TEMPERATURE EFFECTS ON X-RAY INDUCED CHROMOSOME ABERRATIONS

The Effect of Temperature on X-Ray Induced Chromosome Aberrations.

X-ray-induced chromosome aberrations in mouse dictyate oocytes. II. Fractionation and dose rate effects.

Slit-dose experiments were done on maturing dictyate oocytes to determine if the magnitude of the first dose influenced the "rejoining time" of radiation-induced chromosomal lesions. A total dose of 400r was split into various combinations with varying fractionation intervals. The data derived from analyzing interchanges indicate that there is no difference in the rejoining time whether the fir...

The Effect of Intensity of Infrared on X-Ray Induced Chromosome Aberrations in Tradescantia.

REVIOUS investigations have shown that infrared is effective in increasping the number of chromosomal aberrations induced by X-radiation ( KAUFMANN, HOLLAENDER and GAY 1946; SWANSON and HOLLAENDER 1946; YOST 1951). There has been little agreement at the interpretive level, however, on the mode of action of the infrared in producing this increase. Two hypotheses have been advanced. One proposes ...

X-Ray-Induced Chromosome Aberrations in the Corneal Epithelium of the Chinese Hamster.

When the corneal epithelium of the Chinese hamster is irradiated with ionizing radiation in vivo, a rectilinear relationship is observed between the yield of chromosome aberrations and the dose of x-rays within a dose range of 10 to 150 r. There is no threshold effect for chromosome breakage down to the 10-r level. The mean breakage rate of 0.00352 breaks per cell per roentgen is in very close ...

Haploid cells in rat kangaroo corneal endothelium cultures and x-ray-induced chromosome aberrations.

N the reproduction of mammals? germ cells undergo two maturation divisions I to yield haploid gametes which, through union with gametes from the opposite sex, give rise to the next generation. Based on the existence of haploid status in gametes, investigators in the 1940’s and 50’s experimentally induced haploid cells in parthenogenetically developed blastocysts or in very early embryos of rabb...