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  • Electronic Resource  (2)
  • 05C38  (1)
  • sectt.Dileptium  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Hereditary modular graphs (1988)
    Springer
    Combinatorica 8 (1988), S. 149-157 
    Details
    ISSN: 1439-6912
    Keywords: 05C38
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In a hereditary modular graphG, for any three verticesu, v, w of an isometric subgraph ofG, there exists a vertex of this subgraph that is simultaneously on some shortestu, v-path,u, w-path andv, w-path. It is shown that the hereditary modular graphs are precisely those bipartite graphs which do not contain any isometric cycle of length greater than four. There is a polynomial-time algorithm available which decides whether a given (bipartite) graph is hereditary modular or not. Finally, the chordal bipartite graphs are characterized by forbidden isometric subgraphs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02122796
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    Paper (German National Licenses)
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  • 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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