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  • 1
    Electronic Resource
    Electronic Resource
    Esterification of chrysotile-asbestos by allyl alcohol (1975)
    s.l. : American Chemical Society
    Inorganic chemistry 14 (1975), S. 2853-2854 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50153a053
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The single group-I intron in the chloroplast rrnL gene of Chlamydomonas humicola encodes a site-specific DNA endonuclease (I-ChuI)
    Amsterdam : Elsevier
    Gene 129 (1993), S. 69-76 
    Details
    ISSN: 0378-1119
    Keywords: Chloroplast DNA ; LAGLI-DADG amino-acid motif ; in vitro translation ; intron mobility ; intron-encoded protein ; large subunit rRNA-encoding gene
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-1119(93)90697-2
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  • 3
    Electronic Resource
    Electronic Resource
    Étude du comportement viscoélastique du polycarbonate de bisphénol-A partiellement cristallisé (1969)
    Springer
    Rheologica acta 8 (1969), S. 504-510 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Summary This paper describes a procedure to obtain polycarbonate of bisphenol A samples of various degrees of crystallinity. The modulus-temperature curves and the impact strength of these materials are investigated. The results show the importance of the annealing procedure on the mechanical properties of these systems.
    Notes: Résumé On étudie dans cet article un procédé pour obtenir des polycarbonates de bisphénol-A de divers taux de cristallinité. On détermine la variation thermique du module-(10 sec) et la résistance au choc des ces polymères. On étudie également l'influence du recuit sur les propriétés mécaniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01976236
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  • 4
    Electronic Resource
    Electronic Resource
    High energy electrons detected during solar flares (1972)
    Springer
    Solar physics 23 (1972), S. 487-500 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The S 79 experiment on board of the HEOS-A1 European Satellite has been designed to electrons detection whose kinetic energies should be equal or greater than 7.5 MeV. From December 1968 to July 1970, 11 events were observed. Their main characteristics are described in this article. Two different categories of events may be sorted out from these observations. The propagation conditions in the interplanetary space are now discussed to find out a possible interpretation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148110
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of solar corona conditions on flare particle propagation (1974)
    Springer
    Solar physics 34 (1974), S. 223-229 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Data on high energy electrons and protons in different energy windows are analyzed and compared for two solar flares which occurred at 37 W solar longitude on the 25th February 1969 and the 29th March 1970. While the data for the first of these flares can be interpreted in the framework of a diffusion model with suitable values of the parallel diffusion coefficient, in order to explain the time behaviour of the different particles after the second event, we are led to suppose that the coronal magnetic fields are such that particles of different rigidity are ejected at different longitudes and that there is no good magnetic connection of the Earth with the flare region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149615
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  • 6
    Electronic Resource
    Electronic Resource
    Polymer crystallization by chemical nucleation (1983)
    [s.l.] : Nature Publishing Group
    Nature 304 (1983), S. 432-434 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has recently been discovered7 that organic nucleating agents do not behave as heterogeneous substrates in lowering the energy barrier towards crystal nucleation but dissolve in the polymer and react as true chemical reagents with the molten macromolecule to form the nucleating species. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/304432a0
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  • 7
    Electronic Resource
    Electronic Resource
    Retention of some glucosinolates in anion exchange chromatography. Part II: Qualitative study on a styrene-divinylbenzene copolymeric anion exchanger (1994)
    Springer
    Chromatographia 38 (1994), S. 585-590 
    Details
    ISSN: 1612-1112
    Keywords: Ion chromatography ; Styrene DVB anion exchanger ; Organic anions ; Glucosinolates ; Rapeseed oil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention and separation of glucosinolates, as organic anions, were studied on a styrene-divinylbenzene copolymeric anion exchanger under isocratic elution conditions. The effects of the nature and concentration of different inorganic and organic eluent anions, and the influence of acetonitrile addition to the aqueous buffered mobile phase are investigated. For the alkanesulfonate eluent anions, elution strength increases noticeably with alkyl chain length. The plots of capacity factors of glucosinolates versus the reciprocal of organic eluent ion concentration show good linearity. The values of the slope and y-intercept data confirm the importance of the reverse phase interactions with respect to the ion exchange interactions in the glucosinolate retention mechanism. Our results prove that the isocratic analysis of intact glucosinolates on a polymeric anion exchanger is a suitable and convenient method that should be used as a complement to the current ion pairing chromatographic method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277158
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  • 8
    Electronic Resource
    Electronic Resource
    Étude du comportement viscoélastique du polycarbonate de bisphénol-A partiellement cristallisé (1969)
    Springer
    Rheologica acta 8 (1969), S. 510-519 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Summary The stress relaxation of the polycarbonate of bisphenol-A was systematically studied as a function of the degree of crystallinity (from zero to 18%). The time-temperature equivalence principle was found applicable and for each degree of crystallinity a separate master curve could be constructed. The amount of crystalline material modifies gradually the shape of the master curve. The glass transition region is broadened and the flow region eliminated above 9% crystallinity. The experimental values of the shift factor fit a unic W.L.F. equation. The characteristic reference temperatureT i rises progressively with the degree of crystallinity.
