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  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Lubrication of selected salivary molecules and artificial salivas (1989)
    Springer
    Dysphagia 4 (1989), S. 95-100 
    Details
    ISSN: 1432-0460
    Keywords: Human saliva, lubrication ; Artificial saliva, lubrication ; Saliva, viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The lubrication regime displayed by human salivas (parotid and submandibular-sublingual), purified salivary molecules (the mucins MG1 and MG2 and α-amylases), and selected artificial salivas (Oracare D, Saliva Substitute, and Orthana) was assessed in vitro using a friction-testing device. Thin-film (boundary) lubrication was observed for all of the salivary samples and two of the artificial salivas examined. Oracare D, a glycerol-based artificial saliva, was the exception since it lubricated by a thick-film (hydrodynamic) regime. On a molar basis, the best lubricants of the purified salivary molecules were MG1 〉 MG2 ≈ nonglycosylated α-amylases ≈ glycosylated α-amylases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407152
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Propagating of sound and thermal waves in a reacting fluid (1987)
    Springer
    Astrophysics and space science 137 (1987), S. 1-15 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The propagation of linear sound and thermal waves in a reacting fluid, in which the heating and cooling processes can be represented by a heat-loss functionL(ρ, T, ξ is studied. A complex dispersion relation is found, from which the phase velocity and the scale length for damping (or amplification), of the above two-wave mode are calculated Wave amplification may occur in reacting locally stable fluids. Results are applied to a hydrogen plasma model assumed to be heated at a non-specified constant rate and cooled by recombination, excitation, and ionization by collisions, and free-free transitions. The phase velocity $$\tilde l$$ , the scale-length for damping $$\tilde \upsilon$$ , and the relevant relaxation times are calculated as functions of the dimensionless frequency $$\tilde \omega$$ , for temperatures ranging from those at which the hydrogen plasma is neutral to those at which it becomes completely ionized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00641615
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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