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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Bacteria in the Tatahouine meteorite: nanometric-scale life in rocks
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Bacteria in the Tatahouine meteorite: nanometric-scale life in rocks

机译：Tatahouine陨石中的细菌：岩石中的纳米尺度生命

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摘要

We present a study of the textural signature of terrestrial weathering and related biological activity in the Tatahouine meteorite. Scanning and transmission electron microscopy images obtained on the weathered samples of the Tatahouine meteorite and surrounding soil show two types of bacteria-like forms lying on mineral surfaces: (1) rod-shaped forms (RSF) about 70-80 nm wide and ranging from 100 nm to 600 nm in length; (2) ovoid forms (OVF) with diameters between 70 and 300 nm. They look like single cells surrounded by a cell wall. Only Na, K, C, O and N with traces of P and S are observed in the bulk of these objects. The chemical analyses and electron diffraction patterns confirm that the RSF and OVF cannot be magnetite or other iron oxides, iron hydroxides, silicates or carbonates. The sizes of the RSF and OVF are below those commonly observed for bacteria but are very similar to some bacteria-like forms described in the Martian meteorite ALH84001. All the previous observations strongly suggest that they are bacteria of their remnants. This conclusion is further supported by microbiological experiments in which pleomorphic bacteria with morphology similar to the OVF and RSF objects are obtained from biological culture of the soil surrounding the meteorite pieces. The present results show that bacteriomorphs of diameter less than 100 nm may in fact represent real bacteria or their remnants.
机译：我们目前对塔塔胡因陨石的地面风化和相关生物活性的纹理特征进行研究。在Tatahouine陨石和周围土壤的风化样品上获得的扫描和透射电子显微镜图像显示出两种类型的细菌状形式存在于矿物表面：（1）棒状形式（RSF）约70-80 nm，范围从长度为100 nm至600 nm; （2）卵形（OVF），直径在70到300 nm之间。它们看起来像被细胞壁包围的单个细胞。在这些物体的大部分中，仅观察到具有痕量P和S的Na，K，C，O和N。化学分析和电子衍射图谱证实，RSF和OVF不能为磁铁矿或其他氧化铁，氢氧化铁，硅酸盐或碳酸盐。 RSF和OVF的大小低于细菌常见的大小，但与火星陨石ALH84001中描述的某些细菌样形式非常相似。以前的所有观察结果都强烈表明它们是残留细菌。微生物实验进一步支持了这一结论，在微生物实验中，从陨石块周围土壤的生物培养中获得了形态类似于OVF和RSF对象的多形细菌。目前的结果表明，直径小于100 nm的菌体实际上可以代表真正的细菌或其残留物。

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