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  • 1
    Electronic Resource
    Electronic Resource
    Perennial N 2 supersaturation in an Antarctic lake (1987)
    [s.l.] : Nature Publishing Group
    Nature 325 (1987), S. 343-345 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Lake Hoare (77°38f S, 162°53' E) is at the eastern end of Taylor Valley in southern Victoria Land, Antarctica. It is 58 m above sea level, 4.1 km long, 1.0 km wide, with a surface area of 1.8 km2, a maximum depth of 34 m, and a mean depth of 14.2 m. The perennial ice cover of Lake Hoare ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/325343a0
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  • 2
    Electronic Resource
    Electronic Resource
    Modern freshwater microbialite analogues for ancient dendritic reef structures (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 407 (2000), S. 626-629 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Microbialites are organosedimentary structures that can be constructed by a variety of metabolically distinct taxa. Consequently, microbialite structures abound in the fossil record, although the exact nature of the biogeochemical processes that produced them is often unknown. One such ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35036579
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  • 3
    Electronic Resource
    Electronic Resource
    Antarctic climate cooling and terrestrial ecosystem response (2002)
    [s.l.] : Nature Publishing Group
    Nature 415 (2002), S. 517-520 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The average air temperature at the Earth's surface has increased by 0.06 °C per decade during the 20th century, and by 0.19 °C per decade from 1979 to 1998. Climate models generally predict amplified warming in polar regions, as observed in Antarctica's peninsula ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature710
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  • 4
    Electronic Resource
    Electronic Resource
    To directly go (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 780-780 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Case for Mars: The Plan to Settle the Red Planet and Why We Must. By Robert Zubrin with Richard Wagner. Free Press: 1996. Pp. 318. $25, £16.99. "THE Case for Mars" is the title of a series of conferences held at the University of Colorado every three years since 1980. The goal of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/383780a0
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  • 5
    Electronic Resource
    Electronic Resource
    Planetary planting (1995)
    [s.l.] : Nature Publishing Group
    Nature 375 (1995), S. 26-27 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] TERRAFORMING - a wonderfully self-defining word that means altering another planet to make it Earth-like - is not what it used to be. Once the sole province of science fiction, terraforming - at least as applied to Mars - is now seriously discussed by space scientists. In ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/375026a0
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  • 6
    Electronic Resource
    Electronic Resource
    A possible nitrogen crisis for Archaean life due to reduced nitrogen fixation by lightning (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 412 (2001), S. 61-64 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nitrogen is an essential element for life and is often the limiting nutrient for terrestrial ecosystems. As most nitrogen is locked in the kinetically stable form, N2, in the Earth's atmosphere, processes that can fix N2 into biologically available forms—such as ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35083537
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  • 7
    Electronic Resource
    Electronic Resource
    The cryptoendolithic microbial environment in the Ross Desert of Antarctica: Satellite-transmitted continuous nanoclimate data, 1984 to 1986 (1987)
    Springer
    Polar biology 7 (1987), S. 273-287 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A satellite mediated station for monitoring nanoclimate (climate in the millimeter range) data, suitable for use in polar regions is described. The station, located in the Ross desert of Antarctica, has been in operation for more than 3 years, measuring rock temperatures, air temperature, light, snow, wind, and moisture. The data indicate that biological activity in the cryptoendolithic microbial ecosystem is limited to the period from mid November to mid February. The total number of hours of biological activity, based on assumptions of the minimum light, temperature and moisture requirements of the community, is less than 1000 h/year. The time above 0°C, representing more nearly optimal conditions, is between 50 and 550 h/year, depending on the orientation of the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00443945
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  • 8
    Electronic Resource
    Electronic Resource
    Paleolakes on Mars (1995)
    Springer
    Journal of paleolimnology 13 (1995), S. 267-283 
    Details
    ISSN: 1573-0417
    Keywords: Mars ; martian paleolakes ; lacustrine sediments ; ice-covered lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Observational evidence such as outflow channels and valley networks suggest that in the past there was flowing water on Mars. The images of fluvial features on Mars logically suggest that there must exist downstream locations in which the water pooled and the sediment load deposited (i.e. lakes). Sediments and morphological features associated with the martian paleolakes are believed to occur in Valles Marineris, and several large basins including Amazonis, Chryse and Elysium planitia. As Mars became progressively colder over geological time, any lakes on its surface would have become seasonally, and eventually perennially ice-covered. We know from polar lakes on Earth that ice-covered lakes can persist even when the mean annual temperature falls below freezing. Thus, the most recent lacustrine sediments on Mars were probably deposited in ice-covered lakes. While life outside of the Earth's atmosphere has yet to be observed, there is a general consensus among exobiologists that the search for extraterrestrial life should be based upon liquid water. The inference that there was liquid water on Mars during an earlier epoch is the primary motivation for considering the possibility of life during this time. It would be of enormous interest from both an exobiological and paleolimnological perspective to discover lakes or the evidence of former lakes on another planet such as Mars. Limnology would then become an interplanetary science.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682769
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  • 9
    Electronic Resource
    Electronic Resource
    Origins of life: A comparison of theories and application to Mars (1996)
    Springer
    Origins of life and evolution of the biospheres 26 (1996), S. 61-73 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The field of study that deals with the origins of life does not have a consensus for a theory of life's origin. An analysis of the range of theories offered shows that they share some common features that may be reliable predictors when considering the possible origins of life on another planet. The fundamental datum dealing with the origins of life is that life appeared early in the history of the Earth, probably before 3.5 Ga and possibly before 3.8 Ga. What might be called the standard theory (the Oparin-Haldane theory) posits the production of organic molecules on the early Earth followed by chemical reactions that produced increased organic complexity leading eventually to organic life capable of reproduction, mutation, and selection using organic material as nutrients. A distinct class of other theories (panspermia theories) suggests that life was carried to Earth from elsewhere — these theories receive some support from recent work on planetary impact processes. Other alternatives to the standard model suggest that life arose as an inorganic (clay) form and/or that the initial energy source was not organic material but chemical energy or sunlight. We find that the entire range of current theories suggests that liquid water is the quintessential environmental criterion for both the origin and sustenance of life. It is therefore of interest that during the time that life appeared on Earth we have evidence for liquid water present on the surface of Mars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01808160
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  • 10
    Electronic Resource
    Electronic Resource
    Life on Mars (1996)
    Springer
    Origins of life and evolution of the biospheres 26 (1996), S. 300-300 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459770
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