@article{oai:repo.qst.go.jp:00046852,
 author = {Kawaguchi, Yuko and Yang, Yinjie and Kawashiri, Narutoshi and Shiraishi, Keisuke and Takasu, Masako and Narumi, Issay and Satoh, Katsuya and Hashimoto, Hirofumi and Nakagawa, Kazumichi and Tanigawa, Yoshiaki and Momoki, Yoh-hei and Tanabe, Maiko and Sugino, Tomohiro and Takahashi, Yuta and Shimizu, Yasuyuki and Yoshida, Satoshi and Kobayashi, Kensei and Yokobori, Shinichi and Yamagishi, Akihiko and 河口 優子 and Ｙａｎｇ Ｙｉｎｊｉｅ and 鳴海 一成 and 吉田 聡 and 小林 憲正 and 横堀 伸一},
 issue = {4/5},
 journal = {Origins of Life and Evolution of Biospheres},
 month = {Oct},
 note = {To investigate the possible interplanetary transfer of life, numerous exposure experiments have been carried out on various microbes in space since the 1960s. In the Tanpopo mission, we have proposed to carry out experiments on capture and space exposure of microbes at the Exposure Facility of the Japanese Experimental Module of the International Space Station (ISS). Microbial candidates for the exposure experiments in space include Deinococcus spp.: Deinococcus radiodurans, D. aerius and D. aetherius. In this paper, we have examined the survivability of Deinococcus spp. under the environmental conditions in ISS in orbit (i.e., long exposure to heavy-ion beams, temperature cycles, vacuum and UV irradiation). A One-year dose of heavy-ion beam irradiation did not affect the viability of Deinococcus spp. within the detection limit. Vacuum (10−1 Pa) also had little effect on the cell viability. Experiments to test the effects of changes in temperature from 80 °C to −80 °C in 90 min (±80 °C/90 min cycle) or from 60 °C to −60 °C in 90 min (±60 °C/90 min cycle) on cell viability revealed that the survival rate decreased severely by the ±80 °C/90 min temperature cycle. Exposure of various thicknesses of deinococcal cell aggregates to UV radiation (172 nm and 254 nm, respectively) revealed that a few hundred micrometer thick aggregate of deinococcal cells would be able to withstand the solar UV radiation on ISS for 1 year. We concluded that aggregated deinococcal cells will survive the yearlong exposure experiments. We propose that microbial cells can aggregate as an ark for the interplanetary transfer of microbes, and we named it ‘massapanspermia’.},
 pages = {411--428},
 title = {The possible interplanetary transfer of microbes: assessing the viability of Deinococcus spp. under the ISS environmental conditions for performing exposure experiments of microbes in the Tanpopo mission},
 volume = {43},
 year = {2013}
}