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  • Articles  (3)
  • Chemical Engineering  (2)
  • Equatorial Guinea  (1)
  • Genes, pol  (1)
  • Wiley-Blackwell  (2)
  • American Association for the Advancement of Science (AAAS)  (1)
  • Geological Society of America
  • 1
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    Island biogeography reveals the deep history of SIV (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-09-18
    Description: Simian immunodeficiency virus (SIV) lineages have been identified that are endemic to Bioko Island. The time the island formed offers a geological time scale calibration point for dating the most recent common ancestor of SIV. The Bioko viruses cover the whole range of SIV genetic diversity, and each Bioko SIV clade is most closely related to viruses circulating in hosts of the same genus on the African mainland rather than to SIVs of other Bioko species. Our phylogeographic approach establishes that SIV is ancient and at least 32,000 years old. Our conservative calibration point and analyses of gene sequence saturation and dating bias suggest it may be much older.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Worobey, Michael -- Telfer, Paul -- Souquiere, Sandrine -- Hunter, Meredith -- Coleman, Clint A -- Metzger, Michael J -- Reed, Patricia -- Makuwa, Maria -- Hearn, Gail -- Honarvar, Shaya -- Roques, Pierre -- Apetrei, Cristian -- Kazanji, Mirdad -- Marx, Preston A -- 1R01AI27698/AI/NIAID NIH HHS/ -- 1R01AI44596/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2010 Sep 17;329(5998):1487. doi: 10.1126/science.1193550.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Arizona, Tucson, AZ 85721, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20847261" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cercopithecidae/*virology ; Cercopithecus/virology ; Colobus/virology ; Equatorial Guinea ; Evolution, Molecular ; Genes, pol ; Genetic Variation ; Geography ; Mandrillus/virology ; Molecular Sequence Data ; Phylogeny ; Simian Acquired Immunodeficiency Syndrome/*virology ; Simian Immunodeficiency Virus/*classification/*genetics/isolation & purification ; Time Factors
    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
    Electronic Resource
    Electronic Resource
    Free radical formation in oriented polybutadiene during mechanical deformation below Tg (1974)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 14 (1974), S. 22-27 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The tensile behavior of oriented polybutadiene at 83°K is systematically studied as a function of strain rate and pre-test orientation. Electron spin resonance studies of radical formation are made in conjunction with the mechanical tests. Three different modes of mechanical behavior are observed (brittle, crazing and a second ductile behavior without crazing), depending on test conditions. Radical formation is observed in association with the two ductile modes of behavior. The ESR spectra obtained are attributed to a combination of allyl radicals formed by chain scission between the α-methylene groups and peroxy radicals. The relative quantity of the two radical species present is thought to be related to the ratio of cis/trans-isomerism. Stability of the radicals observed with time and with an increase in temperature is studied. Further studies are made of the quantity of environmental test gases absorbed during crazing.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760140105
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Impact damage in a composite materialPresented in part at the 8th Int. Conference Deformation, Yield and Fracture of Polymers, Cambridge, U.K. (1991). (1993)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 14 (1993), S. 286-291 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Damage development in plates of a glass fiber-reinforced polypropylene is recorded, using short pulse photography, during instrumented falling weight tests using the excess energy approach. It is seen that the damage is progressive throughout the test but its initiation cannot be detected either by freeze-frame photography or visual observation. Specimens are therefore subjected to low-energy impact followed by microscopic observation of the tensile face. It is found that the initial damage mechanism is cracking of the matrix at the fiber-matrix interface, the crack propagating along the fiber. The finite element method is used to estimate the stress distributions at damage initiation in 4-ply and 8-ply samples cut from unidirectional and cross-ply plaques. The computed results indicate that initial damage occurs when the transverse tensile stress reaches a critical value.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750140403
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    Paper (German National Licenses)
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