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  • 1
    Digitale Medien
    Digitale Medien
    Intermediate rings between matrix rings and Ornstein dual pairs (2000)
    Springer
    Archiv der Mathematik 75 (2000), S. 256-263 
    Details
    ISSN: 1420-8938
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract. We show that isomorphism of intermediate rings between row and column finite matrix rings and row finite matrix rings implies Morita equivalence of the coefficient rings and equality of the cardinality of the set of indices. Among the applications we extend the Isomorphism Theorem for Dual Pairs over Division Rings to Ornstein dual pairs over any class of rings for which Morita equivalence implies isomorphism.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s000130050501
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  • 2
    Digitale Medien
    Digitale Medien
    Assessing changes in the genetic diversity of potato gene banks. 1. Effects of seed increase (1997)
    Springer
    Theoretical and applied genetics 95 (1997), S. 191-198 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key words RAPD markers ; Genetic diversity ; Potato gene banks ; Solanum jamesii ; Solanum fendleri ; APIC ; Seed increase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  Effects of gene bank seed-increases on the genetic integrity of potato germ plasm is a major concern of gene bank managers. Thus the Association of Potato Inter-gene-bank Collaborators (APIC), a consortium of world potato gene bank leaders, initiated this joint research project using RAPD markers to determine genetic relationships between increased generations within accessions. Solanum jamesii (2n=2x=24) and S. fendleri (2n=4x=48), two wild potato species native to North America, were used as plant material. These species represented two major breeding systems found among Solanum species: outcrossing diploids and inbreeding disomic tetraploids, respectively. Comparisons were made between populations one generation apart and between sister populations generated from a common source. Fourteen such comparisons within S. jamesii accessions had an average similarity of 96.3%, and 21 such comparisons within S. fendleri accessions had an average similarity of 96.0%. No pairs of populations were significantly different, despite the fact that RAPD markers easily separated all of these very similar accessions within their respective species. Only one of six S. jamesii accessions analyzed showed a significant change in gene frequencies among generations. These findings indicate that there has been minimal loss or change of genetic diversity in ex situ germplasm using the gene bank techniques standard at NRSP-6 and other world potato gene banks.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220050547
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  • 3
    Digitale Medien
    Digitale Medien
    Assessing changes in the genetic diversity of potato gene banks. 2. In situ vs ex situ (1997)
    Springer
    Theoretical and applied genetics 95 (1997), S. 199-204 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Key words RAPD markers ; Genetic diversity ; Potato gene banks ; Solanum jamesii ; S. fendleri ; APIC ; Wild potato populations ; Ex situ conservation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  An important question in the conservation of potato germ plasm is whether germ plasm in the gene bank, although stable, still represents the in situ populations from which it was collected, sometimes many decades ago. The answer would direct objective decisions regarding the value of re-collections and in situ preservation. The present study was undertaken as a project of the Association of Potato Inter-gene-bank Collaborators (APIC). It measured genetic differentiation between potato germ plasm maintained in the US gene bank for many years and current in situ populations re-collected from the same original sites in the wild. Solanum jamesii and Solanum  fendleri from the United States were used as representatives of potato germ plasm. Re-collections were carried out in 1992 at the same locations at which gene bank-conserved accessions had been collected in 1958 and 1978. RAPD markers revealed significant genetic differences between gene bank-conserved and re-collected in situ populations for all seven comparisons of S. jamesii (diploid outcrosser), and 12 of 16 comparisons within S.  fendleri (tetraploid inbreeder). The average genetic similarities were 65.2% for S.  jamesii and 80.4% for S.  fendleri. Possible explanations and consequences of these unexpectedly large differences are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001220050548
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  • 4
    Digitale Medien
    Digitale Medien
    Evaluation of vectorization/parallelization techniques: application to nonparametric curve estimation (1996)
    Springer
    Statistics and computing 6 (1996), S. 347-351 
    Details
    ISSN: 1573-1375
    Schlagwort(e): cross-validation ; high-performance computing ; nonparametric estimation ; parallelization ; plug-in ; vectorization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Mathematik
    Notizen: Abstract The simulation of statistical models in a computer is a fundamental aspect of research in the field of nonparametric curve estimation. Methods such as the FFT (Fast Fourier Transform) or WARP (Weighted Average of Rounded Points) have been developed and analysed for computer implementation of the different techniques in this realm, with the aim of reducing the computation time as much as possible. In this work we analyse two techniques with this objective. These are the vectorization of the source code in which the different algorithms are implemented, and their distributed execution. It can be observed that the vectorization of the programs can improve the results obtained with techniques such as the FFT or WARP, or, in some cases, can prevent the use of these.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00143555
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  • 5
    Digitale Medien
    Digitale Medien
    Approximating Rings with Local Units Via Automorphisms (1999)
    Springer
    Acta mathematica hungarica 82 (1999), S. 229-248 
    Details
    ISSN: 1588-2632
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract For a ring A with local units we investigate unital overrings T of A, and compare the automorphism groups Aut (A) and Aut (T).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026460815618
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  • 6
    Digitale Medien
    Digitale Medien
    A highly efficient electrolytic method for microorganism flocculation from aqueous cultures (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 23 (1981), S. 1165-1168 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260230524
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