1248 



RADIATION BIOLOGY 



Mitosis, rate (frequency) of, 922 



correlated with type of radiation dam- 

 age to embryo, 902, 906, 908, 913 

 sensitivity of cell, 928 

 Mitosis-mitotic cycle, 627, 628, 642, 644, 

 655, 659, 677, 681, 682, 684, 685, 688, 

 691, 695, 696 

 Mitotic activity and radiosensitivity, 1 162 

 Mitotic effects, 766-798, 811-814 

 of alpha radiation, 785-787 

 of ionizing radiations, 766-798 

 acceleration of, 783, 784 

 calcium and, 796 

 cell structures involved, 784, 785 

 chromosome number and, 798 

 critical period, 768, 769 

 dosage rate and, 788-793 

 dose and, 769, 772, 782, 783 



for different species, 781, 782 

 duration of mitotic decrease and, 



775-777 

 on egg, 769 



fractionated treatment and, 793, 794 

 kind of radiation and, 785-788 



a rays, 786, 787 



|8 rays, 785, 787, 788 



y rays, 785-787 



neutrons, fast, 786, 787 



X rays, 786-788 

 kind of tissue and, 797, 798 

 length of mitotic cycle and, 775 

 mechanism of action, 785 

 normal mitotic rate and, 778-781 

 oxygen concentration and, 796 

 pH and, 796 

 recovery from, 770, 782 



in relation to dose, 782 

 retardation of, 768, 769, 771, 772, 



782, 783 

 reversion of, 768 

 sensitivity of different stages, 768, 



769, 771-774 

 on sperm, 769 

 temperature and, 794-796 



during treatment, 794 



following treatment, 794-796 

 type of preparation and, 797 

 urethane and, 796 

 methods of study of, 766-768 



counting of mitotic stages, 767, 768 

 timing of cells, 766, 767 

 of ultraviolet radiations, 811-814 

 acceleration of, 811, 812 

 chemical treatment and, 813, 814 

 intensity and, 813 

 regression of, 813 

 retardation of, 811 

 sensitivity of different stages, 812, 813 



Mitotic effects, of ultraviolet radiations, 



wave length and, 811, 812 

 Mitotic mechanism, injury of, and radia- 

 tion damage to embryo, 902-904 

 Mitotic spindle (see Spindle) 

 Modification of radiation effects (see 



Radiation injury) 

 Modifying factors, effects of, on radia- 

 tion-induced chromosome aberra- 

 tions, 736ff. 

 Molds, 391, 399, 417, 444, 461 

 Molecular chaos, 392 

 Molecular rays, 3 

 Mongolism following prenatal irradiation, 



909 

 Monkey, LD 60 for, 930 

 Monochromatic radiation, 16 

 Monocytes, effect of radiation on, 1033 



morphological changes in, 1063 

 Monosomies, 644 



Monsters (see Morphological changes fol- 

 lowing irradiation) 

 Morphine, 937 



Morphological changes following irradia- 

 tion, compared with effects of other 

 agents applied to embryos, 907-908, 

 913 

 during fetal period, 863, 895-898 

 of human embryos, 908-911, 913 

 intermediate effects of maternal body 



on, 901, 911, 912 

 nature of primary damage leading to, 



902-904, 906, 913 

 during period of major organogenesis, 

 862, 868-869, 878-893, 909-910, 

 912-913 

 during preimplantation period, 862, 



864, 866-867, 886 

 (See also names of specific abnor- 

 malities) 

 Mortality, dose curves, 932 

 neonatal, and irradiation, during fetal 

 period, 893-894 

 during period of major organo- 

 genesis, 869, 874-875, 890, 904- 

 905, 912 

 during preimplantation period, 

 875 

 postnatal, and irradiation, during fetal 

 period, 893-895 

 of human embryo or fetus, 911 

 during period of major organo- 

 genesis, 869, 904 

 prenatal, influence of radiation effects 

 on mother, 900-901 

 and irradiation, during fetal period, 

 862, 893-894 



