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  • 1
    Electronic Resource
    Electronic Resource
    A tetraethylammonium-insensitive inward rectifier K+ channel in müller cells of the turtle (Pseudemys scripta elegans) retina (1994)
    Springer
    The journal of membrane biology 141 (1994), S. 239-245 
    Details
    ISSN: 1432-1424
    Keywords: Retina ; Glial cell ; Potassium channel ; Tetraethylammonium ; Patch clamp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Ion channels present in isolated glial (Müller) cells from the retina of the turtle (Pseudemys scripta elegans) were studied with the patch clamp technique. The predominant conductance in these cells was due to an inward rectifying potassium current. The whole-cell conductance of the inward rectifier was 20.2±1.9 nS (n = 7 cells) in a standard extracellular saline solution (3 mm extracellular potassium). This conductance was dependent on the extracellular potassium concentration, with a 2.88-fold change in conductance per tenfold shift in concentration. The relative permeability sequence to potassium of the inward rectifier was found to be: potassium (1.0) 〉 rubidium (0.7) 〉 ammonium (0.2) 〉 lithium (0.1) = sodium (0.1), which corresponded to the Eisenman sequence IV or V for a strongfield-strength potassium binding site on the channel. The single channel conductance measured in cell-attached patches with potassium chloride (150 mm) in the pipette was 68.5 ± 6.0 pS (n = 3 patches). The inward rectifier current was not blocked by extracellular tetraethylammonium (TEA+, 20 mm), but was blocked by extracellular barium (5 mm) or cesium (5 mm). The TEA+ insensitivity of the inward rectifier potassium channel in Müller cells is unusual, given that this type of channel in most excitable cells is sensitive to micromolar concentrations of this compound, and may be a characteristic of inward rectifier potassium channels that are primarily involved with extracellular potassium regulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235133
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  • 2
    Electronic Resource
    Electronic Resource
    Deuterium in the Galactic Centre as a result of recent infall of low-metallicity gas (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 405 (2000), S. 1025-1027 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Galactic Centre is the most active and heavily processed region of the Milky Way, so it can be used as a stringent test for the abundance of deuterium (a sensitive indicator of conditions in the first 1,000 seconds in the life of the Universe). As deuterium is destroyed in stellar ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35016506
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  • 3
    Electronic Resource
    Electronic Resource
    H 2 emission in the EUV spectrum of T Tauri and Burnham's nebula (1981)
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 34-36 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] T Tau is a pre-main-sequence star, with a photospheric absorption spectrum consistent with a spectral type of KO or K1 according to Kuhi3. It is embedded in nebulosity, from which characteristic low-excitation lines are observed in the visible region of the spectrum4. Emission from the v" = 1-0S(l) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/290034a0
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of complex molecules in TMC-1 (1983)
    [s.l.] : Nature Publishing Group
    Nature 301 (1983), S. 402-404 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] TMC-1 is a small (linear size 0.6 pc)6, dark (Av〉2.4 mag)7, quiescent, cold (T10K), disk-shaped cloud situated in, or near, Heiles' cloud 2 in the constellation of Taurus. It has proved a particularly rich source of interstellar molecules, including the cyanopolyynes, a complete list of which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/301402a0
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  • 5
    Electronic Resource
    Electronic Resource
    Preface (1995)
    Springer
    Astrophysics and space science 233 (1995), S. ix 
    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/BF00627324
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  • 6
    Electronic Resource
    Electronic Resource
    Carbon Chemistry in Oxygen-Rich Circumstellar Envelopes (1997)
    Springer
    Astrophysics and space science 251 (1997), S. 281-284 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000779327010
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  • 7
    Electronic Resource
    Electronic Resource
    On the contribution of grain surface reactions to interstellar molecule densities (1976)
    Springer
    Astrophysics and space science 44 (1976), S. 385-388 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some recent arguments concerning the relevance of grain surface reactions to interstellar molecule formation are shown to be without foundation. It is probable that surface reactions, gas phase ion-molecule and neutral reactions all contribute to interstellar molecular densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642525
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  • 8
    Electronic Resource
    Electronic Resource
    Large interstellar molecules (1977)
    Springer
    Astrophysics and space science 48 (1977), S. 243-248 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We propose that photocycloaddition reactions in molecular complexes in normal interstellar clouds will create unusually large molecules. These may be sufficiently radiation stable to be circulated with the interstellar gas, and so provide convenient nucleation centres for growth of loosely bound grains in dark regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648113
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  • 9
    Electronic Resource
    Electronic Resource
    A new model for interstellar dust (1979)
    Springer
    Astrophysics and space science 65 (1979), S. 69-82 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some physical, chemical and optical properties of mixed oxide grain material are discussed and the formation of such dust is examined. Surface chemistry on these grains may be responsible for the selective depletion of elements and for the formation of molecules such as H2CO in diffuse clouds. Spectra of mixed oxide grains yield features at 9.6 and 18 μm together with a broad band at 4.6 μm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643490
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  • 10
    Electronic Resource
    Electronic Resource
    Silicon chemistry in dense clouds (1980)
    Springer
    Astrophysics and space science 72 (1980), S. 509-517 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The equilibrium chemistry of silicon in dense interstellar clouds is discussed in terms of both gas phase and grain surface reactions. Unless the metal depletion is very large, the gas phase scheme tends to over-produce SiO and/or SiS when compared to the observations of Sgr B2. The scheme also predicts SiC to be an abundant form of silicon. There is a great need for relevant laboratory data on the reactions used here—of the 35 rate coefficients adopted in the scheme, only three have been measured in the laboratory. Reactions between positively charged gas phase ions and small grains can lead to the formation of SiO and SiS. This type of reaction seems to offer a simple explanation for the observed differences between sulphur and silicon chemistry in dense clouds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00639153
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