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  • 1980-1984  (3)
  • 1980  (3)
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  • 1980-1984  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    American Ginseng. II. Analysis of Ginsenosides and Their Sapogenins in Biological Fluids (1980)
    s.l. : American Chemical Society
    Journal of natural products 43 (1980), S. 463-466 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50010a005
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Preliminary results of the sheehan total knee prosthesis (1980)
    Springer
    International orthopaedics 4 (1980), S. 67-71 
    Details
    ISSN: 1432-5195
    Keywords: Sheehan knee prosthesis ; Knee
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs présentent une revue de 50 genoux, chez 42 malades, opérés entre août 1973 et novembre 1976. Après de bons résultats initiaux, sont apparus divers problèmes. Les complications provenant de fautes dans le dessin de la prothèse, dans le choix des malades et du fait d'obstacle techniques sont analysées. Ce type de prothèse ne convient pas aux malades dont les genoux sont très instables et déformés. La crête médiane de polyéthylène à haute densité de la pièce tibiale n'est pas suffisamment forte pour résister aux contraintes en valgus ou en varus. La correction totale du valgus, du varus ou du flessum est essentielle pour éviter les complications tardives. La déformation associée en rotation externe des genoux ayant un important valgus doit être totalement corrigée si l'on veut éviter la survenue d'une luxation de la rotule. En conclusion, à l'heure actuelle, les prothèse avec et sans charnière ont toutes deux une place dans l'arthroplastie totale du genou.
    Notes: Summary A review of 50 knees in 42 patients operated upon between August, 1973 and November, 1976 is presented. Following initial good results, problems have been encountered with the passage of time. Complications due to design faults, selection, and technical pitfalls are analysed. Patients who have grossly unstable and deformed knees are not suitable for this type of prosthesis. The high density polyethylene central flange in the tibial component is not strong enough to withstand valgus or varus forces. Full correction of valgus, varus, or flexion deformities is essential if late complications are to be avoided. Associated external rotation deformities in grossly valgus knees have to be fully corrected to prevent late dislocation of the patella. Our conclusion is that at present there is a place for both the hinged and hingeless type of prosthesis in total knee replacement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266606
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Fickian diffusion of alkanes through glassy polymers: Effects of temperature, diffusant size, and polymer structure (1980)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 20 (1980), S. 40-50 
    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: Diffusivities D ranging over six orders of magnitude with values as low as 2 × 10-13 cm2/s have been obtained by a recently developed permeation apparatus, employing a gas-flow method and a flame ionization detector; Log D for hydrocarbons in bisphenol-A polycarbonate (PC) at 120°C is proportional to the square of the molecular diameter (d2) as given by the Lennard-Jones 6-12 potential. This correlation holds even for the nonspherical n-hexane molecule. The activation energy for diffusion is also linearly related to d2, with values of 9.5 and 23 kcal/mol for methane and neopentane in PC, respectively. Comparison of PC with two similar polymers of higher glass-transition temperatures (Tg) indicates that our diffusion data do not correlate with the Tg of these polymers. The presence of subsidiary transitions, however, appears to enhance segmental mobilities, increasing the rate of diffusion of the hydrocarbons. The thermodynamic solubility of alkanes in glassy PC can be directly related to their boiling points, and in addition, their enthalpy of solution is linearly related to the heat of condensation of these permeants.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760200108
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    Paper (German National Licenses)
    Fulltext
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