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  • 1
    Electronic Resource
    Electronic Resource
    Internal stresses, dimensional instabilities arid molecular orientations in plastics. Von L. C. E. STRUIK. ISBN 0-471-92642-6. Chichester/New York/Brisbane/Toronto/Singapore: .John Wiley & Sons, 1990. XVII, 453 S., geb., £ 45.00. (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 136-136 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420225
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  • 2
    Electronic Resource
    Electronic Resource
    Infrared spectroscopic study of field-induced band shifts and dipole orientation in poly(vinylidene fluoride) (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 1-7 
    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: Uniaxial gereckte, in der ß-Modifikation vorliegende PVDF-Filme wurden bei anliegendem elektrischen Feld infrarotspektroskopisch untersucht. In bis zu 13 Feldstärkecyclen wurden dabei sowohl die Feldstärke als auch die Richtung des anliegenden Feldes variiert. Die feldinduzierten Frequenzänderungen der Banden bei 445 cm-1 (CF2-rocking) und 510 cm-1 (CF2-bending) wurden detailliert registriert. Modellrechnungen zum Einfluß des Feldes auf die Schwingungsfrequenzen demonstrieren die Möglichkeit, mit Hilfe der Infrarotspektroskopie zwischen entgegengesetzten Dipolrichtungen zu unterscheiden. Die experimentellen Ergebnisse deuten auf die Existenz eines remanenten Feldes in der Probe infolge der Einwirkung des äßeren Feldes hin.
    Notes: Infrared spectra of uniaxially drawn ß-PVDF films under the influence of an electric field were registered. The direction and the strength of the applied field were changed in up to 13 cycles. The field-induced frequency changes of the bands at 445 cm-1 (CF2-rocking) and 510 cm-1 (CF2-bending) were studied in detail. Model calculations concerning the influence of the field on band frequencies are presented revealing the possibility to discriminate by IR spectroscopy between opposite dipole directions. The experimental results suggest the formation of a remanent field in the samples during poling.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430101
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared spectroscopic investigations of unpoled poly(vinylidene fluoride) films in an electric field (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 319-322 
    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: In Poly(vinylidenfluorid) (PVDF) kann die Dipoldrehung im elektrischen Feld anhand der Absorptionsänderung der Infrarotbanden bei 445 cm-1 und 510 cm-1 verfolgt werden. Anknüpfend an vorhergehende Untersuchungen wurde an PVDF-Folien mit aufgedampften infrarotdurchlässigen Elektroden ein stufenweise erhöhtes Feld angelegt und das Infrarotspektrum aufgenommen. In Anlehnung an das früher entwickelte Modell wurden die normierten Absorptionen der beiden Banden gegeneinander aufgetragen, wobei sich eine Abweichung vom erwarteten linearen Zusammenhang in der Feldabhängigkeit der Absorption beider Banden zeigte. Interpretiert wird diese Abweichung mit der feldinduzierten Zunahme des Anteils langer Trans-Sequenzen.
    Notes: In poly(vinylidene fluoride) (PVDF) the rotation of the dipoles in an electric field can be followed by the change of the infrared absorption bands at 445 cm-1 and 510 cm-1. Referring to preceding measurements on PVDF foils with evaporated infrared transparent electrodes a stepwise increased field was applied. Following the formerly developed model, the normalized absorptions of both bands were plotted one against the other. A deviation from the expected linear relation in the field dependence of both absorption bands was found. This behaviour is interpreted by an increase of the amount of long trans sequences.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420707
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  • 4
    Electronic Resource
    Electronic Resource
    Zum einfluß von düsenverzug und plastischer reckung auf die eigenschaften von naßgesponnenen polyoxadiazolfäden (1992)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 43 (1992), S. 159-164 
    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 aromatic heterocyclic polymer polyoxadiazole is of interest for special applications because of its high thermal stability. Using a laboratory equipment the spinning parameters jet draw rate and plastic drawing have been varied. The effect of spinning conditions on the material parameters elongation at break, tenacity and modulus was investigated. To achieve higher values of tenacity and modulus, a jet draw rate of 2 and plastic drawing ratio of 1.5 to 2.0 were found to be optimal. Also the increase of fibre length at stress-free heating has been studied. With varying jet draw rate and plastic drawing ratio both positive and negative changes of fibre length have been observed. The results are explained by superposition of spontaneous extension and shrinkage.
