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  • Wiley-Blackwell  (951)
  • 1985-1989  (951)
  • 1960-1964
  • 1955-1959
  • 1987  (951)
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  • 1985-1989  (951)
  • 1960-1964
  • 1955-1959
Year
  • 1
    Electronic Resource
    Electronic Resource
    Kristallinflüssige trans-4-(ω-Cyanalkyl)cyclohexylester und 4-(ω-Cyanalkyl)phenylester (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 963-974 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid Crystalline trans-4-(ω-Cyanalkyl)cyclohexylester and 4-(ω-Cyanalkyl)phenylestersThe synthesis of the title esters 1 and 2a-e (n = 0 - 3) and their mesomorphic properties are described. When the alkyl-spacer n between the polar CN-group and the cyclohexane ring of cyanalkyl-cyclohexylesters 1 is increased the difference of the clearing points between the phenylesters 2 and the cyclohexylesters 1 decreases to nearly zero. The reason of higher clearing temperatures of 2 is a dynamic conformational effect of ring inversion of cyclohexane in the ester 1 with two polar substituents at the ring.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290604
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  • 2
    Electronic Resource
    Electronic Resource
    Vanadium containing bromoperoxidase: An example of an oxidoreductase with high operational stability in aqueous and organic mediaSend all correspondence to Ms. G. E. E. van Noppen, F.I.L., Publications Secretary, Laoratory of Biochemistry, University of Amsterdam, P.O. Box 20151, 1000 HD Amsterdam, The Netherlands. (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 607-610 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The conversion is described of phenolsulphonephtalein (phenol red) to 3,3′,5,5′-tetrabromophenolsulphonephthalein (bromophenol blue) by bromoper-oxidase from the brown alga Ascophyllum nodosum. This reaction provides a convenient assay for the detection of bromoperoxidase activity in vitro. Bromoperoxidase was shown to be stable under turnover conditions for three weeks at room temperature, catalyzing the bromination of phenol red into bromophenol blue. When stored at room temperature in organic sol vents such as acetone, methanol, ethanol [present up to 60% (v/v)], and 1-propanol [40% (v/v)], bromoperoxidase was stable for more than one month. As far as we know this is the first example of an oxidoreductase which displays such great stability. This enhances the applicability of the enzyme in organic synthesis.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300504
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  • 3
    Electronic Resource
    Electronic Resource
    High temperature sulfidation of Fe-Mn alloys and Mn in H2-H2SDedicated to Professor Dr. Alfred Rahmel on the occasion of his 60th birthday (1987)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 38 (1987), S. 498-506 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Sulfidierung von Fe-Mn-Legierungen und Mn bei hohen TemperaturenDie Sulfidierung von Fe-Mn-Legierungen mit 20-50% Mn und von reinem Mn wurde bei 973 K, 1073 K und 1173 K in H2-H2S Atmosphären bei konstantem pS2 oder konstantem pH2S/pH2 untersucht, unter Bedingungen, bei denen nur MnS gebildet wird. Die Sulfidierungskinetik ist vorwiegend parabolisch, aber bedingt durch zwei verschiedene Diffusionsvorgänge. Bei der Sulfidierung der Fe-Mn-Legierungen bei 973 K und 1073 K ist die Diffusion der Mn-Atome in der Legierung der geschwindigkeitsbestimmende Vorgang, und es wird eine verzahnte Grenzfläche Sulfidschicht/Legierung beobachtet. Bei 1173 K erfolgt ein Übergang zur Kontrolle der Sulfidierungsgeschwindigkeit durch Diffusion des Mn in der Sulfidschicht und ein Übergang von der verzahnten Grenzfläche zur ebenen Grenzfläche.
