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  • Chemistry  (3)
  • *Extinction, Biological  (1)
  • 2010-2014  (1)
  • 1970-1974  (3)
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 156 (1972), S. 321-324 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 145 (1971), S. 163-168 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Vinylformate has been polymerized by free radicals in bulk, acetone, chloroform, and dimethylformamide at temperatures between +60 and -20°C. The differences (ΔHi≠ - ΔHs≠) of the activation enthalpies and (ΔSi≠ - ΔSs≠) of activation entropies were calculated from the temperature dependence of the ratio Xi/Xs of the mole fractions of isotactic and syndiotactic dyads, resp., formed in the different solvents. A compensation effect exists between (ΔHi≠ - ΔHs≠) and (ΔSi≠ - ΔSs≠) resp. The compensation temperature for the stereocontrol was determined as T0 = 344°K. This numerical value points towards a stereocontrol by hydrogen bonds during the transition state.
    Notes: Vinylformiat wurde in Substanz, Aceton, Chloroform bzw. Dimethylformamid bei Temperaturen zwischen +60 und -20°C radikalisch polymerisiert. Aus der Temperaturabhängigkeit des Verhältnisses Xi/Xs an isotaktischen und syndiotaktischen Diaden wurde die Differenz der Aktivierungsenthalpien (ΔHi≠ - ΔHs≠) bzw. -entropien (ΔSi≠ - ΔSs≠) für die Polymerisation in den einzelnen Lösungsmitteln berechnet. Zwischen (ΔHi≠ - ΔHs≠) und (ΔSi≠ - ΔSs≠) besteht ein Kompensationseffekt. Aus der Kompensationstemperatur T0 = 344°K der Stereokontrolle wird geschlossen, daß die Stereokontrolle mindestens teilweise durch Wasserstoffbrückenbindungen im übergangszustand bedingt ist.
    Additional Material: 1 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 12 (1974), S. 129-130 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2010-05-15
    Description: It is predicted that climate change will cause species extinctions and distributional shifts in coming decades, but data to validate these predictions are relatively scarce. Here, we compare recent and historical surveys for 48 Mexican lizard species at 200 sites. Since 1975, 12% of local populations have gone extinct. We verified physiological models of extinction risk with observed local extinctions and extended projections worldwide. Since 1975, we estimate that 4% of local populations have gone extinct worldwide, but by 2080 local extinctions are projected to reach 39% worldwide, and species extinctions may reach 20%. Global extinction projections were validated with local extinctions observed from 1975 to 2009 for regional biotas on four other continents, suggesting that lizards have already crossed a threshold for extinctions caused by climate change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sinervo, Barry -- Mendez-de-la-Cruz, Fausto -- Miles, Donald B -- Heulin, Benoit -- Bastiaans, Elizabeth -- Villagran-Santa Cruz, Maricela -- Lara-Resendiz, Rafael -- Martinez-Mendez, Norberto -- Calderon-Espinosa, Martha Lucia -- Meza-Lazaro, Rubi Nelsi -- Gadsden, Hector -- Avila, Luciano Javier -- Morando, Mariana -- De la Riva, Ignacio J -- Victoriano Sepulveda, Pedro -- Rocha, Carlos Frederico Duarte -- Ibarguengoytia, Nora -- Aguilar Puntriano, Cesar -- Massot, Manuel -- Lepetz, Virginie -- Oksanen, Tuula A -- Chapple, David G -- Bauer, Aaron M -- Branch, William R -- Clobert, Jean -- Sites, Jack W Jr -- New York, N.Y. -- Science. 2010 May 14;328(5980):894-9. doi: 10.1126/science.1184695.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95064, USA. lizardrps@gmail.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20466932" target="_blank"〉PubMed〈/a〉
    Keywords: Acclimatization ; Animals ; *Biodiversity ; Biological Evolution ; Body Temperature ; *Climate Change ; *Ecosystem ; *Extinction, Biological ; Female ; Forecasting ; Geography ; Global Warming ; *Lizards/genetics/physiology ; Male ; Mexico ; Models, Biological ; Phylogeny ; Population Dynamics ; Reproduction ; Seasons ; Selection, Genetic ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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