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  1. Article ; Online: A Deep Ultraviolet Raman and Fluorescence Spectral Library of 51 Organic Compounds for the SHERLOC Instrument Onboard Mars 2020.

    Razzell Hollis, Joseph / Sharma, Sunanda / Abbey, William / Bhartia, Rohit / Beegle, Luther / Fries, Marc / Hein, Jeffrey D / Monacelli, Brian / Nordman, Austin D

    Astrobiology

    2022  Volume 23, Issue 1, Page(s) 1–23

    Abstract: We report deep ultraviolet (DUV) Raman and Fluorescence spectra obtained on a SHERLOC (Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals) analog instrument for 51 pure organic compounds, including 5 carboxylic acids, ... ...

    Abstract We report deep ultraviolet (DUV) Raman and Fluorescence spectra obtained on a SHERLOC (Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals) analog instrument for 51 pure organic compounds, including 5 carboxylic acids, 10 polycyclic aromatic hydrocarbons, 24 amino acids, 6 nucleobases, and 6 different grades of macromolecular carbon from humic acid to graphite. Organic mixtures were not investigated. We discuss how the DUV fluorescence and Raman spectra exhibited by different organic compounds allow for detection, classification, and identification of organics by SHERLOC. We find that 1- and 2-ring aromatic compounds produce detectable fluorescence within SHERLOC's spectral range (250-355 nm), but fluorescence spectra are not unique enough to enable easy identification of particular compounds. However, both aromatic and aliphatic compounds can be identified by their Raman spectra, with the number of Raman peaks and their positions being highly specific to chemical structure, within SHERLOC's reported spectral uncertainty of ±5 cm
    MeSH term(s) Fluorescence ; Organic Chemicals ; Carboxylic Acids ; Carbon ; Graphite ; Mars ; Spectrum Analysis, Raman
    Chemical Substances Organic Chemicals ; Carboxylic Acids ; Carbon (7440-44-0) ; Graphite (7782-42-5)
    Language English
    Publishing date 2022-11-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2047736-3
    ISSN 1557-8070 ; 1531-1074
    ISSN (online) 1557-8070
    ISSN 1531-1074
    DOI 10.1089/ast.2022.0023
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Spectroscopy and viability of Bacillus subtilis spores after ultraviolet irradiation: implications for the detection of potential bacterial life on Europa.

    Noell, Aaron C / Ely, Tucker / Bolser, Diana K / Darrach, Halley / Hodyss, Robert / Johnson, Paul V / Hein, Jeffrey D / Ponce, Adrian

    Astrobiology

    2015  Volume 15, Issue 1, Page(s) 20–31

    Abstract: One of the most habitable environments in the Solar System outside of Earth may exist underneath the ice on Europa. In the near future, our best chance to look for chemical signatures of a habitable environment (or life itself) will likely be at the ... ...

    Abstract One of the most habitable environments in the Solar System outside of Earth may exist underneath the ice on Europa. In the near future, our best chance to look for chemical signatures of a habitable environment (or life itself) will likely be at the inhospitable icy surface. Therefore, it is important to understand the ability of organic signatures of life and life itself to persist under simulated europan surface conditions. Toward that end, this work examined the UV photolysis of Bacillus subtilis spores and their chemical marker dipicolinic acid (DPA) at temperatures and pressures relevant to Europa. In addition, inactivation curves for the spores at 100 K, 100 K covered in one micron of ice, and 298 K were measured to determine the probability for spore survival at the surface. Fourier transform infrared spectra of irradiated DPA showed a loss of carboxyl groups to CO2 as expected but unexpectedly showed significant opening of the heterocyclic ring, even for wavelengths>200 nm. Both DPA and B. subtilis spores showed identical unknown spectral bands of photoproducts after irradiation, further highlighting the importance of DPA in the photochemistry of spores. Spore survival was enhanced at 100 K by ∼5× relative to 298 K, but 99.9% of spores were still inactivated after the equivalent of ∼25 h of exposure on the europan surface.
    MeSH term(s) Artifacts ; Bacillus subtilis/physiology ; Bacillus subtilis/radiation effects ; Exobiology ; Photochemistry ; Picolinic Acids/chemistry ; Pressure ; Spectrophotometry ; Spectrophotometry, Infrared ; Spectroscopy, Fourier Transform Infrared ; Spores/physiology ; Spores/radiation effects ; Temperature ; Ultraviolet Rays ; Water/chemistry
    Chemical Substances Picolinic Acids ; Water (059QF0KO0R) ; dipicolinic acid (UE81S5CQ0G)
    Language English
    Publishing date 2015-01
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2047736-3
    ISSN 1557-8070 ; 1531-1074
    ISSN (online) 1557-8070
    ISSN 1531-1074
    DOI 10.1089/ast.2014.1169
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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