586 



RADIATION BIOLOGY 



Mutants, somatic, 542 



St ropt oiny cin-resistant, 407 

 Mutations, 543 

 analysis of, 250 

 hioclicniical, 407 

 rhl(in)i)hvll, 2(U>-2C7 

 coincitionce of, 252, 258-259, 277 

 coI()r-r(\^ponsp, 410 

 coini)l('\ity of, 250 

 dominant! 258-259 

 cnil-|)()int, 405, 406 

 endosperm, 259 200, 203-264, 273- 



280 

 function of time after exposure, 257 

 gene, comparison of ultraviolet and 

 X-ray induced, 259-200, 202- 

 204, 266-208, 272 

 lethal, 253, 256, 268, 277, 280-281 

 dominant, 259 



recessi\-e, 252, 255-250, 259-200 

 sex-linked, 253, 255-257, 207- 

 268 

 and nucleic acids, 281 

 relation of, to chromosome aberra- 

 tions, 250, 255-268 

 to dose, 253, 274-278 

 to ultraviolet wave length, 250, 

 253, 260-201, 273-281 

 visible, 252, 255, 277 

 haplo-viable, 258, 260 

 in higher organisms, 249-281 

 induced, 405 



by photoreactivatiou, 476-479 

 in invertebrates, 309 

 lethal, 415, 416 



lethal-mutation hypothesis, 416 

 nature of, 250 



in protozoa, 289, 309, 310, 312-314 

 recessive lethal, 416-418 

 replication of, following ultraviolet 



radiation, 252, 255-256 

 reverse, 407 

 somatic, 544 



somatic-mutation theory, 542 

 spontaneous, 278-279, 402, 405 

 by ultraviolet, 83, 84 

 molds, new species, 85 

 sunlight, correlation, 84 

 zero-point, 405, 406 



N 



Nadsonia fulvescens, 433, 443 

 Necrosin, 518 

 Nematode eggs, 290, 292 

 Neurospora, 251, 277 



crassa, 432, 435, 437-439, 441-443 



Neutrons, 335 



effect on Euglena, 320 

 Nicoiiana (jlulinosa, 395 

 Ninhvdrin, 432 

 Nitrite, 432 

 Nitrogen, 375, 408 

 Nitrogen mustard, 432 



cfTect on protozoa, 311-313 

 Xonspecilic light lo.ss in microscopical 



prejiarations, 221, 222, 230-232 

 Nucleal reaction, 216, 217 

 Nucleases as cytochemical reagents, 213, 



215 

 Nucleic acid, 344, 516 

 Nuclein, 216 

 Nucleinic acid, 217 

 Nucleolus, ultraviolet ab.sorption, 221, 



234, 240 

 Nucleoproteins, 516-517 



ultraviolet absorption, 222-224 



O 



"One-hit" processes, 34 

 Ophiostoina niuUiannidntuni, 432 

 Optical density, 206 

 Optical dissociation, 3-4 

 Organic peroxides, 413, 414 

 Osteochondrosarcoma, 535 

 Oxygen, 407, 408, 416 



photochemical reactions of, 27-29 

 Oxygen concentration, 360, 408, 412 

 Oxygen tension affecting X-ray sensi- 

 tivity in fungi, 443, 447, 448 

 OxyhemoglolMu, specific absorption, 208 

 Ozone, absorption of, 105 



atmospheric, 100 

 Ozone formation by 1849 A, half life, 05 

 permissible concentration, 05 



P32, virus inactivation by, 343, 345 

 Pa})illonia virus, 335, 340 



intracellular irradiation, 358 

 Fandorina, 280, 287, 291, 293, 297, 320 

 Paramecin, 359 



Paramecium, 280-289, 291-297, 300, 

 302-304, 307-314, 310-318, 320- 

 322 

 mineral content, effect of X rays on, 



293 

 mutations producetl hy radioactive 

 isotopes, 312, 314 

 Paramecium aurelia, 395, 410 



kappa factor of, 359 

 Pathogenicity, 404 



