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Journal Articles

Improvement of symbiotic performance of ${it Sinorhizobium}$ with ${it Vigna marina}$ under high salt conditions using the ion beam mutation breeding

Maruyama, Yudai*; Takeda, Kiyoko*; Tomooka, Norihiko*; Sato, Katsuya; Ono, Yutaka; Yokoyama, Tadashi*

JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 99, 2016/02

Journal Articles

Nitrogen K-edge X-ray absorption near edge structure of pyrimidine-containing nucleotides in aqueous solution

Shimada, Hiroyuki*; Minami, Hirotake*; Okuizumi, Naoto*; Sakuma, Ichiro*; Ukai, Masatoshi*; Fujii, Kentaro; Yokoya, Akinari; Fukuda, Yoshihiro*; Saito, Yuji

Journal of Chemical Physics, 142(17), p.175102_1 - 175102_9, 2015/05

AA2015-0073.pdf:1.15MB

 Times Cited Count:10 Percentile:38.84(Chemistry, Physical)

Journal Articles

Genome analysis of the high temperature tolerant mutant of ${it Bradyrhizobium japonicum}$ USDA110 generated by ion-beam irradiation

Takeda, Kiyoko*; Sato, Katsuya; Narumi, Issey*; Ono, Yutaka; Otsu, Naoko*; Yokoyama, Tadashi*

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 120, 2015/03

Journal Articles

Nitrogen K-edge X-ray absorption near edge structure (XANES) spectra of purine-containing nucleotides in aqueous solution

Shimada, Hiroyuki*; Fukao, Taishi*; Minami, Hirotake*; Ukai, Masatoshi*; Fujii, Kentaro; Yokoya, Akinari; Fukuda, Yoshihiro*; Saito, Yuji

Journal of Chemical Physics, 141(5), p.055102_1 - 055102_8, 2014/08

 Times Cited Count:15 Percentile:54.25(Chemistry, Physical)

Journal Articles

Identification of DNA mutation sites in a high temperature tolerant mutant of ${it Bradyrhizobium japonicum}$ USDA110 generated by ion-beam irradiation

Takeda, Kiyoko; Sato, Katsuya; Narumi, Issey*; Otsu, Naoko*; Yokoyama, Tadashi*

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 114, 2014/03

Journal Articles

Structural changes of nucleic acid base in aqueous solution as observed in X-ray absorption near edge structure (XANES)

Shimada, Hiroyuki*; Fukao, Taishi*; Minami, Hirotake*; Ukai, Masatoshi*; Fujii, Kentaro; Yokoya, Akinari; Fukuda, Yoshihiro*; Saito, Yuji

Chemical Physics Letters, 591, p.137 - 141, 2014/01

 Times Cited Count:8 Percentile:33.58(Chemistry, Physical)

Journal Articles

Phenotypic characterization of high temperature tolerant mutants of ${it Bradyrhizobium japonicum}$ USDA110 generated by ion-beam irradiation

Takeda, Kiyoko; Tejima, Kohei*; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*

JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 107, 2013/01

Journal Articles

Colony morphology of high temperature tolerant mutants of ${it Bradyrhizobium japonicum}$ USDA 110 obtained by ion-beam microbial mutation-breeding technology

Takeda, Kiyoko; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*

JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 110, 2012/01

JAEA Reports

Reports of JAEA's Reimei Research Program; April 1, 2009 - March 31, 2010

Nagame, Yuichiro

JAEA-Review 2010-071, 47 Pages, 2011/02

JAEA-Review-2010-071.pdf:2.56MB

The summaries of the 8 research projects conducted through the Reimei Research Program are published for the growth and development of the new researches.

