在一个古老的地下盐系统中,放射性支持氧化代谢
Devan M Nisson1, Thomas L Kieft2, Julio Castillo3
1Department of Geosciences, Princeton University, Princeton, NJ 08540, United States.
ISME communications
|December 11, 2024
概括
如果水岩反应提供可持续的能量,微生物生命可能存在于深层,孤立的盐水中. 对南非一座矿山的研究.
科学领域:
- *天体生物学和地质生物学:研究极端地下环境中的生命.
背景情况:
- * 地下深层盐环境,隔离了数百万至数十亿年,为微生物居住提供了独特的挑战和机会.
- * 对于这些低生物质,高盐和放射性活性系统中的微生物群落的了解有限.
研究的目的:
- * 描述微生物生命的分类学和代谢潜力,这些潜力来自莫阿布霍松矿的深层隔离盐水中.
- *通过分析微生物的能量获取和生存策略来评估这种极端环境的可居住性.
主要方法:
- *单细胞基因组放大和从低生物质盐水样本中测序95个基因组.
- *获得的基因组的分类学和功能性注释,以推断代谢能力.
- * 微生物群落与周围的矿井水和含水层样本进行比较.
主要成果:
- * 确定的主要微生物家族是Halomondaceae (58%),Microbacteriaceae (24%),和Idiomarinaceae (8%),与其他矿泉水样本不同.
- *代谢途径表明有氧异构,发酵,脱和硫酸盐氧化的能力.
- * 微生物拥有复杂的有机降解,生物合成和运动的途径,表明它们适应了极端条件.
结论:
- * 含有高度放射性核素的地下盐水可以支持由氧气等放射性生成基质为燃料的微生物生命.
- *这些环境在地质时间尺度上 (数千到数十亿年) 具有潜在的宜居性和氧化还原可持续性.
- *这些发现扩大了我们对极端地下生态系统中生命极限的理解.
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