Vitreous Magnesium Sulfate Hydrate as a Potential Mechanism for Preservation of Microbial Viability on Europa ...
Europa’s subsurface ocean is postulated to contain appreciable amounts of Mg2+ and SO42- ions, among other species. Recent laboratory experiments have shown that when solutions containing these species freeze to Europa relevant temperatures, they can form vitreous MgSO4 hydrate, which can remain sta...
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2023
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| Online Access: | https://dx.doi.org/10.48577/jpl.stcbsq https://dataverse.jpl.nasa.gov/citation?persistentId=doi:10.48577/jpl.STCBSQ |
| Summary: | Europa’s subsurface ocean is postulated to contain appreciable amounts of Mg2+ and SO42- ions, among other species. Recent laboratory experiments have shown that when solutions containing these species freeze to Europa relevant temperatures, they can form vitreous MgSO4 hydrate, which can remain stable at these temperatures. Since vitreous phases have the potential to protect cells from physical damage that can occur during crystallization, their presence on Europa could potentially preserve entrained microorganisms from the ocean below. However, to date, it remains unclear whether such materials actually impact microbial survival. In this work, experiments were performed in which the motile non-spore forming Antarctic isolate Pseudoalteromonas haloplanktis in solutions of 0.1M MgSO4 were frozen to Europa surface temperatures (100 K) under conditions that resulted in formation of either vitreous or crystalline salt hydrates. We found that cells survived in both cases, exhibiting a 3-log reduction in viable ... |
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