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  • 1
    Electronic Resource
    Electronic Resource
    Dilute solution properties of polyurethane (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 597-599 
    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: Mittels Kleinwinkel-Laserlichtsreuung und viskosimetrichen Messungen wurden verdünnte Lösungen von Polyurethanfraktionen untersucht. Das Polymer wurde aus Butandiol und Hexamethylendiisocyanat hergestellt. Die Grenzviskositäten wurden über die MARK-HOUWINK-SAKURADA-Gleichung zu den Molekülmassen korreliert. Die Werte der Konstanten Km und a wurden ermittelt. Trotz des niedrigen Brechungsinkrementes von Polyurethan in Benzen konnten Molekülmassen bis herab zu 4300 gemessen werden.
    Notes: Low angle laser light scattering and viscosity studies were made on dilute solution of fractions of polyurethane prepared from butandiol and hexamethylene diisocyanate. The intrinsic viscosities were correlated to molecular weights by the MARK-HOUWINK-SAKURADA equation. The values of the constants Km and a have been determined. In spite of the low refractive index increment of polyurethane in benzene, molecular weights as low as 4300 could be measured.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010421114
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  • 2
    Electronic Resource
    Electronic Resource
    Preliminary studies on ion chromatography/fast-atom bombardment mass spectrometry for the characterization of various ionic compounds (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 405-409 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: An ion chromatography/mass spectrometry system which makes use of a continuous-flow fast-atom bombardment probe, has been constructed and evaluated. Examples are given of applications to the analysis of inorganic anions (ion-exchange chromatography), water soluble vitamins (ion-pair chromatography) and glucose derivatives (ion-excluson chromatography).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290031108
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetics of the inhibition of acetylcholinesterase from pigeon brain by procaine hydrochloride (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 12 (1994), S. 209-216 
    Details
    ISSN: 0263-6484
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The kinetic parameters of the inhibition of pigeon brain acetylchlolinesterase (AChE) by procaine hydrochloride were investigated. Procaine (0·083-1·67 mM) reversibly inhibited AChE activity (15-83 percent) in a concentration dependent manner, the IC50 being about 0·38 mM. The Michaelis-Menten constant (Km) for the hydrolysis of acetylthiocholine iodide was found to be 1·53 × 10-4 M and the Vmax was 1·06 μmol min-1 mg-1 protein. Dixon as well as Lineweaver-Burk plots and their secondary replots indicated that the nature of the inhibition is of the linear mixed type which is considered to be a mixture of partial competitive and pure non-competitive. The values of Ki(slope) and Ki (intercepts) were estimated as 0·14 mM and 0·22 mM respectively by the primary Dixon and by the secondary replots of the Lineweaver-Burk plot. The Ki′/Ki ratio shows that procaine has a greater affinity of binding for the peripheral than for the active site.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290120309
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  • 4
    Electronic Resource
    Electronic Resource
    Lichtinitiierte Polymer- und Polymerisationsreaktionen. 45. Mitt.: Effizienzvergleich zwischen monomeren und telechelen Photoinitiatoren mit Alkoxythiocarbonylsulfidgruppen44. Mitteilung: Timpe, H.-J., und Strehmel, B.: Makromol. Chemie, zur Publikation eingereicht (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 243-244 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420515
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  • 5
    Electronic Resource
    Electronic Resource
    Physical studies of ionically-terminated polytetrahydrofuran polymers. I. Dilute solution behavior (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 1503-1510 
    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 series of tetrahydrofuran polymers, terminating at one end with a pyridinium bromide group, were prepared; their hydrodynamic behavior contrasted with the equivalent methoxyterminated polytetrahydrofurans. This article reports viscometry studies of these polytetrahydrofurans in cyclohexane, toluene, tetrahydrofuran, methyl ethyl ketone, and cyclohexanone.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070430812
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  • 6
    Electronic Resource
    Electronic Resource
    γ Radiolysis of cellulose acetate (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 2893-2897 
