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  • 1
    Electronic Resource
    Electronic Resource
    Compositional Implications of the Spectral Behaviour of the Martian Surface (1969)
    [s.l.] : Nature Publishing Group
    Nature 222 (1969), S. 132-136 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The visible and infrared spectra of Mars have been compared with the laboratory spectra of certain minerals. The results allow some tentative conclusions to be drawn about the nature of the surface of the red ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/222132a0
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  • 2
    Electronic Resource
    Electronic Resource
    Comments on ‘lunar thermal anomalies and internal heating’ by J. M. Saari (1969)
    Springer
    Astrophysics and space science 4 (1969), S. 370-372 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00661826
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  • 3
    Electronic Resource
    Electronic Resource
    Lanthanide-ion transport across phospholipid vesicular membranes: a comparison of alamethicin 30 and A23187 using1H-NMR spectroscopy (1982)
    Springer
    Bioscience reports 2 (1982), S. 921-928 
    Details
    ISSN: 1573-4935
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The kinetics of Pr3+ transport by the ionophores alamethicin 30 and A23187 across unilamellar phospho-lipid vesicular membranes has been compared by following the time-dependent changes in the1H-NMR spectrum of the vesicles. The measured rates of transport allow stoichiometries of the transporting species to be deduced which are consistent with channel- and carrier-mediated mechanisms respectively. The method provides a useful complement to planar bilayer conductivity studies of these systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01114899
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  • 4
    Electronic Resource
    Electronic Resource
    Phosphatidic acid regulates the activity of the channel-forming ionophores alamethicin, melittin, and nystatin: A1H-NMR study using phospholipid membranes (1984)
    Springer
    Bioscience reports 4 (1984), S. 403-413 
    Details
    ISSN: 1573-4935
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The regulation of ion channels by phosphatidic acid (a proposed active metabolite in the phosphatidylinositol effect) was investigated using1H-NMR spectroscopy and small unilamellar phospholipid vesicles. Transport across egg-yolk phosphatidylcholine (egg PC) and dipalmitoyl phosphatidylcholine (DPPC) vesicular membranes in the presence of the channel-forming ionophores alamethicin, melittin, and nystatin was monitored using the lanthanide probe ion Pr3+. In the absence of the ionophores, phosphatidic acid (PA) alone was found to have no ionophore properties, but in the presence of the ionophores the incorporation of 3 mol % phosphatidic acid in the bilayer markedly increased the rate of transport using melittin and nystatin, but decreased the rate using alamethicin, independent of the type of phosphatidylcholine used. The presence of PA in the bilayer also stimulated the production of lyric type channels, the extent of which were both ionophore- and lipid-dependent. These results are discussed in terms of possible molecular interactions between the PA, the individual ionophores, and type of lipid used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01122505
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  • 5
    Electronic Resource
    Electronic Resource
    Laminar and turbulent radial jets (1998)
    Springer
    Acta mechanica 127 (1998), S. 25-38 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this paper the radial free jet which is produced by a continuous discharge of fluid from the space between two identical, parallel, circular, concentric discs into an infinite region of stagnant fluid of the same density and viscosity is investigated. Both laminar and turbulent jets are considered with analytical solutions being obtained near to the origin of the jet and at large distances along the jet. These asymptotic solutions are matched using a computational technique, and the numerical predictions show very good agreement with all the available experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01170360
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