Articles by Author: Sadiek Rosenthal

Search results for Sadiek Rosenthal

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  1. Louisiana crayfish (<em>Procambarus clarkii</em>) (Crustacea: Cambaridae) in Kenyan ponds: non-target effects of a potential biological control agent for schistosomiasis

    Louisiana crayfish (<em>Procambarus clarkii</em>) (Crustacea: Cambaridae) in Kenyan ponds: non-target effects of a potential biological control agent for schistosomiasis

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The Louisiana crayfish (Procambarus clarkii) has been proposed as a biological control agent for the intermediate snail hosts (Bulinus and Biomphalaria spp.) of human schistosomes (Schistosoma haematobium and S. mansoni) in Kenya. Using laboratory and field experiments, we examined the...
  2. Comparing macrophyte herbivory by introduced Louisiana crayfish (<em>Procambarus clarkii</em>) (Crustacea: Cambaridae) and native Dytiscid beetles (<em>Cybister tripunctatus</em>) (Coleoptera: Dytiscidae), in Kenya

    Comparing macrophyte herbivory by introduced Louisiana crayfish (<em>Procambarus clarkii</em>) (Crustacea: Cambaridae) and native Dytiscid beetles (<em>Cybister tripunctatus</em>) (Coleoptera: Dytiscidae), in Kenya

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The omnivorous Louisiana crayfish, Procambarus clarkii, has caused significant changes to macrophyte communities worldwide and may have similar negative effects in Kenya if used as a biological control agent for snails harbouring human schistosomes. Here we examine how herbivory by...
  3. On Differences of Semi-Continuous Functions

    On Differences of Semi-Continuous Functions

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Extrinsic and intrinsic characterizations are given for the class DSC(K) of differences of semi-continuous functions on a Polish space K, and also decomposition characterizations of DSC(K) and the class PS(K) of pointwise stabilizing functions on K are obtained in terms...
  4. PASCALIAN TRIANGLES AND EXTENSIONS TO HEXAGONS

    PASCALIAN TRIANGLES AND EXTENSIONS TO HEXAGONS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Various properties of binomial coefficients , expressed in terms of patterns in the Fascal Triangle, are generalized in two directions. First, the properties are extended over all integer values values of n and r, adopting a natural definition...