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首页> 外文期刊>Astrobiology >The structure of resting bacterial populations in soil and subsoil permafrost
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The structure of resting bacterial populations in soil and subsoil permafrost

机译：多年冻土和土壤中静止细菌种群的结构

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摘要

The structure of individual cells in microbial populations in situ of the Arctic and Antarctic permafrost was studied by scanning and transmission electron microscopy methods and compared with that of cyst-like resting forms generated under special conditions by the non-spore-forming bacteria Arthrobacter and Micrococcus isolated from the permafrost. Electron microscopy examination of microorganisms in situ revealed several types of bacterial cells having no signs of damage, including "dwarf" curved forms similar to nanoforms. Intact bacterial cells in situ and frozen cultures of the permafrost isolates differed from vegetative cells by thickened cell walls, the altered structure of cytoplasm, and the compact nucleoid, and were similar in these features to cyst-like resting forms of non-spore-forming "permafrost" bacterial strains of Arthrobacter and Micrococcus spp. Cyst-like cells, being resistant to adverse external factors, are regarded as being responsible for survival of the non-spore-formers under prolonged exposure to subzero temperatures and can be a target to search for living microorganisms in natural environments both on the Earth and on extraterrestrial bodies.
机译：通过扫描和透射电镜方法研究了北极和南极多年冻土原位微生物种群的单个细胞结构，并将其与非孢子形成细菌节杆菌和微球菌在特殊条件下产生的囊状静止形式的细胞结构进行了比较。与多年冻土隔离。电子显微镜检查原位微生物，发现几种类型的细菌细胞没有损坏迹象，包括类似于纳米形态的“矮”弯曲形态。多年冻土分离物的原位完整细菌细胞和冷冻培养物与营养细胞的区别在于细胞壁增厚，细胞质结构改变和致密的核仁，并且在这些特征上类似于非孢子形成的囊样静止形式关节杆菌和微球菌的“多年冻土”细菌菌株。抵抗不利的外部因素的类囊肿细胞被认为是非孢子形成者在长时间暴露于零下温度下生存的原因，并且可以成为在地球和自然环境中寻找活微生物的目标。在地球外的身体上。

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