18. ヨコヅナクマムシの凍結耐性(平成20年度第54回低温生物工学会年会)

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  • 18. Freezing Tolerance of the Tardigrade Ramazzottius varieornatus(Papers presented at the 54^<th> Annual Meeting, June 14, 2008, Ishikawa)
  • ヨコヅナクマムシの凍結耐性
  • ヨコズナクマムシ ノ トウケツ タイセイ

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The effects of cooling rates on freezing and survival numbers of the tardigrade Ramazzottius varieornatus have been examined. R. varieornatus has been cooled to subzero temperatures ranging from -2 to -20℃ at different cooling rates of 0.2, 1, or 5℃/min. The number of tardigrades frozen increases as the cooling rate increases. Survival rates are maximized at an intermediate cooling rate (1℃/min), implying that there is an optimal cooling rate for R. varieornatus to survive exposure to subzero temperatures. The freezing tolerance of R. varieornatus may be derived from the ability to survive dehydration since it is thought that common physiological mechanisms are involved in both freezing tolerance and desiccation tolerance.

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