    Notes: Polyoxadiazol, ein aromatisches heterocyclisches Polymer, ist aufgrund seiner hohen thermischen Stabilität für eine Reihe von Einsatzzwecken interessant. Mit einer Laborspinnanlage wurden die Spinnbedingungen Düsenverzug und Grad der plastischen Reckung variiert und deren Einfluß auf die Materialparameter wie Bruchdehnung, Festigkeit und Modul untersucht. Zur Erreichung höherer Festigkeiten und Moduli erwiesen sich ein mittlerer Düsenverzug von 2 und ein eher niedriger plastischer Reckgrad von 1,5 bis 2 als günstig. Ebenfalls untersucht wurde die Längenzunahme der Fäden bei lastfreier Temperung. Je nach Düsenverzug und plastischem Reckgrad wurden sowohl positive als auch negative Längenänderungen gefunden, die mit der überlagerung von spontaner Dehnung und Schrumpf erklärt werden.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1992.010430306
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  • 5
    Electronic Resource
    Electronic Resource
    Direct observation of cell wall glucans in whole cells of Saccharomyces cerevisiae by magic-angle spinning 13C-nmr (1994)
    New York : Wiley-Blackwell
    Biopolymers 34 (1994), S. 1627-1635 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Intact cells of Saccharomyces cerevisiae were examined as an aqueous paste by 13C-nmr spectroscopy with direct polarization and magic-angle spinning. The spectra obtained were highly resolved, showing numerous resonances in the 60-105 ppm range that were assigned to carbons of a liquid-like domain of the cell wall glucan. Assignments were confirmed by running the spectrum of S. cerevisiae in which the cell wall glucans were labeled with [13C] by feeding the cell [13C ] galactose. The spectra indicate that the glucan in the cell wall of intact S. cerevisiae assumes a helical conformation and suggest that strain 17A fed with galactose preferentially incorporates the resulting glucose into β(1 → 3)-linkages. © 1994 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360341207
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  • 6
    Electronic Resource
    Electronic Resource
    The Phenomenological theory of linear viscoelastic behavior. An introduction. Von NICHOLAS W. TSCHOEGL. ISBN 3-540-19173-9. Berlin/Heidelbere/New York/London/Paris/Tokyo/Hong Kong: Springer-Verlag 1989. XXV, 769 S., geb., DM 148,00. (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 425-425 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410711
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  • 7
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    Jak-STAT pathways and transcriptional activation in response to IFNs and other extracellular signaling proteins (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-06-03
    Description: Through the study of transcriptional activation in response to interferon alpha (IFN-alpha) and interferon gamma (IFN-gamma), a previously unrecognized direct signal transduction pathway to the nucleus has been uncovered: IFN-receptor interaction at the cell surface leads to the activation of kinases of the Jak family that then phosphorylate substrate proteins called STATs (signal transducers and activators of transcription). The phosphorylated STAT proteins move to the nucleus, bind specific DNA elements, and direct transcription. Recognition of the molecules involved in the IFN-alpha and IFN-gamma pathway has led to discoveries that a number of STAT family members exist and that other polypeptide ligands also use the Jak-STAT molecules in signal transduction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Darnell, J E Jr -- Kerr, I M -- Stark, G R -- New York, N.Y. -- Science. 1994 Jun 3;264(5164):1415-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Cell Biology, Rockefeller University, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8197455" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Cell Line ; DNA-Binding Proteins/*metabolism ; Genes ; Genetic Complementation Test ; Humans ; Interferon-Stimulated Gene Factor 3 ; Interferon-Stimulated Gene Factor 3, gamma Subunit ; Interferon-alpha/*pharmacology ; Interferon-gamma/*pharmacology ; Molecular Sequence Data ; Mutation ; Protein-Tyrosine Kinases/metabolism ; Regulatory Sequences, Nucleic Acid ; *Signal Transduction ; Transcription Factors/*metabolism ; *Transcriptional Activation
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    A single phosphotyrosine residue of Stat91 required for gene activation by interferon-gamma (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-09-24
    Description: Interferon-gamma (IFN-gamma) stimulates transcription of specific genes by inducing tyrosine phosphorylation of a 91-kilodalton cytoplasmic protein (termed STAT for signal transducer and activator of transcription). Stat91 was phosphorylated on a single site (Tyr701), and phosphorylation of this site was required for nuclear translocation, DNA binding, and gene activation. Stat84, a differentially spliced product of the same gene that lacks the 38 carboxyl-terminal amino acids of Stat91, did not activate transcription, although it was phosphorylated and translocated to the nucleus and bound DNA. Thus, Stat91 mediates activation of transcription in response to IFN-gamma.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shuai, K -- Stark, G R -- Kerr, I M -- Darnell, J E Jr -- AI32489-02/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1993 Sep 24;261(5129):1744-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Rockefeller University, Laboratory of Molecular Cell Biology, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7690989" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Cell Line ; Cell Nucleus/metabolism ; DNA-Binding Proteins/chemistry/*metabolism ; *Gene Expression Regulation ; Humans ; Interferon-gamma/*pharmacology ; Molecular Sequence Data ; Peptide Fragments/chemistry/metabolism ; Phosphotyrosine ; *Signal Transduction ; Transcription Factors/chemistry/*metabolism ; Transcriptional Activation ; Transfection ; Tyrosine/analogs & derivatives/chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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