IOI2 



SUBJECT INDEX 



Pleurodeles, 283, 371 



— embryo, 392 



— gastrula, 358 



— larvae, 449 

 Pleuronectes, 200 



— pi at ess a, 2 1 7 

 Pliohippus, 240 

 pluteus, 339 



PNA (pentose nucleic acid), 596, 612 



— , basophilic — granules of mature cells, 



614 

 Podarke, 602, 615 

 podophyllin components inhibiting 



anaphasic chromosome movement, 942 

 polar bodies, 328 

 polarity, of the animal body, 233 



— axis, 31 1 



— , pre-existing — of the oocyte, 318 

 polarization of the egg cell, 31 1 



— of the oocytes, and growth, 307 

 polyauxotrophs, aromatic, 65 

 polyblast, 688 



polycyclic hydrocarbons as complete and 

 independent carcinogenes, 858 



polyglutamyl folic acid derivatives cata- 

 lyzing conversion of serine to glycine, 121 



Polygonum, 768 



polymers, synthesis of high — , 150 



polynucleotide phosphorylase, 36, 103 



in microorganisms, 91 1 



reactions, 37 



polynucleotides, enzyme systems 

 catalyzing synthesis of — , 91 1 



— , synthesis, 37 



Polyodon, 225 



polypeptide chain formation on 

 ribonucleoprotein particulates of 

 microsomes, 45 



polypeptides, equilibrium concentrations, 

 150 



polyphenol oxidase, 786 



increasing tumor respiration, 893 



polyploidy, 157, 292 



polyploid nucleus, 771 



polysaccharides, of plant cell wall, 750 



— , pyrogenic, 619 



— , tumor necrotizing activity of 

 bacterial — , 881 



polytene giant chromosomes, 158 



Polytomella coeca, 274 



polyuronides of plant cell wall, 750 



Polyzoa, 589 



Porcellio scaber, 185 



Porifera, 590 



porphobilinogen, 90 



— synthesis by human erythrocyte 



enzymes, 90 

 porphyrin synthesis, 88 

 Portunus, 602, 606 

 post-castrational, adenomas and carcinoma 



of the adrenal cortex, 841 



— adrenal cortical adenoma, 826 

 postembryonic growth, 218 

 postgeneration, 593 

 postmitotic cells, 163 

 Potamobius torrentium, 185 

 potassium see also K 



potassium ions promoting cell enlargement 



in isolated plant tissues, 782 

 P-phase in regeneration, 595 

 PP-uridyltransferase, 39 

 PRA,85 



— as intermediate in GAR synthesis, 92 

 praseodymium as plant growth inhibitor, 



796 

 prebone condition, 534 



prechordal, differentiated — territory, 372 

 — , foreward migration of the — endo- 



mesoblast, 473 

 — , grafts of — neuroepithelium, 370 

 — , inductive ability of the — plate, 351 

 — , inductive action of the — mesoblast, 396 

 — , mesoblast, 407 

 — , pre-existing — plate, 384 

 — , pre-existing — primordium, 383 

 precursors, amino acids as — in PFS, 498 

 — , utilization of small molecular — in 



formation of proteins, 499 

 predispositions, 347 

 pre-existing skin, 671 

 preformism, biochemical, 349 

 pregastrula embryos, protein utilization 



in , 736 



pregastrular kinematics. 347 



pregastrulation, 319 



pregnancy, 49 



premuscle condition, 534 



prephenic acid, 67 



prepigment granules. 314 



prepituitary, 463 



preprophasic, inhibition by sulfanilamide, 



943 



— mitotic poisons, 929 



prevention of differentiation of embryonic 

 tissues by homologous adult tissue 

 extract, 733 



previtellogenesis, 310 



Prigogine's theorem, 154 



primary, follicle, 308 



— induction, 366 



— plant cell wall, 750 

 primitive streak, 463 



