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  • Brassicaceae  (1)
  • median stabilization degree  (1)
  • sectt.Dileptium  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    The Median Stabilization Degree of a Median Algebra (1999)
    Springer
    Journal of algebraic combinatorics 9 (1999), S. 115-127 
    Details
    ISSN: 1572-9192
    Keywords: convex structure ; graphic cube ; median algebra ; median stabilization degree ; superextension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The median stabilization degree (msd, for short) of a median algebra measures the largest possible number of steps needed to generate a subalgebra with an arbitrary set of generators. We determine the value of msd of a graphic n-cube Qn and we derive an estimation of msd for the natural median operator of Rn which is sharp up to one or two units. Interestingly, msd of Qn and of Rn grows like log1.5n. Finally, we characterize median algebras and median graphs of msd ≤ 1 in terms of forbidden subspaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018689708341
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Systematics of AustralianLepidium species (Brassicaceae) and implications for their origin: Evidence from IEF analysis of Rubisco (1992)
    Springer
    Plant systematics and evolution 183 (1992), S. 99-112 
    Details
    ISSN: 1615-6110
    Keywords: Brassicaceae ; Lepidium ; sectt.Dileptium ; Monoploca ; Rubisco ; IEF ; systematics ; immigration ; long-distance dispersal ; Flora of Australia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Variation in subunit polypeptide composition of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) from native AustralianLepidium taxa was analyzed by isoelectric focusing (IEF). Species of grexMonoplocoidea on the one hand, and species of gregesPseudoruderalia andPapillosa on the other, were well separated by Rubisco IEF patterns. The protein data suggest grexMonoplocoidea to be placed in sect.Monoploca whereas gregesPseudoruderalia andPapillosa should be integrated into sect.Dileptium. We suggest that the Rubisco type of American and/or AsianLepidium species was contained in those plants migrating to Australia and evolving into the recent native Australian species. Fossil pollen records and vegetation history indicate that the origin ofLepidium in Australia was restricted to the late Tertiary of Quaternary. Data presented in this study fit best with an immigration by long-distance dispersal of seeds by birds from Asia and/or from South America.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937738
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    Paper (German National Licenses)
    Fulltext
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