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  • Wiley-Blackwell  (200)
  • American Association for the Advancement of Science  (37)
  • 2020-2022
  • 2000-2004
  • 1990-1994  (237)
  • 1992  (237)
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  • 2020-2022
  • 2000-2004
  • 1990-1994  (237)
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  • 1
    Electronic Resource
    Electronic Resource
    Comparative semiempirical calculations of tetrazole derivatives (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 43 (1992), S. 813-826 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heats of formation, protonation energies, charge distributions, dipole moments, and geometrical structures of thirty-two 1-, 2-, 1,5-, and 2,5-substituted tetrazoles have been investigated by different semiempirical SCF MO calculations. MNDO and, in some cases, AM1 methods are the most acceptable for tetrazole derivatives. A number of linear correlations between available experimental data and the calculated energies and charge characteristics have been established. © 1992 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560430608
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  • 2
    Electronic Resource
    Electronic Resource
    Diffusion of ethylene glycol accompanied by reactions in poly(ethylene terephthalate) melts (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 707-716 
    Details
    ISSN: 0887-6266
    Keywords: poly(ethylene terphthalate), diffusion of ethylene glycol in melts of ; diffusion coefficient of ethylene glycol in PET melts ; diffusion with chemical reaction of ethyleneglycol in PET melts ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Diffusion coefficients of ethylene glycol (EG) have been measured in poly(ethylene terephthlate) (PET) melts by a quartz-spring sorption apparatus. A simple mathematical model was developed to investigate the sorption behavior accompanied by chemical reactions of EG and PET at high temperatures. Diffusion coefficients are deduced from experimental data for an asymptotically thin sample in order to minimize the effects of reactions. The diffusion coefficient of EG is strongly dependent on the vapor pressure of EG and temperature but not on the molecular weight of PET in this experimental range (degree of polymerization 80-120). The diffusion coefficient of EG in PET melt at 265°C is 2.58 × 10-7 cm2/s at the limit of zero concentration of EG. The activation energy for diffusion is 38.4 kcal/gmol, and the heat of solution for sorption is -44.9 kcal/gmol. The concentrations of the volatile materials resulting from reactions in PET-EG system were analyzed with gas chromatography. In addition, a fit of the current model to experimental data yields frequency factors for the polymerization reaction (k1) and the acetaldehyde formation reaction (k2) to be 5.84 × 108 cm3/mol ċ min and 3.90 × 1011 min-1, respectively.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090300708
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  • 3
    Electronic Resource
    Electronic Resource
    Letter to the editor (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 410-412 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290060612
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  • 4
    Electronic Resource
    Electronic Resource
    Brain Na+ K+ ATPase and cholesterol in acute experimental trypanosomiasis (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 10 (1992), S. 233-236 
    Details
    ISSN: 0263-6484
    Keywords: Brain ; Na+ -K+ ATPase ; cholesterol ; trypanosomiasis ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Brain Na+ K+ ATPase activity has been found to decrease in experimental trypanosomiasis in rats infected with Trypanosoma congolense. Some physical features that affect membrane fluidity were also observed to be altered. The levels of cholesterol in the brain and free fatty acids in the serum were found to increase in the infected animals. These findings might be relevant to the development of brain lesions.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290100404
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  • 5
    Electronic Resource
    Electronic Resource
    On the Nature of Manganese Ions in the β-Ca2 SiO4 Structure Detected by High Field ESR (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 607 (1992), S. 183-187 
    Details
    ISSN: 0044-2313
    Keywords: β-dicalcium silicate ; manganese ions ; high field ESR ; ESR fine-and hyperfine structure transitions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zum Einbau von Manganionen in die β-Ca2 SiO4-Struktur. Eine Hochfeld-ESR-StudieDie Stabilisierung der β-Dicalciumsilicat-Struktur durch Dotierung mit Mangan wurde mit Hilfe der ESR im X-Band (3,2cm) und Q-Band (8mm) und der Hochfeld-ESR (W-Band (2m)) untersucht. Bei kleinen Mn-Gehalten erfolgt der Einbau der Manganionen als Mn2+ auf Gitterplätze geringer Verzerrung. Die Erhöhung des Mn-Gehaltes verstärkt den stabilisierenden Effekt und es resultieren zusätzlich Feinstrukturmultipletts von Mn2+ -und Mn4+-Ionen, die axial bzw. rhombisch verzerrte Plätze der Dicalciumsilicat-Struktur besetzen. Die bezüglich Konzentration und Ladungszustand variable Substitution im Kationengitter steht offensichtlich im Zusammenhang mit einem Abbau von Ladungs- bzw. Bindungslängendiskrepanzen bei der Kristallisation der undotierten Verbindung und eröffnet damit die Möglichkeit der Ausbildung regulärer Einkristalle.
