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  • 1
    Electronic Resource
    Electronic Resource
    A raman and x-ray diffraction study of the thermal cis-trans isomerization in polyacetylene (1983)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 4 (1983), S. 403-409 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1983.030040610
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  • 2
    Electronic Resource
    Electronic Resource
    The thermal oxidative degradation of an ethylene-tetrafluoroethylene-copolymer-based electrical wire insulation (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 601-611 
    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 multidisciplinary spectroscopic evaluation of a commercial wire insulation based on a cross-linked copolymer of ethylene and tetrafluoroethylene (X-ETFE) was conducted to determine the chemical changes taking place during thermal aging. These studies provided insight into the roles of the various additives, such as triallylisocyanurate (TAIC) and antimony oxide, in the formulated X-ETFE insulation. During irradiation processing, a large fraction of the TAIC is converted to a cross-linked isocyanurate moiety; the unconverted TAIC is released during aging. Thermal aging of the X-ETFE wire insulations was performed in air at 200°C for up to 5 months and resulted in oxidation of the base ETFE, loss of unreacted TAIC, and a small amount of dehydrofluorination. The antimony oxide serves the multiple roles of flame retardant and scavenger for the pyrolytically generated hydrogen fluoride.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070430322
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  • 3
    Electronic Resource
    Electronic Resource
    Structure-Activity relationship of tetrapeptides related to dermorphin: A 500-MHz 1H-nmr study (1988)
    New York : Wiley-Blackwell
    Biopolymers 27 (1988), S. 1353-1361 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several tetrapeptide analogs of dermorphin have been studied by means of 1H-nmr spectroscopy at 500 MHz in DMSO-d6. In spite of the unfavorable properties of the solvent, it is possible to extract key structural information that, combined with the biological activity of the peptides, yields a structure-activity relationship that is consistent with our model of the μ receptor site. In particular, the importance of the orientation of the aromatic ring of the third residue, hypothesized in the theoretical model, is now substantiated. The shape of the P subsite of the receptor is also indirectly defined by the shape of several bulky side chains of the third residue.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360270903
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  • 4
    Electronic Resource
    Electronic Resource
    Nmr studies of a series of dehydrodermorphins (1989)
    New York : Wiley-Blackwell
    Biopolymers 28 (1989), S. 129-138 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The third and fifth aromatic residues of dermorphin, a potent μ-opioid peptide, and of its N-terminal fragments, from the pentapeptide to the parent heptapeptide amide, have been systematically substituted with Z-dehydrophenylalanine (Δ-Phe) and/or Phe to investigate the conformation-activity relationship.The characterization in DMSO-d6 at 500 MHz indicates that, in this solvent, all peptides adopt essentially random, extended conformations, as a consequence of the strong solvation. The chemical shift of the methyl group of D-Ala is influenced by the precise orientation of the side chain of the third residue in a fashion that can be correlated to the μ potency, consistently with our model of μ-receptor.However, the complexes of the pentapeptides with 18-crown-6-ether, when dissolved in chloroform, adopt ordered, folded conformations, a behavior that closely parallels the CD observations in methanol.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360280115
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  • 5
    Electronic Resource
    Electronic Resource
    Design of metal ion binding peptides (1995)
    New York : Wiley-Blackwell
    Biopolymers 37 (1995), S. 401-410 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two cyclic and branched peptides (PLA and AZU) were synthesized with the aim of reproducing the active site of the blue copper proteins plastocyanin and azurin. Both peptides, designed on the basis of the x-ray structures of Poplar plastocyanin and Alcaligenes denitrificans azurin. contain the same coordinating residues of the parent native proteins. The visible spectra of PLA in the presence of equimolar amount of Cu(II) strongly support the interaction between the peptide and copper(II) ion. The CD titration of AZU with the Hg(II) ion indicates for the formation of two species. [A ZUHg]+ and [A ZUHg2]3+ having binding constants (Keq) of 3.106 and 2-104M-1, respectively. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360370607
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  • 6
    Electronic Resource
    Electronic Resource
    Bioactive conformation of linear peptides in solution: An elusive goal? (1989)
    New York : Wiley-Blackwell
