INDEX 



G91 



assay of, 607 



properties of, 606-607 

 Uridine-5'-phenyl phosphonate, 176 

 ljridine-2'-phosphate, see also Uridylic 

 acid 



ultraviolet absorption of, 513 

 Uridine-2',3'-phosphate, ribonuclease 



and, 425 

 Uridine-3'-phosphate, 



esters, ribonuclease and, 565 



preparation of, 62 



ribonuclease and, 425, 562 



ultraviolet absorption of, 513 

 Uridine-5'-phosphate, 



coenzymes and, 187 



esters, ribonuclease and, 565 



structure of, 165 



sj'nthesis of, 174 



transphosphorylation of, 626 



ultraviolet absorption of, 513 

 Uridine phosphates, tumors and, 189 

 Uridine phosphorylase, bacterial, 



assay, 606 



equilibrium, 606 



specificity, 605-606 

 Uridine-5'-pyrophosphate, 



derivatives of, 99 



ion-exchange of, 232 

 Uridine triphosphate, 



isolation of, 189 



transphosphorylation and, 626 

 Uridylic acid, 169, 622, see also Uridine 

 phosphate 



analysis for, 395 



dissociation constants, 459 



esters, hydrolysis of, 417 



estimation of, 259 



hyrolysis of, 170 



ion-exchange of, 222-223, 224 



ionization of, 268-269 



isomers, 38 

 identification of, 170 

 ion-exchange of, 228 

 phosphate position in, 189 



liver pentose nucleic acid and, 397-398 



5'-nucleotidase and, 592 



paper chromatography of, 255-256 



pentose nucleic acid ratios, 407 



phosphotriesters and, 482 



ultraviolet absorption of, 512 



uracil formation and, 608 

 yeast pentose nucleic acid and, 402 

 Uridylyl-cytidine, synthesis, enzymatic, 



566 

 Uroxanic acid, formation from uric acid, 

 617 



Valine, 574 

 Vector, electric, 533 

 Vernine, 138, see also Guanosine 

 Vicine, 159 



isolation and occurrence of, 99 



structure of, 188 

 Virus, 81-82 



composition, 375 



deoxypentose nucleic acid extraction, 

 332 



isolation from plants, 376-379 



nucleic acid, analysis of, 206 



nucleoproteins of, 383, 530 

 Viscosity, 



deoxypentose nucleic acid and, 336, 

 338, 483-487, 489-490 



deoxyribonuclease and, 580 

 Vitamin B,2, 27 



ribose and, 13 



Xanthine, 2, 112 



cationic exchangers and, 218 



color test for, 124 



discovery of, 97-98 



dissociation constant, 457, 458 



fluorescence of, 247 



formation of, 85, 117, 131 



infrared absorption of, 547 



occurrence of free base, 94 



oxidation of, 121 



paper chromatography of, 251, 253 



reaction with triethylamine, 130 



reducing agents and, 120 



synthesis of, 132, 133, 134 



ultraviolet absorption of, 498-499, 501, 

 502, 552 

 Xanthine dehydrogenase, adenine and, 



595 

 Xanthine oxidase, 



assay of, 611-612 



carrier protein of, 613 



