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  • 1990-1994  (8)
  • 1
    Electronic Resource
    Electronic Resource
    A large tumour from the gray snapper, Lutjanus griseus (L.) (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 13 (1990), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Using a panel of special stains employed in human histopathology and immunohistology, the authors diagnosed a tumour from the common gray snapper, Lutjanus griseus (L.), as a myoma, Only a few such tumours have been previously reported from fishes. Gray snapper are readily available and may provide a model for basic studies on this, as well as other, types of tumour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1990.tb00787.x
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  • 2
    Electronic Resource
    Electronic Resource
    Embryological and molecular investigations of parental imprinting on mouse chromosome 7 (1991)
    [s.l.] : Nature Publishing Group
    Nature 351 (1991), S. 667-670 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We investigated the developmental potential of cells carrying the paternal duplication of the region distal to the T(7B3; 15C)9H translocation breakpoint on Chr? (ref. 7) in chimaeras. Blastocysts carrying the paternal duplication of distal Chr 7 (PatDi7) were expected at a frequency of about 17% ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/351667a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The deformation and failure behaviour of wheat starch plasticized with water and polyols (1993)
    Springer
    Journal of materials science 28 (1993), S. 5937-5942 
    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 mechanical properties of starch plasticized with water and glycerol or xylitol have been studied in flexure at room temperature. The addition of a polyol lowers the glassy modulus and the glass transition temperature of the starch. With the addition of polyols, the fall in modulus with increasing water content at the glass transition becomes less sharp and shifts to lower water contents. The high strain deformation shows that all samples fracture at a water content below 10% (wet weight basis), a proportion of which tears at water contents in the range 9%–10% and no fracture occurs in samples above about 10% water. Microscopy shows that there is evidence of permanent plastic deformation in fractured samples as the water content is increased to 10% water, although there is a negligible change in fracture stress and strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365204
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Deformation and fracture behaviour of wheat starch plasticized with glucose and water (1991)
    Springer
    Journal of materials science 26 (1991), S. 1351-1356 
    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 mechanical properties of wheat starch and the effects of plasticizers upon them are studied in flexure at 293 K. For compositions low in water and glucose the material is glassy, with a flexural modulus between 0.7 and 5.0 GPa. The addition of water and glucose to wheat starch plasticizes the material through its glass transition into a rubbery state. The flexural moduli of the rubbery samples are in the range 50 to 200 MPa, which is indicative of a partially crystalline polymer. For starch-water mixtures the glass transition occur in the water content range 18 to 20%. The addition of glucose progressively shifts the glass transition to lower water contents. At strains below 0.04 brittle failure is only observed in the glassy samples. The surface morphology of the fractured samples shows features typical of pure synthetic glassy polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544476
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and mechanical properties of brittle starch foams (1992)
    Springer
    Journal of materials science 27 (1992), S. 1469-1474 
    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 mechanical properties of extrusion-cooked maize have been analysed according to the Gibson and Ashby models of closed cell foams. The data point to better agreement with the earlier model and indicate that the cell-face bending term is not negligible for foams with little draining into the cell edges. The shape of the cells in these maize foams changes with foaming conditions: non-equilibrium spherical cells with some anisotropy are formed at conditions of low moisture content or high temperature when the glass transition temperature, T g, is elevated. Polyhedral cells which show some draining of material into the cell edges are formed under the converse conditions when the T g is lower. The change from polyhedral to spherical cells is also accompanied by a change in amylose-lipid complex from the V to the metastable E type, as shown by X-ray diffraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542905
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The deformation of brittle starch foams (1990)
    Springer
    Journal of materials science 25 (1990), S. 4001-4007 
    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 There exists a theoretical model to describe the deformation of solid foams which relates the mechanical properties to the foam density and the cell-wall properties. Previous work has assumed that the wall properties are constant for a wide range of different density foams and can be characterized by the properties of the unfoamed material. In this paper we show that, when considering extruded starch foams, variation of the extrusion parameters in order to produce different bulk density foams has an effect on the cell-wall material: notably upon the crystallinity,T g and wall density. Therefore, both the bulk foam and cell-wall mechanical properties were measured in order to test the full theory. For the relative fracture stress, excellent agreement was found between the predicted power law behaviour and the experimental results. However, the power law for the relative modulus is larger than the predicted value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582472
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Electron-impact excitation of multiply-charged ions using energy loss in merged beams: e+Si3+ (3s2S1/2) → e+Si3+ (3p2P1/2, 3/2) (1991)
    Springer
    The European physical journal 21 (1991), S. S35 
    Details
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For the first time absolute total cross sections for electron-impact excitation of a multiply-charged ion have been measured using an electron-energy-loss technique. Measurements were made near threshold for the process e + Si3+ (3s2S1/2) → e + Si3+ (3p2P1/2,3/2) - 8.88 eV. The 10−15 cm2 measured cross section agrees with results of 7-state close coupling calculations to better than the ±20% (90% CL) total uncertainty of the measurements. Convoluting the theoretical curve with a Gaussian energy distribution indicates an energy width of 0.15 ≲ ΔE ≲ 0.20 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426247
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    A 2-d numerical study of intermeshing self-wiping screws in biopolymer extrusion (1991)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 31 (1991), S. 1157-1163 
    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: A knowledge of flow behavior is important in the study of laminar flow in twin-screw extrusion processes to predict the velocity distribution and to understand the mixing process. The flow of a power law fluid in self-wiping twin-screw extruders is examined using a two-dimensional finite element analysis of a mid-channel section of intermeshing screws. Theory is compared with experiment using food biopolymer and plastic materials. Comparisons showing overprediction of throughputs, but similarities in behavior, suggest that this model could provide an upper limit for melt conveying. For most of the throughput range examined, pumping of intermeshing self-wiping screws appears to be almost independent of the power law flow index of the melt extruded, but the value of the flow index determines the degree of influence intermeshing has on the overall pressure gradient generated in the extruder.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760311513
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