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  • 2000-2004  (3)
  • 1975-1979  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Photoluminescence from mesoporous silica: Similarity of properties to porous silicon (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3968-3970 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence (PL) from mesoporous silica (MS) with the pore size of ∼6 nm and the thickness of walls among pores of ∼1 nm has been studied at room temperature. The heat pretreatment of MS in air at different temperatures and the variation of the excitation wavelengths allow one to shift the PL peak through the whole visible spectral range. The PL is suggested to originate from nonbridging oxygens (red bands), hydrogen-related species (green bands), and water-carbonyl groups (blue bands). The spectroscopic properties of MS are found to be similar to those of surface-oxidized silicon nanocrystals and porous silicon. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1328364
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cytotoxic effects of dental resin liquids on primary gingival fibroblasts and periodontal ligament cells in vitro (2004)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 31 (2004), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary  Cytotoxic effects of resin liquids of three in situ relining dental polymers, AlikeTM, Kooliner, and Tokuso Rebase, and their major components, methyl methacrylate (MMA), isobutyl methacrylate (IBMA), and 1,6-hexanediol dimethacrylate (1,6-HDMA) were investigated. The concentrations of major monomers in these resin liquids were determined by high-performance liquid chromatography. Cellular viability of human gingival fibroblasts (GF) and periodontal ligament (PDL) cells were evaluated by the 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyltetrazolium bromide assay. Moreover, patterns of cell death were analysed using annexin V/propidium iodide staining with flow cytometry. The results indicated that AlikeTM liquid contained 91·3% MMA, Kooliner liquid contained 94·5% IBMA, and Tokuso Rebase liquid contained 65·8% 1,6-HDMA. All materials examined had cytotoxic effects on GF and PDL cells in dose-dependent manners. Tokuso Rebase liquid appeared to be the most cytotoxic among the various resin liquids examined. The effects of Kooliner and Tokuso Rebase liquids may have resulted from IBMA and 1,6-HDMA, respectively. Furthermore, the majority of treated cells died from necrosis; whereas a small portion of cells died from apoptosis. In conclusion, the results demonstrated that these liquid forms of dental polymers and their major monomers cause cytotoxic reactions. The direct relining procedure that cures these materials in situ should be used cautiously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.2004.01355.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Acylcarnitines in fibroblasts of patients with long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency and other fatty acid oxidation disorders (2000)
    Springer
    Journal of inherited metabolic disease 23 (2000), S. 27-44 
    Details
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Mitochondrial fatty acid oxidation disorders cause hypoglycaemia, hepatic dysfunction, myopathy, cardiomyopathy and encephalopathy. Despite their recognition for more than 15 years, diagnosis and treatment remain difficult. To help design rational diagnostic and therapeutic strategies, we studied the pathophysiology of accumulating metabolites in a whole-cell system. Acylcarnitines were quantified in cells and media of cultured fibroblasts after incubation with L-carnitine and fatty acids. Following incubation with palmitate, long-chain 3-hydroxyacyl-CoA dehydrogenase (LCHAD)-deficient fibroblasts compared with controls showed elevation of hydroxypalmitoyl- and palmitoylcarnitine and reduction of C10- and shorter acylcarnitines, and following incubation with linoleate an increase in C14:2-, C18:2- and hydroxy-C18:2-acylcarnitines and reduction in C10:1-acylcarnitines. Hydroxyacylcarnitines remained more intracellular compared to corresponding saturated acylcarnitines. Incubation with decanoate and octanoate showed absence of hydroxylated acylcarnitines and correction of secondary metabolic disturbances, suggesting that optimal treatment should include medium-chain triglycerides of these chain lengths. Fibroblasts of patients with other fatty acid oxidation disorders showed distinct elevations of disease-specific acylcarnitines. This acylcarnitine analysis allows the diagnosis of LCHAD deficiency and its differentiation from other fatty acid oxidation disorders, which can pose difficulties in vivo. The strategy has allowed in-depth analysis with different substrates, providing suggestions for the rational design of treatment trials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005694712583
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Propagation of a flexure crack: experiment and analysis (1978)
    Springer
    International journal of fracture 14 (1978), S. 281-291 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé Des études expérimentales et des analyses sont effectuées sur la vitesse de lente décélération ou d'accélération d'une fissure de flexion se propageant dans une éprouvette plate en verre. L'éprouvette est soumise à une indentation sphérique sur sa surface supérieure et repose sur un double appui à couteaux ou sur un anneau à sa partie inférieure. La distance entre appui est comparable à l'épaisseur de la plaque de telle sorte qu'un champ de tensions tridimensionnelles puisse s'établir. La distribution des tensions est déterminée analytiquement en fonction de ses composantes de rétraint et de flexion. On montre que la variation de la vitesse de fissuration ne dépend pas de la tension totale règnant en surface mais de la tension provoquant le rétrécissement suivant le plan. On montre que ce type d'expérience ne produit qu'une faible contrainte de rétraint de sorte que l'on observe expérimentalement une faible variation de la vitesse de la fissure au lieu d'une vitesse limite supérieure.
    Notes: Abstract Experiments and analyses are carried out on the low decelerating and accelerating speed of a flexure crack running in a specimen of a glass plate. The specimen is subjected to a spherical indentation on its upper surface and rests on a knife-edge or ring foundation. The span of the foundation is comparable to the plate thickness so that a three-dimensional stress field is established. The stress distribution is determined analytically in terms of its stretching and bending components. It is shown that the variation of the crack speed depends not on the total surface tensile stress, but on the in-plane stretching stress. The experiment is shown to have produced only a small stretching stress so that the low varying speed of the crack, instead of its high limiting speed, was observed experimentally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034689
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    Paper (German National Licenses)
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