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-rays in 
Toyoshima, Yoshiyuki*; Takahashi, Akemi*; Tanaka, Hisaki*; Watanabe, Jun*; Mogi, Yoshinobu*; Yamazaki, Tatsuo*; Hamada, Ryoko*; Iwashita, Kazuhiro*; Sato, Katsuya; Narumi, Issei
Mutation Research; Fundamental and Molecular Mechanisms of Mutagenesis, 740(1-2), p.43 - 49, 2012/12
Times Cited Count：18 Percentile：48.99(Biotechnology & Applied Microbiology)Narumiya, Yoshiyuki*; Ohashi, Hirotada*; Miyata, Koichi*; Watanabe, Norio
Dai-13-Kai Nihon Jishin Kogaku Shimpojiumu Rombunshu (DVD-ROM), p.1159 - 1166, 2010/11
no abstracts in English
Ohashi, Hirotada*; Narumiya, Yoshiyuki*; Miyata, Koichi*; Watanabe, Norio
Nihon Genshiryoku Gakkai-Shi ATOMO
, 52(11), p.732 - 736, 2010/11
no abstracts in English
Ohashi, Hirotada*; Narumiya, Yoshiyuki*; Miyata, Koichi*; Watanabe, Norio
Anzen Kogaku Shimpojiumu 2010 Koen Yokoshu, p.110 - 113, 2010/07
no abstracts in English
Toyoshima, Yoshiyuki*; Tanaka, Hisaki*; Watanabe, Jun*; Yamazaki, Tatsuo*; Iwashita, Kazuhiro*; Mikami, Shigeaki*; Sato, Katsuya; Narumi, Issei
JAEA-Review 2009-041, JAEA Takasaki Annual Report 2008, P. 82, 2009/12
no abstracts in English
Okamura, Masachika*; Shimizu, Akira*; Watanabe, Satomi*; Hase, Yoshihiro; Narumi, Issei; Tanaka, Atsushi
JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 82, 2008/03
no abstracts in English
Watanabe, Hiroshi*; Narumi, Issei; Kikuchi, Masahiro; Kobayashi, Yasuhiko
Hoshasen, 31(3), p.191 - 202, 2005/07
Radiosensitivity of organisms vary extensively with species. It has been known that there exist nonsporing but extremely radioresistant bacteria that inhabit in many natural places such as soil and environmental waste. 
, a representative of the radioresistant eubacteria, exhibits extraordinary resistance to the lethal and mutagenic effects of ionizing radiation and many other DNA damaging agents. This resistance has been attributed to its highly proficient DNA repair capacity. Recent molecular biological analysis revealed that the 
genome has novel components that are involved in DNA repair. On the other hand, accumulating evidence indicates that some thermophilic archaebacteria also show resistance to ionizing radiation. In this article, we will discuss the radio-tolerance of organisms from an evolutional standpoint.
, 
or 
gene product for UV resistance in Tanaka, Masashi*; Narumi, Issei; Funayama, Tomoo; Kikuchi, Masahiro; Watanabe, Hiroshi*; Matsunaga, Tsukasa*; Nikaido, Osamu*; Yamamoto, Kazuo*
Journal of Bacteriology, 187(11), p.3693 - 3697, 2005/06
Times Cited Count：47 Percentile：62.08(Microbiology)no abstracts in English
Kobayashi, Yasuhiko; Narumi, Issei; Sato, Katsuya; Funayama, Tomoo; Kikuchi, Masahiro; Kitayama, Shigeru; Watanabe, Hiroshi*
Uchu Seibutsu Kagaku, 18(3), p.134 - 135, 2004/11
no abstracts in English
Hayashi, Hirotaka; Narumi, Issei; Wada, Seiichi; Kikuchi, Masahiro; Furuta, Masakazu*; Uehara, Kaku*; Watanabe, Hiroshi*
Journal of Plant Physiology, 161(10), p.1101 - 1106, 2004/10
Times Cited Count：10 Percentile：23.05(Plant Sciences)The resistance of strains Z (wild type) and SM-ZK (chloroplast-deficient mutant) to ionizing radiation was investigated. The colony forming ability of 
strain Z was higher than that of strain SM-ZK after -irradiation. For both strains, the resistance of light-grown cells was higher than that of dark-grown cells, suggesting that the light conditions during the culture contribute to the radiation resistance of . The comet assay showed that the ability of rejoining DNA double-strand breaks (dsb) was much higher in the light-grown cells. These results suggest that possesses a light-induced repair system to cope with DNA dsb.
that stimulates DNA ligationNarumi, Issei; Sato, Katsuya; Cui, S.*; Funayama, Tomoo; Kitayama, Shigeru; Watanabe, Hiroshi*
Molecular Microbiology, 54(1), p.278 - 285, 2004/10
Times Cited Count：133 Percentile：91.40(Biochemistry & Molecular Biology)The extraordinary radiation resistance of results from the efficient capacity of the bacterium to repair DNA double-strand breaks. By analyzing the DNA damage repair-deficient mutant, KH311, a unique radiation-inducible gene (designated 
) responsible for loss of radiation resistance was identified. Investigations in vitro showed that the gene product of (PprA) preferentially bound to double-stranded DNA carrying strand breaks, inhibited 
exonuclease III activity, and stimulated the DNA end-joining reaction catalyzed by ATP-dependent and NAD-dependent DNA ligases. These results suggest that has a radiation-induced nonhomologous end-joining repair mechanism in which PprA plays a critical role.
