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    Major ecological transitions in wild sunflowers facilitated by hybridization (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-08-09
    Description: Hybridization is frequent in many organismal groups, but its role in adaptation is poorly understood. In sunflowers, species found in the most extreme habitats are ancient hybrids, and new gene combinations generated by hybridization are speculated to have contributed to ecological divergence. This possibility was tested through phenotypic and genomic comparisons of ancient and synthetic hybrids. Most trait differences in ancient hybrids could be recreated by complementary gene action in synthetic hybrids and were favored by selection. The same combinations of parental chromosomal segments required to generate extreme phenotypes in synthetic hybrids also occurred in ancient hybrids. Thus, hybridization facilitated ecological divergence in sunflowers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rieseberg, Loren H -- Raymond, Olivier -- Rosenthal, David M -- Lai, Zhao -- Livingstone, Kevin -- Nakazato, Takuya -- Durphy, Jennifer L -- Schwarzbach, Andrea E -- Donovan, Lisa A -- Lexer, Christian -- R01 G59065/PHS HHS/ -- New York, N.Y. -- Science. 2003 Aug 29;301(5637):1211-6. Epub 2003 Aug 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Indiana University, Bloomington, IN 47405, USA. lriesebe@indiana.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12907807" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Physiological ; *Biological Evolution ; Chromosome Mapping ; Diploidy ; *Ecosystem ; Environment ; Genes, Plant ; Genome, Plant ; Genotype ; Helianthus/*genetics/physiology ; *Hybridization, Genetic ; Microsatellite Repeats ; Mutation ; Phenotype ; Quantitative Trait Loci ; Selection, Genetic ; Species Specificity ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Quantum optimally controlled transition landscapes (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-03-27
    Description: A large number of experimental studies and simulations show that it is surprisingly easy to find excellent quality control over broad classes of quantum systems. We now prove that for controllable quantum systems with no constraints placed on the controls, the only allowed extrema of the transition probability landscape correspond to perfect control or no control. Under these conditions, no suboptimal local extrema exist as traps that would impede the search for an optimal control. The identified landscape structure is universal for all controllable quantum systems of the same dimension when seeking to maximize the same transition probability, regardless of the detailed nature of the system Hamiltonian. The presence of weak control field noise or environmental decoherence is shown to preserve the general structure of the control landscape, but at lower resolution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rabitz, Herschel A -- Hsieh, Michael M -- Rosenthal, Carey M -- New York, N.Y. -- Science. 2004 Mar 26;303(5666):1998-2001.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Princeton University, Princeton, NJ 08544, USA. hrabitz@princeton.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15044798" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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    PAPER CURRENT
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