Chromosome Structural changes in Tradescantia Microspores Produced by Absorbed Radiophosphorus

Dose Fractionation on Chromosome Aberration Frequencies I K Tradescantia Microspores. Neutrons

HE previous paper (DE SERRES and GILES 1953) has described the results T of experiments investigating the effects of fractionated doses of X-rays on the frequency of chromosome aberrations induced in Tradescantia microspores. The results of these studies demonstrate that there is a marked effect of X-ray dosage fractionation in reducing the yield of 2-hit aberration types and, further, that no ...

Postirradiative Effects on Chromosomal Aberrations in Tradescantia Microspores.

INCE 1939 when SAX employed the time-intensity factor to determine how S long a chromosome break would remain open and thus be available for interaction with other breaks, many different methods of influencing X-ray-induced chromosomal aberrations have been used in studying the rejoining capacity of broken chromosomes. SAX concluded that high-intensity radiation is more eff ective in producing ...

The Effect of Oxygen on the Production by Fast Neutrons of Chromosomal Aberrations in Tradescantia Microspores.

HE studies of THODAY and READ (1947) using root-tip cells of Vicia T j a b a demonstrated that oxygen has a marked effect in increasing the frequency of X-ray-induced chromosome aberrations. These investigators later showed (1949) that when alpha rays are used, the oxygen effect is much less, since the yield of aberrations with oxygen present was only slightly greater than in its absence. In ex...

Variations of Listeria Monocytogenes Produced by Beta Particles from Radiophosphorus

Chromosome Behavior and Nuclear Development in Tradescantia.

COMPARISON of microsporogenesis and microspore development A in a triploid Tradescantia has shown significant deviations from the normal diploid behavior. Occasional dicentric chromatids a t meiosis are found in diploid Tradescantias, but inversion crossovers in the triploid are much more frequent. An analysis of microspore development in a triploid Tradescantia shows that chromosome number has...