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  • 1980-1984  (2)
  • 1982  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Relaxational behavior of birefringence of aqueous carboxymethylcellulose under an alternating electric field at frequencies ranging from 0.1 Hz to 100 kHz (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 20-26 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Carboxymethylcellulose ; electric birefringence ; optical anisotropy ; relaxation ; cluster
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The d. c. component of birefringence of aqueous carboxymethylcellulose (CMC) under an a. c. electric field was measured at frequencies ranging from 0.1 Hz to 100 kHz. Three samples of different molecular weights were studied with varying degree of neutralization, polymer concentration and added salt concentration. The dispersion curve of birefringence consists of three relaxation bands,A, B andC in order of decreasing frequency. RelaxationB with a negative relaxation strength is ascribed to end-over-end rotation of almost rodlike CMC molecules. RelaxationA with a positive strength is attributed to the relaxation of electrical polarizability along the minor axis of molecule. RelaxationC possesses also a positive strength and is induced by clusters of CMC molecules.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01447671
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Ultrastructural study of the childhood mitochondrial myopathic syndrome associated with lactic acidosis (1982)
    Springer
    European journal of pediatrics 139 (1982), S. 25-30 
    Details
    ISSN: 1432-1076
    Schlagwort(e): Mitochondrial myopathic symdrome ; Lactic acidosis ; Endothelium ; Ultrastructural study
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The quadriceps femoris muscle and the muscularis mucosae of the rectum from two children with mitochondrial myopathic syndrome associated with lactic acidosis were studied by electron microscopy. Striking morphological abnormalities of mitochondria were noted not only in the skeletal but also in the smooth muscle cells. Endothelial cells of blood capillaries distributed in these affected muscles were so greatly swollen that the capillary lumen was almost occluded. In contrast, surface epithelial and glandular epithelial cells of the rectum contained normal mitochondria, and fenestrated capillaries in the propria mucosae remained intact. Long-term ischemia resulting from occlusive changes of the capillary wall may be responsible for the mitochondrial alterations of muscle cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00442074
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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