 

 insect, DNA of, 89 

 plant, RNA of, 89 

 Vitamin(s) B, analogues, effect on 

 bacteriophage reproduction, 

 276-78 



W 



Weight, of bacteriophages, 42, 46, 47 



X 



Xanthine, as growth factor for bac- 

 teriophages, 277 

 Xanthomonas pruni phage, serological 



mutants, 116 

 Xanthomonas s,ptc\t?., 121 

 X-rays, effect on bacteria, 177, 245, 

 246 

 effect on bacteriophages, 75-80, 



175,177,362,392,519 

 effect on colicinogenic bacteria, 



388, 392 

 effect on lysogenic bacteria, 9, 373, 



432 

 effect on reproduction of coliphage 

 T2, 18, 180 

 Xylose, in typing of 5. /i/)/;/ strains, 396 



Zinc ion, effect on adsorption of coli- 

 phage Tl, 148,269 



