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  • 2000-2004  (6)
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  • 1
    Digitale Medien
    Digitale Medien
    Psoriasis scales contain C5a as the predominant chemotaxin for monocyte-derived dendritic cells (2001)
    Copenhagen : Munksgaard International Publishers
    Experimental dermatology 10 (2001), S. 0 
    Details
    ISSN: 1600-0625
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract: Dendritic cells seem to be of major importance for the pathogenesis of psoriasis. They are increased in number in lesional psoriatic skin which is thought to be due to an increased influx from the peripheral blood regulated by chemotaxins. Using a biological/biochemical approach we have addressed the question whether psoriasis scale extracts contain proteinaceous chemotaxins for dendritic cells. Human monocytes differentiated into dendritic cells by culture with GM-CSF and IL-4 (MoDC) served as responder cells. Chemotactic activity for MoDC was purified by several HPLC-steps. The results of our study show that C5a/C5adesarg is the major chemotactic peptide for MoDC in psoriasis scale extracts. In comparison to other stimuli such as fMLP or monocyte chemotactic peptide 1 (MCP-1) C5a proved to be a most potent and efficient chemotaxin for MoDC. C5a co-eluted with MRP14/calgranulin B which is present in large amounts in psoriasis scale extracts as identified by amino acid sequencing. However, MRP14/calgranulin B did not possess any chemotactic activity for MoDC. Our results provide evidence that C5a/C5adesarg although not specific for dendritic cells seems to be the major chemoattractant for these cells in lesional psoriasis skin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1034/j.1600-0625.2001.100403.x
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  • 2
    Digitale Medien
    Digitale Medien
    Microstructure and Texture Evolution during Static Recrystallization of Zr-2Hf Alloy (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 467-470 (Oct. 2004), p. 537-544 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The recrystallization of a Zr-2Hf alloy sheet deformed by plane strain compression atroom temperature and then heat treated in the temperature range 500-650°C is studied. The microstructure, local and global crystallographic textures are investigated by EBSD and X-ray techniques. The as-deformed condition exhibits a heterogeneous microstructure composed of highly and less deformed zones, the EBSD indexing of the latter ones being more reliable. The asdeformed condition displays a (0001) 〈 0 1 10 〉 crystallographic texture. The evolution of themicrostructure during recrystallization very much depends on the amount of local deformation. Recrystallization begins in highly deformed zones, new grains having two variants of texture components, {0001} 〈 0 1 10 〉 and {0001} 〈 0 2 11 〉. Some change of preferred orientations concomitant with grain growth at 600 and 650°C has been observed with a decrease in the {0001} 〈 0 1 10 〉 component and an increase in the {0001} 〈 0 2 11 〉 component
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.467-470.537.pdf
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  • 3
    Digitale Medien
    Digitale Medien
    Nonlinear optical response of a dense two-level atom system embedded in a linear dielectric medium (2000)
    Springer
    Applied physics 70 (2000), S. 65-68 
    Details
    ISSN: 1432-0649
    Schlagwort(e): PACS: 42.65.Pc; 42.65.Hw; 42.50.Fx
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. The nonlinear optical (local) response of a dense collection of two-level atoms embedded in a linear dielectric medium is investigated theoretically. The nonlinear response of absorption and dispersion of two-level atoms associated with a weak probe field in the presence of a strong pump field is calculated in terms of the linear response theory. The numerical results show that the absorption and dispersion spectra are different from those in vacua because of the local-field effect enhancement and the local cooperative effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003400050009
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  • 4
    Digitale Medien
    Digitale Medien
    Microstructure and properties of burn-resistant Ti-Al-Cu alloys (2000)
    Springer
    Journal of materials science 35 (2000), S. 5609-5612 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Ti-Al-Cu series burn-resistant alloys are newly developed materials which have low density, low cost and are easy to process. The results show that Ti-Al-Cu alloys have good burn resistance due to their good thermal conductivity, low melting point, and the existence of Ti2Cu phase which also has a very low melting point. Ti-Al-Cu alloys have excellent thermal processability and good room and high temperature tensile properties, but an increase in copper content harms their thermal stability. After thermal exposure for a long time, Ti2Cu phase will coalesce and coarsen, but the addition of Si and Al will be useful for their thermal stability. The Ti-13Cu-1Al-0.2Si alloy has good thermal stability at 540°C and good creep resistance at 300°C and 100 MPa. The phases of Ti-Al-Cu alloys were found to be composed of α phase and Ti2Cu. The character of the Ti2Cu phase changes with the increasing copper content.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004873501005
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  • 5
    Digitale Medien
    Digitale Medien
    Nonlinear optical responses due to exciton-phonon interactions in strongly coupled exciton-phonon systems (2004)
    Springer
    The European physical journal 30 (2004), S. 117-121 
    Details
    ISSN: 1434-6079
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. The excitonic nonlinear optical responses due to exciton-phonon interactions in strongly coupled exciton-phonon systems are investigated theoretically. It is shown that the influence of exciton-phonon interactions on the nonlinear optical absorptions and Kerr nonlinear coefficients is significant as the signal field frequency detuning from the exciton frequency approaches to the optical phonon frequency. How to manipulate the nonlinear optical responses by using the control fields is also presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjd/e2004-00064-8
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  • 6
    Digitale Medien
    Digitale Medien
    The coherent time evolution of two coupled quantum dots in a two-mode cavity (2004)
    Springer
    The European physical journal 31 (2004), S. 499-506 
    Details
    ISSN: 1434-6079
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. For two coupled identical quantum dots in a two-mode cavity, we determine the conditions of two-photon and single-photon resonance. It is shown that the exciton-phonon interaction reduces the Rabi frequencies of each model and the Förster interaction between double quantum dots even at absolute zero temperature. The exciton-phonon interaction also makes a contribution to the static exciton-exciton dipole interaction energy. Furthermore, the additional interactions can modify the conditions of photon resonance significantly. A more realistic case of two nonidentical quantum dots is also considered. The influence of parameter misfits on the quantum system is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjd/e2004-00149-4
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