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  • 1990-1994  (4)
  • Gene expression  (2)
  • material functions  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Generalized Cole-Cole behavior and its rheological relevance (1992)
    Springer
    Rheologica acta 31 (1992), S. 309-322 
    Details
    ISSN: 1435-1528
    Keywords: Linear-viscoelasticity ; material functions ; rheological constitutive equation ; fractional derivative
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00418328
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The ADP/ATP translocator from potato has a long amino-terminal extension (1991)
    Springer
    Current genetics 20 (1991), S. 405-410 
    Details
    ISSN: 1432-0983
    Keywords: ADP/ATP translocator ; Mitochondria ; Presequence ; Gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ADP/ATP translocator is an abundant protein of the mitochondrial inner membrane, which in fungi and mammals is synthesized without a presequence. Here we report that the translocator from potato has an amino-terminal extension which may function in mitochondrial targeting. Several cDNA clones encoding the nucleotide sequence of the ADP/ATP translocator have been isolated from potato leaf and tuber cDNA libraries constructed in lambda phages. Only one class of cDNA clones was found but possibly different translocator genes are expressed in other tissues. High levels of transcripts for the translocator are found in all tissues analysed. Sequence determination of the complete insert of one of the clones reveals a long open reading frame of 1158 bp encoding a protein of 386 amino acids corresponding to a calculated molecular weight of 42 kDa. In contrast, the ADP/ATP translocator proteins from fungi and mammals are significantly smaller. Comparison of the Neurospora translocator with the potato protein shows about 75% sequence homology, being confined to the region after amino acid 85 of the potato polypeptide. Antibodies directed against the fungal translocator recognize a protein of 30 kDa in the inner membrane of potato mitochondria, suggesting that the mature protein has a similar size as the translocators from fungi and mammals. Thus, the additional segment of the potato ADP/ATP translocator forms an amino-terminal extension which may be involved in the import of the protein into plant mitochondria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317069
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: Cytochrome c 1 ; Solanum tuberosum ; Mitochondria ; Protein import ; Gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279794
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Linear viscoelastic behaviour of complex polymeric materials: a fractional mode representation (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 1536-1546 
    Details
    ISSN: 1435-1536
    Keywords: Rheological constitutive equation ; fractional derivatives ; material functions ; relaxation time spectra ; retardation time spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A rheological constitutive equation for complex polymeric materials is derived starting from a special formulation of the relaxation function. This relaxation function contains six parameters and is divided into three regions: the plateau region, an intermediate power-law region and the terminal region of rapid stress decay. Material functions like the complex modulusG * and the logarithmic density function of the relaxation time spectrum H and of the retardation time spectrum L respectively are derived. Material parameters like the zero shear viscosityη 0 and the equilibrium shear complianceJ e are also calculated. The comparison of the measured dynamic moduli of H-shaped polystyrenes, associating terminally functionalized polyisoprenes and randomly associating polybutadienes with the theoretical predictions of the proposed phenomenological model shows an excellent agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00664721
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    Paper (German National Licenses)
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