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Journal Articles

Production of $$^{13}$$N-labeled nitrogen gas tracer for the imaging of nitrogen fixation in soybean nodules

Ishii, Satomi; Igura, Masato*; Yin, Y.-G.; Hung, N. V. P.*; Suzui, Nobuo; Kawachi, Naoki; Koyanagi, Atsushi*; Oyama, Takuji*; Fujimaki, Shu

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 98, 2014/03

Journal Articles

Analysis of the effect of O$$_{2}$$ partial pressure on nitrogen fixation in soybean plant using positron-emitting tracer

Hung, N. V. P.; Ishii, Satomi; Suzui, Nobuo; Kawachi, Naoki; Yin, Y.-G.; Koyanagi, Atsushi; Oyama, Takuji*; Fujimaki, Shu

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 99, 2014/03

The impacts of oxygen in rhizosphere on the symbiotic nitrogen fixation in real-time was evaluated under various O$$_{2}$$ partial pressure. Soybean nodules were treated with mixed gas containing N$$_{2}$$ labeled with a radioisotope $$^{13}$$N and various concentrations of O$$_{2}$$, and the nitrogen fixation activity in the nodules was visualized by the positron-emitting tracer imaging system (PETIS). The results showed that under normal condition the nitrogen fixation ability of soybean plant was higher compared to that of under the other conditions (0% O$$_{2}$$ and 10% O$$_{2}$$). There was no significant difference in the nitrogen fixation activity between 0% O$$_{2}$$ and 10% O$$_{2}$$.

Journal Articles

Quantitative analysis of the initial transport of fixed nitrogen in nodulated soybean plants using $$^{15}$$N as a tracer

Hung, N. V. P.*; Watanabe, Shiori*; Ishikawa, Shinji*; Otake, Norikuni*; Sueyoshi, Kuni*; Sato, Takashi*; Ishii, Satomi; Fujimaki, Shu; Oyama, Takuji*

Soil Science and Plant Nutrition, 59(6), p.888 - 895, 2013/12

 Times Cited Count:4 Percentile:17.96(Plant Sciences)

Journal Articles

Effect of nitrate on nodulation and nitrogen fixation of soybean

Oyama, Takuji; Fujikake, Hiroyuki*; Yashima, Hiroyuki*; Tanabata, Sayuri*; Ishikawa, Shinji*; Sato, Takashi*; Nishiwaki, Toshikazu*; Otake, Norikuni*; Sueyoshi, Kuni*; Ishii, Satomi; et al.

Soybean Physiology and Biochemistry, p.333 - 364, 2011/11

no abstracts in English

Journal Articles

Regulation of root nodule formation in leguminous plants

Ito, Sayuri; Fujimaki, Shu; Kato, Taichi*; Otake, Norikuni*; Sueyoshi, Kuni*; Oyama, Takuji*

Nitrogen assimilation in plants, p.205 - 214, 2010/07

Journal Articles

$$^{14}$$C concentration in tree rings of beech trees living near CO$$_{2}$$ vents in the Hakkoda Cardera, Aomori, Japan

Horiuchi, Kazuho*; Chiba, Takuji*; Hoshino, Yasuharu*; Oyama, Motonari*; Tanaka, Takayuki; Amano, Hikaru*

JAEA-Conf 2010-001, p.71 - 74, 2010/03

We investigated how volcanic CO$$_{2}$$ emission affects the $$^{14}$$C concentrations in tree rings of beech trees in the Hakkoda Caldera in Aomori, which is one of high emission regions of volcanic CO$$_{2}$$ in the world. There was a tendency that the obtained $$^{14}$$C concentrations were, surprisingly, quite near to the values of the concurrent atmospheric CO$$_{2}$$ and decreased from 1991 to 2001. The $$^{14}$$C concentrations in caldera are lower than those of the control samples taken from a beech living outside of the caldera. We revealed the possibility that we can solve the local dynamics of fossil CO$$_{2}$$ emission using $$^{14}$$C in tree rings. However, the maximum difference of $$^{14}$$C between inside and outside of the caldera was 14 permil. This result showed that the volcanic CO$$_{2}$$ mixed with atmospheric CO$$_{2}$$ by 4.4 ppm or less. As the trunk absorbing CO$$_{2}$$ exist in height that is several meters higher than the volcanic CO$$_{2}$$ vents, the low mixing may occur.

Journal Articles

Imaging of the nodule function in leguminous plants who utilize nitrogen gas in the air as nutrition

Fujimaki, Shu; Ishii, Satomi; Oyama, Takuji*

Hoshasen To Sangyo, (124), p.32 - 35, 2009/12

The nodule is a symbiotic organ developed on roots of leguminous plants which have been infected with rhizobia, a group of soil bacteria. The plants with nodules can obtain nitrogen nutrition as ammonia converted from nitrogen gas in the air by rhizobia in the nodules. This function, "symbiotic nitrogen fixation", plays a fundamental role in the food production in the world. Recently, we reported that we have successfully visualized the symbiotic nitrogen fixation in soybean plants non-invasively using a positron-emitting tracer imaging system (PETIS) and nitrogen-13-labelled nitrogen gas tracer. In this article, this study is described with the scientific and social backgrounds.