    Notes: The stabilization effect of dopants of the structure of β-dicalcium silicate using manganese in different oxidation states was investigated in detail by ESR at 3.2 cm (X-band), 8mm(Q-band) and by high field ESR at 2mm(W-band). The assignment of the signals was supported by corresponding single crystal measurements using X-Band and Q-band. If there are only low manganese concentrations on forming the microcrystallites the incorporated Mn2+ will be localized on less distorted sites of the lattice. Increasing the manganese concentration the Mn2+ spectra are superimposed by the fine structure of Mn2+ and of Mn4+ ions occupying distorted lattice sites with axial and rhombic symmetry. This pattern of the cation substitution represents the typical transition metal behaviour and obviously favours the formation of regular crystalline units from the melt on compensating of non-equivalent distances and charges.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926070133
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  • 6
    Electronic Resource
    Electronic Resource
    An ILU preconditioner with coupled node fill-in for iterative solution of the mixed finite element formulation of the 2D and 3D Navier-Stokes equations (1992)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 15 (1992), S. 525-544 
    Details
    ISSN: 0271-2091
    Keywords: Navier-Stokes ; Mixed formulation ; Orthomin ; Bi-CGSTAB ; Jacobi preconditioning ; SSOR ; Incomplete LU ; Inner iterations ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present paper, preconditioning of iterative equation solvers for the Navier-Stokes equations is investigated. The Navier-Stokes equations are solved for the mixed finite element formulation. The linear equation solvers used are the orthomin and the Bi-CGSTAB algorithms. The storage structure of the equation matrix is given special attention in order to avoid swapping and thereby increase the speed of the preconditioner. The preconditioners considered are Jacobian, SSOR and incomplete LU preconditioning of the matrix associated with the velocities. A new incomplete LU preconditioning with fill-in for the pressure matrix at locations in the matrix where the corner nodes are coupled is designed. For all preconditioners, inner iterations are investigated for possible improvement of the preconditioning. Numerical experiments are executed both in two and three dimensions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650150503
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  • 7
    Electronic Resource
    Electronic Resource
    Polarized Raman spectra of single-crystal barium nitroprusside trihydrate, Ba[Fe(CN)5NO]·3H2OA communication on this subject was presented at the Xth Congress and General Assembly of the IUCr, Bordeaux, France, 19-28 July 1990. (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 23 (1992), S. 131-136 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The room-temperature polarized Raman scattering of single-crystal Ba [Fe(CN)5NO] · 3H2O, space group Pbcm (D112h, No. 57), in the 2200-10 cm-1 spectral range, and a factor group analysis of the nitroprusside anion vibrational modes are presented. The near parallelism between the anion NCFeNO axis and a crystallographic axis facilitates the interpretation of the spectra. The data obtained complement already existing IR studies and the two series of results together provide reference information for the understanding of the vibrational behaviour of the recently reported electronically excited metastable states of the anion. The Raman data confirm the existence of a relatively large correlation (Davydov) splitting between NO stretching modes due to vibrational coupling between neighbouring nitrosyl groups in the lattice.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250230302
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on new non-shrinking, thermally stable araldite®-type photopolymers with pendent aryl acryloyl groups. IV. Syntheses and photoreaction of araldite®-type photoresists with pendent aryl acryloyl groupsPart III cf. Lit.10. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 71-81 
    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: Additionspolymere aus Bisphenol-A und Epichlorhydrin lassen sich mit Arylacryloylchloriden verestern. Die gebildeten Photoresists können mit UV-Licht (λ ≥ 280 nm) gehärtet werden. Aus FT-IR Messungen ergibt sich, daß die Netzwerkbildungsreaktion einem Zeitgesetz zweiter Ordnung gehorcht. DSC- und TGA-Messungen wurden durchgeführt. Die photovernetzten Polymeren weisen Glastemperaturen bis zu 171 °C auf und sind bis mindestens 350 °C thermisch stabil. Spektroskopische Daten werden aufgeführt.
    Notes: Addition polymers of bisphenol-A and epichlorohydrin can easily be esterified with aryl acryloyl chlorides to yield photosensitive polymers. The photoresists are curable with UV-irradiation (λ ≥ 280 nm). FT-IR measurements indicate that the network formation fonforms to second order kinetics. DSC and TGA measurements were carried out. The glass transition temperature of irradiated material is up to 171oC; the material is thermally stable up to 350oC. Spectral data are given.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980107
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  • 9
    Electronic Resource
    Electronic Resource
    Pterin Chemistry. Part 92.Presented at the ‘5th International Conference on Pteridines and Related Biogenic Amines and Folates’, Cairns, November 16-22, 1991. Part 91: [1].. Loading experiments with 6α,β-tetrahydro-L-[3′-2H1] biopterin (1992)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 75 (1992), S. 1237-1244 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 6α,β-Tetrahydro-L-[3′-2H1]biopterin ([3′-2H1]-1) was administered orally to two primapterinuric patients in order to investigate the biosynthetic pathway of 7-substituted pterins in humans. L-Primapterin (2) and L-biopterin were isolated from urine after loading and measured by GC/MS. L-Biopterin and L-primapterin were labelled with 2H to an equal extent. From this result, one can conclude that L-primapterin is formed from tetrahydro-L-biopterin, very probably via an intramolecular rearrangement.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19920750423
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  • 10
    Electronic Resource
    Electronic Resource
    Absolute Configuration of 3-Substituted 1-Azabicyclo[2.2.1]heptanesDedicated to Professor Dr. Vladimir Prelog on the occasion of his 85th birthday (1992)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 75 (1992), S. 507-512 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The l-azabicyclo[2.2.1]heptan-3-exo-ol (2) was resolved by fractional crystallisation of its hydrogen tartrate salts. The enantiomers (+)- and (-)-2 were oxidised to the ketones (-)-4 and (+)-4, respectively (Scheme). CD spectroscopy suggested that (-)-4 possesses the (1R,4S)-configuration. This absolute configuration was confirmed by single-crystal X-ray diffraction of the derivative (+)-(1R,4R)-3-(1,3-dithian-2-ylidene)-1-azabicyclo [2.2.1]-heptane ((+)-5).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19920750210
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