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Journal Articles

Food-NaCl associative learning in response of ${it C. elegans}$ to $$gamma$$-ray irradiation

Sakashita, Tetsuya; Suzuki, Michiyo; Fukamoto, Kana; Funayama, Tomoo; Wada, Seiichi*; Kobayashi, Yasuhiko; Horikawa, Daiki*; Bolige, A.*

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 110, 2008/03

We investigated the effects of $$gamma$$ rays on the salt chemotaxis learning in ${it C. elegans}$. We observed no decrease of performance of the salt chemotaxis learning following 500 Gy $$gamma$$ irradiation. Also, ${it C. elegans}$ showed the normal chemotaxis to benzaldehyde, whereas the salt chemotaxis learning were affected by irradiation during learning.

Journal Articles

Differences in circadian rhythms of resistance to $$gamma$$-rays and heavy-ion beam in ${it Euglena}$

Bolige, A.*; Sakashita, Tetsuya; Kakizaki, Takehiko*; Funayama, Tomoo; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko; Goto, Ken*

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 117, 2008/03

We report here how these rhythms are related to each other. First, irradiation temperatures influenced neither survival after exposure to UV, $$gamma$$ rays, nor C ions, whereas the incubation at high temperatures (25 $$^{circ}$$C) after irradiation considerably lowered the survival particularly after $$gamma$$ irradiation, but not after UV irradiation at all. Secondly, although the antioxidants $$beta$$ carotene and dimethylsulfoxide (DMSO) increased the survival of the alga at the least resistant phase after UV C and UV B irradiation, respectively, to the level of the most resistant alga, none of these were not so effective for $$gamma$$ or C ion irradiation. Finally, FITC dextran was incorporated into the alga only after C ion irradiation but not $$gamma$$ irradiation, suggesting that C ion may perforate cell membranes to kill the alga.

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