584 



BACTERIOPHAGES 



Multiplicity reactivation {continued) 

 techniques in study of, 514-16 

 of X-ray-inactivated bacterio- 

 phages, 77, 362, 364 

 Mustard gas, effect on bacteria, 245. 

 246 

 effect on stability of bacteriophages, 

 52, 53 

 Mutagenic agents, 310-16, 318 

 Mutation (s), of bacteria, to colicin 

 resistance, 385, 386 

 to phage resistance, 125-27. 

 398, 490-501 

 in bacteriophages, 16, 24, 116, 129- 

 32,297-318,405-7,412,425 

 techniques for study, 501-1 1 

 definition, 441 



definition and criteria for, 290, 291 

 in temperate phages, 300, 369, 371, 

 411 

 Mutation hypothesis, of bacteriophage 



origin, 7, 8 

 Muton, definition, 355 

 Mutual exclusion, see Exclusion, 



mutual 

 Mycobacterium species, 121 

 Mycobacterium smegmatis phage, mor- 

 phology in electron micro- 

 scope, 36 



N 



Negative interference, 338, 343, 345. 

 351,352,355 



Neisseria, 121 



Niacin, as growth factor for bacterio- 

 phages, 278 



Nitrogen, labeled, in study of fate of 

 infecting bacteriophages, 208, 

 217-19, 224 

 in study of protein synthesis in 

 bacteriophages, 250 



Nitrogen mustard, effect on bacterio- 

 phages, 52, 53, 311 



effect on colicinogenic bacteria, 388 

 effect on lysogenic bacteria, 9, 312. 

 314, 373 

 Nitrous acid, effect on adsorption of 



bacteriophage, 152 

 Nocardia s'peciGS, 121 

 Nonionizing radiations, see Radia- 

 tions, nonionizing 

 Norleucine, as growth factor for 



bacteriophages, 275 

 DL-Norleucine, effect on adsorption 



of coliphage T4, 144 

 Nucleic acid(s), absorption spectrum. 

 67 

 in bacteriophages, 90, 91 

 in coliphage T2, 33 

 Nucleosidase, in coliphage WLL, 238 



O 



O antigens, resemblance to colicins, 

 385, 393 

 in Salmonella species, 123, 126, 399 



Oleic acid, effect on influenza virus, 

 51 



One-step growth, definition, 441 



One-step growth experiment, in study 

 of infective cycle of bacterio- 

 phages, 14, 15, 169-71,473-85 



Osmotic shock, effect on bacterio- 

 phages, 37, 38, 60, 61, 152, 

 162, 208, 209, 392 

 as taxonomic criterion, 428 



Oxalate, effect on adsorption of 

 bacteriophages, 235 



Oxidizing agents, effect on bacterio- 

 phages, 54 



Oxygen, effect on irradiation of 

 bacteriophages, 74 



Ozone, effect on bacteriophages, 54 



Pantothenate, as growth factor for 

 bacteria, 274 