to ion beam radiationHayashi, Hirotaka*; Wada, Seiichi; Funayama, Tomoo; Narumi, Issei; Kobayashi, Yasuhiko; Watanabe, Hiroshi*; Furuta, Masakazu*; Uehara, Kaku*
Journal of Eukaryotic Microbiology, 51(3), p.321 - 324, 2004/06
Times Cited Count：5 Percentile：6.58(Microbiology)no abstracts in English
UV-endonuclease 
Kitayama, Shigeru; Narumi, Issei; Funayama, Tomoo; Watanabe, Hiroshi
Bioscience Biotechnology and Biochemistry, 67(3), p.613 - 616, 2003/03
Times Cited Count：3 Percentile：13.16(Biochemistry & Molecular Biology)no abstracts in English
Sato, Katsuya; Narumi, Issei; Kikuchi, Masahiro; Kitayama, Shigeru; Yanagisawa, Tadashi*; Yamamoto, Kazuo; Watanabe, Hiroshi
Journal of Biochemistry, 131(1), p.121 - 129, 2002/01
Times Cited Count：25 Percentile：38.47(Biochemistry & Molecular Biology)RecA protein is considered to be the most important participant in the radiation resistance of . We identified a new 
mutation (
) in the DNA-repair deficient mutant strain KI696, the phenotype of which is remarkably different from mutant strain rec30 carrying 
. In vitro, neither RecA424 nor RecA670 could promote DNA strand exchange, indicating that both RecA424 and Rec670 are defective in recombination activity. RecA424 promoted the autocleavage reaction of LexA in vitro, whereas RecA670 did not. The LexA level in KI696 was decreased following -irradiation. However, the LexA level in strain rec30 was constant irrespective of irradiation. These results indicate that RecA424 retains co-protease activity, whereas RecA670 does not. While strain rec30 is extremely radiation sensitive, strain KI696 is only slightly sensitive. Together, these observations suggest that the co-protease activity rather than the recombination activity of RecA contributes to the radiation resistance in .
is not involved in RecA induction following irradiationNarumi, Issei; Sato, Katsuya; Kikuchi, Masahiro; Funayama, Tomoo; Yanagisawa, Tadashi*; Kobayashi, Yasuhiko; Watanabe, Hiroshi; Yamamoto, Kazuo
Journal of Bacteriology, 183(23), p.6951 - 6956, 2001/12
Times Cited Count：91 Percentile：84.20(Microbiology)The involvement of LexA in induction of RecA was investigated in . As in the wild-type strain, an increase in RecA protein synthesis following irradiation was detected in a 
disruptant, indicating that LexA is not involved in the induction of RecA in .
Haga, Yoshinori; Inada, Yoshihiko*; Harima, Hisatomo*; Oikawa, Kenichi*; Murakawa, Masao*; Nakawaki, Hirokazu*; Tokiwa, Yoshifumi; Aoki, Dai*; Shishido, Hiroaki*; Ikeda, Shugo*; et al.
Physical Review B, 63(6), p.060503_1 - 060503_4, 2001/02
Times Cited Count：145 Percentile：97.42(Materials Science, Multidisciplinary)We observed the de Haas-van Alphen oscillation in the heavy fermion compound CeIrIn5. The topology of the Fermi surface is found to be neary cylindrical, reflecting the unique tetragonal structure. Observed branches are well explained by the 4f-itinerant band model. The cyclotron masses are large, 20-30 m0, which are one order larger than the corresponding band masses.
Kitayama, Shigeru*; Narumi, Issei; Kikuchi, Masahiro; Watanabe, Hiroshi
Mutation Research; DNA Repair, 461(3), p.179 - 187, 2000/11
no abstracts in English
Tokiwa, Yoshifumi; Harima, Hisatomo*; Aoki, Dai*; Nogiri, Sayaka*; Murakawa, Masao*; Miyake, Kosaku*; Watanabe, Narumi*; Settai, Rikio*; Inada, Yoshihiko*; Sugawara, Hitoshi*; et al.
Journal of the Physical Society of Japan, 69(4), p.1105 - 1112, 2000/04
Times Cited Count：21 Percentile：71.83(Physics, Multidisciplinary)no abstracts in English
Kobayashi, Yasuhiko; Watanabe, Hiroshi; Kikuchi, Masahiro; Narumi, Issei
Advances in Space Research, 25(10), p.2103 - 2106, 2000/00
Times Cited Count：10 Percentile：80.36(Engineering, Aerospace)no abstracts in English
Kikuchi, Masahiro; Narumi, Issei; Kitayama, Shigeru*; Watanabe, Hiroshi; Yamamoto, Kazuo*
FEMS Microbiol. Lett., 174, p.151 - 157, 1999/00
Times Cited Count：16 Percentile：32.88(Microbiology)no abstracts in English
