Arid
DOI10.1007/s11084-015-9467-9
Preservation of Biomarkers from Cyanobacteria Mixed with Mars Like Regolith Under Simulated Martian Atmosphere and UV Flux
Baque, Mickael1; Verseux, Cyprien1; Boettger, Ute2; Rabbow, Elke3; de Vera, Jean-Pierre Paul2; Billi, Daniela1,4
通讯作者Billi, Daniela
会议名称14th European Astrobiology Conference (EANA)
会议日期OCT 13-16, 2014
会议地点Edinburgh, SCOTLAND
英文摘要

The space mission EXPOSE-R2 launched on the 24th of July 2014 to the International Space Station is carrying the BIOMEX (BIOlogy and Mars EXperiment) experiment aimed at investigating the endurance of extremophiles and stability of biomolecules under space and Mars-like conditions. In order to prepare the analyses of the returned samples, ground-based simulations were carried out in Planetary and Space Simulation facilities. During the ground-based simulations, Chroococcidiopsis cells mixed with two Martian mineral analogues (phyllosilicatic and sulfatic Mars regolith simulants) were exposed to a Martian simulated atmosphere combined or not with UVirradiation corresponding to the dose received during a 1-year-exposure in low Earth orbit (or half a Martian year on Mars). Cell survival and preservation of potential biomarkers such as photosynthetic and photoprotective pigments or DNA were assessed by colony forming ability assays, confocal laser scanning microscopy, Raman spectroscopy and PCR-based assays. DNA and photoprotective pigments (carotenoids) were detectable after simulations of the space mission (570 MJ/m(2) of UV 200-400 nm irradiation and Martian simulated atmosphere), even though signals were attenuated by the treatment. The fluorescence signal from photosynthetic pigments was differently preserved after UV irradiation, depending on the thickness of the samples. UV irradiation caused a high background fluorescence of the Martian mineral analogues, as revealed by Raman spectroscopy. Further investigation will be needed to ensure unambiguous identification and operations of future Mars missions. However, a 3-month exposure to a Martian simulated atmosphere showed no significant damaging effect on the tested cyanobacterial biosignatures, pointing out the relevance of the latter for future investigations after the EXPOSE-R2 mission. Data gathered during the ground-based simulations will contribute to interpret results from space experiments and guide our search for life on Mars.


英文关键词Astrobiology Cyanobacteria Biosignatures Martian regoliths EXPOSE-R2
来源出版物ORIGINS OF LIFE AND EVOLUTION OF BIOSPHERES
ISSN0169-6149
EISSN1573-0875
出版年2016
卷号46
期号2-3
页码289-310
出版者SPRINGER
类型Article;Proceedings Paper
语种英语
国家Italy;Germany
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000385183300011
WOS关键词RAMAN-SPECTROSCOPIC ANALYSIS ; LIFE MARKER CHIP ; LOW-EARTH-ORBIT ; IN-SITU ; EXOMARS MISSION ; RADIATION-RESISTANCE ; ANTARCTIC HABITATS ; IONIZING-RADIATION ; MICROBIAL LIFE ; MOJAVE DESERT
WOS类目Biology
WOS研究方向Life Sciences & Biomedicine - Other Topics
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/304796
作者单位1.Univ Roma Tor Vergata, Dept Biol, Rome, Italy;
2.German Aerosp Ctr DLR, Inst Planetary Res, Berlin, Germany;
3.German Aerosp Ctr DLR, Inst Aerosp Med, Radiat Biol Dept, Cologne, Germany;
4.Univ Roma Tor Vergata, Dipartimento Biol, Rome, Italy
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Baque, Mickael,Verseux, Cyprien,Boettger, Ute,et al. Preservation of Biomarkers from Cyanobacteria Mixed with Mars Like Regolith Under Simulated Martian Atmosphere and UV Flux[C]:SPRINGER,2016:289-310.
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