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  • 1985-1989  (30)
  • 1940-1944  (1)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Archaeopteryx, the primordial bird? (1986)
    [s.l.] : Nature Publishing Group
    Nature 324 (1986), S. 622-622 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-In view of the highly critical review of our book Archaeopteryx, The Primordial Bird: A Case of Fossil Forgery (Nature 324, 185; 1986) I would like to bring to your notice recent developments that would seem to have vindicated our views. The issue hinges on whether or not the material on which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/324622e0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Evolution of the Stars (1940)
    [s.l.] : Nature Publishing Group
    Nature 146 (1940), S. 97-98 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PROF. GAMOW appears to agree with our view that accretion of hydrogen by the stars from the cosmical cloud would be important if the rate were sufficiently rapid to compensate the transmutation of hydrogen within the stars. He believes, however, that the accretion rate is too low for this to be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/146097b0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The case for interstellar micro-organisms (1985)
    Springer
    Astrophysics and space science 110 (1985), S. 401-404 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent arguments claiming to disprove the existence of bacteria in interstellar space are shown to be without merit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653687
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    An object within a particle of extraterrestrial origin compared with an object of presumed terrestrial origin (1985)
    Springer
    Astrophysics and space science 113 (1985), S. 209-210 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Filamentary objects of submicron size isolated from an extraterrestrial particle and from the Gunflint cherts are compared and shown to have similarities of size, shape and interior structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650286
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The measurement of the absorption properties of dry micro-organisms and its relationship to astronomy (1985)
    Springer
    Astrophysics and space science 113 (1985), S. 413-416 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The infrared and ultraviolet absorption measurements of bacteria reported in a recent paper by Yabushita and Wada (1985) are shown to be corrupted due to the effect of stray water in the bacterial samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650976
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The effects of irregularities of internal structure in determining the ultraviolet properties of interstellar grains (1985)
    Springer
    Astrophysics and space science 114 (1985), S. 303-309 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Whereas data for the extinction of starlight in the visible show the interstellar grains must be partially hollow, data in the ultraviolet show the vesicular interiors must be irregular. In particular, the absorbing materials responsible for excess extinction over a band centred at ∼2175 Å are required to be concentrated in irregularly distributed chromophores with dimensions of the order of or less than one-tenth of the whole grain. The laboratory measurements of absorptions produced by microorganisms agree very closely with astronomical observations for a large number of early-type stars. Since the interior structures of microorganisms are indeed highly irregular, the laboratory measurements made with microorganisms suspended in a fluid, can reasonably be transferred to microorganismsin vacuo. The characteristic dimension for the scattering of visible light by rod-like grains has in the past been taken to be rod diameters. An alternate interpretation with the characteristic dimension taken instead to be rod-oengths may turn out to have advantages in respect of data in the ultraviolet, as well as agreeing in scale with bacteria-like objects found in meteorites, and possibly also, in particles entering the Earth's atmosphere from the zodiacal cloud.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653975
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    On the nature of the particles causing the 2200 Å peak in the extinction of starlight (1986)
    Springer
    Astrophysics and space science 122 (1986), S. 181-184 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The recently reported discovery of the essentially spherical molecule C60 provides a possible explanation of the 2180 Å peak in the extinction of starlight, an explanation that appears to be free of objections to the earlier graphite hypothesis
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654391
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The ultraviolet absorbance of presumably interstellar bacteria and related matters (1985)
    Springer
    Astrophysics and space science 111 (1985), S. 65-78 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the well-known 2200 Å peak in the extinction of starlight is explained by microorganisms. A mixed culture of diatoms and bacteria, which previously we found to give excellent fits to astronomical data in the infrared, has a peak absorption slightly shortward of 2200 Å, in very close agreement with the absorptions found in directions towards most early-type stars. The peak absorption is measured to be ∼35000 cm2 g−1. This is in addition to a scattering component of the extinction which has an estimated value for dry microorganisms of ∼50000 cm2 g−1. The scattering calculated for a size distribution of non-absorbing hollow bacteria with irregularities on the scale of 300 Å produces agreement with both the visual extinction law and the observed λ−1 type extinction at the far ultraviolet. The contribution to the extinction from a pure scattering bacterial model is about 3.4 mag per kpc pathlenght along the galactic plane at λ=2175 Å. Absorption near this wavelength effectively adds ∼2.3 mag per kpc, making up precisely the observed total extinction at the peak of 5.7 mag per kpc. The full range of the interstellar extinction observations is now elegantly explained on the basis of a bacterial model alone with no added components or free parameters to be fitted. Photolysis has little effect on the bulk refractive index of the particles and so does not change the scattering component appreciably. But photolysis due to sufficient UV in space can reduce the effectiveness of the 2200 Å absorption in comparison with the scattering, thereby decreasing the height of the absorption peak. An extreme example of this is the Large Magellanic Cloud, where UV emission from a profusion of early-type stars has reduced the absorbance of the particles to about one-quarter of its value for most of our galaxy. The 2200 Å absorption has generally been attributed to small graphite particles. We explain how this belief has come about and why in the past we have been swayed by it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651517
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The viability with respect to temperature, of micro-organisms incident on the Earth's atmosphere (1986)
    Springer
    Earth, moon and planets 35 (1986), S. 79-84 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Using laboratory measurements of the resistance of E. coli to flash-heating, it is shown that a large fraction of interplanetary micro-organisms in prograde orbits could be added to the Earth without losing viability due to heating by the atmospheric gases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054136
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    The nature of dust grains in the comae of Comets černis and Bowell (1985)
    Springer
    Earth, moon and planets 33 (1985), S. 179-187 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The currently available infrared data on scattered light from the dust comae of Černis and Bowell set stringent upper limits to the contribution of icy grains. For Comet Černis the data is consistent with only a 10% mass fraction of water-ice included within silicate-organic-carbon grains of scale radius 15 microns, while for Comet Bowell there is no evidence for any ice component. A coma of small (10–100Μm) organic grains containing a fraction of OH-bearing molecules that evaporate over weeks at 5 AU and leave an absorptive carbonaceous grain residue is the simplest model for Comet Bowell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00116794
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    Paper (German National Licenses)
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