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  • Congruity problem  (2)
  • DNA fingerprinting monogamy  (1)
  • Microvasculature  (1)
  • 1995-1999  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Detection of rotational and involutional symmetries and congruity of polyhedra (1996)
    Springer
    The visual computer 12 (1996), S. 193-201 
    Details
    ISSN: 1432-2315
    Keywords: Key words: Symmetry detection ; Congruity problem ; Algorithm design ; Graph theory ; Computational geometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: O (m 2) time and uses O(m) space, where m is the number of edges of the polyhedron. As this is the lower bound of the symmetry detection problem for the considered output form, our algorithm is optimal. We show that a slight modification of our symmetry detection algorithm can be used to solve the related conguity problem of polyhedra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01782322
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  • 2
    Electronic Resource
    Electronic Resource
    Detection of rotational and involutional symmetries and congruity of polyhedra (1996)
    Springer
    The visual computer 12 (1996), S. 193-201 
    Details
    ISSN: 1432-2315
    Keywords: Symmetry detection ; Congruity problem ; Algorithm design ; Graph theory ; Computational geometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We propose a simple and efficient general algorithm for determining both rotational and involutional symmetries of polyhedra. It requiresO(m 2) time and usesO(m) space, wherem is the number of edges of the polyhedron. As this is the lower bound of the symmetry detection problem for the considered output form, our algorithm is optimal. We show that a slight modification of our symmetry detection algorithm can be used to solve the related conguity problem of polyhedra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01782322
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic monogamy in the common loon (Gavia immer) (1997)
    Springer
    Behavioral ecology and sociobiology 41 (1997), S. 25-31 
    Details
    ISSN: 1432-0762
    Keywords: Key words Loon ; Parentage ; DNA fingerprinting monogamy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We conducted behavioral observations and genetic analysis on breeding pairs of common loons in the upper Great Lakes region from 1993 through 1995 to look for behavioral evidence of extrapair copulations (EPCs) and to determine parentage of young. Pairs remained close to each other (usually within 20 m) during the pre-laying period, leaving little opportunity for EPCs to occur. Males and females both maintained physical proximity by approaching each other when they became separated. Copulations were obvious but infrequent, occurring about once every other day during the pre-laying period. Multilocus DNA fingerprinting was consistent with behavioral findings: 58 young from 47 different families were all genetic offspring of parents that raised them. Perfect genetic monogamy (genetic parentage of young by parents that rear them) in loons might arise as a consequence of the need for vigorous territorial defense to prevent territorial takeover.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002650050360
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  • 4
    Electronic Resource
    Electronic Resource
    Production of an endothelial cell migratory signal in rat endometrium during early pregnancy (1995)
    Springer
    Cell & tissue research 279 (1995), S. 215-220 
    Details
    ISSN: 1432-0878
    Keywords: Endometrium ; Microvasculature ; Endothelial cell migration ; Progesterone ; Rat (Sprague Dawley)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Rat endometrial explants were cultured in a three-dimensional collagen/endothelial cell matrix to measure angiogenic activity, as represented by migration of vascular endothelial cells towards the explants. Minimal endothelial cell migratory activity was observed with endometrial explants taken during the four-day oestrous cycle and days 3 and 4 of pregnancy. In contrast, a surge of endothelial cell migration occurred in response to endometrial explants taken from day-5-pregnant rats. Activity was found in explants taken approximately 5 h prior to implantation, but returned to minimal levels by day 6 of pregnancy. Endothelial cell migration remained minimal in response to both implantation and intersite tissue explants taken from days 6 and 7 of pregnancy. Endometrium from ovariectomised rats produced no endothelial cell migratory activity as measured by this technique. However, near preimplantation levels of endothelial cell migratory activity could be induced in ovariectomised rat endometrium by administering progesterone for 72 hours. Oestrogen given in conjunction with progesterone had no additional effect. These results demonstrate the presence of an endometrial signal that controls endothelial cell migration, and demonstrate this activity can be induced by progesterone without the addition of oestrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300706
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