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  • Polymer and Materials Science  (30)
  • Organic Chemistry  (7)
  • Mice  (4)
  • Statistical physics  (4)
  • Letters  (3)
  • Physicochemical Phenomena  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Modeling the structure of the combining site of an antisweet taste ligand monoclonal antibody NC10.14 (1996)
    New York : Wiley-Blackwell
    Biopolymers 39 (1996), S. 395-406 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We report the predicted combining site structure of the monoclonal antibody fragment. NC10.14, which is specific for the superpotent sweetener, N-(p-cyanophenyl-N′-(diphenylmethyl)guanidine acetic acid, using computer-aided molecular modeling and experimental methods, such as fluorescence spectroscopy and circular dichroism. This is the first computer-aided modeling study on a λ-chain antibody fragment. We have also identified the amino acids that are involved in ligand binding. Aromatic residues. L:91(W), L:96(W), and H:100G(Y) are predicted to make van der Waals contacts with the p-cyanophenyl moiety of the ligand. Residue H:56(K) is predicted to provide a counterion for the acetic acid moiety, and H:50(E) provides the negatively charged potential for interaction with the positive guanidinium group. We also make a comparison of the binding site architecture of NC10.14 with that of a related monoclonal antibody fragment NC6.8. © 1996 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Die Konstitution des Alkaloides Juliprosopin aus Prosopisjuliflora A. Dc. 176. Mitteilung über organische Naturstoffe175. Mitt. s. [1]. (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 2119-2129 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Structure of the Alkaloid Juliprosopine from Prosopis juliflora A. Dc.A new alkaloid, juliprosopine, has been isolated from Prosopis juliflora A. Dc. (Leguminosae), for which structure 1 is proposed. The piperidine moiety could be elucidated on the basis of spectroscopic data (MS., 1H-NMR., 13C-NMR.) of juliprosopine and the derivatives 2-4. The central hexahydroindolizine part and its substitution pattern has been determined mainly on the bases of the Hofmann-degradation product 11, which yielded the hydrogenation products 13 and 14. By ozonolysis 11 was converted to 16 and 18. It is proposed that juliprosopine was built up in nature by two ‘monomeric’ Prosopis alkaloids and one dihydropyrrol unit.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630738
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  • 3
    Electronic Resource
    Electronic Resource
    On the hydrogen bonds in the helical structure proposed for cellulose I (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 15 (1971), S. 2597-2599 
    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
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1971.070151025
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  • 4
    Electronic Resource
    Electronic Resource
    Crystalline character of native and chemically treated egyptian cottons. II. Computation of variance of x-ray line profile and paracrystalline lattice distortions (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 395-406 
    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: A variance range analysis of the x-ray line profiles for seven cottons (native, ureatreated, and mercerized) has been carried out to get two estimates of the crystallite size from (1) the slope and (2) the variance intercept. Assuming the crystallite length of cellulose to be the same in ramie and native cottons under ideal conditions of growth, the relative fluctuation of the repeat length along the b-axis has been calculated for all the samples. This degree of paracrystalline lattice distortions is negatively correlated with the fiber bundle strength at zero gauge and appears to be the same as the imperfections referred to in the weak link theories of fiber strength. While the orientation parameters are also well correlated with strength, the degree of crystallinity does not seem to have any influence. Wilson's rigorous mathematical treatment of the number-average particle size, in relation to the two estimates from the variance slope and intercept as well as the particle size distribution, has been successfully applied for the first time to cotton fibers leading to a clearer understanding of crystallite size-strength relationship.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160211
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  • 5
    Electronic Resource
    Electronic Resource
    Acyclic diene metathesis (ADMET) depolymerization of functionalized furan-based polymers (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 2469-2477 
    Details
    ISSN: 0887-624X
    Keywords: acyclic dience metathesis ; ADMET ; depolymerization ; aqueous ring-opening metathesis polymerization ; ROMP ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acyclic dience metathesis (ADMET) depolymerization of functionalized furan-based polymers prepared via aqueous ring-opening polymerization of 7-oxanobornenes has been investigated. Results indicate that while very high molecular weight poly [exo-N-methyl-7-oxabicyclo [2.2.1] hept-2,5-diene-2,3-dicarboximide] can be depolymerized to oligomers with ease, poly [2,3-dicarbomethoxy-7-oxabicyclo [2.2.1] hept-2,5-diene] is more resistant to depolymerization under similar conditions. This difference may be due to differential interaction of the carbonyls in the side chains with the metal atom of the catalyst in the proposed metallacyclobutane intermediate. ADMET depolymerization of poly [2,3-bis (trifluoromethyl)-7-oxabicyclo [2.2.1] hept-2,5-diene] was feasible, however, the extent of depolymerization was decreased due to the use of a coordinating solvent (THF) used during the depolymerization process. © 1994 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321308
