576 



SUBJECT INDEX 



nucleosides and, 319, 334, 377 

 phosphate incorporation and, 377 



Vitamin C, 

 nucleic acids and, 26-27 

 phosphate incorporation and, 378 



Vitamin E, nucleic acids and, 378 



Vitamins, 

 fat-soluble, nuclei and, 141 

 nuclear, choice of method, 119 



W 



Waring Blendor, isolation of nuclei and, 

 97-99, 104-105, 106, 109, 117 



Xanthine, 



catabolism of, 383, 423 



guanylic acid deamination and, 329 



incorporation of, 347 



interconversions of, 385 



nucleic acid synthesis and, 294 



transglycosidase and, 320 

 Xanthine deoxyriboside, nucleosidase 



and, 315 

 Xanthine oxidase, 241 



hypoxanthine and, 278 



nuclei and, 136, 142 



polynucleotide synthesis and, 383 



ribose-1-phosphate preparation and, 

 312-313 



substrates of, 423 

 Xanthophyll, nuclei and, 141 

 Xanthosine, 



nucleoside hydrolase and, 314 



utilization of, 386 

 Xanthylic acid, guanjdic deaminase and, 



323 

 X-rays, 



chromosomes and, 437 



mutations and, 442-443 



nucleic acids and, 39-40, 47, 414-416, 

 432-433 

 Xylem, Feulgen reaction and, 69 

 Xylitol, oxidation of, 274 

 Xyloketose-1 -phosphate, synthesis of, 



262 

 Xylonic acid, formation of, 268 

 Xylose, 



conversion to ribose, 270, 274 



conversion to xylulose, 270 



fermentation of, 265, 269-270 



oxidation of, 268 



pentose isomerase and, 267 



synthesis of, 264, 265 



utilization b}' mammals, 271 

 Xylose isomerase, equilibrium mixture, 



274 

 Xylose-5-phosphate, 270 



oxidation of, 268 

 Xj'lulose, 



excretion of, 272 



formation of, 266, 270, 274 



pentose isomerase and, 267 



Yeast, 



mitochondria of, 230 

 nucleic acids in, 41-42 



Zinc, 

 nuclei and, 141 



ultraviolet absorption and, 84 

 Zinc chloride-glycerin, light scattering 



and, 87-88 

 Zwischenferment, see Glucose-6-phos- 



phate dehydrogenase 

 Zymogen granules, nucleoli and, 151 



