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  • Artikel: DFG Deutsche Nationallizenzen  (8)
  • 1995-1999  (4)
  • 1985-1989  (4)
Datenquelle
  • Artikel: DFG Deutsche Nationallizenzen  (8)
Materialart
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 17 (1988), S. 0 
    ISSN: 1600-0714
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Localization of IgA, secretory component (SC) and J chain was investigated immunocytochemically in minor salivary glands of the lip and palate to define the mechanism involved in the transport of immunoglobulin A (slgA) into the saliva from the minor salivary glands. SC synthesis was detected in mucous acinar cells and ductal epithelial cells. Free SC is secreted into the saliva through secretory granules in the mucous acinar cells. Dimeric IgA containing J chain is translocated through these cells as slgA by a SC-medialed transport mechanism involving cytoplasmic vesicles.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Histochemistry and cell biology 106 (1996), S. 223-227 
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract  In order to develop a stain with increased sensitivity and selectivity for cadmium (Cd), we synthesized and characterized 2-(8-quinolylazo)-4,5-diphenylimidazole (QAI). This chelating agent was more than twice as sensitive for Cd than the best conventional staining agents, including benzothiazolylazo-beta-naphthol. Differentiation between Cd and zinc (Zn) was achieved by immersing tissue sections in TRIS(2-aminoethyl)amine before they were stained with QAI. This pretreatment made it possible to selectively stain for Cd by blocking Zn.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Histochemistry and cell biology 112 (1999), S. 179-182 
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract  In tissues, bromopyridylazo-diethylaminophenol has been found to be capable of staining very small amounts of rare earth metals, particularly praseodymium, terbium, dysprosium, holmium, ytterbium, and lutetium. Differentiation of a target metal from interfering metals was achieved using masking agents, polyphosphates and aminopolycarboxylic acids.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Histochemistry and cell biology 83 (1985), S. 509-512 
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary A highly sensitive and specific method for staining exogenous chromium and iron in tissues is described. This method is superior to conventional complex-forming methods with regard to its sensitivity and specificity for these metals. The staining reaction is based on the metalcatalysed oxidation of phenylamines. Tissue sections were incubated in a medium containing hydrogen peroxide and phenylamines, p-phenylenediamine or phenylhydrazine. Results obtained from test-tube experiments concerning the catalytic activities of metals indicated that the staining reactions depends on the activities of metals in tissues.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Histochemistry and cell biology 87 (1987), S. 327-329 
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary We describe a new autoradiographic technique for differentially demonstrating the presence of trace amounts of cadmium that remains unbound to metallothionein in tissue sections. This procedure involves [14C-1,4,5,8--naphthol]-1-(2-thiazolylazo)-2-naphthol (TAN) instead of a metal radioisotope. Tissue sections were stained using labeled TAN, and were then subjected to routine autoradiographic procedures. The results obtained indicated that the distribution of photographic grains truly reflected the distribution of metallothionein-unbound Cd in the sections. This demonstrates the suitability of this procedure for the differential demonstration of cadmium present in different chemical forms in tissues.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    International journal of fracture 34 (1987), S. 149-157 
    ISSN: 1573-2673
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Résumé On a procédé à l'observation de la forme en ongle que prend le front de la fissure de fatigue que l'on réalise au droit de l'entaille usinée des éprouvettes de traction compactes destinées aux essais de ténacité à la rupture. En supposant que la distribution du facteur d'intensité de contrainte K I le long du front de la fissure est égale à celle correspondant à un front de fissure originalement droit, on obtient un front de fissure légèrement incurvé grâce au recours à la loi de Paris sur la vitesse de croissance d'une fissure de fatigue. En comparant les résultats calculés et les observations expérimentales sur des éprouvettes 10 TCT, dont l'épaisseur atteint 247 mm, on trouver que l'effet de singularités des contraintes à l'intersection de la ligne de front de la fissure et des surfaces libres peut être négligé et que l'accord est extrêmement satisfaisant.
    Notizen: Abstract The thumb-nail shape of a crack front has been observed in a compact tension (CT) specimen, when a fatigue crack is formed ahead of the machined notch in the course of preparation for the fracture toughness testing. Assuming that the distribution of the stress intensity factor K I along the crack front line is equal to that corresponding to the original straight crack front, a slightly curved crack front is obtained with the aid of Paris' law for the fatigue crack growth rate. Comparing the calculated results with the experimental observation in the 10 T CT specimens, whose thickness is 247 mm, it is found that the effect of the stress singularities at the intersection of the crack front line and the free surface can be disregarded and that they show extremely good agreement with each other.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    International journal of fracture 82 (1996), S. 221-235 
    ISSN: 1573-2673
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract In order to maintain structural integrity of welded structures, it is of great importance to evaluate the fitness for serviceability of the structural components, in which fatigue cracks are found during in-service inspections. Crack propagation paths are sometimes prerequisite for the proper estimation of fatigue crack propagation, because curved crack paths and sharp crack turning could occur at the intersections of structural members mainly due to stress biaxiality of repeated loads. In order to investigate this fatigue crack-growth behavior, fatigue crack-propagation tests and numerical simulation are carried out under various biaxial stress range ratios. Morphological mode transitions of fatigue failures are observed in experiments and also by computer simulation. Although simulated modes of failures are in fairly good agreement with the experimental results, discrepancies are sometimes observed for the crack-propagation lives. In order to investigate this problem, the welding residual stresses in the test specimens are measured, and the fatigue crack-propagation lives are quantitatively examined in terms of the combined effects of residual stress distribution and crack paths.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    International journal of fracture 82 (1996), S. 205-220 
    ISSN: 1573-2673
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract In the present paper a simulation method is proposed for the evaluation of paths and lives of fatigue cracks. The simulation is based on an incremental crack extension procedure. At each increment the stress analysis ahead of a crack tip is carried out by the finite element method, and the next incremental crack-growth path is predicted by the first order perturbation method with the use of the local symmetry criterion. From the computational viewpoint, the step-by-step rezoning of finite element mesh subdivision is one of the most difficult processes of the simulation procedure. In order to overcome this difficulty, we shall use the modified quadtree method as an automatic mesh generation technique. Considerations are made for the proper mesh arrangement in the vicinity of a crack tip, where a special fine mesh pattern is embedded so that mixed mode stress intensity factors and the higher order coefficients of the near tip stress field parameters can accurately be obtained. Using the proposed method, we simulate the branched and curved fatigue crack growth in three-point-bending specimens. They show fairly good agreement with the experimental results. The simulation procedure is also applied to biaxially loaded cruciform joints.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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