在古代零度以下盐水中模拟细菌群落的能量
Georges Kanaan1, Tori M Hoehler2, Go Iwahana3
1School of Oceanography and Astrobiology Program, University of Washington, Seattle, WA, United States.
Frontiers in microbiology
|August 11, 2023
概括
古老的阿拉斯加冷盐水通过利用有机碳来保护密集的细菌生态系统. 这些低于零度的高盐环境支持令人惊的高微生物代谢率,对生存和生态系统功能至关重要.
科学领域:
- 地质微生物学的生物.
- 永久土科学 永久土科学
- 天体生物学 天体生物学
背景情况:
- 化盐水是古老的,孤立的超水体,在零下永久土中发现.
- 阿拉斯加的Utqiaġvik冷系统可以追溯到普莱斯托纪晚期,含有高的有机碳和细菌密度.
- 支持这些极端生态系统的能量基础仍然不太清楚.
研究的目的:
- 为了研究Utqiaġvik cryopeg盐生态系统的能量.
- 为了估计微生物的新陈代谢率在零下,高盐环境.
- 为了建模有机碳循环和微生物社区生长轨迹.
主要方法:
- 估计的初始有机碳量使用文献数据和存档的钻井样本.
- 基于细菌生长轨迹的细胞特异性代谢率的计算边界.
- 开发并将有机碳循环模型应用于钻井数据,包括酶转换率和溶解无机碳/测量.
主要成果:
- 该研究提供了第一个社区估计在零度以下的高盐环境中的代谢率.
- 模型模拟成功重建了微生物生长,预测了当前的细胞密度和有机碳含量.
- 发现与海洋沉积物相比,细胞特异性代谢率相对较高,这归因于对细胞外酶和多糖的能源投资.
结论:
- 乌特基亚格维克冷凝土生态系统的高微生物代谢率得到了有效的有机碳循环和冷凝保护策略的支持.
- 这些发现为地球上孤立的极端环境中的微生物提供了洞察力.
- 这项研究对理解外星冰盐水中的潜在生命有意义,例如在欧罗巴,恒星和火星上.
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