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  • 1
    Electronic Resource
    Electronic Resource
    The behavior of human ameloblastoma tissue in collagen matrix in vitro: an immunohistochemical study (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 20 (1991), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We investigated the three-dimensional outgrowth of human ameloblastoma cells cultured in collagen matrix. Growth patterns of four cases of ameloblastoma resembled each other and was characterized by appeared duct-like structures. Case 1 ameloblastoma was subcultured 3 times. Ameloblastoma tissues and cultured cells were stained with various lectins by avidin-biotin peroxidase complex (ABC) staining methods. Both the tissues and cultured cells had the same receptors to Concanavalin ensiforme (Con A), Ricinus communis Agglutinin (RCA-I) and Triticum vulgaris (WGA) but not to Dolichos biflorus (DBA), Ulex europacus (UEA-1), Soybean (SBA) and Arachis hypogea (PNA). These findings indicated that the cultured cells examined in this study were ameloblastoma cells in origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.1991.tb00919.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Behaviour of human ameloblastoma cells in collagen matrix in vitro: an ultrastructural study (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 20 (1991), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We investigated the behaviour of human ameloblastoma cells in collagen matrix in vitro. The ameloblastoma tissue was extirpated from a 75 yr-old woman. Small segments of the tissues were cultured in 0.18% collagen gel. After several weeks, collagen gels containing ameloblastoma tissue were fixed and examined by light microscopy and transmission electron microscopy. Outgrowth of primary cultured cells could be recognized as processes like growth rims around the tissue pieces within 2-3 days after tissue culture. Light microscopically, these cells formed a duct-like structure. The characteristics of ameloblastoma cells in vivo with peripheral epithelial cells and stellate cells reappeared in vitro, and they were connected with one another in cytoplasmic processes by desmosomes. Also, some cells had many intracellular filaments, amorphous nuclei and vacuoles. The results indicated that this culture system in vitro might be applied to the cytogenetic analysis of ameloblastoma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.1991.tb00435.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Age-hardening and the associated phase transformation in an Au-55.2 at% Cu-17.4 at% Ag ternary alloy (1988)
    Springer
    Journal of materials science 23 (1988), S. 2975-2982 
    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 To develop a low gold content dental alloy, age-hardening characteristics in an Au-55.2 at% Cu-17.4 at% Ag alloy were studied by means of hardness, electron microscopy and X-ray diffraction examination. Three distinct age-hardening behaviours depending on temperature were found in the alloy, i.e. (i) a dual mechanism of spinodal decomposition and Cu3Au ordering below 673 K, (ii) a single mechanism of spinodal decomposition at 693 K, and (iii) a single mechanism of nucleation and growth of silver-rich precipitate at 773 K. A marked over-ageing was observed by lengthy ageing over the whole range of temperature. The long-period superstructure of Cu3Au(II) was found only in the grain boundary product at temperatures between 623 and 633 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547478
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Initiation of ordering in an AuCu alloy (1990)
    Springer
    Journal of materials science 25 (1990), S. 5025-5028 
    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 Planar misfit between fcc and fct and elastic anisotropy in a cubic crystal were examined to understand the crystallographic relationship between the ordered domain and the matrix in the ordering of an AuCu alloy. The results of these calculations did not indicate any definite conjugate plane between the ordered phase and surrounding matrix. A model modified from the crystallization phenomena in amorphous alloys was proposed to understand the ordering in the AuCu alloy. According to the model, the degree of order can be varied from the surface of the ordered domain to the matrix with some area of transitional region, i.e. without any defined interface. This leads to the conclusion that the idea of a specific habit plane is meaningless for understanding the initiation of the AuCu ordering. The validity of the model was supported by the direct observation of the initial stage of precipitation in an Al-Li alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00580125
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Age-hardening associated with ordering and spinodal decomposition in a AgCu-40 at % Au pseudobinary alloy (1992)
    Springer
    Journal of materials science 27 (1992), S. 504-510 
    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 The age-hardening mechanism in an AgCu-40 at% Au alloy was studied by means of electrical resistivity measurement, hardness tests, X-ray diffraction and electron microscopy. Two stages of hardening were found by isothermal ageing below 648 K, which was higher than the critical temperature of ordering, T c=620 K, in the present alloy. The first stage of hardening took place by formation of a modulated structure resulting from spinodal decomposition. Further hardening was brought about by ordering, yielding metastable AuCu I′ and/or AuCu II′ ordered platelets grown from the copper-rich portion of the modulated structure. Transitional ordering which gave rise to a marked hardening of the second stage was found, even though the temperature of below 648 K was higher than the T c of the present alloy. Drastic softening was also found on disappearance of the transitional ordered phases. Although the modulated structure was observed by ageing at 773 K, there was no age-hardening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543944
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    Paper (German National Licenses)
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