586 



BACTERIOPHAGES 



Phosphorus {continued) 



in study of fate of infecting bac- 

 teriophages, 208-10, 212-14, 

 218-28 

 in study of inhibition of bacterio- 

 phage reproduction, 281 

 Photodynamic action, of dyes on bac- 

 teriophages, 64, 65 

 as taxonomic criterion for bacterio- 

 phages, 423, 427 

 Photoreactivation, definition, 441 

 of ultraviolet-inactivated bacterio- 

 phages, 70-73 

 as taxonomic criterion, 429 

 techniques in study of, 5 1 3, 5 1 4 

 of X-ray-inactivated bacterio- 

 phages, 76, 77 

 PIA, see Phage-inhibiting agent 

 Plaque (s), definition, 14 



mutations affecting, 303-5, 307, 

 316,369 

 techniques in study of, 505-8 

 size and morphology, 23-25 



as taxonomic criteria for bacterio- 

 phages, 423, 424 

 Plaque counts, in assay of animal vi- 

 ruses, 34 

 in assay of bacteriophage, 27-30, 

 32, 33 

 Plate, definition, 441 

 Poliomyelitis virus MEF-1. nucleic 



acids of, 89 

 Polyvalent phage, definition, 122 

 Potassium ion, efl^'ect on adsorption of 

 bacteriophage, 141 

 effect on heat inactivation of coli- 



phages, 58 

 effect on infected bacteria, 166 

 Precursor theory, 5, 6 

 Pressure, eff'ect on stability of coli- 



phages, 60 

 Productive infection, definition, 441 



Proflavine, effect on bacteriophage re- 

 production, 278-81, 306, 307, 

 316 

 in premature lysis of bacteriophage, 



174, 175 

 in preparation of doughnuts, 183- 

 86, 280 

 Proline, in coliphages, 90 



as growth factor for bacteria, 493 

 Propamidine, effect on bacteriophage 



reproduction, 285, 286 

 Properdin, in neutralization of coli- 

 phages, 102, 114 

 Prophage(s), 5, 6, 9, 11, 128, 366-68 

 composition, 367 

 conversion to vegetative phage, 373, 



374 

 criteria, 375 

 definition, 441 



effect on bacterial modification of 

 host range in bacteriophages, 

 293, 306, 379 

 genetic recombination with, 315, 



316, 375 

 in typing of bacteriophages, 419, 

 420 

 Protease, in coliphage T6, 239 

 Proteins, in coliphages, 88, 208-212, 

 216-18 

 effect on inactivation of bacterio- 

 phages, 75, 454 

 incorporation of analogues into, 284 

 synthesis by bacteriophage during 

 latent period, 19, 249-54, 263 

 Proteus species, colicins in, 382 

 Pseudoallelism, 351-57 

 Pseudolysogenesis, 9, 365 

 Pseudomonadaceae, 382 

 Pseudomonas phage, reproduction, 



inhibition, 279 

 Pseudomonas species, 1 2 1 

 lysogeny in, 366 



