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Träfflista för sökning "WFRF:(Neumann I) srt2:(2000-2004)"

Sökning: WFRF:(Neumann I) > (2000-2004)

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  • Magnuson, Martin, 1965-, et al. (författare)
  • Magnetic circular dichroism in X-ray fluorescence of Heuseler alloys at threshold excitation
  • 2001
  • Ingår i: Solid State Communications. - 0038-1098 .- 1879-2766. ; 117:2, s. 79-82
  • Tidskriftsartikel (refereegranskat)abstract
    • The results of fluorescence measurements of magnetic circular dichroism (MCD) in Mn L2,3 X-ray emission and absorption for Heusler alloys NiMnSb and Co2MnSb are presented. Very intense resonance Mn L3 emission is found at the Mn 2p3/2 threshold and attributed to a peculiarity of the threshold excitation in materials with a half-metallic character of the electronic structure. The excitation energy dependence of Mn L2,3 X-ray emission spectra (XES) was measured at beamline ID12B at the European Synchrotron Radiation Facility (ESRF, Grenoble) using 83% circularly polarized X-rays. A very large MCD effect found in XES is attributed to strong exchange splitting of spin-up and spin-down Mn 3d states. The anomalously high ratio of L2 emission intensity to L3 emission intensity is found.
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  • Neumann Andersen, Grethe, et al. (författare)
  • MC(1) receptors are constitutively expressed on leucocyte subpopulations with antigen presenting and cytotoxic functions.
  • 2001
  • Ingår i: Clinical and Experimental Immunology. - 0009-9104 .- 1365-2249. ; 126:3, s. 441-6
  • Tidskriftsartikel (refereegranskat)abstract
    • The expression of melanocortin MC(1) receptors on human peripheral lymphocyte subsets was analysed by flow cytometry using rabbit antibodies selective for the human MC(1) receptor and a panel of monoclonal antibodies against lymphocyte differentiation markers. The MC(1) receptor was found to be constitutively expressed on monocytes/macrophages, B-lymphocytes, natural killer (NK) cells and a subset of cytotoxic T-cells. Interestingly T-helper cells appeared to be essentially devoid of MC(1) receptors. The results were confirmed by RT-PCR which indicated strong expression of MC(1) receptor mRNA in CD14(+), CD19(+) and CD56(+) cells. However, only a faint RT-PCR signal was seen in CD3(+) cells, in line with the immuno-staining results that indicated that only part of the CD3(+) cells (i.e. some of the CD8(+) cells) expressed the MC(1) receptor. The MC(1) receptors' constitutive expression on immune cells with antigen-presenting and cytotoxic functions implies important roles for the melanocortic system in the modulation of immune responses.
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