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  • 2000-2004  (3)
  • 1930-1934  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Observations of ovarian involution in the Australian grayling (Prototroctes mareana) (2004)
    Oxford, UK : Munksgaard International Publishers
    Ecology of freshwater fish 13 (2004), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  – A 2-year study of the threatened Australian grayling, Prototroctes mareana, was undertaken to investigate its reproductive strategy in relation to river flow. Monitoring of reproductive maturity in the Barwon River in south-eastern Australia indicated that no spawning occurred in the 2 years. In both years, ovarian involution was observed in a large proportion of the sampled population; flows during this period were less than the historical average. When coupled with the historical evidence, these observations suggest that spawning coincides with increased river discharge. River regulation may inhibit spawning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0906-6691.2004.00020.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Minimal Presentations and Efficiency of Semigroups (2000)
    Springer
    Semigroup forum 60 (2000), S. 231-242 
    Details
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: S is said to be efficient if it can be defined by a presentation (A | R) with |R| -|A|=rank(H 2(S)). In this paper we demonstrate certain infinite classes of both efficient and inefficient semigroups. Thus, finite abelian groups, dihedral groups D 2 n with n even, and finite rectangular bands are efficient semigroups. By way of contrast we show that finite zero semigroups and free semilattices are never efficient. These results are compared with some well-known results on the efficiency of groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002339910016
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence from episodic seamount volcanism for pulsing of the Iceland plume in the past 70 Myr (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 408 (2000), S. 954-958 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The North Atlantic volcanic province has been attributed to continental rifting about 60 Myr ago over an Iceland plume head with a diameter of 1,000–2,000 km (refs 1, 2). But evidence from a few igneous centres has been used to infer that earlier ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35050066
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Über die Umkehrbarkeit der Konzentrationsvorgänge bei der Harnbildung (1933)
    Springer
    Pflügers Archiv 231 (1933), S. 280-298 
    Details
    ISSN: 1432-2013
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung In früheren Arbeiten wurde der Beweis erbracht, daß zwischen einfachen Diffusionsvorgängen und den Sekretionserscheinungen der Niere in bezug auf die Konzentrations- und die Zeitverhältnisse sowie auf die Größe der Konstanten, die bei verschiedenen Substanzen ermittelt wurden, ein enger Parallelismus besteht. Nun können Diffusionsvorgänge als physikalische Annäherung an einen Gleichgewichtszustand aufgefaßt werden, was die Umkehrbarkeit des Vorgangs bei Änderung des Gleichgewichts in sich schließt. Von diesem Gesichtspunkt aus ist in der vorliegenden Arbeit geprüft worden, ob auch in der tätigen Niere eine derartige Umkehr beobachtet werden kann, und in der Tat ließ sich dabei der Beweis für diese Erscheinung führen. Es ist damit ein weiterer Beleg dafür erbracht, daß die physikalische Diffusion bei der Bildung eines konzentrierten Harnes nicht nur ein wesentliches, sondern geradezu das führende Moment darstellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01754551
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    Paper (German National Licenses)
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