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  • 1990-1994  (2)
  • 1992  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Generalized Cole-Cole behavior and its rheological relevance (1992)
    Springer
    Rheologica acta 31 (1992), S. 309-322 
    Details
    ISSN: 1435-1528
    Schlagwort(e): Linear-viscoelasticity ; material functions ; rheological constitutive equation ; fractional derivative
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract Starting from an analysis of the rheological behavior of the complex modulus predicted by the Cole-Cole formalism, a generalized Cole-Cole ansatz is suggested in order to overcome the related difficulties. The corresponding rheological constitutive equation with fractional derivatives belonging to the generalized Cole-Cole respondance is stated and the characteristic material functions of the linear viscoelasticity theory (like the dynamic modulus and compliance, the relaxation and ratardation functions, the spectra, etc.) are derived. Model predictions of these functions will be compared with experimental results from dynamical measurements and creep data on different polymer systems which show cooperative phenomena (polymeric glasses and gelling systems). One can see that the modified ansatz fits the data very well, in spite of its relative simplicity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00418328
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Cytochrome c1 from potato: a protein with a presequence for targeting to the mitochondrial intermembrane space (1992)
    Springer
    Molecular genetics and genomics 231 (1992), S. 217-225 
    Details
    ISSN: 1617-4623
    Schlagwort(e): Cytochrome c 1 ; Solanum tuberosum ; Mitochondria ; Protein import ; Gene expression
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Here we report the primary structure of potato cytochrome c 1, a nuclear-encoded subunit of complex III. Using heterologous antibodies directed against cytochrome c 1 from yeast two types of clones were isolated from an expression library, suggesting that at least two different genes are present and expressed in the genome. Northern blot analysis reveals that slightly varying levels of cytochrome c 1 transcripts are present in all potato tissues analysed. A 1304 bp insert of one of the cDNA clones (pC13II) encodes the entire 320 amino acids of the precursor protein corresponding to a molecular weight of 35.2 kDa. As revealed by direct amino acid sequence determination of the cytochrome c 1 protein another cDNA clone (pC18I) encodes the major form of cytochrome c 1 present in potato tuber mitochondria. Western blots of subfractionated potato mitochondria show that the mature protein present in the membrane fraction is smaller than the pC13II encoded protein synthesized in Escherichia coli. The transient presequence of the protein is 77 amino acids long and has a bipartite polarity profile characteristic of presequences involved in targeting to the intermembrane space of fungal mitochondria. It consists of a positively charged NH2-terminal part which resembles “matrix targeting domains” and an adjacent hydrophobic region showing sequence similarities to “intramitochondrial sorting domains”. The amino-terminal region of potato cytochrome c 1 is the first presequence of a plant protein of the mitochondrial intermembrane space to be determined and may be useful in the study of intramitochondrial sorting in plants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00279794
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