Journal Articles

Phenotypic improvement of ${it Bradyrhizobium japonicum}$ USDA 110 into a high temperature tolerant strain in terms of ion-beam microbial mutation-breeding technology

Takeda, Kiyoko*; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 75, 2011/01

Journal Articles

The Effect of $$gamma$$-sterilization of carrier materials on the shelf life of biofertilizer

Tejima, Kohei; Yokoyama, Tadashi*; Sato, Katsuya; Narumi, Issei

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 83, 2011/01

no abstracts in English

Journal Articles

Synchrotron radiation photoelectron studies for primary radiation effects using a liquid water jet in vacuum; Total and partial photoelectron yields for liquid water mear the oxygen $$K$$-edge

Ukai, Masatoshi*; Yokoya, Akinari; Nonaka, Yusuke*; Fujii, Kentaro; Saito, Yuji

Radiation Physics and Chemistry, 78(12), p.1202 - 1206, 2009/12

 Times Cited Count:5 Percentile:35.99(Chemistry, Physical)

To substantiate the hydrated structure of DNA from the view point of the electronic properties, we developed a new spectroscopic technique of photoelectrons ejected from solutions dissolving biological molecules using soft X-ray synchrotron radiation in combination with liquid jet in vacuum. The experiments are carried out at the BL23SU in SPring-8, Japan. The liquid sample is maintained in the form of continuous micro-beam ($$phi$$ = 20 $$mu$$m) in vacuum and is intersected by a well focused nearly micro-beam of synchrotron-radiation of less than 50 $$mu$$m. In this paper, we present (1) the partial yields of photoelectrons for liquid water molecules and oxygen Auger electron spectra in the energy range around the oxygen K-edge, and (2) the total photoelectron yields for DNA nucleotides (AMP, CMP, and GMP) in water solutions near nitrogen K-edge, which correspond to the X-ray absorption spectra (XANES).

JAEA Reports

Reports of JAEA's Reimei Research Program; April 1, 2008 - March 31, 2009

Ikezoe, Hiroshi

JAEA-Review 2009-026, 55 Pages, 2009/09

JAEA-Review-2009-026.pdf:25.45MB

The summaries of the 8 research projects conducted through the Reimei Research Program are published for the growth and development of the new researches.

Journal Articles

A Large scale network visualization for important nodes discovery

Miyamura, Hiroko; Ozahata, Satoshi*; Nakao, Akihiro*; Kawashima, Konosuke*; Suzuki, Yoshio

Shingaku Giho, 109(188), p.85 - 90, 2009/09

We propose a network visualization method for a large-scale file-sharing network dataset. The network dataset has nodes and links that represent the connection between two nodes. When the number of links is large, it is difficult to recognize the structure of the network data, because many links are crossed. In this context, for recognizing the structure and exploring the key nodes, we propose a link-less network visualization method using matrix based representation. In addition, we demonstrate the effectiveness of the proposed method by applying it to the file-sharing network log data.

Journal Articles

Optical emission spectroscopy of excited atoms sputtered on a Ti surface under irradiation with multicharged Ar ions

Motohashi, Kenji*; Saito, Yuichi; Kitazawa, Sin-iti

Journal of Physics; Conference Series, 163, p.012079_1 - 012079_4, 2009/06

 Times Cited Count:5 Percentile:84.83

JAEA Reports

Report on JAEA's Reimei Research Program

Ikezoe, Hiroshi

JAEA-Review 2008-066, 55 Pages, 2009/02

JAEA-Review-2008-066.pdf:6.37MB

The summaries of the 9 research subjects conducted through the Reimei Research Program are published for the growth and development of the new researches.

Journal Articles

X-ray absorption spectrum for guanosine-5'-monophosphate in water solution in the vicinity of the nitrogen K-edge observed in free liquid jet in vacuum

Ukai, Masatoshi*; Yokoya, Akinari; Fujii, Kentaro; Saito, Yuji

Radiation Physics and Chemistry, 77(10-12), p.1265 - 1269, 2008/10

 Times Cited Count:11 Percentile:59.25(Chemistry, Physical)

