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  • Abrevaya, Ximena C.University of Buenos Aires (author)

Protective Effects of Halite to Vacuum and Vacuum-Ultraviolet Radiation : A Potential Scenario during a Young Sun Superflare

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • Mary Ann Liebert Inc,2023
  • 24 s.

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:bce27d27-2d11-485b-85a3-bf59a731aa89
  • https://lup.lub.lu.se/record/bce27d27-2d11-485b-85a3-bf59a731aa89URI
  • https://doi.org/10.1089/ast.2022.0016DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Halite (NaCl mineral) has exhibited the potential to preserve microorganisms for millions of years on Earth. This mineral was also identified on Mars and in meteorites. In this study, we investigated the potential of halite crystals to protect microbial life-forms on the surface of an airless body (e.g., meteorite), for instance, during a lithopanspermia process (interplanetary travel step) in the early Solar System. To investigate the effect of the radiation of the young Sun on microorganisms, we performed extensive simulation experiments by employing a synchrotron facility. We focused on two exposure conditions: vacuum (low Earth orbit, 10-4 Pa) and vacuum-ultraviolet (VUV) radiation (range 57.6-124 nm, flux 7.14 W/m2), with the latter representing an extreme scenario with high VUV fluxes comparable to the amount of radiation of a stellar superflare from the young Sun. The stellar VUV parameters were estimated by using the very well-studied solar analog of the young Sun, κ1 Cet. To evaluate the protective effects of halite, we entrapped a halophilic archaeon (Haloferax volcanii) and a non-halophilic bacterium (Deinococcus radiodurans) in laboratory-grown halite. Control groups were cells entrapped in salt crystals (mixtures of different salts and NaCl) and non-trapped (naked) cells, respectively. All groups were exposed either to vacuum alone or to vacuum plus VUV. Our results demonstrate that halite can serve as protection against vacuum and VUV radiation, regardless of the type of microorganism. In addition, we found that the protection is higher than provided by crystals obtained from mixtures of salts. This extends the protective effects of halite documented in previous studies and reinforces the possibility to consider the crystals of this mineral as potential preservation structures in airless bodies or as vehicles for the interplanetary transfer of microorganisms.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Galante, DouglasBrazilian Center For Research In Energy And Materials (CNPEM) (author)
  • Tribelli, Paula M.University of Buenos Aires (author)
  • Oppezzo, Oscar J.Centro Atomico Constituyentes (author)
  • Nobrega, FelipeUniversity of São Paulo (author)
  • Araujo, Gabriel G.University of São Paulo (author)
  • Rodrigues, FabioUniversity of São Paulo (author)
  • Odert, PetraKarl-Franzens-University of Graz (author)
  • Leitzinger, MartinKarl-Franzens-University of Graz (author)
  • Ricardi, Martiniano M.University of Buenos Aires (author)
  • Varela, Maria EugeniaInstituto de Ciencias Astronomicas de la Tierra y Del Espacio (ICATE) (author)
  • Gallo, TamiresLund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,LU profilområde: Ljus och material,Lunds universitets profilområden,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,LU Profile Area: Light and Materials,Lund University Profile areas(Swepub:lu)ta4832ga (author)
  • Sanz-Forcada, JorgeCSIC Centro de Astrobiologia (INTA) (author)
  • Ribas, IgnasiCSIC Institute of Space Sciences (ICE),CSIC Institut de Ciènces de l’Espai (IEEC) (author)
  • Porto De Mello, Gustavo F.Federal University of Rio de Janeiro (author)
  • Rodler, FlorianEuropean Southern Observatory Santiago (author)
  • Cerini, Maria FernandaBrazilian Center For Research In Energy And Materials (CNPEM) (author)
  • Hanslmeier, ArnoldKarl-Franzens-University of Graz (author)
  • Horvath, Jorge E.University of São Paulo (author)
  • University of Buenos AiresBrazilian Center For Research In Energy And Materials (CNPEM) (creator_code:org_t)

Related titles

  • In:Astrobiology: Mary Ann Liebert Inc23:3, s. 245-2681531-10741557-8070

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