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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of 3,4-dihydro-3,3-dimethyl-1(2H)-acridinone (1995)
    Springer
    Journal of chemical crystallography 25 (1995), S. 201-203 
    Details
    ISSN: 1572-8854
    Keywords: Acridinone ; alzheimer ; dimedone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The acridinone derivative 3,4-dihydro-3,3-dimethyl-1(2H)-acridinone (4) has been prepared in a two step fashion and the molecular structure confirmed by X-ray diffraction. Compound4 crystallizes in the space group P2l/n witha=6.022(2),b=21.111(2),c=9.604(2) Å, β=99.97(2)°, andZ=4. The single crystal analysis showed the acridinone tricyclic ring is virtually planar except in the gem-dimethyl position of C(3) which presented a half-chair conformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01666107
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  • 2
    Electronic Resource
    Electronic Resource
    Mating behavior and mate recognition pheromone blocking of male receptors in Brachionus plicatilis Müller (Rotifera) (1995)
    Springer
    Hydrobiologia 313-314 (1995), S. 105-110 
    Details
    ISSN: 1573-5117
    Keywords: behavior ; mating ; pheromone ; receptors ; rotifers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Copulatory behavior of three S and three L type B. plicatilis strains from different geographic areas was analyzed. A 29 KD surface glycoprotein on females, characterized as a Mate Recognition Pheromone (MRP), binds to receptors in the corona of males and blocks mate recognition. Blocking was observed in all S and L strains even though the MRP was isolated from a single L-type strain. Binding was quantified using image analysis and a 20-fold difference was observed among strains. A direct relationship between the male discrimination of females and the intensity of MRP binding to male receptors was found. This relationship might be useful as a tool to examine variation in the mate recognition systems of other rotifer species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025937
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  • 3
    Electronic Resource
    Electronic Resource
    Cross-mating tests re-discovered: a tool to assess species boundaries in rotifers (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 109-115 
    Details
    ISSN: 1573-5117
    Keywords: behavior ; mating ; evolution ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The recent isolation of a mate recognition pheromone in the marine rotifer Brachionus plicatilis Müller has shed new light on the mate recognition system of rotifers. One result is improved understanding of the importance of mating behavior as a highly efficient process used by rotifers to choose conspecifics. There are many differences in the main characteristics of mating behavior in members of five different families of rotifers. The present work describes the use of these characteristics to assess species boundaries, especially where boundaries between two or more species are unclear. The method proposed here can assess quantitatively the response of males of one species to females of a questionable taxon by measuring the percentage of matings initiated and the number of completed copulations. The data generated can then be used together with molecular, morphological, and other data to determine the species boundaries. This approach can help distinguish between morphological differences resulting from evolutionary divergence of species and morphological differences induced by environmental or ecological factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017005602735
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  • 4
    Electronic Resource
    Electronic Resource
    Cross-mating tests re-discovered: a tool to assess species boundaries in rotifers (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 109-115 
    Details
    ISSN: 1573-5117
    Keywords: behavior ; mating ; evolution ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The recent isolation of a mate recognition pheromone in the marine rotifer Brachionus plicatilis Müller has shed new light on the mate recognition system of rotifers. One result is improved understanding of the importance of mating behavior as a highly efficient process used by rotifers to choose conspecifics. There are many differences in the main characteristics of mating behavior in members of five different families of rotifers. The present work describes the use of these characteristics to assess species boundaries, especially where boundaries between two or more species are unclear. The method proposed here can assess quantitatively the response of males of one species to females of a questionable taxon by measuring the percentage of matings initiated and the number of completed copulations. The data generated can then be used together with molecular, morphological, and other data to determine the species boundaries. This approach can help distinguish between morphological differences resulting from evolutionary divergence of species and morphological differences induced by environmental or ecological factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017005602735
    Location Call Number Expected Availability
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    Paper (German National Licenses)
    Fulltext
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