منابع مشابه
Increased Mutation Rate from Aged Datura Pollen.
are not comparable with measures of the fainter and more remote systems. The surprisingly small dispersion about the curve again emphasizes the general similarity in linear dimensions of the globular clusters of the galactic system. The plotted crosses refer to clusters whose computed distances involve only the earlier measures of diameter and integrated magnitudes; the distances for the others...
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Biological effects of ionizing radiations produced by an explosion of a nuclear device may be complicated by the heterogeneity and extreme intensity of the emissions. Changes in biological systems may be induced that are not attributable to blast, heat, or single-type radiation effects. Many data and discussions have resulted from laboratory studies of radiations, but until recently scant infor...
متن کاملIncreased mutation rate in sexual populations Mutation rate increases in sexual populations during range expansion
The evolution of higher dispersal during range expansion increases invasion speed, provided that a species can adapt sufficiently fast to novel local conditions. Iterated founder effects during range expansion, however, cause low levels of local genetic diversity at these range margins. Mutation rates can evolve, too, and using an individual-based model we show that natural selection may lead t...
متن کاملAntiproliferative withanolides from Datura wrightii.
A new withanolide, named withawrightolide (1), and four known withanolides (2-5) were isolated from the aerial parts of Datura wrightii. The structure of compound 1 was elucidated through 2D NMR and other spectroscopic techniques. In addition, the structure of withametelin L (2) was confirmed by X-ray crystallographic analysis. Using MTS viability assays, withanolides 1-5 showed antiproliferati...
متن کاملIncreased mutation rate in sexual populations The evolution of mutation rate in sexual populations during range expansion
The evolution of dispersal during range expansion increases invasion speed, provided that a species can adapt sufficiently fast to novel local conditions. Iterated founder effects during range expansion, however, cause low levels of local genetic diversity at these range margins. Mutation rates can evolve, too, under conditions that favor an increased rate of local adaptation, but this has thus...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1935
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.21.11.597