电离辐射对水合真菌细胞的影响：对行星保护和火星宜居性的影响

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2024-10-02 DOI:10.1016/j.icarus.2024.116339

A. Cassaro , C. Pacelli , A. Cemmi , I. Di Sarcina , L. Zucconi , B. Cavalazzi , P. Leo , I. Catanzaro , S. Onofri

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引用次数: 0

摘要

液态水是我们所知的生命的基本条件之一。据报道，目前在地球之外也存在液态水。地质和矿物学证据表明，水曾经在火星上流动过。最近在火星表面发现的冰水是生命探测任务的驱动因素之一。火星表面的高辐射性，加上薄薄的水层，阻碍了火星上类似陆地生命的假想形式的存在。在这种情况下，我们研究了在南极洲麦克默多干谷极端环境中生长的南极黑真菌水合菌落的存活情况。结果表明，在最低剂量下，水能明显减少存活者的数量，而在较高剂量（117 kGy）下，辐射造成的累积损害已无法通过脱水来抵消。

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The effect of ionizing radiation on hydrated fungal cells: Implications for planetary protection and mars habitability

Liquid water is one of the essential conditions for life as we know it. Its presence has been currently reported beyond Earth. Geological and mineralogical evidence indicates that water once flowed on Mars. The recent discovery of present ice-water on the planet's surface is one of the driving factors for life-detection missions. The highly radiative Martian surface, combined with aqueous thin layers, is prohibitive for the presence of hypothetical forms of terrestrial-like life on the planet. In this context, we examined the survival of hydrated colonies of the Antarctic black fungus Cryomyces antarcticus, which thrives in the extreme environment of McMurdo Dry Valleys in Antarctica, after the exposure to increasing doses of space relevant γ-rays. Results suggest that water significantly reduces the number of survivors at the lowest doses, while at the higher dose (117 kGy) the cumulative damage caused by radiation could no longer be counteracted by dehydration.

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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.