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  • 1990-1994  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Purification of arginine-sensitive hemagglutinin from Fusobacterium nucleatum and its role in coaggregation (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 28 (1993), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Hemagglutinin of Fusobacterium nucleatum was extracted from Triton X-100-pronase P-treated cell envelopes, and was purified by affinity chromatography on L-arginine agarose. The hemagglutinin was inactivated by heating at 70°C for 1 min. The activity was inhibited by L-arginine but was not affected by any sugars or by EDTA. The hemagglutinin aggreggated 14 out of 17 strains of oral streptococci tested, and the bacterial aggregating activity was also inhibited by L-arginine. The results indicate the dominant role of this hemagglutinin in the adherence of this bacterium both to host cells and to other bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1993.tb01046.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and properties of mesophase pitch carbon fibre with a skin-core structure carbonized under strain (1992)
    Springer
    Journal of materials science 27 (1992), S. 1960-1968 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Coal tar mesophase pitch fibres stabilized at 270° C to different extents were carbonized under strain by the constant load or constant length, using different heating rates, and further graphitized at 2500° C. Shallow and moderate stabilization provided a skin-core structure in the resultant fibres which exhibited higher orientation, tensile modulus, and better graphitizability after calcination at 1300° C and graphitization at 2500° C than deep stabilization. The tensile strength and modulus of the graphitized fibre was significantly improved through the strained carbonization when the stabilization was performed to a moderate extent. The strain tended to give an onion-like alignment in the fibre to improve the preferred orientation of carbon planes. Larger load and more rapid heating during carbonization modified the structure and properties of resultant fibres through a significant longitudinal elongation. The stabilization extent of pitch fibres governs the mobility or fusibility of mesogen molecules at the carbonization which allows their better alignment by the strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01107225
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Diels-Alder reaction of mesophase pitch insoluble fractions with maleic anhydride (1994)
    Springer
    Journal of materials science 29 (1994), S. 1966-1972 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Pyridine insoluble fractions in the mesophase pitches derived from a decant oil (PMP-PI) and naphthalene (NMP-PI) were found to be rendered almost completely soluble in pyridine by the Diels-Alder reaction with maleic anhydride, maintaining their optical anisotropy and molecular association. Their solubility in pyridine reached up to 95 wt % by the reaction at 175–200 °C. Solubilized fractions were analysed to obtain their average structures, suggesting that PMP-PI consists of aromatic nuclei of peri-condensed rings connected through a small number of methylene and aryl-aryl linkages, having a molecular weight (MW) of ∼ 1800, and that NMP-PI consists of oligomeric naphthalene with a large number of naphthenic groups (MW ≃ 1000). Such structures are basically much the same as those of their soluble fractions, although the molecules in Pls were much larger. The reaction sites in such structures for the Diels-Alder reaction are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351321
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Residual stress analysis of joints of ceramics and metals (1994)
    Springer
    Experimental mechanics 34 (1994), S. 116-124 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Development of reliable bonding techniques for ceramics and metals is considered to be very important for more useful applications of ceramics to machinery parts. However, a high thermal stress concentration occurs at the corner of bonded interface in ceramics during the bonding process. This occurs because of the difference in thermal properties of the bond materials and reduces the strength of the bonded joint considerably. The authors have been investigating various methods for effectively decreasing this stress concentration. In this paper, they present theoretical and experimental evidence that the stress concentration can be successfully diminished by varying the apex angle of joints. It is found that the tensile strength of joints increases as the apex angle of metals decreases from 90 deg to 45 deg. It also increases with increasing the apex angle of metals. Numerical calculations confirm these experimental results and the proposed procedure may be useful in the design and manufacture dissimilar joints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325708
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    Paper (German National Licenses)
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