Astrobiology studies the origin and evolution of life on Earth and in the universe. According to the panspermia theory, life on Earth could have emerged from bacterial species transported by meteorites, that were able to adapt and proliferate on our planet. Therefore, the study of extremophiles, i.e. bacterial species able to live in extreme terrestrial environments, can be relevant to Astrobiology studies. In this work we described the ability of the thermophilic species Geobacillus thermantarcticus to survive after exposition to simulated spatial conditions including temperature's variation, desiccation, X-rays and UVC irradiation. The response to the exposition to the space conditions was assessed at a molecular level by studying the changes in the morphology, the lipid and protein patterns, the nucleic acids. G. thermantarcticus survived to the exposition to all the stressing conditions examined, since it was able to restart cellular growth in comparable levels to control experiments carried out in the optimal growth conditions. Survival was elicited by changing proteins and lipids distribution, and by protecting the DNA's integrity.

中文翻译：

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在模拟的空间条件下嗜热嗜热热芽孢杆菌的生存和适应。

天体生物学研究地球和宇宙中生命的起源和演变。根据泛色症理论，地球上的生命可能来自陨石运输的细菌物种，这些细菌能够适应并在我们的星球上扩散。因此，极端微生物（即能够生活在极端陆地环境中的细菌物种）的研究可能与天体生物学研究有关。在这项工作中，我们描述了嗜热物种金葡菌在暴露于模拟的空间条件（包括温度变化，干燥，X射线和UVC辐射）后存活的能力。通过研究形态，脂质和蛋白质模式，核酸的变化，在分子水平上评估了对空间条件的反应。G。由于其能够以与在最佳生长条件下进行的对照实验相当的水平重新开始细胞生长，因此其在所有检查的胁迫条件下都可以存活到暴露的状态。生存是通过改变蛋白质和脂质的分布以及保护DNA的完整性来实现的。