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  • 1
    Electronic Resource
    Electronic Resource
    The Ds1 controlling element family in maize andTripsacum (1987)
    Springer
    Journal of molecular evolution 26 (1987), S. 329-334 
    Details
    ISSN: 1432-1432
    Keywords: Maize ; Ac ; Ds ; Controlling elements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Hybridization experiments indicated that the maize genome contains a family of sequences closely related to the Ds1 element originally characterized from theAdh1-Fm335 allele of maize. Examples of these Ds1-related segments were cloned and sequenced. They also had the structural properties of mobile genetic elements, i.e., similar length and internal sequence homology with Ds1, 10- or 11-bp terminal inverted repeats, and characteristic duplications of flanking genomic DNA. All sequences with 11-bp terminal inverted repeats were flanked by 8-bp duplications, but the duplication flanking one sequence with 10-bp inverted repeats was only 6 bp. Similar Ds1-related sequences were cloned fromTripsacum dactyloides. They showed no more divergence from the maize sequences than the individual maize sequences showed when compared with each other. No consensus sequence was evident for the sites at which these sequences had inserted in genomic DNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101151
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Numerische Untersuchung des Sperrverhaltens von planarenpn-Übergängen mit Feldplatten (1986)
    Springer
    Electrical engineering 69 (1986), S. 165-174 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The blocking capability of the planarp-n junction with a single-step metal field plate is studied. The breakdown voltage as a function of diffusion depth, field plate length and surface charge density is investigated. The calculations are based on the numerical solution of the Poisson equation using the finite difference method. Eliminating the commonly used idealization of an infinite field plate results in the occurrence of an optimal field plate length. Furthermore, the breakdown voltage of a planar junction equipped with a two-step field plate experimentally investigated by other authors is calculated.
    Notes: Übersicht Die Sperreigenschaft eines planarenpn-Überganges mit einer einstufigen Feldplatte wird untersucht, wobei die bisher in der Literatur verwendete Idealisierung einer unendlich langen Feldplatte fallengelassen wird. Es wird der Einfluß der Feldplattenlänge, der Diffusionstiefe und der Oberflächenladungsdichte durch Lösung der zweidimensionalen Poisson-Gleichung mit der Methode der finiten Differenzen berechnet und das Auftreten einer optimalen Feldplattenlänge gezeigt. Weiterhin wird die Durchbruchspannung einer zweistufigen Feldplattenstruktur berechnet, die von anderen Autoren experimentell untersucht worden ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574621
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The ribosomal RNA genes in synthetic tetraploids of wheat (1987)
    Springer
    Theoretical and applied genetics 75 (1987), S. 138-143 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Ribosomal RNA genes ; Synthetic tetraploids ; Evolution ; Nucleolar activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ribosomal RNA genes in the A genome of tetraploid (AABB) wheats are either absent or present at low levels. In four synthetic AABB tetraploids tested by in situ hybridization with a radioactive probe, the level of radioactive label at A and B NOR's corresponded to those of the parent species. There was no reduction after ten generations. In addition, the A chromosome rDNA is transcriptively active, the numbers of nucleoli being governed by the number of rRNA gene repeats in the smaller of the two A-genome NOR's. Since the wild tetraploid Triticum dicoccoides, as well as its domesticated derivatives, lack A-genome NOR's, their deletion is likely to have occurred prior to domestication, i.e. more than 10,000 years ago.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249154
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    Paper (German National Licenses)
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