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  • 1
    ISSN: 1432-1440
    Keywords: Deoxyribonucleases ; diagnosis ; DNA-damage ; microdiscelectrophoresis ; repairmechanism ; urine ; Xeroderma pigmentosum ; Desoxyribonucleasen ; Diagnose ; DNA-Schaden ; Microdiscelektrophorese ; Repairmechanismus ; Urin ; Xeroderma pigmentosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Verteilungsmuster der DNase-Aktivität1 im Urin von Normalpersonen und X.p.-Patienten wurde mit einem mikro-disk-elektrophoretischen Verfahren untersucht. Bei saurer Inkubation sind 4 distinkte Aktivitätsbanden im Normalurin nachweisbar. Urin von X.p.-Patienten zeigt eine deutliche Verminderung der 2.–4. Bande, wobei die Veränderung der 3. Bande besonders auffällig ist. Es wurde ferner untersucht, wie sich das Verhalten verändert, wenn statt nativer DNA denaturierte als Substrat angeboten und wenn die zweiwertigen Ionen durch EDTA komplexiert wurden. Eine Aktivitätsverminderung ist nicht auf das Auftreten von Inhibitoren zurückzuführen, sondern wahrscheinlich durch eine Konzentrationsverminderung an Enzym verursacht.
    Notes: Summary The distribution pattern of desoxyribonuclease (DNase) activity1 in the urine of healthy subjects and xeroderma pigmentosum (X.p.) patients has been examined by micro disc electrophoresis. When incubated at pH 5.0, four distinct bands of DNase activity are shown in normal urine. In urine of X.p. patients a significant decrease of the second to fourth band can be observed. The change of the third band is extremely obvious. Further to the influence of native DNA, denaturated DNA and EDTA on the pattern of DNase activities were studied. The decrease of DNase activity in X. p. urine is not due to the presence of an inhibitor but is rather caused by lower enzyme concentrations.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 30 (1974), S. 51-61 
    ISSN: 1432-0533
    Keywords: Medulloblastoma ; Brain Tumors ; Rosenthal Fibers ; Ultrastructure of Glial Filament Dysplasia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A light and electron microscopic study on a surgically removed medulloblastoma with spongioblastic cells was carried out. In these cells the massive occurrence of glial fibrils is a frequent finding. In addition there were observed many cells with abundant droplike inclusions. Those inclusions are formed by aggregation of glial filaments in a similar manner like Rosenthal Fibers. This process is obviously combined with a dystrophic alteration of the cell. It is suggested that the occurrence of these spongioblastic cells in a medulloblastoma is rather due to a differentiation of medulloblastoma cells, than to a coincidence of 2 kinds of neoplasms. This phenomenon points to the neuroectodermal origin of the medulloblastoma.
    Type of Medium: Electronic Resource
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