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  • 71.55.Ht  (1)
  • Cell line  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Applied physics 59 (1994), S. 365-372 
    ISSN: 1432-0630
    Schlagwort(e): 71.70.Ch ; 71.55.Ht
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Studies of the photoluminescence spectra of Cr3+ ions in KMgF3 crystals co-doped with Cr3+ and Ni2+ ions are reported. Several crystal field sites are identified by the different R-line spectra due to the 2 E→4 A 2 transition and broadband luminescences associated with the 4 T 2→4 A 2 transitions. Cr3+ ions substituting without local charge compensation on the octahedral Mg2+ site give rise to a low temperature R line in photoluminescence at λ=702.3 nm with a radiative decaytime of 3 ms at T=14 K. At T=300 K this isotropic centre gives rise to an unpolarized broadband 4 T 2→4 A 2 emission, which results from the thermal occupancy of an excited 4 T 2 state just above the 2 E level which, at lower temperature, gives rise to emission in the R-line. Other crystal field sites are due to some Cr3+ ions having Mg2+ or K+ vacancies in nearest-neighbour positions, these vacancies being required to maintain charge neutrality in doped fluoride perovskites. The Cr3+−K+ vacancy complex results in the centre having trigonal symmetry, and low temperature, photoluminescence via R 1 and R 2 lines at 716.8 nm and 716.0 nm, respectively. Finally, Cr3+ ions having a nearest neighbour Mg2+ vacancy have tetragonal symmetry, experiencing weak crystal fields. In consequence, the 4 T 2 level lies below 2 E and the photoluminescence spectrum at low temperature takes the form of a polarized broad 4 T 2→4 A 2 band with peak at 760 nm and radiative decaytime of 54 μs.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Journal of cancer research and clinical oncology 101 (1981), S. 91-100 
    ISSN: 1432-1335
    Schlagwort(e): Leukemia-lymphoma ; Cell line ; Surface marker ; Hematopoietic differentiation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary By means of the multiple marker analysis, a total of 55 human leukemia-lymphoma cell lines which included 15 T-cell, 30 B-cell, four myelomonocytic-cell, and six non-T, non-B cell lines was characterized for their marker profiles. The multiple markers used included a number of cell surface markers as detected by either rosette or immunofluorescence tests, enzyme assays, cytogenetic analysis, and certain functional assay. Based on the criteria previously defined it was found that all the cell lines were proved to represent original leukemia-lymphoma of ALL, AML, CLL, CML in blastic phase or variety of lymphomas. The monoclonality, a “frozen” state at a specific stage of differentiation-maturation, and cytogenetic marker in each leukemia-lymphoma cell line were remarkable common properties and were stable for years of cultivation. Similar, if not identical, general characteristics were observed in the study on 344 cases of uncultured fresh leukemia-lymphomas by the multiple marker analysis. While no single marker specific to any type of tumor was found, the study offers not only a basis for better understanding of the biology of leukemia-lymphoma but also an insight into normal hematopoietic cell differentiation in man.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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