    Notes: The sulfidation behaviour of a range of Fe-Mn alloys and pure Mn were studied at 973 K, 1073 K, and 1173 K in H2-H2S atmospheres at constant pS2 or constant pH2S/pH2. The sulfidation kinetics were parabolic in most cases, but two different diffusion processes affect the kinetics. In the sulfidation of the Fe-Mn alloys at 973 K and 1073 K, the diffusion of manganese atoms in the alloy is the rate-determining step and an interlocked scale/alloy interface is observed. At 1173 K there is a transition to rate-control by the diffusion of manganese in the sulfide scale connected with transition from rugged to a planar scale/alloy interface.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19870380907
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  • 4
    Electronic Resource
    Electronic Resource
    Thermotropic rigid-chain copolymers: X-ray investigations of the structure (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 25 (1987), S. 2471-2485 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The structure of a rigid rodlike random copolyester, consisting mainly of p-hydroxybenzoic acid, hydroquinone, and carbonyl units, was investigated by means of wide-angle x-ray scattering. The lateral order of the chain molecules was found to be short-range in the nematic melt, in close agreement with the spatial order in the melt of flexible chain molecules. The packing density was found to be surprisingly large in the anisotropic melt. The low-temperature solid state consists of two phases, namely a frozen-in nematic and a three-dimensionally ordered crystal phase. Quenched samples were found to have a degree of crystallinity of about 25%, whereas well-annealed samples may display a degree of crystallinity of up to 70%. The ordered phase apparently displays an orthorhombic unit cell. Its dimensions indicate that a cocrystallization of the comonomers has taken place. On the basis of the observations that the lattice dimensions change continuously as a function of annealing parameters and taking into account the fact that the transition enthalpy, entropy, and volume are smaller by at least one order of magnitude in comparison to those found for crystals of flexible chains, we arrived at the conclusion that the polymer displays a rotationally disordered crystalline state.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1987.090251204
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  • 5
    Electronic Resource
    Electronic Resource
    Simulation of planar welding flows: Part 2. Strain history, stress calculation, and experimental comparison (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1390-1398 
    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 numerical method is described for calculating the stress a viscoelastic melt exhibits in a flow, based on approximate kinematics. The method assumes that the kinematics are reasonably close to those of a shear-thinning fluid such as the Carreau model. The strain history of a given flow and the resulting stress are calculated via a tracking method from finite element kinematics. Fullfield flow birefringence experiments were done for lowdensity polyethylene and polystyrene flowing past a thin plate divider in a 1.254-mm planar slit die. By digitally analyzing birefringence photographs of the flow field, the birefringence was measured over two dimensions. These birefringence results are in good agreement with birefringence fields calculated from the numerical simulations and the stress-optical law. The flow fields were most highly oriented in a region surrounding the weld interface just downstream of the plate divider. This orientation relaxed farther downstream, with polystyrene relaxing faster than low-density polyethylene.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760271807
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  • 6
    Electronic Resource
    Electronic Resource
    Structural analysis of phospholipids by fast atom bombardment/collisional activation with a tandem mass spectrometerPart VII of the series Studies in FD and FAB mass spectrometry. For part VI See Ref. 1. (1987)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 1 (1987), S. 126-128 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290010712
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  • 7
    Electronic Resource
    Electronic Resource
    The infrared absorption characteristics of poly(methyl methacrylate) doped with luminescent materials (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 443-446 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Infrarotspektren von Poly(methylmethacrylat)-Probenn die mit verschiedenen lumineszierenden Substanzen dotiert wurden, weisen außer beim β-Naphthol keine wesentlichen Änderungen der Lage und Intensität der Absorptionsbanden auf. Daher wird angenommen, daß zwischen den meisten Dotierungsmitteln und PMMA keine Wechselwirkung besteht, während beim β-Naphthol zwischen benachbarten Molekülen in der Polymermatrix Wasserstoffbindungen auftreten.
