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  • 1
    Electronic Resource
    Electronic Resource
    Testing balancedness and perfection of linear matrices (1993)
    Springer
    Mathematical programming 61 (1993), S. 1-18 
    Details
    ISSN: 1436-4646
    Keywords: Combinatorial optimization ; (0, 1) matrices ; integrality of polyhedra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract A (0, 1) matrix is linear if it does not contain a 2×2 submatrix of all ones. In this paper we give polynomial algorithms to test whether a linear matrix is balanced or perfect. The algorithms are based on decomposition results previously obtained by the authors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01582135
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  • 2
    Electronic Resource
    Electronic Resource
    The pigmentary system of planaria (1979)
    Springer
    Cell & tissue research 199 (1979), S. 197-202 
    Details
    ISSN: 1432-0878
    Keywords: Pigmentary system ; Planaria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pigmentary system of the planaria, Dugesia gonocephala s.l. (Platyhelminthes, Turbellaria, Tricladida), has been studied by light and electron microscopy. The system consists of granules contained in chromatophore-like cells embedded in the parenchyma. The cell processes penetrate between the muscle layers and extend to the sub-epidermal basal lamina. The nature of the pigment and the comparative anatomical significance of the chromatophore structure is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236131
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  • 3
    Electronic Resource
    Electronic Resource
    The pigmentary system of planaria (1979)
    Springer
    Cell & tissue research 199 (1979), S. 203-211 
    Details
    ISSN: 1432-0878
    Keywords: Pigmentary system ; Planaria ; MIF ; Hormonal regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pigmentary system of the planaria, Dugesia gonocephala s.l. (Platyhelminthes, Turbellaria, Tricladida), consists of granules contained in chromatophore cells distributed in the parenchyma tissue. The administration of MSH release-Inhibiting Factor (M.I.F.) leads to an easily observable general decolouration of the animal due to the migration of the pigment granules towards the deeper-lying cell nucleus. In planarians bisected transversely through the pharyngeal region, the decolouration occurs only in the cephalic segment, and the caudal segment remains dark. When, however, the decapitated caudal segment regenerates a head region, a decolouration response occurs when exposed to M.I.F. The significance of these results is discussed, and an hypothesis on the hormonal regulation of the pigmentary system is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236132
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