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    Impact shocked rocks as protective habitats on an anoxic early Earth

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    Publication date
    2015
    Author
    Bryce, C.C.
    Horneck, G.
    Rabbow, E.
    Edwards, Howell G.M.
    Cockell, C.S.
    Keyword
    Chroococcidiopsis
    ; Early life
    ; Expose-r
    ; Impacts
    iss
    low earth orbit
    ; UV
    ; UV-radiation climate
    ; Cyanobacterium
    ; Space
    ; Life
    ; Evolution
    ; History
    ; PCR
    Show allShow less
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    On Earth, microorganisms living under intense ultraviolet (UV) radiation stress can adopt endolithic lifestyles, growing within cracks and pore spaces in rocks. Intense UV irradiation encountered by microbes leads to death and significant damage to biomolecules, which also severely diminishes the likelihood of detecting signatures of life. Here we show that porous rocks shocked by asteroid or comet impacts provide protection for phototrophs and their biomolecules during 22 months of UV radiation exposure outside the International Space Station. The UV spectrum used approximated the high-UV flux on the surface of planets lacking ozone shields such as the early Earth. These data provide a demonstration that endolithic habitats can provide a refugium from the worst-case UV radiation environments on young planets and an empirical refutation of the idea that early intense UV radiation fluxes would have prevented phototrophs without the ability to form microbial mats or produce UV protective pigments from colonizing the surface of early landmasses.
    URI
    http://hdl.handle.net/10454/9319
    Version
    No full-text available in the repository
    Citation
    Bryce CC, Horneck G, Rabbow E et al (2015) Impact shocked rocks as protective habitats on an anoxic early Earth. International Journal of Astrobiology. 14(1): 115-122.
    Link to publisher’s version
    http://dx.doi.org/10.1017/S1473550414000123
    Type
    Article
    Collections
    Life Sciences Publications

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