1024 



SUBJECT INDEX 



UMP, 99 



undiflFerentiated protoplasm, 141 



unlimited growth (second growth type), 236 



Unna procedure, 360 



uracil, 11, 261 



uracil i^N, 907 



uracil, conversion of — to ^-alanine, 100 



— compounds, amination to cytosine, 100 

 uracil-2-''*C as DNA-T precursor in 



Ehrlich tumor cells, 104 

 uracil deoxyriboside, 288 

 — , utilization, 99 

 urea, 715 



— formation during development, 738 

 — , morphogenetic effect, 423 

 urease, 726 



— activity in black snake embryo, 740 

 — , evolutionary appearance, 741 



— , presence of — during incubation period 



of snapping turtle, 741 

 ,3-ureidopropionate, 118 

 ureidosuccinic acid, 41 

 , conversion to dihydroorotic acid by 



liver homogenates, 99 



i'*C as pyrimidine precursor, 907 



urethane as carcinogen, 863 

 - — as coleukemogen, 863 



— inducing pulmonary tumor, 857 

 uric acid, 13, 92 



— formation, 715 



— formation during development, 738 

 uridylic acid, activity of — from hepatoma, 



909 

 uridine nucleotides, glutamine as amino 



donor in conversion of to cytidine 



nucleotides by rat tumor enzymes, 123 



— phosphorylase, 10 1 



— phosphorylation, 102 

 uridyl transferase reactions, 38 

 urinary bladder tumors induced by 



carcinogenic amino compounds, 862 

 — , excess — nitrogen in regeneration, 609 

 urogenital cords, 467 

 uropygial gland, 461 

 Urodele ectoblast as reactor, 444 



— egg, 410 



Urodeles, 358, 378, 590, 604, 675 

 USA, 99 



usnic acid as metabolic poison, 286 

 UTP, 37, 99 



vacuoles of plant cell, 750 

 vacuolizing effect of Nile blue, 367 



vagocytic cells, migration of to the 



wound area, 665 

 valine, 68, 348 



valine, pantoate synthesis from — , 1 17 

 Van 't Hoff's rule, 216 

 vascular cambium, 767 



— penetration, 689 



— system and regeneration, 644 

 vegetal pole, 322 



vegetative pole, 31 1 



vegetalizing activity of micromeres, 339 



— effect of several amino acid analogs, 505 



— LiCl, 350 



ventral marginal zone of gastrula, 351 



versene as plant growth inhibitor, 796 



Viciafaba, 932 



Vinis vinera, 761 



viral agents of carcinogenesis, 839 



— induction of mouse leukemia, 853 

 virus, inhibition of — multiplication, 277 

 — , masked, 858 



— , ribonuclease interference with — 



multiplication, 284 

 viruses and cancer, 849 

 vitamin A, 10 



— as coenzyme, 52 1 



— , effect of — on tissue, 564 

 B-vitamins as precursors of 



metabolically active coenzymes, 555 

 vitamin Bjj promoting liver regeneration 



in rats, 631 

 vitamin B^, 53, 74 

 vitamin biosynthesis, 108 

 vitamin C, reduction of dehydroascorbic 



acid to — , 617 

 vitamin D, 1 10 

 vitamin K, antagonist, ig 



— as cell division promoting factor in 

 plants, 772 



vitamins in regeneration, 629 

 vitalism, 147 

 vitelline cells, 315 



— membrane, 718 

 vitellogenesis, 467 

 — , secondary, 313 

 vitelloid antigen, 720 

 Vogt's Bahnung, 347 

 Von Baer's law, 214, 324 



Walker tumor, 844 



Warburg's theory, 159 



warmth, extra-liminal, 416 



warts, involution of — , 230 



water content of human tumors, 915 



water metabolism in regeneration, 620 



way-back induction by epiderm, 460 



wear and tear, 589 



wearing out quota, 179 



weed killers, 763 



