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  • 1
    Electronic Resource
    Electronic Resource
    Primitive atmosphere and implications for the formation of channels on Mars (1978)
    [s.l.] : Nature Publishing Group
    Nature 273 (1978), S. 730-732 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We adopt a simple model of the early martian atmosphere similar to Sagan's6 and Pollack's7, except for ammonia. The total pressure equals 100 mbar, with CH4, H2 and N2 as major components in proportions 60:6:1 by volume. The thermal structure of this atmosphere is similar to that given by Yung et ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/273730a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Amorphous Whiskers of a Cobalt–Gold Alloy (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 176-177 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] X-ray powder diffraction analysis showed that the foil contained gold and cobalt with evidence of more solid solution of cobalt in gold than would be predicted by the phase diagram as found by W. Klement, jun., in his investigations using the gun technique for rapid cooling5. In addition, however, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212176a0
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    Paper (German National Licenses)
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  • 3
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    Distinct mechanisms eliminate mother and daughter centrioles in meiosis of starfish oocytes (2016)
    Rockefeller University Press
    Details
    Publication Date: 2016-03-29
    Description: Centriole elimination is an essential process that occurs in female meiosis of metazoa to reset centriole number in the zygote at fertilization. How centrioles are eliminated remains poorly understood. Here we visualize the entire elimination process live in starfish oocytes. Using specific fluorescent markers, we demonstrate that the two older, mother centrioles are selectively removed from the oocyte by extrusion into polar bodies. We show that this requires specific positioning of the second meiotic spindle, achieved by dynein-driven transport, and anchorage of the mother centriole to the plasma membrane via mother-specific appendages. In contrast, the single daughter centriole remaining in the egg is eliminated before the first embryonic cleavage. We demonstrate that these distinct elimination mechanisms are necessary because if mother centrioles are artificially retained, they cannot be inactivated, resulting in multipolar zygotic spindles. Thus, our findings reveal a dual mechanism to eliminate centrioles: mothers are physically removed, whereas daughters are eliminated in the cytoplasm, preparing the egg for fertilization.
    Electronic ISSN: 1540-8140
    Topics: Biology
    Published by Rockefeller University Press
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