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  • Articles  (3)
  • Biological Evolution  (3)
  • American Association for the Advancement of Science (AAAS)  (3)
  • Cell Press
  • Wiley
  • Chemistry and Pharmacology  (3)
  • Mathematics
  • 1
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    Ascent of dinosaurs linked to an iridium anomaly at the Triassic-Jurassic boundary (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-05-23
    Description: Analysis of tetrapod footprints and skeletal material from more than 70 localities in eastern North America shows that large theropod dinosaurs appeared less than 10,000 years after the Triassic-Jurassic boundary and less than 30,000 years after the last Triassic taxa, synchronous with a terrestrial mass extinction. This extraordinary turnover is associated with an iridium anomaly (up to 285 parts per trillion, with an average maximum of 141 parts per trillion) and a fern spore spike, suggesting that a bolide impact was the cause. Eastern North American dinosaurian diversity reached a stable maximum less than 100,000 years after the boundary, marking the establishment of dinosaur-dominated communities that prevailed for the next 135 million years.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Olsen, P E -- Kent, D V -- Sues, H-D -- Koeberl, C -- Huber, H -- Montanari, A -- Rainforth, E C -- Fowell, S J -- Szajna, M J -- Hartline, B W -- New York, N.Y. -- Science. 2002 May 17;296(5571):1305-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12016313" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; *Dinosaurs ; *Ecosystem ; Ferns ; *Fossils ; Geologic Sediments/chemistry ; Iridium/*analysis ; Meteoroids ; Minor Planets ; North America ; Spores ; Time
    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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    Darwinian selection on a selfing locus (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-18
    Description: The shift to self-pollination is one of the most prevalent evolutionary transitions in flowering plants. In the selfing plant Arabidopsis thaliana, pseudogenes at the SCR and SRK self-incompatibility loci are believed to underlie the evolution of self-fertilization. Positive directional selection has driven the evolutionary fixation of pseudogene alleles of SCR, leading to substantially reduced nucleotide variation. Coalescent simulations indicate that this adaptive event may have occurred very recently and is possibly associated with the post-Pleistocene expansion of A. thaliana from glacial refugia. This suggests that ancillary morphological innovations associated with self-pollination can evolve rapidly after the inactivation of the self-incompatibility response.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shimizu, Kentaro K -- Cork, Jennifer M -- Caicedo, Ana L -- Mays, Charlotte A -- Moore, Richard C -- Olsen, Kenneth M -- Ruzsa, Stephanie -- Coop, Graham -- Bustamante, Carlos D -- Awadalla, Philip -- Purugganan, Michael D -- New York, N.Y. -- Science. 2004 Dec 17;306(5704):2081-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, North Carolina State University, Box 7614, Raleigh, NC 27695, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15604405" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Arabidopsis/*genetics/*physiology ; Biological Evolution ; Chromosome Mapping ; Climate ; DNA, Intergenic ; *Genes, Plant ; Genetic Variation ; Genome, Plant ; Geography ; Haplotypes ; Likelihood Functions ; Molecular Sequence Data ; Open Reading Frames ; Phylogeny ; Plant Proteins ; Pollen ; Polymorphism, Genetic ; Polymorphism, Single Nucleotide ; Protein Kinases/*genetics/physiology ; *Pseudogenes ; Recombination, Genetic ; *Selection, Genetic ; Time
    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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  • 3
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    Molecular phylogeny of the animal kingdom (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-02-12
    Description: A rapid sequencing method for ribosomal RNA was applied to the resolution of evolutionary relationships among Metazoa. Representatives of 22 classes in 10 animal phyla were used to infer phylogenetic relationships, based on evolutionary distances determined from pairwise comparisons of the 18S ribosomal RNA sequences. The classical Eumetazoa are divided into two groups. Cnidarians arose from a protist ancestry different from the second group, the Bilateria. Within the Bilateria, an early split gave rise to Platyhelminthes (flatworms) and the coelomate lineage. Coelomates are thus monophyletic, and they radiated rapidly into four groups: chordates, echinoderms, arthropods, and eucoelomate protostomes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Field, K G -- Olsen, G J -- Lane, D J -- Giovannoni, S J -- Ghiselin, M T -- Raff, E C -- Pace, N R -- Raff, R A -- GM34527/GM/NIGMS NIH HHS/ -- HD16739/HD/NICHD NIH HHS/ -- HD21337/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1988 Feb 12;239(4841 Pt 1):748-53.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Molecular and Cellular Biology, Indiana University, Bloomington 47405.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3277277" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; Humans ; Invertebrates/*genetics ; *Phylogeny ; RNA, Ribosomal/*genetics ; RNA, Ribosomal, 18S/*genetics ; Species Specificity
    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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