    Notes: The infrared spectra of poly(methyl methacrylate) samples doped with different luminescent materials show no drastic changes in the position and intensity of the absorption bands, except in case of β-naphthol. From this it is supposed that there is no interaction between the dopant and PMMA with most of the investigated materials, while with β-naphthol hydrogen bonding between adjacent molecules in the polymer matrix is observed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010380708
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  • 8
    Electronic Resource
    Electronic Resource
    N-Alkylurotropiniumpolyiodide - Darstellung und Untersuchung der elektrischen und magnetischen Eigenschaften (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 555 (1987), S. 183-191 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N-Alkylurotropiniumpolyiodides  -  Preparation, Investigation of the Electrical and Magnetic PropertiesThe formation of N-alkylurotropiniumpolyiodides is investigated by a potentiometric technique. The polyiodides are prepared, analysed and the electrical and magnetic properties are measured. All prepared polyiodides are diamagnetic. The magnetic susceptibility doesnť depend on the magnetic field strength and on the temperature. The electrical conductivity increases with increasing iodine contents. The values are between 10-11S/cm for the triiodides and 10-5S/cm for the heptaiodides. The current passage is realized with priority by electrontransfer in the anion lattice.
    Notes: Mittels einer potentiometrischen Meßanordnung wird die Bildung von N-Alkylurotropiniumpolyiodiden untersucht. Die Polyiodide werden präpariert, analysiert und ihre elektrischen sowie magnetischen Eigenschaften gemessen. Alle dargestellten Polyiodide sind diamagnetisch. Die magnetische Suszeptibilität ist unabhängig von der magnetischen Feldstärke und der Temperatur. Die elektrische Leitfähigkeit steigt mit dem Iodgehalt. Sie liegt bei Raumtemperatur zwischen 10-11S/cm für die Triiodide und 10-5S/cm für die Heptaiodide. Der Stromtransport wird vorrangig durch Elektronenüberführung im Anionenteilgitter realisiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875551220
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  • 9
    Electronic Resource
    Electronic Resource
    Lineare Additionspolymere aus Bisphenol-A-diglycidylether und primären Monoaminen. Unvernetzte Epoxid-Amin-Additionspolymere. 1716. Mitteilung über unvernetzte Epoxid-Amin-Additionspolymere siehe [1] (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 293-299 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The copolymerization of hisphenol-A-diglycidylether and a number of aromatic, araliphatic, cycloaliphatic and hydroxy-substituted aliphatic primary monoamines in bulk at temperatures between 20 and 130°C results in linear poly(aminodiols). The structure of the polymers was determined by III-NMR, 13C-NMR and IR spectroscopy. Furthermore, the linear structure of the addition polymers was verified by the analytical and spectroscopic properties of the acetylation products which were characterized as poly(aminodiacetates).
    Notes: Die Additionspolymerisation von Bisphenol-A-diglycidylether (DGEBA) an aromatische, araliphatische, cycloaliphatische und hydroxysubstituierte aliphatische primäre Monoamine führt in der Schmelze bei 20 bis 130°C zu linearen Poly(aminodiolen) mit Molekülmassen M̄n = 10000 bis 20000 g. mol-1. Die Struktur der Additionspolymere wird durch 1H- und 13C-NMR- und IR-Spektroskopie, C,H,N-Analysen und durch polymeranaloge Acetylierung der Hydroxylgruppen belegt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010380509
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  • 10
    Electronic Resource
    Electronic Resource
    The crystal structure of d(GGm5CCGGCC): The effect of methylation on A-DNA structure and stability (1987)
    New York : Wiley-Blackwell
    Biopolymers 26 (1987), S. S145 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We describe the crystal structure of an octameric DNA sequence, d(GGm5CCGGCC), at 2.25 Å resolution. The sequence contains one C5-methylated cytosine per DNA strand. This methylation corresponds to that utilized in vivo by the HaeIII restriction modification system. The present structure is compared to that of the unmethylated octamer solved previously as well as to other A-DNA crystal structures. It retains the characteristics seen in these other DNA molecules, i.e., reduced base-pair tilt angles and increased major groove width, indicating that the presence of the methyl groups does not drastically affect the A-DNA backbone conformation. The position of the methyl groups appears to block the major grove, thus preventing potential sequence-specific protein interactions. In addition, the presence of these hydrophobic substituents may enhance the overall stability of the A-DNA conformation.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360260014
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