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  • Wiley-Blackwell  (542)
  • Institute of Physics  (70)
  • 1985-1989  (612)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Zur Umpolung der Reaktivität eines Carbenkohlenstoffatoms - Unerwartete elektrophile Addition an einen η2-Thiocarbenkomplex des Wolframs (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 289-290 
    Details
    ISSN: 0009-2940
    Keywords: Carbene protonation ; η2-Thiocarbene complex ; Tungsta-thia-cyclopropane ; Umpolung ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Umpolung of the Reactivity of a Carben Atom - Unexpected Electrophilic Addition to an η-Thiocarbene of TungstenTrifluoroacetic acid protonates the electrophilic carbene carbon atom of dicarbonyl(η5-cyclopentadienyl) [η2-methyl(methylthio)carbene]tungsten tetrafluoroborate (2) to provide the cationic tungsta-thia-cyclopropane complex 3. The 1H- and 13CNMR spectra of diastereomers 3a, 3b and the X-ray structure of 3a are described.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220213
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  • 2
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    Unknown
    Puzzling positron peaks in heavy-ion collisions (1987)
    Institute of Physics
    Details
    Publication Date: 1987-11-01
    Print ISSN: 0031-8949
    Electronic ISSN: 1402-4896
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 3
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    First Observation of the Exotic Nucleus 22 C (1986)
    Institute of Physics
    Details
    Publication Date: 1986-10-01
    Print ISSN: 0295-5075
    Electronic ISSN: 1286-4854
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    Ozoninduzierter Abbau von Polyoxymethylen (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 156 (1988), S. 123-137 
    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: Samples of polyoxymethylene (unstabilized and stabilized with the antiozonants N-isopropyl-N′-phenyl-p-phenylenediamin (IPPD) and bis-(1,2,3,6-tetrahydrobenzaldehyd)pentaerithritylacetal (Vulkazon AFS)) were ozonized under mechanical load in a special climate chamber. Surface damages were determined by IR-spectroscopy and scanning electron microscopy. During the ozonolysis a damaged layer is formed, the thickness of which increases with increasing time of ozonization. During this damaging reaction acetal groups are attacked and oligomers are formed.
    Notes: Proben von unstabilisiertem und mit den Antiozonantien N-Isopropyl-N′-phenyl-p-phenylendiamin (IPPD) und Bis-(1,2,3,6-tetrahydrobenzaldehyd)-pentaerithrityl-acetal (Vulkazon AFS) stabilisiertem Polyoxymethylen wurden unter mechanischer Belastung in einer Klimakammer ozonisiert. Die Schädigungen auf der Oberfläche wurden IR-spektroskopisch und rasterelektronenmikroskopisch untersucht. Während der Ozonisierung von POM bildet sich eine geschädigte Schicht, deren Dicke mit zunehmender Ozonisierungszeit wächst. Hierbei wird das Polymere an den Acetalbindungen angegriffen, wodurch Ketten gespalten werden und Oligomere entstehen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1988.051560111
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  • 5
    Electronic Resource
    Electronic Resource
    Rheological studies of creep and creep recovery of unligated fibrin clots: Comparison of clots prepared with thrombin and ancrod (1985)
    New York : Wiley-Blackwell
    Biopolymers 24 (1985), S. 461-482 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mechanical creep and creep recovery in small shearing deformations have been studied in unligated clots formed with both thrombin and ancrod. In thrombin clots, both A binding sites (which interact with “a” sites to link monomer units within a protofibril) and B sites (which interact with “b” sites to form links between protofibrils) are exposed to enable formation of linkages; in ancrod clots, only the A sites are exposed. Fine clots (with minimal lateral aggregation of protofibrils), coarse clots (with substantial aggregation of fibril bundles), and clots of intermediate coarseness were compared. Fine thrombin clots showed less creep at short times but more creep at long times than coarse or intermediate clots and had more irrecoverable deformation relative to the initial elastic deformation. Ancrod clots had greater irrecoverable deformation than the corresponding thrombin clots, both fine and coarse. The permanent deformation in fine ancrod clots was enormous, corresponding almost to fluid character; the rate of permanent deformation was larger than that in fine thrombin clots by more than two orders of magnitude. For all types of clots, differential measurements of compliance (or its reciprocal, elastic modulus), as well as the applicability of the Boltzmann superposition principle to calculation of creep recovery, showed