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Preservation of Raman biosignatures in cyanobacteria and green algae after space exposure

Baque, Mickael und Böttger, Ute und Leya, Thomas und de Vera, Jean Pierre Paul (2017) Preservation of Raman biosignatures in cyanobacteria and green algae after space exposure. The Early History of Planetary systems and habitable planets, 2017-08-08 - 2017-08-10, Tartu, Estonia.

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Offizielle URL: https://sisu.ut.ee/sites/default/files/eac/files/handbook_tartu.pdf

Kurzfassung

The BIOMEX (BIOlogy and Mars EXperiment) experiment aims at investigating the endurance of extremophiles and stability of biomolecules under space and Mars-like conditions in the presence of Martian mineral analogues (de Vera et al. 2012). To this end, extensive ground-based simulation studies and a space experiment were performed. Indeed, BIOMEX was part of the EXPOSE-R2 mission of the European Space Agency which allowed a 15-month exposure, on the outside of the International Space Station, of four astrobiology experiments between July 2014 and February 2016. The preservation and evolution of Raman biosignatures under real space conditions is of particular interest for guiding future search-for-life missions to Mars (and other planetary objects) carrying Raman spectrometers (such as the Raman Laser Spectrometer instrument on board the future ExoMars rover). Among the potential biosignatures investigated, the photoprotective carotenoid pigments (present either in photosynthetic organisms such as plants, algae, cyanobacteria and in some bacteria and archaea) have been classified as high priority targets for biomolecule detection on Mars and therefore used as biosignature models due to their stability and easy identification by Raman spectroscopy (Böttger et al. 2012). We report here on the first results from the analysis of two carotenoids containing organisms: the cyanobacterium Nostoc sp. (strain CCCryo 231-06; = UTEX EE21 and CCMEE 391) isolated from Antarctica and the green alga cf. Sphaerocystis sp. (strain CCCryo 101-99) isolated from Spitsbergen. Desiccated cells of these organisms were exposed to space and simulated Mars-like conditions in space in the presence of two Martian mineral analogues (phyllosilicatic and sulfatic Mars regolith simulants) and a Lunar regolith analogue and analyzed with a 532nm Raman microscope at 1mW laser power. Carotenoids in both organisms were surprisingly still detectable at relatively high levels after being exposed for 15 months in Low Earth Orbit to UV, cosmic rays, vacuum (or Mars-like atmosphere) and temperatures stresses regardless of the mineral matrix used. Further analyses will help us to correlate these results with survival potential, cellular damages or stability and the different extremophiles tested in the BIOMEX experiment.

elib-URL des Eintrags:https://elib.dlr.de/116112/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Preservation of Raman biosignatures in cyanobacteria and green algae after space exposure
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Baque, MickaelMickael.Baque (at) dlr.dehttps://orcid.org/0000-0002-6696-6030NICHT SPEZIFIZIERT
Böttger, UteUte.Boettger (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Leya, Thomasfraunhofer izi-bb, potsdam, germanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
de Vera, Jean Pierre Pauljean-pierre.devera (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:8 August 2017
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Biosignatures; space experiments; BIOMEX; Raman spectroscopy; carotenoids; cyanobacteria; green algae
Veranstaltungstitel:The Early History of Planetary systems and habitable planets
Veranstaltungsort:Tartu, Estonia
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:8 August 2017
Veranstaltungsende:10 August 2017
Veranstalter :EAC, AbGradE, Tartu University
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Planetary Evolution and Life (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Leitungsbereich PF
Institut für Optische Sensorsysteme > Terahertz- und Laserspektroskopie
Hinterlegt von: Baqué, Dr. Mickael
Hinterlegt am:28 Nov 2017 10:06
Letzte Änderung:24 Apr 2024 20:20

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