Record details

Title
    The Miniaturized Raman System and Detection of Traces of Life in Halite from the Atacama Desert: Some Considerations for the Search for Life Signatures on Mars
Author
    Ascaso, Carmen
    Edwards, Howell G. M.
    Hutchinson, Ian
    Jehlička, Jan
    Vítek, Petr
    Wierzchos, Jacek
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Astrobiology
Vol./nr.
    Roč. 12, č. 12
Pages
    5
Year
    2012
Thesaurus term
    antarctic habitats
    biomarkers
    cyanobacteria
    microbial communities
    missions
    spectrometer
    spectroscopic detection
Keyword
    Atacama
    Considerations
    Desert
    Detection
    Halite
    Life
    Mars
    Miniaturized
    Raman
    Search
    Signatures
    System
    Traces
Abstract (in english)
   Raman spectroscopy is being adopted as a nondestructive instrumentation for the robotic exploration of Mars to search for traces of life in the geological record. Here, miniaturized Raman spectrometers of two different types equipped with 532 and 785 nm lasers for excitation, respectively, were compared for the detection of microbial biomarkers in natural halite from the hyperarid region of the Atacama Desert. Measurements were performed directly on the rock as well as on the homogenized, powdered samples prepared from this material-the effects of this sample preparation and the excitation wavelength employed in the analysis are compared and discussed. From these results, 532 nm excitation was found to be superior for the analysis of powdered specimens due to its high sensitivity toward carotenoids and hence a higher capability for their detection at relatively low concentration in bulk powdered specimens. For the same reason, this wavelength was a better choice for the detection of ca
   rotenoids in direct measurements made on the rock samples. The 785 nm excitation wavelength, in contrast, proved to be more sensitive toward the detection of scytonemin.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    27. 4. 2014