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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 657 (1992), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 268 (1980), S. 31-42 
    ISSN: 1432-069X
    Keywords: Protoporphyrin ; Violet light ; Photochemical damage ; Fibroblasts ; Protoporphyrin ; violettes Licht ; photochemische Schädigung ; Fibroblasten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Proliferationskapazität der Vorhautfibroblasten, kultiviert in einem Medium mit Protoporphyrin, kann durch Bestrahlung mit violettem Licht zerstört werden. Dieses Phänomen kann durch Bestimmung des kolonienbildenden Vermögens der bestrahlten Zellen festgestellt werden. Potentielle letale Schädigungen können aber unter optimalen Wachstumsbedingungen wieder repariert werden (Inkubation). Wir untersuchten die photodynamisch induzierte Transformation einiger Molekülgruppen in den bestrahlten Zellen. Biochemische Analysen zeigten, daß nur Spuren der ungesättigten Fettsäuren oxidiert wurden. Die SH-Gruppen der Membranen und ebenfalls SH-Gruppen der Zellinhalte sind im Gegensatz dazu sehr empfindlich. Von der Tryptophanmenge konnte 20% während der Bestrahlung vernichtet werden. Im Laufe einer Inkubationsperiode unmittelbar nach der Bestrahlung fand eine Wiederherstellung der Tryptophanmenge und der schon genannten SH-Gruppen statt, die gut mit der Regeneration der überlebenden Zellen korrelieren.
    Notes: Summary Foreskin fibroblasts cultured in a medium containing protoporphyrin and exposed to violet light lose the capacity to proliferate. This phenomenon can be assessed on the basis of the ability of the irradiated cells to form colonies. Potentially lethal injuries can, however, be repaired during post-irradiation incubation under optimal growth conditions. We investigated the photodynamically induced transformations of certain molecular targets in the irradiated cells. Biochemical analysis showed that only traces of unsaturated fatty acids were oxidized, but SH groups of both the membranes and the cytosol appeared to be very sensitive targets. Of the tryptophan content, 20% was damaged during irradiation. Recovery was observed during post-irradiation incubation. The tryptophan content and the SH groups recovered to some extent, and these results showed a good correlation with the regeneration of surviving cells.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 82 (1990), S. 25-32 
    ISSN: 1432-1106
    Keywords: Retina ; Development ; In situ hybridization ; Gene expression ; Immunohistochemistry ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The expression of the synapsin I gene was studied during postnatal development of the rat retina at the mRNA and protein levels. In situ hybridization histochemistry showed that synapsin I mRNA was expressed already in nerve cells in the ganglion cell layer of the neonatal retina, while it appeared in neurons of the inner nuclear layer from postnatal day 4 onward. Maximal expression of synapsin I mRNA was observed at P12 in ganglion cells and in neurons of the inner nuclear layer followed by moderate expression in the adult. At the protein level a shift of synapsin I appearance was observed from cytoplasmic to terminal localization during retinal development by immunohistochemistry. In early stages (P4 and P8), synapsin I was seen in neurons of the ganglion cell layer and in neurons of the developing inner nuclear layer as well as in the developing inner plexiform layer. In the developing outer plexiform layer synapsin I was localized only in horizontal cells and in their processes. Its early appearance at P4 indicated the early maturation of this cell type. A shift and strong increase of labelling to the plexiform layers at P12 indicated the localization of synapsin I in synaptic terminals. The inner plexiform layer exhibited a characteristic stratified pattern. Photoreceptor cells never exhibited synapsin I mRNA or synapsin I protein throughout development.
    Type of Medium: Electronic Resource
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