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  • 1995-1999  (6)
  • Chemistry  (3)
  • 85.25.Cp  (2)
  • Aneurysm  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Loss and apoptosis of smooth muscle cells in intracranial aneurysms studies with in situ DNA end labeling and antibody against single-stranded DNA (1997)
    Springer
    Acta neurochirurgica 139 (1997), S. 469-475 
    Details
    ISSN: 0942-0940
    Keywords: Aneurysm ; anti-single-stranded DNA antibody ; apoptosis ; DNA fragmentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Pathological specimens were collected from 14 unruptured and 13 ruptured aneurysms at the time of clipping and studied in order to assess the underlying mechanism of rupture by investigating degeneration of the aneurysmal wall and possible involvement of apoptosis. Immunohistochemistry with anti-actin antibody showed few smooth muscle cells in the ruptured aneurysms and replacement of the muscularis layer by a fibro-hyalin tissue. However, at least one layer of smooth muscle cells was clearly observed in the unruptured aneurysms. Thus, smooth muscle cells in the wall of the ruptured aneurysms were much more degenerated than those in the wall of unruptured aneurysms. In addition, unruptured aneurysms with an angiographically smooth wall showed well-layered positive staining for anti-smooth muscle actin antibody while those with irregular shapes rarely reacted. We found, for the first time, evidence of DNA fragmentation in the aneurysmal wall. Apoptotic bodies were detected by means of a terminal transferase (TdT)-mediated dUTP biotin nick end labelling technique (TUNEL) and an anti-single-stranded DNA antibody in 54% (7/13) of the ruptured aneurysms. In contrast, apoptotic bodies were found in only 7% (1/14) of the unruptured cases. These results suggest that apoptotic cell death might be involved in the rupture of aneurysms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01808885
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum: Experimental evidence for Coulomb charging effects in submicron Bi-2212 stacks [JETP Lett. 69, No. 1 84–90 (10 January 1999)] (1999)
    Springer
    JETP letters 69 (1999), S. 640-643 
    Details
    ISSN: 1090-6487
    Keywords: 85.25.Cp ; 74.50.+r ; 99.10.+g
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567973
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental evidence for Coulomb charging effects in submicron Bi-2212 stacks (1999)
    Springer
    JETP letters 69 (1999), S. 84-90 
    Details
    ISSN: 1090-6487
    Keywords: 85.25.Cp ; 74.50.+r
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Focused ion beam (FIB) and ion milling techniques are developed for the fabrication of Bi2Sr2CaCu2O8+1d (Bi-2212) stacked junctions with in-plane size L ab ranging from several microns down to the submicron scale without degradation of superconducting transition temperature T c. It is found that the behavior of submicron junctions (L ab〈1 µm) is quite different from that of larger ones. The critical current density is considerably suppressed, the hysteresis and multibranched structure of the current-voltage (I-V) characteristics are eliminated, and a periodic structure of current peaks appears reproducibly on the I-V curves at low temperatures. The period ΔV of the structure is consistent with the Coulomb charging energy of a single pair, ΔV=e/C, where C is the effective capacitance of the stack. It is considered that this behavior originates from the Coulomb blockade of the intrinsic Josephson tunneling in submicron Bi-2212 stacks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567988
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  • 4
    Electronic Resource
    Electronic Resource
    Production of micron-sized monodispersed polymer particles by seeded polymerization for the dispersion of highly monomer-swollen particles prepared with submicron-sized polymer seed particles utilizing the dynamic swelling method (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 2513-2519 
    Details
    ISSN: 0887-624X
    Keywords: dynamic swelling method ; particle ; monodisperse ; micron-size ; seeded polymerization ; emulsion polymerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: For the purpose of extending the size range of polymer seed particles used in “dynamic swelling method” (DSM), first it was verified theoretically that the submicron-sized polymer particles produced by emulsion polymerization can also absorb a large amount of monomer by DSM in both equilibrium and kinetic control states. Next, on the basis of the theoretical results, experimentally about 2.6 μm-sized styrene-swollen polystyrene (PS) particles were prepared utilizing DSM in the presence of 0.64 μm-sized monodispersed PS seed particles produced by emulsifier-free emulsion polymerization. Moreover, 2.5 μm-sized monodispersed PS particles were produced by the addition of cupric chloride as a water-soluble inhibitor to depress the by-production of submicron-sized PS particles in the seeded polymerization at 30°C with 2,2′-azobis(4-methoxy-2,4-dimethylvaleronitrile) initiator. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2513-2519, 1998
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamics of high swelling of polymer particles with a large amount of monomer utilizing the dynamic swelling method (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 60 (1996), S. 1025-1031 
    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: Recently, we suggested a novel swelling method to make polymer seed particles absorb a large amount of monomer prior to the seeded polymerization for preparing monodispersed polymer particles having diameter above 5μm, which we named the “dynamic swelling method.” This article discusses the thermodynamic background of this method, both theo-retically and experimentally. © 1996 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of a photosensitive polyimide containing a diazo group and its photocrosslinking reactions via a long-lived active intermediate (1995)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 46 (1995), S. 407-415 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A novel intrinsic photosensitive polyimide containing a diazo group in the main chain was prepared, and the quantum yield for the photocrosslinking reaction was determined to be 0.13 under air at room temperature by GPC measurement. The quantum yield for the photo-decomposition reaction of the diazo group was also determined to be 0.06. These values are higher by about two orders of magnitude than those for the photocrosslinking reaction of a benzophenone-containing polyimide, which is prepared from benzophenonetetracarboxylic dianhydride (BTDA) and methylene bis(2-ethylaniline) (DEDPM). The reaction was found to proceed via its singlet excited state to give a long-lived active intermediate, a carbene, which plays a great role in the increase in the photoreactivity. Characteristics of the photoreaction and the fluorescence behavior of a series of imide-substituted diphenyldiazomethanes were also investigated, showing that the reactivity of the diazo groups is not affected by the existence of charge transfer structures of the imide groups.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1995.010460601
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    Paper (German National Licenses)
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