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  • 1
    Electronic Resource
    Electronic Resource
    A finite element analysis of the large plastic deformation behavior of amorphous glassy circular polymeric bars (1997)
    Springer
    Acta mechanica solida Sinica 10 (1997), S. 138-147 
    Details
    ISSN: 0894-9166
    Keywords: BPA molecular network model ; finite element formulation ; amorphous glassy circular polymeric bars ; deformation localization development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The BPA eight-chain molecular network model is introduced into the finite element formulation of elastic-plastic large deformation. And then, the tensile deformation localization development of the amorphous glassy circular polymeric bars (such as polycarbonates) is numerically simulated. The simulated results are compared with experimental ones, and very good consistence between numerical simulation and experiment is obtained, which shows the efficiency of the finite element analysis. Finally, the influences of the microstructure parameterS ss on tensile neck-propagation and triaxial stress effect are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207741
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of the type I cellular retinoic acid-binding protein mutants and their biological activities (1999)
    Springer
    Molecular and cellular biochemistry 200 (1999), S. 69-76 
    Details
    ISSN: 1573-4919
    Keywords: CRABP-I ; RA induction ; RA binding ; mutagenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract We have mutated the type I cellular retinoic acid binding protein (CRABP-I), individually at the Arg131 (into Ala) and the Tyr 133 (into Phe) residues which have been predicted to make direct contact with retinoic acid (RA) based upon previous structural studies. The RA-binding affinities of these mutants are examined and their biological effects on RA induction of reporter genes are determined. The R131A mutation drastically affects its ligand-binding property, but the Y133F mutation has little effect. By using an RA-inducible reporter, it is found that the wild type CRABP-I exerts biphasic effects on RA induction of the reporter. The early (at 12 h) effect is to enhance RA induction, whereas the delayed (at 24 h) effect is to suppress RA induction. In consistence with their RA binding property, the R 131A mutant loses both its early and delayed biological activities, whereas the Y133F mutant remains as effective as the wild type. It is concluded that CRABP-I over-expression exerts biphasic effects on RA-mediated gene expression, and that Arg131, but not Tyr 133, is essential for a high RA-binding affinity of this protein as well as its biological activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006906415388
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    Paper (German National Licenses)
    Fulltext
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