578 



BACTERIOPHAGES 



Deoxyribonucleic acid {continued) 

 by colicinogenic bacteria, 389 

 transfer from infecting phage to 

 progeny, 218-31, 249 



Depressor effect, in mixed infection of 

 bacteria, 322, 323, 500 



Detergents, effect on stability of 

 bacteriophages, 51, 52, 454 



2,7-Diaminoacridine, effect on bacte- 

 riophage reproduction, 279 



3,6-Diaminoacridine, effect on 



bacteriophage reproduction, 

 279 



2,6-Diaminopurine, effect on bacterio- 

 phage reproduction, 276 



Diffusion constants, of coliphages, 140 

 in determination of bacteriophage 

 size, 40, 43, 44 



Dihydrostreptomycin, effect on 



bacteriophage reproduction, 

 285 



Dilution end-point method, in assay 

 of bacteriophage, 30,31 



2,4-Dinitrophenol, effect on bacterio- 

 phages, 272, 273 

 in premature lysis of bacterio- 

 phages, 174 



DNA, see Deoxyribonucleic acid 



DNAase, see Deoxyribonuclease 



Dodecyl sodium sulfate, effect on 

 animal viruses and bacterio- 

 phages, 51, 52 



Dodecyltrimethylammonium chloride, 

 effect on coliphages, 51 



Doughnuts, definition, 439 



role in bacteriophage reproduction, 

 182-87, 252 



Dyes, effect on bacteriophage re- 

 production, 286 



Eastern equine encephalitis virus, 

 RNA of, 89 



Eclipse period, definition, 439 

 Efficiency of plating (EOP), in assay 

 of bacteriophage, 28-30, 451-53 

 of coliphage T2 on E. coli strains, 



28, 141, 142 

 definition, 439 

 on indicator bacteria, 494 

 Egg albumin, see Albumin, egg 

 Electron microscopy, in assay of 

 bacteriophage, 28, 29 

 in study of infected bacteria, 



202-5 

 in study of morphology and size of 

 bacteriophages, 35-41, 182-86 

 Electrophoresis, in study of bacterio- 

 phages, 44, 86 

 Enteric phages, growth factors, 235 

 host range, 431 

 neutralization, 110 

 taxonomic criteria, 424 

 Enteric phage PI, effect on bacterial 

 hosts, 201 

 genetic studies, 434 

 inactivation, 155 

 Enteric phage P2, effect on bacterial 

 hosts, 201 

 genetic studies, 434 

 lysogenization with, 128 

 mutants, 132 



phenotypic modification of host 

 range, 292, 406 

 Enterobacteriaceae, 121, 431 

 antigens of, 398 

 colicins in, 381, 382 

 phage typing of, 404, 416 

 EOP, see Efficiency of plating 

 Epidemiology, use of bacteriophages 



in, 395-420 

 Epoxides, effect on lysogenic bacteria, 



373 

 Erwinia carotovora phage, morphology 

 in electron microscope, 36 



