"Mars Farm" Microbes Leave 'Fingerprints' on Martian Rocks
At the Department of Biophysical Chemistry at the University of Vienna, Tetyana Milojevic and her team have been operating a miniaturized “Mars farm” in order to simulate ancient and probably extinct microbial life – based on gases and synthetically produced Martian regolith of diverse composition.
This is biotransformed synthetic Martian Regolith after Metallosphaera sedula cultivation.
Credit and Copyright:-Tetyana Milojevic
To satisfy microbial nutritional fitness, the research team uses mineral mixtures that mimic the Martian regolith composition from different locations and historical periods of Mars: “JSC 1A” is mainly composed of palagonite – a rock that was created by lava; “P-MRS” is rich in hydrated phyllosilicates; the sulfate containing “S-MRS”, emerging from acidic times on Mars and the highly porous “MRS07/52″ that consists of silicate and iron compounds and simulates sediments of the Martian surface.
This is Metallosphaera sedula grown on synthetic Martian Regolith. The microbes are specifically stained by Fluorescence-In-Situ-Hybridization (FISH).
These are microspheroids containing mostly aluminium and chlorine overgrow the mineral surface of synthetic Mars regolith. These microspheroids can only be observed after cultivation of Metallosphaera sedula.
Using electron microscopy tools combined with analytical spectroscopy techniques, the researchers were able to examine the surface of bioprocessed Martian regolith simulants in detail. Cooperation with the workgroup of chemist Veronika Somoza from the Department of Physiological Chemistry was valuable to achieve these results. “The obtained results expand our knowledge of biogeochemical processes of possible life beyond earth, and provide specific indications for detection of biosignatures on extraterrestrial material – a step further to prove potential extra-terrestrial life”, says Tetyana Milojevic.
Contacts and sources:
Publication in Frontiers in Microbiology, Research Topic “Habitability Beyond Earth”:
Kölbl D, Pignitter M, Somoza V, Schimak MP, Strbak O, Blazevic A and Milojevic T (2017) Exploring Fingerprints of the Extreme Thermoacidophile Metallosphaera sedula Grown on Synthetic Martian Regolith Materials as the Sole Energy Sources. Front. Microbiol. 8:1918. doi: 10.3389/fmicb.2017.01918
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