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  • 2005-2009  (2)
  • 1985-1989  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Genetic analysis of fish genomes and populations: allozyme variation within and among Atlantic salmon from Downeast rivers of Maine (2005)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 67 (2005), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Analysis of genetic variation within and among samples of naturally produced Atlantic salmon (n = 372) from 7 Maine (U.S.A.) and one Canadian river were conducted based on 54 allozyme loci. Eight of the 54 loci proved polymorphic, and estimated heterozygosities (HS) based on all loci ranged from 0·012 to 0·026 (mean = 0·021, s.e. = 0·002). Only one of 56 tests revealed genotypic proportions that deviated significantly from Hardy–Weinberg expectations. Genetic distances (D) between samples ranged from 0·002 to 0·022. No obvious association existed between genetic and geographic distances. Cluster analysis of genetic distances revealed the Dennys River sample as the most differentiated when all samples were included in the analysis, though bootstrap support of the cluster analysis was generally weak. G-tests revealed significant differences in allele frequencies among samples at five of the polymorphic loci, and the G-value summed over all loci also indicated significant differences among samples. FST values indicated that 3·4% of the total genetic diversity was due to variability among samples, while 96·6% was due to variability within samples. These results indicate that the Atlantic salmon analyzed in this study had levels of genetic variability and differentiation among samples comparable to native populations from other areas collected across a similar geographic range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2005.00842.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transient radio bursts from rotating neutron stars (2006)
    [s.l.] : Nature Publishing Group
    Nature 439 (2006), S. 817-820 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The radio sky is relatively unexplored for transient signals, although the potential of radio-transient searches is high. This was demonstrated recently by the discovery of a previously unknown type of source, varying on timescales of minutes to hours. Here we report a search for radio sources ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04440
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ground state and excitational properties of atoms (1989)
    Springer
    The European physical journal 13 (1989), S. 345-354 
    Details
    ISSN: 1434-6079
    Keywords: 71.10. + x ; 31.10. + z ; 35.50. + w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have carried out self-consistent electronic structure calculations on atoms, positive and negative ions and on X-ray transition energies by employing a generalized version of the Kohn-Sham theory which applies to anyN-electron eigenstate. This theory has recently been developed by Fritsche (Phys. Rev. B33, 3976 (1986)). As in the original Kohn-Sham version of density functional theory, it turns out that exchange and correlation can rigorously be described by a local energy-independent potential. The latter is in the present paper approximated by using correlation factors that have the form of a Gaussian or of a Lorentzian to the power 5/2. The width of these functions is determined via the familiar sum rule. We present results on atoms of the first three rows of the periodic table and on some heavier atoms. It is furthermore shown that the generalized Kohn-Sham theory can successfully be applied to multiplet states of free atoms. We discuss results on helium, carbon, oxygen and silicon. It may generally be stated that our approach yields a better overall agreement with the experimental data than any other approximation that has been used so far within density functional theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01398901
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    Paper (German National Licenses)
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