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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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  • 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
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Viscoelastic behavior of the polycarbonate of bisphenol A (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 447-459 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    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 viscoelastic properties and thermal expansion properties of bisphenol A polycarbonate have been studied in the neighborhood of the major glass transition temperature. A discussion is given of the possible relation of these properties to the unusual impact resistance of this polymer in the glassy state.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090206
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of weak (2.0–2.5) dissociation constants of non-UV absorbing solutes by capillary electrophoresis (1998)
    Springer
    Chromatographia 48 (1998), S. 529-534 
    Details
    ISSN: 1612-1112
    Keywords: Capillary electrophoresis ; pK A determination ; Indirect UV detection ; Alkyl-alkyl phosphonic acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Capillary electrophoresis (CE) has proved to be a fast and convenient method for the determination of the dissociation constants of non-UV absorbing solutes in the acidic pK A range (2.0–2.5). The electroosmotic flow was reversed by washing the capillary with 0.2% polybren aqueous solution. A series of background electrolytes was prepared with phenylphosphonic acid (pK A=1.29) and β-alanine (pK A=3.55) with the same ionic strength and a high buffer capacity in order to improve the repeatability (0.1–0.2 %) of the electrophoretic mobility and to determine the values of pK A accurately. This procedure was applied to the determination of the dissociation constants of several alkyl-alkylphosphonic acids whose pK A values have not yet been published in the literature. In this work, their dissociation constants have been found to vary between 1.91 and 2.34 for alkyl-methylphosphonic acids and between 2.10 and 2.38 for alkyl-ethylphosphonic acids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466645
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  • 10
    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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