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  • 1
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    Questioning evidence of group selection in spiders (2015)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2015-08-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grinsted, Lena -- Bilde, Trine -- Gilbert, James D J -- England -- Nature. 2015 Aug 27;524(7566):E1-3. doi: 10.1038/nature14595.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Life Sciences, University of Sussex, John Maynard Smith Building, Brighton BN1 9QG, UK. ; Department of Bioscience, Aarhus University, Ny Munkegade 116, building 1540, 8000 Aarhus C, Denmark. ; School of Biological, Biomedical and Environmental Sciences, University of Hull, Cottingham Road, Hull HU6 7RX, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26310770" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptation, Physiological ; Aggression/*physiology ; Animals ; *Biological Evolution ; Female ; *Selection, Genetic ; Spiders/*physiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
    Electronic Resource
    Electronic Resource
    Solid-state 13C-NMR studies of the aging of poly(vinylidene fluoride)/poly(methyl methacrylate) blends (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 177-188 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Solid state 13C-NMR was used to investigate the miscibility and subsequent separation of solution-cast blends of poly(vinylidene fluoride) (PVF2) and poly(methyl methacrylate) (PMMA) with aging for a range of compositions. It was found that one amorphous phase and intimate mixing of the polymer chains in this phase existed for all compositions of the blends, even after 2 months of aging at room temperature as determined by the proton spin lattice relaxation time T1ρH in the rotating frame, and the time constant TCH for transfer of magnetization. The T1ρH is sensitive to the spatial homogeneity of the blend via spin diffusion and would indicate the presence of phases or domains in the amorphous component of the blend larger than approximately 19 Å. The TCH is proportional to the inverse sixth power of the interatomic distances needed for transfer of magnetization from proton to carbon and would be sensitive to a separation of polymer chains in the amorphous phase with aging on the order of 4-5 Å. There was an increase of the T1ρH and TCH values with aging, indicating that a subtle separation between unlike chains in the amorphous phase was occurring although a single amorphous phase was present.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1990.090280205
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