Beta-ray Induced Chromosome Breakage Phenomena in Plants

Sterility, chromosome breakage, x-ray induced mutation rates and detected mutation frequencies in Drosophila melanogaster.

AMONG the enduring problems of radiation genetics is the quantitative evaluation of mutational damage elicited in germ cells that have been exposed to a given dose of radiation. The significant question at issue is what proportion of all irradiated germ cells actually suffer an induced mutation, i.e., what is the mutation rate? This is the question that must be accurately answered before the co...

In Vitro Chromosome Breakage Induced by Arabinosyladenine in Human Leukocytes.

Chromosome breakage and repair.

FROM time to time one of my colleagues working at a medical school commiserates with me because I spend 40 hr a year lecturing to undergraduates. I always reply that teaching has compelled me to learn a lot of material that I would not have known about had I taught only my specialized subject. These forays into the ‘‘beyond’’ were instrumental in moving my research in new directions. Three arti...

Chromosome breakage and ultrasound.

Human lymphocyte cultures were examined for chromosome damage after exposure to ultrasound. Control and treated slides were scored "blind" and showed no evidence of damage due to ultrasound. Neither was there evidence of chromosome damage in blood cultures from six infants whose mothers had ultrasound during pregnancy when compared with that from six infants whose mothers had not. Our results s...

Experimentally Induced Chromosome Aberrations in Plants

The discovery of Lilly and Thoday, that the presence of potassium cyanide (KCN) increases the production of chromosome aberrations by x-rays in anoxia, but has no effect on the production of chromosome aberrations by x-rays in air, was confirmed. In the presence of cyanide, the effect of a given dose of x-rays in nitrogen was found to be even greater than the effect of the same dose of x-rays i...