that the overall density of structure remained constant throughout the mechanical history; i.e., if structural elements were breaking, they were reforming at the same rate in different configurations. The possibility that the weakness of ancrod clots is attributable to partial degradation of α-chains rather than absence of Bb linkages was eliminated by comparisons of clots made with thrombin, ancrod, and ancrod plus thrombin; the last two showed identical partial degradation of α-chains (by gel electrophoresis), but the first and third had essentially identical initial elastic moduli and creep behavior. Two alternative mechanisms for irrecoverable deformation in fine clots are discussed, involving rupture of protofibrils and slippage of twisted segments, respectively.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360240304
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  • 6
    Electronic Resource
    Electronic Resource
    Secondary structure of peptides. 18. 15N-nmr and 13C-nmr CP/MAS investigation of the primary and secondary structure of (Ala/Val) copolypeptides (1985)
    New York : Wiley-Blackwell
    Biopolymers 24 (1985), S. 2113-2129 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Various copolypeptides were prepared by benzylamine or tertiary amine-initiated copolymerizations of alanine-N-carboxyanhydride (Ala-NCA) and valine-N-carboxyanhydride (Val-NCA). The number-average molecular weights of these copolypeptides were detemined by 1H-nmr spectroscopic end-group analyses and viscosity measurements. The sequences were characterized by 15N-nmr spectra in solution, and the average lengths of the homogeneous blocks were determined from the signal intensities. The 50.3-and 75.4-MHz 13C-nmr CP/MAS spectra of the solid copolypeptides are not sensitive to sequence effects, but allow qualitative and quantitative analyses of the secondary structures. In contrast to other methods, the 13C-nmr spectra allow determination of the extent to which individual amino acids are incorporated into β-sheet or α-helix phases. Depending on primary structure and molecular weight, the secondary structure of (Ala/Val) copolypeptides may vary significantly. Both monomer units may be predominantly helical or predominantly β-sheet structure, or the Val units may prefer the β-sheet structure with most Ala-units forming β-helices. However, these secondary structures are more or less thermodynamically unstable and revert to the stable conformations on reprecipitation from trifluoroacetic acid/water.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360241108
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese verschiedener Oxincellulosen für spurenanalytische Anreicherungsverfahren (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 170 (1989), S. 159-172 
    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: Some routes to synthetize covalently bound chelating groups as 8-hydroxyquinoline or 8-hydroxyquinoline-5-sulfonic acid to cellulose are given. The products show a capacity of 500-800 μmol/g, fast kinetics of exchange and good stability against the eluent. The apparent stability constant of the complexes with Zn2+ are around 2 · 105 mol-1 dm3.
    Notes: Es werden mehrere Synthesemöglichkeiten für die Herstellung von an Cellulose immobilisierten 8-Hydroxychinolin- und 8-Hydroxychinolin-5-sulfonsäure-Derivaten beschrieben, die zu einem Produkt mit einer Kapazität von 500-800 μmol/g, hoher Austauschgeschwindigkeit und guter Stabilität gegenüber dem Eluenten führen. Die scheinbare Komplexbildungskonstante der Oxincellulosen mit Zn2+ ist etwa 2 · 105 mol-1 dm3.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051700112
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  • 8
    Electronic Resource
    Electronic Resource
    Ammoniakdiffusion in Polymerfilmen (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 173 (1989), S. 69-84 
    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: With the help of a novel test method, diffusion-coefficients of ammonia were determined in 22 transparent, filmforming polymers at room temperature. This method is based upon the UV-VIS-spectroscopically followable reversible reaction of ammonia with 4-nitro phenol to a Meisenheimer-complex.The dye-building reaction was studied and analyzed by a simple approximation of the diffusion equation. Diffusion coefficients obtained are in good agreement with the few available data in the literature.The dependence of the NH3-diffusion coefficients upon the polymer structure corresponds with the obtained diffusion coefficients, which are known for permanent gases.The described method allows the measurement of diffusion coefficients, which are distinguished up to three orders of magnitude, without any problem (ethylcellulose: 1,07 · 10-7 cm2 · s-1; poly(vinylalcohol): 0.9 · 10-10 cm2 · s-1).
