SUBJECT INDEX 



587 



mechanism for viruses and, 95-96 



reversal of, 96-99 

 Ultraviolet irradiation 



bacterial cells and, 431 



bacteriophage and, 191-192, 196-197, 

 210-211, 216, 227, 233-234 



coenzyme destruction and, 68 



deoxyribonucleic acid composition 

 and, 164 



frozen state and, 100 



gases, in various, 100 



humidity and, 80 



peroxide formation and, 102 



proteins and, 80-81 



purines and, 63-66 



pyrimidines and, 63-66 



sugars, effect on, 62-63 



temperature and, 80-81 



tobacco mosaic virus and, 269-271 

 Ultraviolet light, 40, 42, 46-48, see also 



far ultraviolet light 

 Uracil 



fluorouracil replacement by, 502 



incorporation inhibition and, 500, 503 



incorporation of, 329 



photoproducts of, 72 



reversible photolysis, 69-71 



ultraviolet absorption of, 52, 53 

 4-Uracil methyl sulfone, biological ac- 



ticity of, 517-518 

 Ureidosuccinase, 326 

 Urethane 



biological activity of, 519-520 



derivatives of, 520 



metabolism of, 520 



oncogenic action of, 520-521 

 Uric acid 



precursors of, 304 



ultraviolet irradiation and, 66 

 Uridine, reversible photolysis of, 70-71 

 Uridine diphosphate, reversible photol- 

 ysis, 71 

 Uridine diphosphate glucoside, 61 

 Uridine-5'-diphosphates, biosynthesis of 



331-332 

 Uridine kinase, 329-330, 504 

 Uridine phosphate 



photolysis and, 88 



ultraviolet spectra of, 53 

 Uridine-2'-phosphate, reversible pho- 

 tolysis, 69-70 



Uridine-3'phosphate, reversible pho- 

 tolysis, 69-71 

 Uridine-5'-phosphate, biosynthesis of 

 cell-free systems, 325-328, 330 

 precursors, small molecule, 323-325 

 pyrimidines, preformed and, 328-331 

 Uridine-5'-phosphate pyrophosphoryl- 



ase, 329-331, 504, 515 

 Uridine triphosphate, reversible pho- 

 tolysis, 71 

 Uride-5'-triphosphates, biosynthesis of, 



331-332 

 Uridylic acid 

 reversible photolysis, 69-71 

 ultraviolet irradiation and, 81-82 

 Uridylyl-5'-uridine, synthesis of, 110, 

 117-118 



Venom diesterase, 202 

 Viruses 



amino acid composition, 359 

 photochemical studies of, 60-61 

 photochemistry of, 93-96 

 quantum yields for inactivation, 94 

 ribonucleic acid and, 94-95 

 ultraviolet inactivation of, 93-96 

 ultraviolet irradiation and, 81-82 

 Viruses, animal 

 classification of, 293 

 composition of, 293 

 equine encephalomyelitis virus, 296 

 infectious principle of, 293 

 infectious ribonucleic acids of 



chemical agents and, 300-301 



hydroxylamine and, 300-301 



nitrous acid and, 301 



preparation of, 295-298 



size of, 298-300 

 Mengo encephalitis virus, 295-296 

 poliomyelitis virus, 296-297 

 ribonucleic acid of, 



arrangement and, 294-295 



base composition of, 250-251 



content of, 250 



preparation, 295-298 

 size of, 249-250 



West Nile encephalitis virus, 295-296 

 Viruses, plant, see also Tobacco mosaic 



virus 

 mechanism of infection, 286-288 



