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  • 1
    Electronic Resource
    Electronic Resource
    The coupling of Cr to Fe studied by circular magnetic X-ray dichroism (1995)
    Springer
    Applied physics 61 (1995), S. 119-122 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 73.40 ; 75.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The coupling of Cr to Fe in stacked Cr/Fe/Cr trilayers is studied by circular magnetic X-ray dichroism using fluorescence yield to monitor the absorption. From the dichroic spectra, we determine the thickness dependent average magnetic coupling of Cr to Fe for Cr layer thicknesses of 1, 2 and 3 ML. We compare our results to new calculated spectra. Additionally, all Cr spectra show significant contributions due to photon scattering processes at theL 2, 3 absorption edges depending on the degree of circular polarization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538376
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cytochemical localization of cellulase activity in pollen mother cells of david lily during meiotic prophase I and its relation to secondary formation of plasmodesmata (1998)
    Springer
    Protoplasma 204 (1998), S. 128-138 
    Details
    ISSN: 1615-6102
    Keywords: Cellulase ; Cytochemical localization ; Cytoplasmic channel ; Lilium davidii var.willmottiae (Wilson) Roffill ; Pollen mother cell ; Secondary plasmodesma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cellulase activity was localized at the ultrastructural level in pollen mother cells (PMCs) of David lily [Lilium davidii var.willmottiae (Wilson) Roffill] at different stages of meiotic prophase I. The enzyme was observed to appear at the early leptotene stage and reached its highest level at the subsequent zygotene stage, and its subcellular distribution revealed by the presence of electron-dense deposits of reaction product was found to be restricted exclusively to the endoplasmic reticulum (ER), the vesicles derived from that, and the cell wall, especially at the sites of secondary plasmodesmata and cytoplasmic channels where the wall was being digested. Other cytoplasmic organelles, such as dictyosomes and Golgi vesicles, lacked such deposits of reaction product. After zygotene the enzyme activity decreased abruptly, and at the pachytene stage only very few deposits could be observed in the cell wall. Our results indicate that cellulase is synthesized on rough ER and secreted directly via the smooth ER and ER-derived vesicles into the cell wall by exocytosis, where it brings about local wall breakdown, leading to the secondary formation of plasmodesmata and cytoplasmic channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01280319
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    Paper (German National Licenses)
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