Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Gaboyer, F; Le Milbeau, C; Bohmeier, M; Schwendner, P; Vannier, P; Beblo-Vranesevic, K; Rabbow, E; Foucher, F; Gautret, P; Guégan, R; Richard, A; Sauldubois, A; Richmann, P; Perras, AK; Moissl-Eichinger, C; Cockell, CS; Rettberg, P; Marteinsson, P; Monaghan, E; Ehrenfreund, P; Garcia-Descalzo, L; Gomez, F; Malki, M; Amils, R; Cabezas, P; Walter, N; Westall, F.
Mineralization and Preservation of an extremotolerant Bacterium Isolated from an Early Mars Analog Environment.
Sci Rep. 2017; 7(1):8775-8775
Doi: 10.1038/s41598-017-08929-4
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- Co-Autor*innen der Med Uni Graz
- Moissl-Eichinger Christine
- Perras Alexandra
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- Abstract:
- The artificial mineralization of a polyresistant bacterial strain isolated from an acidic, oligotrophic lake was carried out to better understand microbial (i) early mineralization and (ii) potential for further fossilisation. Mineralization was conducted in mineral matrixes commonly found on Mars and Early-Earth, silica and gypsum, for 6 months. Samples were analyzed using microbiological (survival rates), morphological (electron microscopy), biochemical (GC-MS, Microarray immunoassay, Rock-Eval) and spectroscopic (EDX, FTIR, RAMAN spectroscopy) methods. We also investigated the impact of physiological status on mineralization and long-term fossilisation by exposing cells or not to Mars-related stresses (desiccation and radiation). Bacterial populations remained viable after 6 months although the kinetics of mineralization and cell-mineral interactions depended on the nature of minerals. Detection of biosignatures strongly depended on analytical methods, successful with FTIR and EDX but not with RAMAN and immunoassays. Neither influence of stress exposure, nor qualitative and quantitative changes of detected molecules were observed as a function of mineralization time and matrix. Rock-Eval analysis suggests that potential for preservation on geological times may be possible only with moderate diagenetic and metamorphic conditions. The implications of our results for microfossil preservation in the geological record of Earth as well as on Mars are discussed.