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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 387-391 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have compared the biquadratic coupling in epitaxially grown Fe/Au/Fe(100)-systems with different interface roughness. The profound short-period oscillations observed on the smooth samples are found to be wiped out for the sample with rougher interfaces. In addition, a stronger biquadratic coupling has been observed. For all measured Au-interlayer thicknesses (1.3–2.4 nm) the biquadratic coupling dominates the antiferromagnetic and ferromagnetic coupling, in contrast to the measurements of the samples with smooth interfaces. The observed increase in biquadratic coupling can be explained in the frame of the currently proposed magnetic-dipole mechanism. The experimental results are in a good agreement with the calculation based on this mechanism, which used the roughness parameters obtained by scanning tunneling microscopy and which did not need any fitting parameters. Thus the existence of the magnetic-dipole coupling mechanism has been confirmed experimentally. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 74 (1970), S. 162-170 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurde der Zusammenhang zwischen der Methylierung von Ribonucleinsäuren durch S-Adenosylmethionin und Dimethylnitrosamin untersucht. Die physiologische Methylierung der RNS durch 3H−CH3-l-Methionin läßt sich nicht durch hohe Dosen Dimethylnitrosamin kompetitiv hemmen. Hohe Dosen von S-Adenosylmethionin führen nicht zu einer Verringerung, sondern zu einer Steigerung der 14C-7-Methylguanin-Bildung durch 14C-Dimethylnitrosamin. Diese Steigerung ist von der Dimethylnitrosamin-Dosis und der Wirkungsdauer abhängig. Außerdem bewirkt S-Adenosylmethionin einen vermehrten biosynthetischen Einbau der Aktivität des 14C-Dimethylnitrosamins in die Purinbasen.
    Notes: Summary The relation between the methylation of RNA by S-adenosylmethionine and dimethylnitrosamine was investigated. The formation of 7-methylguanine by 3H−CH3-l-methionine is not reduced competitively by high dosages of dimethylnitrosamine. High dosages of S-adenosylmethionine do not reduce, but increase the methylation of RNA by 14C-dimethylnitrosamine in dependence of the dosages of dimethylnitrosamine and the time of action. In addition the application of S-adenosylmethionine leads to an increased incorporation of the activity from 14C-dimethylnitrosamine into the purine bases.
    Type of Medium: Electronic Resource
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