    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 major degradative process in γ-irradiated cellulose acetate is chain scission. For the dry powder the Gs value (number of scissions per 100 eV of energy absorbed) was found to be 7.1. The water-swollen material was found to degrade at the higher rate of Gs = 9.45. Additions of ethanol and methanol to the water brought about reductions in Gs, whereas dissolved nitrous oxide produced an increase in Gs. The useful life of cellulose acetate reverse osmosis membranes exposed to γ radiation was estimated by observations of the water permeation rate during irradiation. Membrane breakdown occurred at 15 Mrad in pure water, but the dose to breakdown was extended to 83 Mrad in the presence of 4% methanol.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070231006
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  • 7
    Electronic Resource
    Electronic Resource
    Mechanisms of antioxidant action: Tellurium dithiocarbamates as antioxidants for polypropylene (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 4857-4864 
    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 tetrakis (dialkyldithiocarbamato)tellurium(IV) complexes are highly effective thermal antioxidants and melt stabilizers for polypropylene and the evidence suggests that they are converted to the bis(dialkyldithiocarbamato)tellurium(II) complexes and the corresponding dithiocarbamoyl disulfides during processing. The Te(IV) complexes are also effective photoantioxidants and their activity increases with increasing processing time. The bischelates are in general less effective when used alone.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070320508
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  • 8
    Electronic Resource
    Electronic Resource
    Morphology of nylon 6 spherulites in bulk (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 1195-1204 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A method of obtaining good quality ultrathin sections from nylon 6 bulk samples has been developed by using a special embedding technique and cryo-ultramicrotomy. The morphologies of nylon 6 processed by compression and injection molding and of reaction injection molded nylon 6 were studied in ultrathin sections of bulk samples by means of transmission electron microscopy. It was established that the spherulites of nylon 6 in bulk are built up from long flat ribbonlike lamellae. The thickness of the lamellae is in the range 50-60 Å. The width varies from 150 to 600 Å and depends on the type of nylon 6 and the method of processing. The length of the lamellae is relatively large approaching spherulite radii, extending often from the point of their origin up to the spherulite borders. Three or four neighboring lamellae within spherulites usually show similar orientation of their flat faces and form domains which can easily be mistaken for fibrils in light microscopy or low resolution electron microscopy.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880522
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on the behaviour of cuprous chloride in hydrochloric acid and potassium chloride solutions. I. Chemical analysis in the aqueous phase (1959)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 299 (1959), S. 322-327 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es werden die Ergebnisse von Untersuchungen über die Komplexbildung zwischen CuCl und HCl bzw. KCl in Lösung und im Bodenkörper mitgeteilt. Zur Konzentrationsbestimmung der Komponenten im Bodenkörper wird eine indirekte Methode benutzt. Im System CuCl—HCl liegen in Lösung die Komplexe H2CuCl3 und H3CuCl4 vor, analoge Komplexe finden sich in Lösung im System CuCl—KCl, während im Bodenkörper KCuCl2 und K2CuCl2 vorliegen.
    Notes: Investigations have been carried out to determine the complex ion formation between cuprous chloride and hydrochloric acid and cuprous chloride and potassium chloride in the aqueous and solid phase. An indirect method to determine the concentration of the components in the solid phase was employed due to the highly oxidisable nature of cuprous ions. Rectangular curves were drawn. In the case of hydrochloric acid, complexes like H2CuCl3 and H3CuCl4 are formed in the liquid phase while H2CuCl3; H3CuCl4 are formed in the solid phase. For potassium chloride, complexes like K3CuCl4 and K2CuCl3 were found to exist in the aqueous phase and KCuCl2 and K2CuCl3 were obtained in the solid phase. The amount of cuprous chloride going into solution with increasing amount of KCl was found to be lesser for HCl under identical conditions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19592990510
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  • 10
    Electronic Resource
    Electronic Resource
    Mass spectral studies on steroidal compounds. 11. [4,6-cd]-pyrazoles in the cholestane and stigmastane series (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1987), S. 796-798 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    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/oms.1210221207
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