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  • ATOMIC AND MOLECULAR PHYSICS  (2)
  • sperm structural anomalies  (1)
  • Nuclear reactions
  • 1980-1984  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Calmodulin intracelluar concentration and cAMP-dependent protein kinase activity in human sperm samples in relation to sperm motphlogy and motlity (1983)
    New York, NY : Wiley-Blackwell
    Gamete Research 8 (1983), S. 171-182 
    Details
    ISSN: 0148-7280
    Keywords: calmodulin ; cAMP-dependent protein kinases ; sperm structural anomalies ; cell motility ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Calmodulin concentration and cAMP-dependent protein kinase activity have been determined in human sperm samples. No significant differences have been noticed in the motility index of two groups of sperm samples differing in their intracellular concentration of calmodulin. It was however found that a low intracellular clamodulin concentration is frequently associated with particular anomalies of the head and tail region. In contrast, a positive correlation has been demonstrated between the motility index and the whole extractable cAMP-dependent protein activity of the different sperm samples. In suspension s, When the cAMP-dependent protein kinase activity was measured on intact sperm suspensions, a positive correlation between the activity and the motility index was also found.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120080206
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    Paper (German National Licenses)
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  • 2
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    Diffusion and viscosity coefficients for helium (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The first order Boltzmann-Fokker-Planck equation is solved numerically to obtain diffusion and viscosity coefficients for a ternary gas mixture composed of electron, protons, and helium. The coefficients are tabulated for five He/H abundances ranging from 0.01 to 10 and for both He II and He III. Comparison with Burgers's thermal diffusion coefficients reveals a maximum difference of 9-10% for both He II and He III throughout the range of helium abundances considered. The viscosity coefficients are compared to those of Chapman and Cowling and show a maximum difference of only 5-6% for He II but 15-16% for He III. For the astrophysically important gas mixtures, it is concluded that the results of existing studies which employed Burgers's or Chapman and Cowling's coefficients will remain substantially unaltered.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal; vol. 252
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Computations of ion diffusion coefficients from the Boltzmann-Fokker-Planck equation (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Boltzmann-Fokker-Planck equation is solved with the Chapman-Enskog method of analysis for the velocity distribution functions of helium, carbon, nitrogen, and oxygen. The analysis is a perturbation scheme based on the assumption of a collision-dominated gas, and the calculations are carried out to first order. The elements considered are treated as trace constituents in an electron-proton gas. From the resulting distribution functions, diffusion coefficients are computed which are found to be 20-30% less than those obtained by Chapman and Burgers. In addition, it is shown that the return current of cold electrons needed to maintain quasi-neutrality in a plasma with a temperature gradient contributes a term in the thermal diffusion coefficient omitted erroneously in previous works. This added term resolves the longstanding controversy over the discrepancy between the coefficients of Chapman and Burgers, which are seen to be completely equivalent in the light of this analysis. The viscosity coefficient for an electron-proton gas is also computed and found to be 7% less than that obtained by Braginskii.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal; vol. 243
    Format: text
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    NASA TECHNICAL REPORTS
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