In order to substantiate the hydrated structure of DNA from the view point of the electronic properties, we develop a new spectroscopic technique for the photoelectrons ejected from solutions dissolving biological molecules using a soft X-ray synchrotron radiation (SPring-8, BL23SU) in combination with liquid jet technique in vacuum. In this paper, we present the first evidence of the spectrum of total photoelectron yields for a nucleotide, guanosine-5'-monophosphate, in solution in the energy region of so-called water window around nitrogen K-edge. A liquid nucleotide/water sample is maintained in the form of continuous thin water jet (diameter $$sim$$ 20 $$mu$$m) in vacuum and is intersected by a highly focused soft X-ray beam. The obtained spectrum in solution shows common features with the spectrum in solid film. Nitrogen atoms only exist in the base site, so that the spectral similarities can be explained by the hydrophobic property of the base site.

Journal Articles

Visualization of chemical modification of pore internal surfaces using fluorescence microscopy

Maekawa, Yasunari; Suzuki, Yasuyuki; Maeyama, Katsuya*; Yonezawa, Noriyuki*; Yoshida, Masaru

Chemistry Letters, 33(2), p.150 - 151, 2004/02

 Times Cited Count:4 Percentile:21.76(Chemistry, Multidisciplinary)

Since well-characterized chemical modification of pore inner surfaces in polymer membranes should be very important from the view point of synthetic chemistry of polymer surfaces as well as designing materials for application such as separation membranes and nanoscopic electronic devices, we reported herein the chemical modification of internal surfaces of the cylindrical pores with 0.31 and 0.54 $$mu$$m in diameter through the reaction of the carboxylic acids on the surfaces with the alkylation reagent bearing a pyrene fluorophore. The incorporation of the fluorophore on the pore internal surfaces were successfully confirmed by the fluorescence microscope images of the membrane reacting with the alkylation reagent bearing a pyrene fluorophore.

Journal Articles

Ion beam-induced positive imaging of polyimide via two step imidization

Maekawa, Yasunari; Suzuki, Yasuyuki; Yoshida, Masaru; Maeyama, Katsuya*; Yonezawa, Noriyuki*

Polymer, 44(8), p.2307 - 2312, 2003/04

 Times Cited Count:7 Percentile:29.01(Polymer Science)

The preparation of ion track membranes of thermally stable polyimide films has been performed by ion beam irradiation of partially imidized polyamic acid (PAA) films followed by alkaline etching and final imidization. No discernible positive hole patterns were observed on the irradiated films of partially imidized PAA containing sulfonyl linkages, although sulfonyl group is known to be highly sensitive to ion beams. In contrast, positive hole patterns appeared on the irradiated films of the partially imidized PAA with 68-89% imidization degrees that contains sulfonyl linkages along with a methylene group in the main chain. The most contrasty hole patterns with 0.3 $$mu$$m diameter were observed on the irradiated PAA films of 89% imidization degree. The irradiated PAA film with the hole patterns was then transformed to the corresponding polyimide film with curing at 350$$^{circ}$$C for 1 h. From the structural comparison of the polyimides, the possible mechanism for the hole pattern formation is suggested.

Journal Articles

Ion-beam-induced dual-tone imaging of polyimide via two step imidization

Suzuki, Yasuyuki; Maekawa, Yasunari; Yoshida, Masaru; Maeyama, Katsuya*; Yonezawa, Noriyuki*

Chemistry of Materials, 14(10), p.4186 - 4191, 2002/10

 Times Cited Count:17 Percentile:53.66(Chemistry, Physical)

Dual tone imaging of polyimide films was prepared by Xe ion beam irradiation of partially imidized polyamic acid (PAA) films followed by alkaline etching in aqueous tetramethylammonium hydroxide solution and heating of treated films. In 87% imidized PAA film, ion beam irradiation produced a negative hemispheric structured image with 1.0 mm height and 1.5 mm diameter. In contrast, a positive hole pattern with 0.3 mm diameter appeared on the 82% imidized PAA film. Positive and negative images were considered to be switched by slight change in the balance of scission and crosslinking of the polymer chains, resulting from energy deposition of the ion beam.

42 (Records 1-20 displayed on this page)