    Notes: Mit Hilfe einer neuartigen Untersuchungsmethode wurden die Diffusionskoeffizienten von Ammoniak (NH3) in 22 transparenten filmbildenden Polymeren bei Raumtemperatur bestimmt. Die Methode beruht auf der UV-VIS-spektroskopisch verfolgbaren reversiblen Reaktion von Ammoniak mit 4-Nitrophenol zu einem 4-Nitrophenolat-Ammoniak-Meisenheimer-Komplex.Die Farbbildungsreaktion im Polymerfilm wurde untersucht und anhand einer einfachen Näherung der Diffusionsgleichung ausgewertet. Die erhaltenen Diffusionskoeffizienten stimmen sehr gut mit den wenigen verfügbaren Literaturwerten überein.Die Abhängigkeit der NH3-Diffusionskoeffizienten von der Polymerstruktur ist weitgehend der für permanente Gase bekannten analog.Die beschriebene Methode erlaubt problemlos, Diffusionskoeffizienten zu messen, die sich bis zu drei Größenordnungen unterscheiden (Ethylcellulose: 1,07 · 10-7 cm2 · s-1; Polyvinylalkohol: 0,9 · 10-10 cm2 · s-1).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051730106
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  • 9
    Electronic Resource
    Electronic Resource
    Chromatography and electron microscopy of cross-linked fibrin polymers - a new model describing the cross-linking at the DD-trans contact of the fibrin moleculesa part of this work was presented at the xth international congress of thrombosis and haemostasis, san diego, usa, july 14-19, 1985, and was published in abstract form (1985) [thromb. haemostas. 54, 937]. (1988)
    New York : Wiley-Blackwell
    Biopolymers 27 (1988), S. 1733-1748 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polymerization of fibrin molecules results in the formation of a double-stranded protofibril. Although convincing data have not been presented, it is classically believed that γ-chain cross-linking of fibrin molecules occurs between the longitudinal end-to-end contacts (DD-long contacts) of the molecules within each of the two strands of a protofibril (intrastrand cross-linking). In this investigation the question addressed was whether γ-chain cross-linking takes place across the two strands (interstrand cross-linking) between the transversal half-staggered contacts of the molecules. Demonstration of double-stranded protofibrils in the presence of urea would indicate an interstrand cross-linking, whereas in the case of intrastrand cross-linking, the chaotropic agent urea would dissociate the double-stranded structure to form single-stranded fibrils. Protofibrils were obtained by generating soluble cross-linked fibrin polymers (sXLFbP): After incubation of souble fibrin polymers with Factor XIIIa at 37°C, the polymerization and cross-linking reaction was stopped by the addition of 6M urea and EDTA. Gel filtration of the reaction mixture in the presence of 3M urea was effect in separating sXLFbP from monomeric molecules. The sXLFbP-containing fractions were adsorbed onto mica in the presence of different concentrations of urea and investigated by electron microscopy after rotary shadowing. In the presence of 3M urea the sXLFbP appeared as double-stranded protofibrils. In the presence of 4M urea some parts of the double-stranded structure were found to be unfolded whereas in the presence of 6M urea multiple-bended single-stranded fibrils were observed. SDS-polyacrylamide gel electrophoresis of the sXLFbP demonstrated no γ-chain cross-linking within the protofibrils. Ultracentrifugation of the sXLFbP showed that in the presence of 3M urea noncross-linked fibrin polymers dissociated to monomeric molecules. When sXLFbP was centrifuged into 6M urea on sucrose density gradients, no reduction of the polymer size could be observed. The data indicate that γ-chain cross-linking occurs between the transversal contacts of the fibrin molecules within a protofibril, thus generating interstrand cross-linking. A model of the cross-linking of polymerized fibrin molecules is developed and the term DD-trans contact is proposed for this specific alignment of the D-domains.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360271104
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  • 10
    Electronic Resource
    Electronic Resource
    Chemistry-Experiment and Theory. Von B. G. Segal. John Wiley & Sons, New York - Chichester - Brisbane - Toronto - Singapore 1985. 1000 S., ca. 42.50 $. ISBN 0-471-80811-3 (1986)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 20 (1986), S. 67-67 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19860200207
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