INDEX 



687 



purine and pyrimidine separation, 250- 



255 

 salt content, 250 



theoretical considerations, 248-249 

 water content, 249 

 Spectrophotometry, 



estimation of purines and pyrimidines 



and, 199-202 

 nucleic acids and, 5 

 Sperm, 



anisotropy of, 538 



human, deoxypentose nucleic acid ex- 

 traction, 330 

 nucleic acid and, 2 



nucleoprotamine isolation from, 316- 

 317 

 Spleen, 

 pentose nucleic acid of, 398 

 ribonuclease, properties of, 575 

 Spongosine, purine in, 98 

 Spongothymidine, 98, 159, 188 



source of, 87 

 Streptomycin, deoxj'pentose nucleic acid 



and, 337 

 Sucrose, deoxypentose nucleic acid and, 



529 

 Sugars, borate complexes, ion-exchange 



of, 235-236 

 Sulfanilic acid, reaction with thymine, 



304 

 Sulfonamides, 104 



Takadiastase, 



adenosine deaminase of, 596 

 nucleotidase activity of, 592 

 2,3,5,6- Tetraacetyl - d - galactof uranose, 



154 

 1,2,3,5-Tetraacetyl-D-ribofuranose, for- 

 mation of, 151 

 Tetraethylthiuram disulfide, xanthine 



oxidase and, 613 

 Tetrahydrofurfuryl alcohol, paper chro- 

 matography and, 253, 256-257 

 Tetrahydrouric acid, 119 

 2,4,5 , 6-Tetrahydroxypyrimidine, see 



Dialuric acid 

 Tetranucleotide, 



hypothetical, 474-475, 577 



nucleic acid structure and, 368-369 



Tetroses, 



cj'steine-sulfuric acid and, 295 



diphenylamine and, 288 

 Theobromine, 138 

 Theobromine nucleosides, synthesis of, 



149-150 

 Theophylline, 138 



deoxyribonucleoside of, 56-57 

 Theophylline glucoside, cyclic phosphate 



of, 175 

 Theophylline nucleoside, 



formation of, 143 



synthesis of, 149-150, 151 

 Thiamine, stability of, 92-93 

 2-Thioadenine, 105 

 2-Thiobarbituric acid, barbiturase and, 



623 

 5-Thiomethyl-D-ribose, occurrence of, 15 

 2-Thiothymine, uracil oxidase and, 622 

 Thiouracil, 



color tests for, 123 



derivatives, biological activity of, 103 



incorporation of, 135-136 



thymidine phosphorylase and, 605 



uracil oxidase and, 622 

 Thiouracil deoxyriboside, 605 

 Thiouracil riboside, 605 

 Thiourea, 



purine synthesis and, 133 



pyrimidine synthesis and, 125, 127, 128 



reaction with chloropurines, 130 

 Thymic acid, 342, 443 



composition of, 341 



formation of, 196 

 Thymidine, 139, 140 



cysteine reaction and, 292 



glycosidic linkage of, 144, 146-147 



phosphorolysis of, 58, 63, 604 



titration anomalies and, 523 



trityl derivative of, 146 



ultraviolet absorption of, 504, 509, 517 



uridine hydrolase and, 606 



uridine phosphorylase and, 606 

 Thymidine diphosphate, 172 



cysteine reaction and, 292-293 



deoxyribonucleic acid and, 440-441 



paper chromatography of, 255 



ultraviolet absorption of, 513 



production, mechanism of, 443-444 

 Thymidine-5'-phosphate, deoxyribo- 

 nucleic acid digests and, 441 