    Notes: Résumé On a étudié par la méthode de la relaxation de la contrainte la variation du comportement viscoélastique du polycarbonate de bisphénol-A de cristallinité variable entre zéro et 18%. On a pu appliquer le principe d'équivalence des effets du temps et de la température et construire pour chaque taux de cristallinité une courbe pilote. La cristallisation entraîne une modification progressive de la forme de la courbe pilote. La région de transition vitreuse s'élargit à mesure que le taux de cristallinité s'élève. A partir d'un taux de cristallinité de 9% la région d'écoulement est totalement supprimée. On constate aussi que les valeurs expérimentales du facteur de temps obéissent à l'équation de W.L.F. et que la température caractéristiqueT i s'élève légèrement avec le taux de cristallinité.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01976237
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  • 9
    Electronic Resource
    Electronic Resource
    Polyvinyl alcohol-copper II complex: Characterization and practical applications (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 127-133 
    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: A method to obtain microscopic and macroscopic coatings with improved resistance to debonding is described. The procedure, based on polymer-metal complexes, involved the adsorption on inorganic substrates of a poly(vinyl alcohol)-copper II chelate that is also able to catalyze the polymerization of monomers or prepolymers with grafting. The molecular structure of the complex, its adsorption on inorganic surfaces, and the mechanism of the polymerization induced by the supported catalyst are summarized. Much emphasis is placed on application of this technology to the realization of encapsulated filler and pigment and of coatings with improved adherence and solvent resistance. In the field of composite materials, it is demonstrated from several examples that the encapsulation of the filler can be a way to block chemical interactions between filler and matrix, to promote filler dispersion, and to improve mechanical properties.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760290208
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  • 10
    Electronic Resource
    Electronic Resource
    Nucleation in polymer crystallization: A physical or a chemical mechanism?Presented as an invited lecture at the 19th Europhyslcs Conference on Macromolecular Physics, Polymer Crystallization, Gargnano, Italy, June 1988. (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 270-278 
    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: Primary nucleation is in general heterogeneous in polymer crystallization. In unseeded polymers, the crystallization originates from a very small concentration (〈0.1 percent) of unknown submicroscopic heterogeneous nuclei. Only in three cases have the nucleation mechanisms been identified with precision. The first example is self-nucleation, which relates to the nucleation of a polymer melt by fragments of its own crystals previously present in the melt. Another example of heterogeneous nucleation is represented by epitaxial nucleation of polymers on inorganic and organic substrates recently established by Lotz and Wittmann. More recently, it was discovered that finely divided organic salts added to reactive polymers do not behave as inert heterogeneous substrates but rather dissolve and cut molten macromolecules producing ionic chain ends which precipitate into the melt and form organized aggregates which are the true nucleating species. It is clearly shown that mechanisms of physical and chemical origin are involved in heterogeneous primary nucleation of polymer crystallization.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760300504
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