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  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Evolution of zinc finger-Y and zinc finger-X genes in oryzomyne-akodontine rodents (Cricetidae) (1992)
    Springer
    Journal of molecular evolution 34 (1992), S. 54-61 
    Details
    ISSN: 1432-1432
    Keywords: Zfy-Zfx genes ; Gene evolution ; Oryzomyne-akodontine rodents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Zinc finger-Y (Zfy) and zinc finger-X (Zfx) genes were analyzed by Southern blotting in male and female specimens of 10 species belonging to the oryzomyne-akodontine stock of Cricetidae rodents. DNA fragments were used as characters to construct a parsimony tree of the genes. Zfx and Zfy trees in general coincide with the evolutionary history of the taxa. Both trees show Oryzomys longicaudatus genes as the outgroup whereas Akodon xanthorrhinus genes are also distant from those of the other species. Oxymycterus rufus and Bolomys obscurus share related sequences, while genes from the other six Akodon species form a group of their own. It was found that 9 out of the 10 species analyzed show Zfy amplification in a range varying from 2 to 24 copies and with a pattern that is clade specific. The estimation of the average changes per character strongly suggests that Zfy has evolved more rapidly than Zfx; our estimates of the rate of nucleotide substitution are 4.6 times higher for Zfy than for Zfx.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163852
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of the heterochromatin in moose (Alces alces) chromosomes (1990)
    Springer
    Genetica 80 (1990), S. 1-7 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The karyotype of moose (2n=68) is characterized by very large C-bands close to the centromeres of most chromosomes. The C-banded material represents 40% of the genome. For further characterization of the heterochromatin chromosome spreads were treated with restriction endonucleases and the restriction enzyme (Re) banding pattern was analysed. HaeIII, AluI, MboI, RsaI and HinfI produced informative Re-bands. DdeI induced an even digestion with no banding. Staining with chromomycin A3 produced bright fluorescence in regions corresponding to C-bands. Labeling with BrdUrd during late S phase differentiates four regions in the C banded area. The sequence of these regions from centromere to telomere are: late, early, late and early replicating. The authors propose the existence of five satellite DNA families with distinctive characteristics of G-C and A-T richness and different replication timing, and point out the different clusters for the endonucleases detailed above and their varying location in the chromosomes examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120114
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Compositional influence on toughness of structural acrylic adhesives (1991)
    Springer
    Journal of materials science 26 (1991), S. 434-440 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The fracture behaviour and toughness of modified acrylic adhesives, based on mixtures of various acrylic monomers and rubbers polymerized by a radical mechanism have been investigated. The influence of the matrix and rubber composition on bulk morphology and mechanical properties is analysed by means of transmission and scanning electron microscopy, and dynamic-mechanical measurements. Both microtexture of the material and resin-rubber compatibility have been found to significantly influence the fracture behaviour in tension-impact tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00576539
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    Paper (German National Licenses)
    Fulltext
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