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  • Polymer and Materials Science  (7)
  • 550 - Earth sciences  (2)
  • Superfluidity and superconductivity
  • 2005-2009  (1)
  • 1990-1994  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Heavy metal binding to heparin disaccharides. II. First evidence for zinc chelation (1992)
    New York : Wiley-Blackwell
    Biopolymers 32 (1992), S. 597-619 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: To map out the heavy metal binding sites of iduronic acid containing oligosaccharides isolated from human kidneys, we studied Zn (II) binding by nuclear magnetic resonance (NMR) and molecular modeling to two disaccharides isolated after nitrous acid depolymerization of heparin and two synthetic disaccharides representative of the heparin structure, namely, IdopA2S(α1,4) AnManOH, 1a, IdopA2S(α1,4)AnManOH6S, 1b, IdopA2S-(α1,4) GlcNSαMe, 2a, and IdopA2S(α1,4)GlcNS6SαMe, 2b (see previous article in this series). A conformational analysis of the metal free and metal bound solutions was made by comparing calculated 〈(NOE)〉s, 〈T1〉s, and 〈J〉s to experimental values. The 1C4, 4C1, and 2S0 conformations of the L-idopyranosiduronate ring and the 4E and 4T3 of the anhydro-D-mannitol ring are evaluated as are rotations about the C5-C6 hydroxymethylene of the AnManOH (6S) or GlcNS(6S) residues. The NOE between IdopA2S H1 and H3 and the known NOE between H2 and H5, as well as the T1 of IdopA2S H3, are introduced as NMR observables sensitive to the IdopA2S ring conformation. Similarly, a NOE between IdopA2S H5 and AnManOH (6S) or GlcNS (6S) H3 was observed that directly restricts the allowed interglycosidic conformational space. For all disaccharides, the Zn(II) bound spectral data are consistent with models in which these motions are partially “frozen” such that the 1C4 conformation of the IdopA2S is stabilized along with the 4T3 conformation of the AnManOH (6S) ring. The interglycosidic conformation is also stabilized in one of two minima. Electrostatic potential energy calculations gave the best overall agreement with experiment and suggest metal binding conformations with the carboxylate and ring oxygen of the IdopA2S residues (1C4 conformation) and either O3 of the GlcNS (6S) residues or the sulfate oxygens of the 6-sulphate for 2b providing additional chelating sites. These chelation models concur with the observation of marked 13C and 1H NMR chemical shifts for the IdopA2S resonances and of GlcNS H3 for 2a and GlcNS6S C6 for 2b. This study of model compounds implicates the IdopA2S(α1,4) GlcNS6S group as part of the heavy metal binding site in biologically important acidic oligosaccharides such as heparin.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360320604
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  • 2
    Electronic Resource
    Electronic Resource
    Heavy metal binding to heparin disaccharides. I. Iduronic acid is the main binding site (1992)
    New York : Wiley-Blackwell
    Biopolymers 32 (1992), S. 585-596 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: As model compounds for Ni(II)-binding heparin-like compounds isolated from human kidneys (Templeton, D. M. & Sarkar, B. (1985) Biochem. J. 230 35-42.), we investigated two disaccharides - 4-O-(2-O-sulfo-α-L-idopyranosyluronic acid)-2,5-anhydro-D-mannitol, disodium salt (1a), and 4-O-(2-O-sulfo-α-L-idopyranosyluronic acid)-6-O-sulfo-2,5-an-hydro-D-mannitol, trisodium salt (1b) - that were isolated from heparin after nitrous acid hydrolysis and reduction. The monosulfate (1a) was active whereas the disulfate (1b) was inactive in a high-performance liquid chromatography (HPLC) binding assay with the tracer ions 63Ni(II) 54Mn(II), 65Zn(II), and 109Cd(II). This result is in accord with the isolation of two 67Cu(II) and 63Ni(II) binding fractions from a complete pool of nitrous-acid-derived heparin disaccharides using sulfate gradients and a MonoQ anion exchange column on an FPLC system. One was identified as compound (1a) and the other as a tetrasulfated trisaccharide by high resolution FAB-MS, NMR and HPLC-PAD. Similarly, two synthetic disaccharides - methyl, 2-O-sulfo-4-O-(α-L-idopyranosyluronic acid)-2-deoxy-2-sulfamido-α-D-glucosamine, trisodium salt [IdopA2S(α1,4)GlcNSαMe,2a], and 2-O-sulfo-4-O- (α-L-idopyranosyluronic acid)-2-deoxy-2-sulfamide-6-O-sulfo-α-D-glucosamine, tetrasodium salt [IdopA2S(α1,4) GlcNS6SαMe,2b] - were shown to bind tracer amounts of 63Ni and 67Cu using chromatographic assays. Subsequently, 1H NMR titrations of 1a, 1b, 2a, and 2b with Zn(OAc)2 were analyzed to yield 1:1 Zn(II)-binding constants of 472 ± 59, 698 ± 120, 8,758 ± 2,237 and 20,100 ± 5,598M-1, respectively. The values for 2a and 2b suggest chelation. It is suggested that the idopyranosiduronic acid residue is the major metal binding site. NMR evidence for this hypothesis comes from marked 1H and 13C chemical shift changes to the iduronic acid resonances after addition of diamagnetic Zn(II) ions.