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  • 1
    Electronic Resource
    Electronic Resource
    Time-of-flight neutron small-angle scattering from a superconducting composite wire (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 611-614 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The precipitation behavior in the Ti–27at.%Nb–6at.%Ta–6at.%Zr alloy aged at 643 K was examined by means of time-of-flight neutron small-angle scattering. When the alloy was aged, fine-scale α precipitates appeared. During the precipitation process, each precipitate grew in size, but the total number of precipitates remained nearly constant up to 1 Ms of ageing. The increase of critical superconducting current density could be connected with increasing size of α precipitates. The specimen for the measurements consisted of a composite containing 3721 filaments in a copper matrix. The use of neutrons was shown to give great advantages for the investigation of precipitation phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889882012771
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Elemental composition of the dense bodies of rat platelets determined by electron probe X-ray microanalysis of freeze-substituted sections (1983)
    Springer
    Histochemistry and cell biology 77 (1983), S. 329-337 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A semiquantitative x-ray microanalytical study was made of dense bodies in rat and human blood platelets prepared by freeze substitution. After the freeze substitution, electron dense bodies containing 5-hydroxytryptamine(5-HT) were well preserved. Electron probe x-ray microanalyses clearly defined species differences in the cations of dense bodies of rat and man. Direct calculation of elemental concentration ratios demonstrated a high level of Mg, with lesser amounts of K and Ca in rat, while there was a negligible level of Mg in man but a high amount of Ca. These results indicate that freeze-substitution is a suitable preparation for the study of diffusible electrolytes which may open the way to quantitative analysis using appropriate standards for analytical electron microscopy of resin sections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00490896
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of nuclear and cytoplasmic information in the progeny of a somatic hybrid between male sterile Nicotiana tabacum and N. glutinosa (1984)
    Springer
    Theoretical and applied genetics 68 (1984), S. 95-100 
    Details
    ISSN: 1432-2242
    Keywords: Nicotiana somatic hybrid ; Ribosomal RNA gene ; Chromosome ; Chloroplast DNA ; Cytoplasmic male sterility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Several nuclear and cytoplasmic characters of the back-crossed progeny of a somatic hybrid between male sterile Nicotiana tabacum (N. debneyi cytoplasm) and N. glutinosa have been analysed. Progeny were obtained by repeated back-crossing of a somatic hybrid with pollen from either N. tabacum or N. glutinosa. Nuclear ribosomal RNA genes (rDNA) were found to be a reliable marker to determine the constitution of nuclear genomes in the progeny. The progeny obtained by back-crossing with N. tabacum pollen maintained uniformity in leaf morphology. On the other hand, variation in leaf morphology was observed in the second back-cross population obtained with N. glutinosa pollen. This may be due to a variable contribution of N. tabacum chromosomes. Segregation of rDNA was also found in individuals of the same back-crossed progeny, but was not related to the chromosome number. The stable inheritance of chloroplast DNA in the back-crossed generation was confirmed regardless of the type of pollen donor. Male sterility was consistently maintained throughout several generations, suggesting that the nuclear genome of either N. tabacum or N. glutinosa does not influence the expression of cytoplasmic male sterility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00252321
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of chromosomes and ribosomal RNA genes in parasexual hybrids ofNicotiana (1984)
    Springer
    Protoplasma 121 (1984), S. 228-231 
    Details
    ISSN: 1615-6102
    Keywords: Nicotiana ; Somatic hybrids ; Chromosome ; Ribosomal ; RNA genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The frequency of hybrid formation among calli developed from protoplasts ofNicotiana glauca andN. langsdorffii which had been treated with polyethylene glycole — Ca++ was determined. Approximately 5% of calli were proven to be somatic hybrids regardless selection pressure. Observation of chromosomes of selected hybrids showed variation in number ranging from 57–128, whereas parents contained 34–48. Analysis of ribosomal RNA genes (rDNA) confirmed every hybrid clone to contain rDNA from both parents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01282316
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    Paper (German National Licenses)
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