Tolerance of Dried Cells of a Terrestrial Cyanobacterium, Nostoc sp. HK-01 to Temperature Cycles, Helium-ion Beams, Ultraviolet Radiation (172 and 254 nm), and Gamma Rays : Primitive Analysis for Space Experiments

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  • Tomita-Yokotani Kaori
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • Kimura Shunta
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • Ong Midori
    Graduate school of Life and Environmental Sciences, University of Tsukuba
  • Ajioka Reiko
    Graduate school of Life and Environmental Sciences, University of Tsukuba
  • Igarashi Yuichi
    Graduate school of Life and Environmental Sciences, University of Tsukuba
  • Fujishiro Haruka
    College of Agro-Biological Resource Sciences, University of Tsukuba
  • Katoh Hiroshi
    Division of Plant Functional Genomics, Advanced Science Research Promotion Center, Organization for the Promotion of Regional Innovation, Mie University
  • Hashimoto Hirofumi
    Institute of Space and Astronautical Sciences, Japan Aerospace Exploration Agency (ISAS/JAXA)
  • Mita Hajime
    Faculty of Engineering, Fukuoka University
  • Yokobori Shin-ichi
    School of Life Sciences, Tokyo University of Pharmacy and Life Sciences
  • Ohmori Masayuki
    The University of Tokyo, Komaba, Graduate School of Arts and Sciences

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タイトル別名
  • Tolerance of Dried Cells of a Terrestrial Cyanobacterium, <i>Nostoc</i> sp. HK-01 to Temperature Cycles, Helium-ion Beams, Ultraviolet Radiation (172 and 254 nm), and Gamma Rays: Primitive Analysis for Space Experiments

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抄録

<p>Cyanobacteria are photosynthetic organisms. This study aimed to examine the cellular tolerance of a terrestrial cyanobacterium, Nostoc sp. HK-01 to cosmic rays to assess its potential application in studies on extraterrestrial environments and the possibility of interplanetary transformation. This strain is a candidate organism for introduction in extraterrestrial environments such as those on Mars owing to its high tolerance to heat, dryness, and vacuum conditions. Dried cells were exposed to extreme environments and survival germinated cell rates were conformed after the tests. Dried cells of Nostoc sp. HK-01 colonies were exposed to a temperature cycle of 80°C and －80°C for 90 min, vacuum, a helium-ion beam (He), ultraviolet (VUV) rays (172 nm), UV rays (254 nm), and gamma rays (5 kGy). Live cells were confirmed in all experiments. The D10 values of a helium-ion beam, VUV, UV and a gamma rays (5 kGy) tests were 2.9 kGy, 11.5 kJ cm-2 , 1.2 kJ cm-2 and 19.9 kGy, respectively. The present results indicate that cyanobacteria can be potentially used for future manned space missions and it was confirmed that these cells could be transported to extraterrestrial environments.</p>

収録刊行物

  • Eco-Engineering

    Eco-Engineering 32 (3), 47-53, 2020-07-31

    生態工学会

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