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360320603
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  • 3
    Electronic Resource
    Electronic Resource
    Spectroscopic study of solid state photoreaction of di n-propyl ester of dicyano p-phenylenediacrylic acid (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 797-801 
    Details
    ISSN: 0887-624X
    Keywords: solid state photopolymerization ; exciton-phonon coupling ; homogeneous and heterogeneous reaction mechanism ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photopolymerization reaction in di n-propyl ester of dicyano p-phenylene diacrylic acid crystal is shown to be mediated by exciton-phonon coupling. Raman phonon spectra suggest that at the initial stage of reaction progress, the reactant and the product form a solid solution. In the later stage, the reactant segregates out and forms its own lattice. The polymer lattice is shown to maintain a good degree of order. Infrared and Raman spectra confirm that the polymerization occurs by cyclobutane ring formation. © 1994 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080320501
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  • 4
    Electronic Resource
    Electronic Resource
    Studies on renewable polyphenol-based cation exchange resins of moderately high capacity (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 2499-2508 
    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: Most of the commercially available ion exchange resins at present are either styrene-DVB-based or phenol-based and these are dependent on petroleum products. In view of the ever increasing demand for ion exchange resins and the petroleum crisis, the cost of these resins is going up in leaps and bounds. Although work on ion exchange resins based on naturally occurring tannins and similar materials have been reported in the literature, their low stability, insufficiently low exchange capacity, and similar other disadvantages come in the way of commercial exploitation of these products. In the present communication, studies on preparation and properties, viz., exchange capacity, hydration, swelling, stability, etc. of some effective cation exchange resins which have been obtained from a renewable natural resource of polyphenolic nature and some small proportion of phenol have been reported. The resins studied are stable and of moderately high exchange capacity (2-3 meq/g). Substituting phenol with low-priced renewable polyphenolic material, the resultant copolymer matrix after sulfonation gives ion exchange resins which are quite economic. Their properties are comparable with the commercial resins available in the market.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420915
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanism of persulfate decomposition in aqueous solution at 50°C in the presence of vinyl acetate and nitrogen (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 1061-1077 
    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 rate of the thermal decomposition of potassium persulfate has been studied in an unbuffered aqueous solution at 50°C in nitrogen atmosphere in the presence of vinyl acetate (VA) monomer (M). It has been found that the initial rate of persulfate decomposition may be written as \documentclass{article}\pagestyle{empty}\begin{document}$$ {{ - d\left( {{\rm S}_2 {\rm O}_8^{2 - } } \right)} \mathord{\left/ {\vphantom {{ - d\left( {{\rm S}_2 {\rm O}_8^{2 - } } \right)} {dt{\rm }\infty \left( {{\rm S}_{\rm 2} {\rm O}_{\rm 8}^{{\rm 2 - }} } \right)}}} \right. \kern-\nulldelimiterspace} {dt{\rm }\infty \left( {{\rm S}_{\rm 2} {\rm O}_{\rm 8}^{{\rm 2 - }} } \right)}}^{1.49 \pm 0.05} \times \left( M \right)^{0.50 \pm 0.06}$$\end{document} in the concentration range of persulfate (1.85 × 10-2-1.85 × 10-3 m/dm3) and VA (0.054-0.27 m/dm3). The pH of the aqueous solution of persulfate was found to decrease continuously at 50°C, but there was no measurable change of pH of the aqueous solution containing persulfate and VA at 50°C in the presence of nitrogen at the early stages of the reaction. VA, methyl acetate, and ethyl acetate have been found to undergo very slow hydrolysis in aqueous solution at 50°C. The partition coefficient (β) of the monomer between the polymer phase and the aqueous phase was found to be 21 ± 2 in the presence and absence of electrolytes (K2SO4, 10-4-10-3 m/dm3) by the bromometric estimation of the monomer present in the aqueous phase containing known amounts of monomer [1.80-2.20%, w/v] and freshly prepared polymer (0.3-0.5 g/100 mL). Above 10-2 (m/dm3) persulfate, the polymer obtained was found to be insoluble in common solvents, viz., acetone, benzene, etc. Highly purified sodium dodecyl sulfate (0.5-5.0 × 10-3 m/dm3) had no measurable effect on the rate of persulfate decomposition.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390504
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  • 6
    Electronic Resource
    Electronic Resource
    Modelling of Solid Catalyzed Propylene Polymerization (1992)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 181-183 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330640216
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  • 7
    Electronic Resource
    Electronic Resource
    Auger depth profiling of silicon dioxide on silicon: A factor analysis study (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 20 (1993), S. 60-68 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: An Auger sputter profile across the SiO2/Si interface is analysed by means of factor analysis (FA). As compared to conventional treatments of Auger data, more information is obtained in this way. In particular, the L2,3VV spectrum and the depth distribution of silicon atoms in an oxygen-deficient situation with respect to the silicon dioxide stoichiometry are provided, thereby allowing a closer insight into the chemistry of this system.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740200110
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  • 8
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    Study of the foreshocks and aftershocks of the intraplate Latur earthquake of September 30, India (1994)
    In:  Latur earthquake | Memoir / Geological Society of India ; 35
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/bookPart
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  • 9
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    Tsunami scenarios for submarine landslides in the Fram Strait (North Atlantic) (2009)
    In:  EOS, Transactions, American Geophysical Union, Fall Meeting Suppl. 90, 52
    Details
    Publication Date: 2020-02-12
    Description: The present geological setting west of Svalbard closely parallels the situation off mid-Norway after the last glaciation, when crustal unloading by melting of ice induced very large earthquakes. The modern Svalbard margin is characterized by an active fluid flow system in continental margin sediments consisting of inter-layered contourite deposits and glacigenic debris flows. Both unloading earthquakes and overpressures have been identified as key factors causing several mega-landslides off Norway during early Holocene deglaciation. The most prominent event was the Storegga Slide 8200 years BP which caused a tsunami up to 23 m high on the Faroe and Shetland islands. Numerical tsunami modeling indicates a smaller (100 m high and 130 km wide) submarine landslide west of Svalbard, which is consistent with the geological information available for the area, would cause a tsunami capable of reaching northwest Europe and threatening coastal areas. Although newly collected seismic data do not show clear precursors to incipient slope failure it may be sensible to install a tsunami warning system based on tilt-meters, which would give a warning time of one to four hours.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/conferenceObject
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