STUDIES OF THE RESISTANCE OF «TERRESTRIAL» AND «SPACE» BACILLUS LICHENIFORMIS STRAINS TO THE EXTREME SPACEFLIGHT FACTORS

Q4 Biochemistry, Genetics and Molecular Biology Aviakosmicheskaia i ekologicheskaia meditsina = Aerospace and environmental medicine Pub Date : 2022-01-01 DOI:10.21687/0233-528x-2022-56-1-76-85

S. Kharin, E. Deshevaya, S. V. Fialkina, А.А. Guridov, A.B. Polianskaya, А. Dymova, P.D. Osipova, S. Poddubko

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Abstract

The paper presents the results of studying resistance of spores from «terrestrial» and «space» Bacillus licheniformis strains to antimicrobial agents, ultraviolet and radiation. It was established that the resistance of «space» strains to the influence of these extreme factors was noticeably more than for "terrestrial" strains. The most probable explanation of the stronger resistance of «space» strains can be genetic changes aimed to activate intracellular adaptive mechanisms preserved in succeeding generations. Spores from B. licheniformis 24 strain isolated from the ISS environment and exposed to the outer space as part of the EXPOSE-R2 experiment were found to have weakened resistance to antimicrobial agents in subsequent generations. Some of the «space» strains showed the ability to survive exposure to high doses of pulsed UV (1 kJ/m2) and ionizing radiation (20 kGy).

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地衣芽孢杆菌“陆地”和“太空”菌株对极端航天因素的抗性研究

本文介绍了“陆地”和“太空”地衣芽孢杆菌菌株孢子对抗菌剂、紫外线和辐射的抗性研究结果。可以确定的是，"空间"菌株对这些极端因素影响的抵抗力明显强于"陆地"菌株。最可能的解释是，“太空”菌株的抵抗力更强，其目的是激活细胞内适应机制，并在后代中保存下来。作为暴露- r2实验的一部分，从国际空间站环境中分离出的地衣芽孢杆菌24菌株的孢子暴露在外太空，发现其后代对抗菌剂的耐药性减弱。一些“太空”菌株显示出在高剂量脉冲紫外线(1千焦/平方米)和电离辐射(20千吉)下存活的能力。

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Aviakosmicheskaia i ekologicheskaia meditsina = Aerospace and environmental medicine Biochemistry, Genetics and Molecular Biology-Biochemistry, Genetics and Molecular Biology (all)

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0.60

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