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  • 1
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    Antarctica and Supercontinent Evolution (2013)
    London : The Geological Society
    Details
    Keywords: Antarctica; Gondwana; supercontinent
    Description / Table of Contents: Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues / Simon L. Harley, Ian C. W. Fitzsimons and Yue Zhao / Geological Society, London, Special Publications, 383, 1-34, 9 October 2013, https://doi.org/10.1144/SP383.9 --- The Mesoproterozoic Rayner Province in the Lambert Glacier area: its age, origin, isotopic structure and implications for Australia–Antarctica correlations / E. V. Mikhalsky, J. W. Sheraton, I. V. Kudriavtsev, S. A. Sergeev, V. P. Kovach, I. A. Kamenev and A. A. Laiba / Geological Society, London, Special Publications, 383, 35-57, 20 May 2013, https://doi.org/10.1144/SP383.1 --- Pb isotopic domains from the Indian Ocean sector of Antarctica: implications for past Antarctica–India connections / M. J. Flowerdew, S. Tyrrell, S. D. Boger, I. C. W. Fitzsimons, S. L. Harley, E. V. Mikhalsky and A. P. M. Vaughan / Geological Society, London, Special Publications, 383, 59-72, 20 May 2013, https://doi.org/10.1144/SP383.3 --- Boron- and phosphate-rich rocks in the Larsemann Hills, Prydz Bay, East Antarctica: tectonic implications / Edward S. Grew, Christopher J. Carson, Andrew G. Christy and Steven D. Boger / Geological Society, London, Special Publications, 383, 73-94, 20 May 2013, https://doi.org/10.1144/SP383.8 --- The c. 1000–900 Ma and c. 550–500 Ma tectonothermal events in the Prince Charles Mountains–Prydz Bay region, East Antarctica, and their relations to supercontinent evolution / Xiaochun Liu, Yue Zhao and Jianmin Hu / Geological Society, London, Special Publications, 383, 95-112, 20 May 2013, https://doi.org/10.1144/SP383.6 --- Contrasting metamorphic records and their implications for tectonic process in the central Sør Rondane Mountains, eastern Dronning Maud Land, East Antarctica / Tatsuro Adachi, Tomokazu Hokada, Yasuhito Osanai, Nobuhiko Nakano, Sotaro Baba and Tsuyoshi Toyoshima / Geological Society, London, Special Publications, 383, 113-133, 13 May 2013, https://doi.org/10.1144/SP383.4 --- Possible armalcolite pseudomorph-bearing garnet–sillimanite gneiss from Skallevikshalsen, Lützow-Holm Complex, East Antarctica: Implications for ultrahigh-temperature metamorphism / Toshisuke Kawasaki, Tatsuro Adachi, Nobuhiko Nakano and Yasuhito Osanai / Geological Society, London, Special Publications, 383, 135-167, 20 May 2013, https://doi.org/10.1144/SP383.2 --- Anatectic reworking and differentiation of continental crust along the active margin of Gondwana: a zircon Hf–O perspective from West Antarctica / Chris Yakymchuk, Christine S. Siddoway, C. Mark Fanning, Rory Mcfadden, Fawna J. Korhonen and Michael Brown / Geological Society, London, Special Publications, 383, 169-210, 18 June 2013, https://doi.org/10.1144/SP383.7 --- Reconstruction of the early Mesozoic plate margin of Gondwana by U–Pb ages of detrital zircons from northern Victoria Land, Antarctica / Martin Elsner, Robert Schöner, Axel Gerdes and Reinhard Gaupp / Geological Society, London, Special Publications, 383, 211-232, 16 May 2013, https://doi.org/10.1144/SP383.5
    Pages: Online-Ressource (237 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781862396470
    URL: https://sp.lyellcollection.org/content/383/1
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and Evaluation of α-Methylidene-γ-butyrolactone bearing flavone and xanthone moieties (1997)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 80 (1997), S. 2337-2344 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In a search for inhibitors of platelet aggregation, a number of α-methylidene-γ-butyrolactones 5 and 6 bearing flavone or xanthone moieties, respectively, were synthesized and evaluated for their antiplatelet activity against thrombin(Thr)-, arachidonic-acid(AA)-, collagen(Col)-, and platelet-activating-factor(PAF)-induced aggregation in washed rabbit platelets. These compounds were synthesized from 7-hydroxyflavone (1) or 3-hydroxyxanthone (2) via O-alkylation (→ 3 and 4, resp.) and Reformatsky-type condensation (Scheme). Most of the flavone-containing α-methylidene-γ-butyrolactones 5a-d showed potent antiplatelet effects on AA- and Col-induced aggregation, while xanthone derivatives 6c-e were found to have the same pharmacological profile than aspirin in which only AA-induced aggregation was inhibited (Table 1). However, 6c-e were approximately three to ten times more potent than aspirin (Table 2). For the vasorelaxing effects, 5a was the only compound which exhibited significant inhibitory activity on the high-K+ medium, Ca2+-induced vasoconstriction (Table3). Both 5a and 6a, with an aliphatic Me substituent at C(γ) of the lactone, were active against norepinephrine-induced phasic and tonic constrictions while their γ-aryl-substituted counterparts 5b-f and 6b-f were inactive.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19970800806
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  • 3
    Electronic Resource
    Electronic Resource
