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Journal Articles

Lethal and mutagenic effects of ion beams and $$gamma$$-rays in ${it Aspergillus oryzae}$

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:16 Percentile:49.39(Biotechnology & Applied Microbiology)

Journal Articles

Seismic safety logic on design and analysis for nuclear power plants

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

Journal Articles

Seismic safety logic on design and analysis for nuclear power plants

Ohashi, Hirotada*; Narumiya, Yoshiyuki*; Miyata, Koichi*; Watanabe, Norio

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 52(11), p.732 - 736, 2010/11

no abstracts in English

Journal Articles

Seismic safety logic on design and analysis for nuclear power plants

Ohashi, Hirotada*; Narumiya, Yoshiyuki*; Miyata, Koichi*; Watanabe, Norio

Anzen Kogaku Shimpojiumu 2010 Koen Yokoshu, p.110 - 113, 2010/07

no abstracts in English

Journal Articles

Analysis of mutagenic effect induced by ion beams for breeding of ${it Aspergillus oryzae}$

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

Journal Articles

Ion beam breeding of flower color variations in transgenic plants with multi-disease tolerance

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

Journal Articles

Radio-tolerance of organisms and its evolution

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. ${it Deinococcus radiodurans}$, 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 ${it D. radiodurans}$ 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.

Journal Articles

Characterization of pathways dependent on the ${it uvsE}$, ${it uvrA1}$ or ${it uvrA2}$ gene product for UV resistance in ${it Deinococcus radiodurans}$

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:43 Percentile:62.34(Microbiology)

no abstracts in English

Journal Articles

Radiation response mechanisms of the extremely radioresistant bacterium ${it Deinococcus radiodurans}$

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

Journal Articles

Light dependency of resistance to ionizing radiation in ${it Euglena gracilis}$

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:9 Percentile:23.26(Plant Sciences)

The resistance of ${it Euglena gracilis}$ strains Z (wild type) and SM-ZK (chloroplast-deficient mutant) to ionizing radiation was investigated. The colony forming ability of ${it E. gracilis}$ strain Z was higher than that of strain SM-ZK after $$gamma$$-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 ${it E. gracilis}$. 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 ${it E. gracilis}$ possesses a light-induced repair system to cope with DNA dsb.

Journal Articles

PprA; A Novel protein from ${it Deinococcus radiodurans}$ that stimulates DNA ligation

Narumi, Issei; Sato, Katsuya; Cui, S.*; Funayama, Tomoo; Kitayama, Shigeru; Watanabe, Hiroshi*

Molecular Microbiology, 54(1), p.278 - 285, 2004/10

 Times Cited Count:128 Percentile:91.45(Biochemistry & Molecular Biology)

The extraordinary radiation resistance of ${it Deinococcus radiodurans}$ 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 ${it pprA}$) responsible for loss of radiation resistance was identified. Investigations in vitro showed that the gene product of ${it pprA}$ (PprA) preferentially bound to double-stranded DNA carrying strand breaks, inhibited ${it Escherichia coli}$ exonuclease III activity, and stimulated the DNA end-joining reaction catalyzed by ATP-dependent and NAD-dependent DNA ligases. These results suggest that ${it D. radiodurans}$ has a radiation-induced nonhomologous end-joining repair mechanism in which PprA plays a critical role.

Journal Articles

Evaluation of the resistance of ${it Euglena gracilis}$ to ion beam radiation

Hayashi, 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:6.67(Microbiology)

no abstracts in English

Journal Articles

Cloning of structural gene of ${it Deinococcus radiodurans}$ UV-endonuclease $$beta$$

Kitayama, Shigeru; Narumi, Issei; Funayama, Tomoo; Watanabe, Hiroshi

Bioscience Biotechnology and Biochemistry, 67(3), p.613 - 616, 2003/03

 Times Cited Count:3 Percentile:13.21(Biochemistry & Molecular Biology)

no abstracts in English

Journal Articles

Characterization of RecA424 and RecA670 proteins from ${it Deinococcus radiodurans}$

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:38.65(Biochemistry & Molecular Biology)

RecA protein is considered to be the most important participant in the radiation resistance of ${it Deinococcus radiodurans}$. We identified a new ${it recA}$ mutation (${it recA424}$) in the DNA-repair deficient mutant strain KI696, the phenotype of which is remarkably different from mutant strain rec30 carrying ${it recA670}$. 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 $$gamma$$-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 ${it D. radiodurans}$.

Journal Articles

The LexA protein from ${it Deinococcus radiodurans}$ is not involved in RecA induction following $$gamma$$ irradiation

Narumi, 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:88 Percentile:83.87(Microbiology)

The involvement of LexA in induction of RecA was investigated in ${it Deinococcus radiodurans}$. As in the wild-type strain, an increase in RecA protein synthesis following $$gamma$$ irradiation was detected in a ${it lexA}$ disruptant, indicating that LexA is not involved in the induction of RecA in ${it D. radiodurans}$.

Journal Articles

Quasi-two-dimensional Fermi surfaces of the heavy fermion superconductor CeIrIn$$_5$$

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:97.43(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.

Journal Articles

Mutation in recR gene of Deinococcus radiodurans and possible in volvement of its product in the repair of DNA interstrand cross-links

Kitayama, Shigeru*; Narumi, Issei; Kikuchi, Masahiro; Watanabe, Hiroshi

Mutation Research; DNA Repair, 461(3), p.179 - 187, 2000/11

no abstracts in English

Journal Articles

Fermi surface properties of USi$$_{3}$$

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:71.92(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Effect of the space environment on the induction of DNA-repair related proteins and recovery from radiation damage

Kobayashi, Yasuhiko; Watanabe, Hiroshi; Kikuchi, Masahiro; Narumi, Issei

Advances in Space Research, 25(10), p.2103 - 2106, 2000/00

 Times Cited Count:10 Percentile:80.45(Engineering, Aerospace)

no abstracts in English

Journal Articles

Genomic organization of the radioresistant bacterium Deinococcus radiodurans; Physical map and evidence for multiple replicons

Kikuchi, Masahiro; Narumi, Issei; Kitayama, Shigeru*; Watanabe, Hiroshi; Yamamoto, Kazuo*

FEMS Microbiol. Lett., 174, p.151 - 157, 1999/00

 Times Cited Count:16 Percentile:33.13(Microbiology)

no abstracts in English

33 (Records 1-20 displayed on this page)