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  • Polymer and Materials Science  (3)
  • STAT1 Transcription Factor  (3)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
  • 1995-1999  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Dielectric investigations on novolac phenol-formaldehyde resin (1995)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 46 (1995), S. 64-67 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Permittivity ∊′ and dielectric loss ∊″ of novolac have been determined in the temperature interval from  - 150 to 150°C and in the frequency interval from 102.5 to 106 Hz. Novolac exhibits a main and a secondary relaxation process. For the main relaxation a master curve of ∊″ was calculated, the shape of which was described by the Havriliak - Negami function (HN). The parameters of the HN fit were interpreted by a model that relates the values to the polymer structure. Furthermore, the temperature dependence of the dielectric relaxation times was analyzed by a WLF approach for the main relaxation and an Arrhenius approach for the secondary relaxation. The dielectric relaxation times of the main relaxation were correlated with the electrical conductivity and the melt viscosity.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1995.010460109
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructural characterisation of nanocrystalline GaN prepared by detonations of gallium azides (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 8 (1998), S. 135-146 
    Details
    ISSN: 1057-9257
    Keywords: gallium nitride ; nanocrystallites ; detonation ; gallium azide ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: High quality nanoscale, phase-pure hexagonal gallium nitride (GaN) crystallites have been synthesized by the thermal induced detonation of molecular precursors of the type (R3N)Ga(N3)3 (R=CH3, C2H5, etc.). The method allows the control of the particle size regime from 2 to about 1000 nm. X-ray diffraction and Rietveld simulations revealed an anisotropic platelet-like shape of the particles. The obtained GaN material was as well characterized by transmission electron microscopy and electron diffraction, photoluminescence spectroscopy, SEM, IR, RAMAN, thermal gas effusion/mass spectrometry, thermal analysis, elemental analysis. Gas absorption measurements (BET method) showed a specific surface area of about 90 m2 · g-1. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Role of cyclic plastic deformation in the wear of UHMWPE acetabular cups (1995)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 619-626 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The mechanisms of wear in ultra-high-molecular-weight polyethylene (UHMWPE) acetabular cups were investigated on both laboratory simulator-tested cups and a clinically retrieved component. Two different levels of wear process were identified: one characterized by the formation and detachment of platelet-like flakes from initial machining marks, and the other by the formation of fine ripples and fibrils by repeated passes of microscopic asperities on the femoral head. Both wear processes could be described by a criterion of critical plastic strain. A theoretical model was developed to account for the generation of the microscopic wear particles based on such a critical strain criterion. Its predictions of the dependence of the UHMWPE wear rate on surface roughness and applied load were in excellent agreement with previously published experimental correlations. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820290509
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  • 4
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    Defective TNF-alpha-induced apoptosis in STAT1-null cells due to low constitutive levels of caspases (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-12-31
    Description: Signal transducers and activators of transcription (STATs) enhance transcription of specific genes in response to cytokines and growth factors. STAT1 is also required for efficient constitutive expression of the caspases Ice, Cpp32, and Ich-1 in human fibroblasts. As a consequence, STAT1-null cells are resistant to apoptosis by tumor necrosis factor alpha (TNF-alpha). Reintroduction of STAT1alpha restored both TNF-alpha-induced apoptosis and the expression of Ice, Cpp32, and Ich-1. Variant STAT1 proteins carrying point mutations that inactivate domains required for STAT dimer formation nevertheless restored protease expression and sensitivity to apoptosis, indicating that the functions of STAT1 required for these activities are different from those that mediate induced gene expression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kumar, A -- Commane, M -- Flickinger, T W -- Horvath, C M -- Stark, G R -- P01 CA62220/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1997 Nov 28;278(5343):1630-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Lerner Research Institute, The Cleveland Clinic Foundation, Cleveland, OH 44195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9374464" target="_blank"〉PubMed〈/a〉
    Keywords: *Apoptosis ; Caspase 1 ; Caspase 2 ; Caspase 3 ; *Caspases ; Cell Line ; Cysteine Endopeptidases/genetics/*metabolism ; DNA-Binding Proteins/chemistry/genetics/*metabolism ; Dactinomycin/pharmacology ; Dimerization ; Gene Expression Regulation, Enzymologic ; Humans ; Interferon-gamma/pharmacology ; Phosphorylation ; Point Mutation ; Proteins/genetics/*metabolism ; STAT1 Transcription Factor ; Signal Transduction ; Trans-Activators/chemistry/genetics/*metabolism ; Transfection ; Tumor Necrosis Factor-alpha/*pharmacology
    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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  • 5
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    STATs find that hanging together can be stimulating (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-08-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Leung, S -- Li, X -- Stark, G R -- New York, N.Y. -- Science. 1996 Aug 9;273(5276):750-1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Research Institute, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8701326" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD/metabolism ; Cytokines/*metabolism ; DNA-Binding Proteins/chemistry/metabolism ; Humans ; Interferon-alpha/metabolism ; Interferon-gamma/metabolism ; Phosphorylation ; Receptor, Interferon alpha-beta ; Receptors, Interferon/metabolism ; STAT1 Transcription Factor ; STAT4 Transcription Factor ; *Signal Transduction ; Trans-Activators/chemistry/*metabolism ; Transcription Factors/metabolism ; *Transcriptional Activation ; src Homology Domains
    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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  • 6
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    Contribution of STAT SH2 groups to specific interferon signaling by the Jak-STAT pathway (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-03-03
    Description: In response to specific ligands, various STAT proteins (signal transducers and activators of transcription) are phosphorylated on tyrosine by Jak protein kinases and translocated to the nucleus to direct gene transcription. Selection of a STAT at the interferon gamma receptor as well as specific STAT dimer formation depended on the presence of particular SH2 groups (phosphotyrosine-binding domains), whereas the amino acid sequence surrounding the phosphorylated tyrosine on the STAT could vary. Thus, SH2 groups in STAT proteins may play crucial roles in specificity at the receptor kinase complex and in subsequent dimerization, whereas the kinases are relatively nonspecific.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heim, M H -- Kerr, I M -- Stark, G R -- Darnell, J E Jr -- AI32489/AI/NIAID NIH HHS/ -- AI34420/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1995 Mar 3;267(5202):1347-9.〈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/7871432" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; DNA-Binding Proteins/chemistry/*metabolism ; Interferon-alpha/*pharmacology ; Interferon-gamma/*pharmacology ; Janus Kinase 1 ; Janus Kinase 2 ; Phosphorylation ; Protein-Tyrosine Kinases/*metabolism ; Proteins/metabolism ; *Proto-Oncogene Proteins ; Receptors, Interferon/metabolism ; Recombinant Fusion Proteins/metabolism ; STAT1 Transcription Factor ; Signal Transduction ; Trans-Activators/chemistry/*metabolism ; Tyrosine/metabolism
    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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