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  • 1
    Electronic Resource
    Electronic Resource
    The sequence of a sea urchin muscle actin gene suggests a gene conversion with a cytoskeletal actin gene (1987)
    Springer
    Journal of molecular evolution 25 (1987), S. 37-45 
    Details
    ISSN: 1432-1432
    Keywords: Sea urchin ; Actin genes ; Gene conversion ; DNA sequence ; Muscle actin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We report the nucleotide sequence of the single muscle actin gene of the sea urchinStrongylocentrotus purpuratus. Comparison of the protein-coding sequence of this muscle actin gene (pSpG28) with that of two linked sea urchin cytoskeletal actin genes (pSpG17 and CyIIa) reveals a region of exceptional sequence conservation from codon 61 through codon 120. Furthermore, when silent nucleotide changes are compared, the conservation of this region is still evident (7.9% silent site differences in the conserved region vs 43.3% silent site differences in the rest of the gene when pSpG28 and CyIIa are compared), indicating that the conservation is not due to particularly stringent selection on the portion of the protein encoded by this region of the genes. These observations suggest that a gene conversion has occurred between the muscle actin gene and a cytoskeletal actin gene recently in the evolution of the sea urchin genome. Gene conversion between nonallelic actin genes may thus play a role in maintaining the homogeneity of this highly conserved gene family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02100039
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vegetation and soils of seminatural deciduous woods in northeast Ireland (1986)
    Springer
    Plant ecology 64 (1986), S. 67-74 
    Details
    ISSN: 1573-5052
    Keywords: Basalt ; Conservation ; Deciduous wood ; DECORANA ; PCA ; TWINSPAN ; Woodland soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seminatural deciduous woods associated mainly with basaltic escarpments were surveyed in northeast Ireland to investigate the relationships between soil physical and chemical characteristics and community composition. Gradients of floristic composition in the sample stands pointed to soil acidity, soil mineral nutrient status and the degree of soil waterlogging as principal factors influencing the ground flora. The physico-chemical characteristics of the woodland soils showed distinctive differences which were correlated with community composition, confirming the considerable effect of the soil environment. Soil texture was shown to be a key factor influencing the ground flora, mainly through its influence on soil water status and acidity. Better drained soils subject to minimal disturbance by people or physiographic processes, were found to have the highest content of water soluble nitrogen, available phosphorus and exchangeable potassium. An interaction between soils, site geomorphology and land use suggested that the value of the woods as controls against which the effects of agricultural land use on soils can be monitored, is limited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044782
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    Paper (German National Licenses)
    Fulltext
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