692 



INDEX 



history, 609-611 

 inhibition of, 107, 612-613 

 iron and, 610 

 molybdenum and, 611 

 oxygen acceptors of, 610 

 specificity of, 612 

 Xanthopterin, 

 guanase and, 598-599 

 tautomerism of, 115 

 xanthine oxidase and, 612 

 Xanthosine, 36, 143, 157, 159 

 acid-base properties of, 477, 481 

 dissociation constant, 459 

 formation from guanosine, 142 

 hydrolysis of, 606 

 methylation of, 143 

 phosphorolysis of, 602, 603 

 synthesis of, 154 



ultraviolet absorption of, 506, 508, 

 512, 552 

 Xanthylic acid, hydrolysis of, 39, 167-168 

 X-Ray diffraction, 



deoxyribonuclease and, 541, 552, 624 

 dichroism and, 534 



nucleic acid structure and, 461-470 

 structure determination and, 

 nucleosides, 452-455 

 purines, 451-452 

 pyrimidines, 447-451 



Xylofuranose, 418 

 Xylofuranosides, synthesis of, 151 

 9-D-Xylopyranosyladenine, synthesis of 

 152-153 



9-D-Xylopyranosyl-2-methylthio-adenine, 



synthesis of, 152-153 

 Xylose, 12, 188 



nucleosides of, 98 



phosphates of, 42 



ribose-5-phosphate preparation and. 

 63 

 Xylose-5-phosphate, 42 

 metabolism of, 41 



Yeast, 



deoxyribonuclease, 584-585 

 deoxyribonucleate isolation from 324- 



325 

 pentose nucleic acid isolation from, 391 

 pentose nucleic acid, nucleotides of 

 402 



Zinc, 



deoxyribonuclease and, 581 



uricase and, 619 

 Zoonucleic acid, 3 

 Zymogen granules, nucleases and, 625 



