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Hydrogenotrophic methanogenesis at 7-12 mbar by Methanosarcina barkeri under simulated martian atmospheric conditions.
Sci Rep
January 2025
Department of Plant Pathology, Space Life Sciences Lab, University of Florida, 505 Odyssey Way, Exploration Park,, Merritt Island, FL, 32953, USA.
Mars, with its ancient history of long-lived habitable environments, continues to captivate researchers exploring the potential for extant life. This study investigates the biosignature potential of Martian methane by assessing the viability of hydrogenotrophic methanogenesis in Methanosarcina barkeri MS under simulated Martian surface conditions. We expose M.
View Article and Find Full Text PDFFrom Meteorite to Life's Building Blocks: A possible Electrochemical Pathway to Amino Acids and Peptide Bonds.
Chemistry
October 2024
Institute of Organic Chemistry, Laboratory for Sustainable Chemistry and Catalysis (LSusCat), Johannes Kepler University (JKU) Linz, Altenberger Straße, Linz, 694040, Austria.
This study explores the electrochemical properties of the carbonaceous Allende CV3 meteorite, focusing on its potential as a Fe-based catalyst derived from Mackinawite iron sulfide for electrocatalytic reactions facilitating nitrogen (N) fixation into ammonia. Through comprehensive analysis, we not only monitored the evolution of key compounds such as CN, sulfur/HS, H and carbonyl compounds, but also identified potential reagent carriers, indicating significant implications for the Strecker synthesis of amino acids in space environments. Initial examination revealed the presence of polypeptides, notably sequences including dimer Ala-α-HO-Gly, pentamer Gly-Ala, and hexamer Gly-(HO-Gly).
View Article and Find Full Text PDFMicrobial Ecology of an Arctic Travertine Geothermal Spring: Implications for Biosignature Preservation and Astrobiology.
Astrobiology
July 2024
Department of Earth and Environmental Sciences, Rutgers University, Newark, New Jersey, USA.
Jotun springs in Svalbard, Norway, is a rare warm environment in the Arctic that actively forms travertine. In this study, we assessed the microbial ecology of Jotun's active (aquatic) spring and dry spring transects. We evaluated the microbial preservation potential and mode, as well as the astrobiological relevance of the travertines to marginal carbonates mapped at Jezero Crater on Mars (the Mars 2020 landing site).
View Article and Find Full Text PDFCorrection: Wilanowska et al. Long-Term Survivability of Tardigrade (Eutardigrada) at Increased Magnesium Perchlorate Levels: Implications for Astrobiological Research. 2024, , 335.
Life (Basel)
April 2024
Department of Animal Taxonomy and Ecology, Faculty of Biology, Adam Mickiewicz University in Poznań, 61-614 Poznań, Poland.
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View Article and Find Full Text PDFAbiotic formation of alkylsulfonic acids in interstellar analog ices and implications for their detection on Ryugu.
Nat Commun
May 2024
Department of Chemistry, University of Hawaii at Mānoa, Honolulu, HI, USA.
Article Synopsis
- The mystery of sulfur's origin in Earth's first organisms has puzzled scientists for over a century, particularly due to the scarcity of sulfates during the Archean period.
- Laboratory simulations show that simple alkylsulfonic acids, which are water-soluble S(+IV) compounds, can form in space when sulfur-doped ices interact with cosmic rays.
- This finding provides insights into how essential sulfur-containing organic molecules may have been produced in extraterrestrial environments and later delivered to Earth via comets and asteroids, possibly found in meteorites like Murchison and Ryugu.
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