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TL;DR: A model, involving the existence of a linked lethal allele, is proposed, which accounts for significant temporal and maternal clonal differences observed in the rates at which single locus and multilocus gametes were incorporated in Norway spruce pollination.
Abstract: Rates and patterns of male gamete incorporation for a polycross mating design were studied for two independent years of pollination in Norway spruce, Picea abies (L) Karst. Segregation distortion in a subset of maternal clones was documented for one locus. We have proposed a model, involving the existence of a linked lethal allele, which accounts for these observations. Significant temporal and maternal clonal differences were observed in the rates at which single locus and multilocus gametes were incorporated. Striking differences in apparent fertility existed among four clones which produced unique multilocus gametes. One clone, in particular, was shown to be contributing three times as many gametes to the next generation as predicted by the hypothesis of equal clonal male contribution. These deviations from expectation were also detected in the genotypic distributions of the resultant filial generation. Ramifications of these results on family structures in the filial generation, effective size of the male population, and possible bias in inferences of genetic differences and parameter estimation are discussed.
33 citations
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31 Dec 1996
TL;DR: In this article, the role of iron in nucleation component dislocation loops has been investigated and the conditions of nucleation and growth of these component dislocations loops have been followed in a 1-MeV transmission electron microscope.
Abstract: Under irradiation, the acceleration of growth of nuclear reactor components made of Zircaloy is clearly correlated to the presence of component dislocation loops. In the early stages, these loops appear to be essentially located close to the intermetallic precipitates. At higher doses, when component dislocation loops are observed all over the microstructure, analysis of the Zr matrix reveals an homogeneous iron content due to the dissolution of the precipitates. Thus, iron may play a significant role in the nucleation component dislocation loops. A specific study has been performed on Zircaloy thin foils implanted with increasing amounts of iron. The conditions of nucleation and growth of these component dislocation loops have been followed in a 1-MeV transmission electron microscope. The dose level for component dislocation loop nucleation is weakly Fe-content dependent. However, their size and density increase with increasing iron implantation. These results are compared to direct observations made on irradiated reactor components. The role of iron on accelerated growth is then discussed.
33 citations
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TL;DR: In this article, the degradation of the UO 2 matrix thermal conductivity due to the dissolved fission products (after corrections for the precipitated fission-product phases) was analyzed by considering their effect on the phonon heat current.
33 citations
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TL;DR: In this paper, a 1-month-old, saturated rod of hardened Portland cement paste with w/c=0.40 was studied undergoing two freeze-thaw cycles over the range 227-297 K, using neutron diffraction, at slow rates of heating and cooling.
33 citations
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TL;DR: In this paper, the lifetime of a magnetic dipole band in each of the nuclei was obtained using the Doppler shift attenuation method, and the deduced B(M1) transition rates showed the characteristic behavior associated with the shears mechanism.
Abstract: Lifetimes of states of a magnetic dipole band in each of the nuclei {sup 106,108}Sn have been obtained using the Doppler shift attenuation method. The deduced B(M1) transition rates show the characteristic behavior associated with the shears mechanism. A simplified semiclassical analysis yields B(M1) values in qualitative agreement with those expected for previously assigned configurations. The results suggest extremely low deformations for these dipole structures. In particular, the {sup 106}Sn band appears to be the first example of almost pure magnetic rotation in a spherical nucleus. {copyright} {ital 1999} {ital The American Physical Society }
33 citations
Authors
Showing all 2298 results
Name | H-index | Papers | Citations |
---|---|---|---|
Michael D. Guiver | 78 | 288 | 20540 |
Robert J. Birgeneau | 78 | 587 | 22686 |
Mike D. Flannigan | 71 | 211 | 21327 |
Martin T. Dove | 61 | 396 | 14767 |
Luis Rodrigo | 58 | 341 | 12963 |
André Longtin | 56 | 260 | 16372 |
David Mitlin | 56 | 196 | 15479 |
John Katsaras | 55 | 220 | 9263 |
John E. Greedan | 55 | 391 | 12171 |
Gang Li | 48 | 406 | 7713 |
Matthew G. Tucker | 45 | 224 | 7288 |
Bruce D. Gaulin | 45 | 284 | 6698 |
Erick J. Dufourc | 43 | 144 | 5882 |
Norbert Kučerka | 43 | 119 | 7319 |
Stephen J. Skinner | 42 | 194 | 8522 |