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  • 1
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    Climate change record in subsurface temperatures: A global perspective (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-10-09
    Description: Analyses of underground temperature measurements from 358 boreholes in eastern North America, central Europe, southern Africa, and Australia indicate that, in the 20th century, the average surface temperature of Earth has increased by about 0.5 degreesC and that the 20th century has been the warmest of the past five centuries. The subsurface temperatures also indicate that Earth's mean surface temperature has increased by about 1.0 degreesC over the past five centuries. The geothermal data offer an independent confirmation of the unusual character of 20th-century climate that has emerged from recent multiproxy studies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pollack -- Huang -- Shen -- New York, N.Y. -- Science. 1998 Oct 9;282(5387):279-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉H. N. Pollack and S. Huang, Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA. P.-Y. Shen, Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9765150" 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)
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  • 2
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    Mantle discontinuity structure beneath the southern east pacific rise from P-to-S converted phases (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-06-05
    Description: Receiver functions derived from teleseismic body waves recorded by ocean-bottom seismometers on the southern East Pacific Rise reveal shear waves converted from compressional waves at the mantle discontinuities near 410- and 660-kilometer depth. The thickness of the mantle transition zone between the two discontinuities is normal relative to the global average and indicates that upwelling beneath the southern East Pacific Rise is not associated with an excess temperature in the mantle transition zone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shen -- Sheehan -- Dueker -- de Groot-Hedlin C -- Gilbert -- New York, N.Y. -- Science. 1998 May 22;280(5367):1232-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Y. Shen, Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. A. F. Sheehan, K. G. Dueker, H. Gilbert, Cooperative Institute for Research in Environmental Sciences (CIRES), University of.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9596570" 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)
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  • 3
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    Phase velocities of rayleigh waves in the MELT experiment on the east pacific rise (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-06-05
    Description: The phase velocities of Rayleigh waves increase more rapidly with distance from the East Pacific Rise (EPR) axis than is predicted by models of conductive cooling of the lithosphere. Low velocities near the axis are probably caused by partial melt at depths of 20 to 70 kilometers in a zone several hundred kilometers wide. The lowest velocities are offset to the west of the EPR. Wave propagation is anisotropic; the fast direction is approximately perpendicular to the ridge, parallel to the spreading direction. Anisotropy increases from a minimum near the axis to 3 percent or more on the flanks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Forsyth -- Webb -- Dorman -- Shen -- New York, N.Y. -- Science. 1998 May 22;280(5367):1235-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉D. W. Forsyth, Department of Geological Sciences, Brown University, Providence, RI 02912, USA. S. C. Webb and L. M. Dorman, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA. Y. Shen, Woods Hole Ocea.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9596571" 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)
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  • 4
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    A population genetic test of selection at the molecular level (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-12-01
    Description: The role of natural selection in molecular evolution has been inferred primarily by rejection of null hypotheses based on neutral theory, rather than by acceptance of specific predictions based on selection. In this report, a population genetic test of a specific prediction for selection on DNA polymorphism is presented. Pyrethroid insecticide use constitutes an experiment for which form of selection and molecular target (voltage-gated sodium channels) are both known. As predicted, differential pyrethroid selection on tobacco budworm populations generated significant geographic heterogeneity in sodium channel marker allele frequencies, compared with arbitrary loci.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Taylor, M F -- Shen, Y -- Kreitman, M E -- New York, N.Y. -- Science. 1995 Dec 1;270(5241):1497-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Entomology, Center for Insect Science, University of Arizona, Tucson 85721, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7491497" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Base Sequence ; *Evolution, Molecular ; *Genes, Insect ; Genetic Markers ; Insecticide Resistance ; Insecticides/pharmacology ; Male ; Molecular Sequence Data ; Moths/*genetics ; Polymorphism, Genetic ; Pyrethrins/pharmacology ; *Selection, Genetic ; Sodium Channels/*genetics ; 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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