    Melting behavior of poly(3-alkylthiophene)s with long alkyl side-chains (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 198 (1997), S. 1035-1049 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The melting behavior of two non-oriented poly(3-alkylthiophene)s (P3ATs) containing 12 and 14 carbon atoms, respectively, in the alkyl side chain was investigated by means of differential scanning calorimetry. We show that the two P3ATs display three melting endotherms after an isothermal annealing from the melt. Two of the melting peaks arise from the ordered structures which are completed in the course of the quenching of the sample from the melt, and judging from the essentially constant melting temperatures and heats of fusion, they are not influenced by the subsequent isothermal annealing conditions. On the other hand, a much slower crystallization induced by the annealing, which occurs over a wide range of temperatures, is responsible for the appearance of a third melting endotherm which is strongly dependent on the crystallization condition. We show that this secondary crystallization is not a perfection of the existing ordered structures, rather it results in distinct crystals which melt at a temperature Tm slightly above the crystallization temperature Tc. Moreover, it is shown that the plot of Tm versus Tc parallels the line of Tm = Tc, and that the difference Tm - Tc increases linearly as the number of carbon atoms in the side chain decreases. On the basis of the calorimetric and X-ray diffraction measurements, it is suggested that the secondary crystallization originates from the alkyl side chains.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1997.021980410
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  • 4
    Electronic Resource
    Electronic Resource
    A study of polymer blends by nonradiative energy transfer fluorescence spectroscopy (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 1955-1970 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The nonradiative energy transfer (NRET) method has been used to study the miscibility of polymer blends in the solid state. This can be done by labeling the polymers with fluorescence donor and acceptor chromophores. The efficiency of energy transfer, which reveals the interpenetration of the chains, is measured by following changes in the fluorescence intensity ratio of the donor and acceptor as a function of the concentration of the polymer mixture and by comparison with reference values corresponding to totally miscible and totally immiscible systems. It is shown that the reference ratio corresponding to the absence of energy transfer must be determined by using donor-labeled and acceptor-labeled polymer films, instead of making measurements in chromophore solutions in organic solvents, as has usually been done. It is also shown that fluorescence quenching is important in such studies, since it can lead to variations of the fluorescence intensity ratio by more than an order of magnitude; this factor varies with blend concentration and is particularly sensitive to the presence of halogen atoms. The NRET technique has been applied to several PVC/CPVC binary blends and to PCL/PVC/CPVC ternary blends in which PVC and CPVC were labeled by naphthalene and anthracene, respectively [PCL is poly(ε-caprolactone), PVC is poly(vinyl chloride), and CPVC is chlorinated PVC]. For binary blends, the measured intensity ratios indicate the immiscibility of PVC with CPVC, although there is nonnegligible energy transfer between the two phases. For ternary blends, the intensity ratios indicate that the addition of up to 40 wt % of PCL to the immiscible PVC/CPVC binary system leads to the formation of two coexisting PCL/PVC and PCL/CPVC phases.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1989.090271001
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  • 5
    Electronic Resource
    Electronic Resource
    Thermally induced relaxation and recovery of the macroscopic orientation in a side-chain liquid crystalline polyacrylate (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 3281-3288 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thermal relaxation behavior of a mechanically induced macroscopic orientation of the mesogenic groups in a side-chain liquid crystalline polyacrylate was investigated using timedependent polarized infrared spectroscopy. It was found that a complete relaxation occurred only at temperatures in the nematic to isotropic transition region, and that, more interestingly, the completely relaxed macroscopic orientation was recoverable by cooling the sample to its nematic state. This thermally induced relaxation and recovery of the macroscopic orientation was reversible upon repeated temperature changing cycles over an aging time of more than five hours. Moreover, the level of the orientation recovery was found to be sensitive to the recovery and relaxation temperatures and to the annealing duration at the relaxation temperature before cooling. A tentative interpretation is proposed for this orientation recovery.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021950924
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