Journal Articles

The Production of $$^{13}$$N-labeled nitrogen gas tracer and the imaging of nitrogen fixation in soybean nodules

Ishii, Satomi; Suzui, Nobuo; Ito, Sayuri; Ishioka, Noriko; Kawachi, Naoki; Matsuhashi, Shimpei; Otake, Norikuni*; Oyama, Takuji*; Fujimaki, Shu

JAEA-Review 2009-041, JAEA Takasaki Annual Report 2008, P. 106, 2009/12

Journal Articles

Real-time imaging of nitrogen fixation in an intact soybean plant with nodules using $$^{13}$$N-labeled nitrogen gas

Ishii, Satomi; Suzui, Nobuo; Ito, Sayuri; Ishioka, Noriko; Kawachi, Naoki; Otake, Norikuni*; Oyama, Takuji*; Fujimaki, Shu

Soil Science and Plant Nutrition, 55(5), p.660 - 666, 2009/10

 Times Cited Count:12 Percentile:38.66(Plant Sciences)

Journal Articles

The Present status of TIARA at JAEA-Takasaki

Saito, Yuichi; Yokota, Wataru; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Uno, Sadanori; Ishibori, Ikuo; Kurashima, Satoshi; Yoshida, Kenichi; Yuyama, Takahiro; et al.

Proceedings of the 8th International Workshop on Radiation Effects on Semiconductor Devices for Space Applications (RASEDA-8), p.95 - 98, 2008/12

Journal Articles

The Production of $$^{13}$$N-labeled nitrogen gas for imaging of nitrogen fixation by soybean nodule

Ishii, Satomi; Suzui, Nobuo; Ishioka, Noriko; Kawachi, Naoki; Matsuhashi, Shimpei; Otake, Norikuni*; Oyama, Takuji*; Fujimaki, Shu

JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 111, 2008/11

Journal Articles

Operation of the electron accelerators and $$gamma$$-ray irradiation facilities

Kaneko, Hirohisa; Hanaya, Hiroaki; Haneda, Noriyuki; Yamagata, Ryohei; Seito, Hajime; Kanazawa, Takao; Kojima, Takuji; Koyama, Shigeru*; Yamaguchi, Toshiyuki*; Kawashima, Ikuo*; et al.

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 209, 2008/03

The accelerator served mainly for graft-polymerization for new material development, radiation effect study on semiconductors, and various experiments of outside users. The annual operation time for the electron accelerator is 597.4h(517h for vertical beams, 80.4h for horizontal beams) The Co-60 $$gamma$$-ray irradiation facilities consist of three buildings (8 rooms) and cover a wide dose-rate range from 0.04Gy/h to 20kGy/h with eight irradiation cells. The annual operation time for the cobalt first, second irradiation facilities and food irradiation facility is 20,844 h, 6,335 h and 3,150 h.

Journal Articles

Utilization of the electron accelerator and $$gamma$$-ray irradiation facilities

Kojima, Takuji; Kaneko, Hirohisa; Haneda, Noriyuki; Hanaya, Hiroaki; Yamagata, Ryohei; Seito, Hajime; Kanazawa, Takao; Koyama, Shigeru*; Yamaguchi, Toshiyuki*; Kawashima, Ikuo*; et al.

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 208, 2008/03

An electron accelerator and three $$gamma$$ ray irradiation facilities were operated for various research subjects as operation plan in FY 2006 without serious trouble. The number of research subjects for the No.1 accelerator, the Cobalt No.1 facility, the Cobalt No.2 facility, and the Food irradiation facility, is 544, 159, 622, and 357, respectively.

Journal Articles

Interaction between nitrogen nutrients acquisition function and distribution of photosynthetic products

Oyama, Takuji*; Sueyoshi, Kuni*; Otake, Norikuni*; Ito, Sayuri*; Ishibashi, H.*; Hara, T.*; Kimura, T.*; Matsuhashi, Shimpei; Fujimaki, Shu; Suzui, Nobuo; et al.

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 122, 2007/02

Journal Articles

Positron Emitting Tracer Imaging System (PETIS) as a tool for plant physiology

Mori, Satoshi*; Nakanishi, Tomoko*; Hayashi, Hiroaki*; Oyama, Takuji*; Uchida, Hiroshi*; Matsuhashi, Shimpei; Sekine, Toshiaki

Radioisotopes, 50(9), p.408 - 418, 2001/09

no abstracts in English

Oral presentation

Imaging of nitrogen fixation in nodulated legume by using $$^{13}$$N$$_{2}$$

Ishii, Satomi; Otake, Norikuni*; Ishioka, Noriko; Suzui, Nobuo; Fujimaki, Shu; Matsuhashi, Shimpei; Oyama, Takuji*

no journal, , 

no abstracts in English

Oral presentation

The Synthesis of 13N labeled nitrogen gas for imaging of nitrogen fixation by soybean nodule

Ishii, Satomi; Suzui, Nobuo; Ishioka, Noriko; Kawachi, Naoki; Ito, Sayuri; Otake, Norikuni*; Oyama, Takuji*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

The Synthesis of $$^{13}$$N labeled nitrogen gas for imaging of nitrogen fixation by soybean nodule

Ishii, Satomi; Suzui, Nobuo; Ishioka, Noriko; Kawachi, Naoki; Matsuhashi, Shimpei; Fujimaki, Shu; Otake, Norikuni*; Oyama, Takuji*

no journal, , 

no abstracts in English

Oral presentation

Noninvasive imaging of nitrogen fixation in soybean nodules

Ishii, Satomi; Suzui, Nobuo; Ito, Sayuri; Kawachi, Naoki; Ishioka, Noriko; Otake, Norikuni*; Oyama, Takuji*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Real-time imaging of nitrogen fixation in an intact soybean plant

Ishii, Satomi; Suzui, Nobuo; Ito, Sayuri; Ishioka, Noriko; Kawachi, Naoki; Otake, Norikuni*; Oyama, Takuji*; Fujimaki, Shu

no journal, , 

41 (Records 1-20 displayed on this page)