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  • Electronic Resource  (2)
  • Biochemistry and Biotechnology  (1)
  • Cytochemie  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 50 (1972), S. 510-516 
    ISSN: 1432-1440
    Keywords: Chronic granulocytic leukaemia ; storage cells ; cytochemistry ; electron microscopy ; Leukämie ; chronische ; Myeloische ; Speicherzellen ; Cytochemie ; Elektronenmikroskopie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es konnte cytochemisch und elektronenmikroskopisch nachgewiesen werden, daß es sich bei den sog. Gaucher-Zellen der chronischen Myelose um phagocytierende Reticulumzellen handelt, die in spindelförmigen Einschlußkörpern gespeicherte Glucolipide enthalten. Die gespeicherten Lipide stammen aus den phagocytierten Granulocyten, die in den Reticulumzellen durch lysosomale Enzyme abgebaut werden. Durch den positiven Nachweis der Berliner Blau-Reaktion ist ein Abbau von Erythrocyten oder Erythroblasten in diesen Zellen ebenfalls wahrscheinlich. In elektronenmikroskopischen Hochauflösungsaufnahmen unterscheidet sich das gespeicherte Material von dem in den echten Gaucher-Zellen der erblichen Sphingolipidose. Es besteht nicht aus Tubuli, sondern aus lamellären Systemen dunkler (40 Å) und heller (30 Å) Schichten, die sowohl in der Längsrichtung als auch in der Querrichtung gebogen sind.
    Notes: Summary Cytochemistry and electron microscopy permitted to demonstrate that the so called Gaucher cells in chronic myelogenous leukaemia are phagocytosing reticular cells which contain stored glucolipides in spindle-shaped cytoplasmic sacs. The stored lipids derive from ingested granulocytes destructed in the reticular cells by lysosomal enzymes. Furthermore, Prussian blue staining indicates that the presence of a phagocytosis of erythrocytes or erythroblasts by these cells has to be supposed. High resolution electron microscopy reveals that the stored material differs from that found in storage cells of Gaucher's disease. It does not consist of tubuli but of a lamellar system of dark (40 Å) and light (30 Å) layers, which are curved in the longitudinal as well as in the cross-sectional view.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A procedure for the quantification of double-strand breaks in yeast is presented that utilizes pulsed field gel electrophoresis (PFGE) and a comparison of the observed DNA mass distribution in the gel lanes with calculated distributions. Calculation of profiles is performed as follows. If double-strand breaks are produced by sparsely ionizing radiation, one can assume that they are distributed randomly in the genome, and the resulting DNA mass distribution in molecular length can be predicted by means of a random breakage model. The input data for the computation of molecular length profiles are the breakage frequency per unit length, α, as adjustable parameter, and the molecular lengths of the intact chromosomes. The obtained DNA mass distributions in molecular length must then be transformed into distributions of DNA mass in migration distance. This requires a calibration of molecular length vs. migration distance that is specific for the gel lane in question. The computed profiles are then folded with a Lorentz distribution with adjusted spread parameter Γ to account for and broadening. The DNA profiles are calculated for different breakage frequencies α and for different values of Γ, and the parameters resulting in the best fit of the calculated to the observed profile are determined.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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