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  • Thomsen-Friedenreich antigen  (2)
  • 07.77  (1)
  • 12.20.Fv  (1)
  • 72.80  (1)
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Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Amorphous hydrogenated silicon studied by positron lifetime spectroscopy (1986)
    Springer
    Applied physics 40 (1986), S. 145-149 
    Details
    ISSN: 1432-0630
    Keywords: 71.60 ; 72.80 ; 78.70 Bj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Hydrogenated amorphous silicon (a-Si:H) prepared by dc glow discharge in silane was investigated by positron lifetime measurements at room temperature. The lifetime spectrum shows considerably longer lifetimes than in simultaneously measured Si single crystals. The dominant component with the time constantτ 2=402 ps is discussed thoroughly in conjunction with positron trapping at microvoids containing more than 10 to 15 vacancies. Positron trapping at H-saturated dangling bonds cannot be ruled out. The long-lived component withτ 3=1800 ps (I 3=0.06) indicates positronium formation at larger voids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617395
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The positron beam at the stuttgart pelletron accelerator and its applications toβ +γ positron lifetime measurements (1987)
    Springer
    Applied physics 43 (1987), S. 261-267 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.70 ; 07.77
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A slow-positron source has been installed in the therminal of an electrostatic 6.5 MeV accelerator and provides a monoenergetic positron beam in the few-MeV range. It will be used to operate a “fast” positron lifetime spectrometer based onβ + γ coincidences. The properties of the beam, the expected performance of the spectrometer, its advantages over conventionalγγ lifetime measurements, a number of intended applications, as well as recent positron-electron scattering experiments and plans for positron channelling and channelling-radiation studies are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635181
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The presence and significance of the Thomsen-Friedenreich antigen in mammary gland (1979)
    Springer
    Journal of cancer research and clinical oncology 93 (1979), S. 205-214 
    Details
    ISSN: 1432-1335
    Keywords: Thomsen-Friedenreich antigen ; Breast carcinoma ; Histochemistry ; Lectin ; Neuraminidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Normal tissue as well as various benign and malignant lesions of the breast were histochemically examined for the presence of the Thomsen-Friedenreich (TF)-antigen. Fluorescein- or 3H-labelled peanut agglutinin was used for this purpose, a lectin that is known to have a high affinity for the TF-antigen. The occurrence of this TF-antigen seemed in all cases, even in the carcinoma lobulare in situ that is regarded as being derived from myoepithelial cells by some authors, to be associated with a secretory condition. Its presence (free and neuraminicacid covered) in normal, hyperplastic and malignant breast tissue, however, cannot be considered a specific tumour associated antigen as has been previously assumed. Furthermore the investigations have shown that the intensity of fluorescence for peanut agglutinin (PNA)-receptors was generally stronger in differentiated carcinomas than in undifferentiated carcinomas of the breast. The histochemical findings are discussed with regard to diagnostical and immunotherapeutical aspects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406579
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Histochemical methods for the demonstration of thomsen-friedenreich antigen in cell suspensions and tissue sections (1978)
    Springer
    Journal of molecular medicine 56 (1978), S. 761-765 
    Details
    ISSN: 1432-1440
    Keywords: Thomsen-Friedenreich Antigen ; Erdnußagglutinin ; Neuraminidase ; Autoradiographie ; Fluorescenzmikroskop ie ; Thomsen-Friedenreich antigen ; Peanut agglutinin ; Neuraminidase ; Autoradiography ; Fluorescence microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary 1. Three different methods are described for the visualisation of the Thomsen-Friedenreich (TF) antigen on cell suspensions, formalin-fixed and paraffin embedded or frozen tissue sections: a) Rosette formation with chicken and sheep erythrocytes. b) Fluorescence-microscopy with fluorescein labelled peanut agglutinin. c) Autoradiography with3H-labelled peanut agglutinin. 2. The TF antigen was shown, as far as presently investigated, to be exposed on various blood cells, glomerula of the kidney and normal mammary gland after neuraminidase treatment. Mammary gland was also shown to possess TF receptors without prior treatment with neuraminidase. 3. The exposure of this cryptantigen can be brought about by bacterial or viral neuraminidase and is followed by an antigen/antibody reaction, which can lead to possible pathological consequences.
    Notes: Zusammenfassung 1. Drei verschiedene Methoden zur Darstellung von sog. Thomsen-Friedenreich (TF)-Antigenen in Zellsuspensionen, an Formalin-fixiertem und in Paraffin eingebettetem Gewebe sowie in Gefrierschnitten werden beschrieben: a) Rosetten-Bildung mit Hühner- und Schaferythrocyten. b) Fluorescenzmikroskopie mit Fluorescein-markiertem Erdnußagglutinin. c) Autoradiographie mit3H-markiertem Erdnußagglutinin. 2. Nach Neuraminidasebehandlung konnten TF-Antigene — soweit bisher untersucht — auf verschiedenen Blutzellen, in Nierenglomerula und in normalem Brustdrüsengewebe nachgewiesen werden. Ein Teil derartiger Antigene lag im Brustdrüsenparenchym auch bereits als freie Rezeptoren vor, d. h. waren nicht von Neuraminsäure bedeckt. 3. Die Freilegung dieser Kryptantigene kann im Rahmen von Infektionen durch bakterielle und virale Neuraminidase erfolgen. Dabei kommt es zu einer Antigen/Antikörper Reaktion mit unter Umständen klinisch relevanten Folgen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476765
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy (1988)
    Springer
    The European physical journal 330 (1988), S. 173-181 
    Details
    ISSN: 1434-601X
    Keywords: 13.10.+q ; 12.20.Fv ; 14.80.Pb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A monoenergetic positron (e +) beam (ΔT/T〈5·10−4) from the Stuttgart pelletron accelerator and a 4.6 mg/cm2 Be target has been employed to investigatee + e −scattering in the MeV region in a large solid angle with high statistics by means of a novel positionsensitive detector system. Superimposed on the Bhabha scattering, a structure has been found at ane + kinetic energy of 2263 keV (810 keV excitation energy in thee + e −rest frame). From the energy-integrated resonance cross-section of $$\sigma _{res} \cdot \Gamma _{res}^{e^ + e^ - } $$ ≅30 b·eV (c.m.) and the standard resonance cross-section we estimate partial resonance widths $$\Gamma _{res}^{e^ + e^ - } $$ ≅72 meV or 24 meV for total angular momenta J=0 or J=1, respectively. The structure, which has not been predicted within the framework of quantum electrodynamics, coincides with one of the sum energies of the correlatede + e −lines observed in heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293393
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    Paper (German National Licenses)
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