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  • 1
    Electronic Resource
    Electronic Resource
    A defective non-LTR retrotransposon is dispersed throughout the genome of the silkworm, Bombyx mori (1994)
    Springer
    Chromosoma 103 (1994), S. 311-323 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The presence of long repetitive sequences is demonstrated in the genome of the silkworm, Bombyx mori. Members of this BMC1 family reveal several features typical of the L1 (long interspersed sequence one) family of mammals, except for species specific elements. The number of BMC1 elements is estimated to be approximately 3500 per haploid genome. Elements containing the full length unit of 5.1 kb are dispersed throughout the genome and their restriction sites are conserved, although most members are preferentially truncated to varying extents at their 5′ ends. DNA sequencing indicates that this element contains six tandem repeats of 15 bp CpG-rich sequence in the 5′ proximal region. It terminates with a 3′ oligo(A) stretch, and is flanked at both ends by a 7–10 bp target sequence duplication. In addition, there is significant evidence for amino acid sequence homology with reverse transcriptase domains of other L1 families, especially F, Doc and lockey of Drosophila melanogaster. No large open reading frame is present. The BMC1 element is suggested to be dispersed in the genome by a transposition mechanism involving RNA intermediates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00417878
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A defective non-LTR retrotransposon is dispersed throughout the genome of the silkworm, Bombyx mori (1994)
    Springer
    Chromosoma 103 (1994), S. 311-323 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The presence of long repetitive sequences is demonstrated in the genome of the silkworm, Bombyx mori. Members of this BMC1 family reveal several features typical of the L1 (long interspersed sequence one) family of mammals, except for species specific elements. The number of BMC1 elements is estimated to be approximately 3500 per haploid genome. Elements containing the full length unit of 5.1 kb are dispersed throughout the genome and their restriction sites are conserved, although most members are preferentially truncated to varying extents at their 5′ ends. DNA sequencing indicates that this element contains six tandem repeats of 15 bp CpG-rich sequence in the 5′ proximal region. It terminates with a 3′ oligo(A) stretch, and is flanked at both ends by a 7–10 bp target sequence duplication. In addition, there is significant evidence for amino acid sequence homology with reverse transcriptase domains of other L1 families, especially F, Doc and Jockey of Drosophila melanogaster. No large open reading frame is present. The BMC1 element is suggested to be dispersed in the genome by a transposition mechanism involving RNA intermediates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00417878
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Experimental investigations of shear and elongational flow properties of polystyrene melts reinforced with calcium carbonate, titanium dioxide, and carbon blackPresented at the American Chemical Society Rubber Division Meeting Atlanta, Georgia(March 1979). (1980)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 20 (1980), S. 949-956 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Shear and elongational flow measurements on polystyrene melts reinforced with small particles were carried out. The influences of loading level, particle size and surface treatment on shear viscosity, principal normal stress difference, and elongational viscosity were discussed. These systems exhibited yield values for both shear and elongational flow. Experimental values for the ratio of the tensile to the shear yield stress give satisfactory agreement with the predictions of the von Mises yield criterion. The yield value appears to increase with decreasing particle size and may be varied with surface treatment. The principal normal stress difference at fixed shear stress decreases with volume loading of particulates. The results are interpreted in terms of a system forming a gel due to interparticle forces, which is disrupted by a critical distortional strain energy.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760201406
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Elongational flow and melt-spinning instability of concentrated suspensions of small particles in polymer melts (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 579-589 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It is suggested that the existence of yield values in the elongational viscosity of concentrated suspensions of small particles in polymer melts leads to enhanced instability of uniaxial stretching and melt-spinning behavior. This is supported by analyses of filament stability. Severe instabilities are found in experiments on both simple stretching and melt spinning of filaments of suspensions of carbon black, titanium dioxide, and calcium carbonate in polystyrene. Necking and low elongations to break are observed in the former case. The melt-spinning results show “draw resonance” occurring at low drawdown ratios and high amplitudes of disturbances in the unstable region.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260217
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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