    Biopolymers 28 (1989), S. 91-107 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bioactive peptides of natural origin have, in general, short linear sequences, and are characterized by a large conformational flexibility. It is very difficult to study their conformation in solution since they exist, almost invariably, as a complex mixture of numerous conformers, most of which are extended. The so-called bioactive conformation may be one of them, although the solvents used in solution studies often have properties drastically different from those of the biological system in which the peptide acts. There is, however, no simple way of identifying the bioactive conformation amid the many existing conformers.It is possible to approach a solution to this problem using two distinct strategies: (a) Limiting the conformational freedom of the peptide, e.g., by increasing the viscosity of the solution and decreasing the temperature, in the assumption that the bioactive conformation is, even slightly, more stable than the others. (b) Trying to mimic in solution the physicochemical features of the more reliable receptor models.These two approaches will be illustrated with examples taken mainly from oploid peptides.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360280112
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and conformation of regularly alternating L,D linear peptides (1983)
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 323-325 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360220141
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  • 8
    Electronic Resource
    Electronic Resource
    Cathodic stripping voltammetric determination of metallothioneins (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 396-398 
    Details
    ISSN: 1040-0397
    Keywords: Metallothioneins ; Cathodic stripping voltammetry ; Metal-binding proteins ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A cathodic stripping voltammetric method for the determination of metallothioneins (MT) is proposed. The procedure is based on the controlled adsorption of the protein on the mercury electrode after addition of an excess of CuII to the solution. The effects of accumulation time, adsorption potential and copper concentration have been examined and the analytical procedure has been optimized. Using an accumulation time of 300 s, a MT concentration of 0.2 nM can be detected.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140080418
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  • 9
    Electronic Resource
    Electronic Resource
    Polylysine induces changes in membrane electrical properties of K562 cells (1997)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 35 (1997), S. 165-174 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The ionic environment of the cell membrane is of extreme importance in maintaining cell integrity and the numerous functions necessary for cell growth, differentiation, etc., as well as in cell-biomaterial interactions. In this study, the effects of polylysine (a basic poly-amino acid with a net positive charge which is often used to coat biomaterials surfaces) on the erythroleukemic K562 cell membrane were investigated. In particular, the effects of this polycation were evaluated using dielectric relaxation studies in the radiofrequency range with which it is possible to measure both active ionic transport across the cell membrane (membrane conductivity) and the static charge distribution present on the cell surface due to the structural components of the cell membrane (membrane permittivity). The conductivity of the cytosol can also be determined. The results demonstrate that while the conductivity of the cytosol is not significantly altered, both the conductivity and permittivity of the K562 cell membrane are varied by exposure of these cells to polylysine. These observations indicate that both active ionic transport and the type, quantity, or distribution of membrane components such as lipids, proteins, and polysaccharides may also be altered. Although the precise mechanisms by which these variations in K562 cells occur are unknown, it can be hypothesized that changes in the growth characteristics of these cells may be in part responsible. In particular, as demonstrated by light microscopic examination of K562 cells directly in the culture flasks, the cells in polylysinecoated flasks do not grow in suspension as do the controls, but rather show anchorage-dependent-like behavior. It is this important change from suspension to monolayer growth induced by polylysine that may be responsible for the changes in membrane electrical parameters. © 1997 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Polymerization by crystallization of molten trioxane suspended in inert media, in presence of ethylenoxideDedicated to Prof. Dr. W. KERN on the occasion of his 60th birthday (1966)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 93 (1966), S. 137-144 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Methode, Trioxan, während es aus einer abkühlenden Lösung auskristallisiert, zu polymerisieren, wird auf die Copolymerisation von geschmolzenem Trioxan mit Äthylenoxid mittels BF3-Ätherat in Suspension in mit Polyisobutylen verdicktem Mineralöl übertragen. Mit ca. 4·10-5 Mol Initiator/Mol Trioxan entstehen Copolymere mit überwiegender Polyoxymethylen-Struktur in 45 bis 60% Ausbeute, welche sich durch hohe Molekulargewichte (ηinh = 1,5 bei 60°C in 0,5-proz. Lösung in p-Chlorphenol) und durch hohe thermische Stabilität (Gewichtsverlust bei 220°C unter Stickstoff = 0, 03%/Min.) auszeichnen.
    Notes: The method of polymerization of trioxane solutions during crystallization by cooling is extended to molten trioxane in presence of ethylenoxide, suspended in mineral oil (thickened with polyisobutylene) and activated with small quantities of BF3·Et2O. Operating with quantities of catalyst in the order of 4.0/10-5 moles/mole of trioxane, copolymers with prevailing polyxymethylene structure are obtained, characterized by high molecular weight (ηinh = 1.5 in 0.5% solution in p-chlorophenol at 60°C.) and good thermal stability (k220 = 0.03%/min.), with yields of 45 to 60%.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1966.020930109
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