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Journal Articles

Tolerance of anhydrobiotic eggs of the tardigrade ${it Ramazzottius varieornatus}$ to extreme environments

Horikawa, Daiki*; Yamaguchi, Ayami*; Sakashita, Tetsuya; Tanaka, Daisuke*; Hamada, Nobuyuki*; Yukuhiro, Fumiko*; Kuwahara, Hirokazu*; Kunieda, Takekazu*; Watanabe, Masahiko*; Nakahara, Yuichi*; et al.

Astrobiology, 12(4), p.283 - 289, 2012/04

https://doi.org/10.1089/ast.2011.0669
 Times Cited Count：23 Percentile：68.76(Astronomy & Astrophysics)

We examined the hatchability of hydrated and anhydrobiotic eggs of the tardigrade ${it Ramazzottius varieornatus}$ to hatch after ionizing irradiation (helium ions), extremely low and high temperatures, and high vacuum. Anhydrobiotic eggs (50% lethal dose; 1690 Gy) were substantially more radioresistant than hydrated ones (50% lethal dose; 509 Gy). Anhydrobiotic eggs also have a broader temperature resistance compared with hydrated ones. Over 70% of the anhydrobiotic eggs treated at high and low temperatures, but all of the hydrated eggs failed to hatch. After exposure to high vacuum conditions, the hatchability of the anhydrobiotic eggs was comparable to that of untreated control eggs.

Oral presentation

Extremotolerance of an albino mutant strain isolated from the brown anhydrobiotic tardigrade ${it Ramazzottius}$ cf. ${it varieornatus}$

Kuwahara, Hirokazu*; Abe, Wataru*; Narumi, Issei; Kunieda, Takekazu*

no journal, , 

no abstracts in English

Oral presentation

Extremotolerance of an albino mutant strain isolated from the brown anhydrobiotic tardigrade, ${it Ramazzottius}$ cf. ${it varieornatus}$

Kuwahara, Hirokazu*; Abe, Wataru*; Narumi, Issei; Kunieda, Takekazu*

no journal, , 

no abstracts in English

Oral presentation

Analysis of an albino mutant in the extremophilic animal ${it Ramazzottius varieornatus}$

Kuwahara, Hirokazu*; Toyoda, Atsushi*; Abe, Wataru*; Narumi, Issei; Kunieda, Takekazu*

no journal, , 

no abstracts in English

Oral presentation

In-situ measurement of hydraulic conductivity affected by the cement powder and carbonated water

Kuwabara, Shogo*; Nara, Yoshitaka*; Kashiwaya, Koki*; Fujii, Hirokazu*; Zhao, Y.*; Matsui, Hiroya; Ozaki, Yusuke; Hiroyoshi, Naoki*

no journal, , 

This study aims to develop a healing method of fractured rock by injection of cement powder and carbonated water to form carbonated minerals. The in-situ hydraulic tests were carried out to confirm the effect of their injection into rock. The decrease of hydraulic conductivity was recognized after the injection of both cement powder and carbonated water, whereas the injection of only carbonated water did not induce the decrease of hydraulic conductivity.

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