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  • 6
    Electronic Resource
    Electronic Resource
    Radiation resistant amorphous-all aromatic polyarylene ether sulfones: Synthesis, characterization, and mechanical properties (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 287-300 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis and characterization of amorphous, aromatic, polyaryl ethers has been investigated. Detailed synthesis procedures are provided. The main thrust of these activities was to synthesize polymers which could serve as castable amorphous matrix resins for carbonfiber composites and which would be highly resistant to radiation degradation. It was important that these polymers not contain any aliphatic groups in order to contrast their behavior with the commercially available Bisphenol-A polysulfones. The approach taken was to synthesize a series of statistical or random copolymers derived from hydroquinone and biphenol together with 4,4′-dichlorodiphenyl sulfone. In order to produce copolymers of high molecular weight, modified techniques were developed which utilized potassium carbonate as a weak base and N-methyl-2-pyrrolidone as the aprotic dipolar solvent. Detailed procedures are provided in this paper for the synthesis of high molecular weight copolymers of this type. In addition, stress-strain, dynamic mechanical properties and preliminary electron beam (e-beam) degradation studies are reported significantly. Improved mechanical property retention after e-beam exposure was observed with the all aromatic polyether sulfones.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1986.080240208
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  • 7
    Electronic Resource
    Electronic Resource
    Multifunctional captodative monomers: Urea-containing dehydroalanines (1988)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 26 (1988), S. 233-239 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1988.140260504
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on polymers prepared from thiophenol: An electroanalytical approach. II. Studies on thiophenol formaldehyde resins (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 102 (1982), S. 29-38 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Messungen der verschiedenen elektrischen Eigenschaften wie Dielektrizitätskonstante (ε′) und Verlustwinkel (tan δ), elektrische Leitfähigkeit und Untersuchungen von thermischen Depolarisationsphänomenen an Thiophenol-Formaldehyd-Harzen helfen die verschiedenen Aushärtereaktionen zu klären, die innerhalb der Proben auftreten.
    Notes: Measurements of the various electrical properties such as dielectric constant (ε′) and loss (tan δ), electrical conductivity and studies on thermal depolarization phenomena on thiophenol formaldehyde resins help to identify the various types of curing reactions occurring within the samples.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1982.051020104
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  • 9
    Electronic Resource
    Electronic Resource
    Thermally stimulated currents in thiourea formaldehyde polymers (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 82 (1979), S. 39-53 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Thioharnstoff-Formaldehyd-Polymere wurden durch Kondensation von Thioharnstoff mit Formaldehyd unter alkalischen Bedingungen synthetisiert und durch Infrarotspektroskopie charakterisiert. Die Stabilität der Proben wurde durch thermogravimetrische Analyse bestimmt. Es wurden Elektrete hergestellt, indem das Polymere bei 100-300 kV · m-1 und bei 303-353 K polarisiert wurde. Die komplexen thermischen Depolarisationsspektren wurden aufgezeichnet und analysiert. Die Ergebnisse wurden korreliert mit Untersuchungen über die Abhängigkeit der Dielektrizitätskonstante und der Gleichstromleitfähigkeit von der Temperatur.
    Notes: Thiourea formaldehyde polymers were synthesized by condensing thiourea with formaldehyde under alkaline conditions and were characterized by infrared spectroscopy. The stability of the samples was determined by thermogravimetric analysis. Electrets were prepared by polarizing the polymer at 100-300 kV m-1 and at 303-353 K. The complex thermal depolarization spectra were recorded and analysed. The results are correlated with studies on the variation of the dielectric constant and d. c. conductance as a function of the temperature.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1979.050820104
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  • 10
    Electronic Resource
    Electronic Resource
    Fast atom bombardment mass spectrometry of disaccharide polyether polyols (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 41 (1990), S. 2595-2601 
    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 products resulting from the propoxylation of sucrose and lactose under alkaline conditions have been studied using FAB mass spectrometry. Soft desorption/ionization, using fast atoms, was expected to show intense protonated molecules for each component of the reaction mixture, thus allowing the extent of propoxylation to be examined under various conditions. However, it appears that addition of the FAB matrix, namely thioglycerol, prior to mass spectral analysis, resulted in alteration of the analyte via hydrolysis/dehydration, with protonated molecules appearing only for matrix/analyte reaction products, and not the original compounds which were to be examined. The resulting mass spectra, however, provided information regarding the extent of propoxylation and were consistent with results obtained by other researchers examining acetylated sugars using CI-MS.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070411107
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