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Search Results: Records 1-17 displayed on this page of 17
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Journal Articles

Chemical characterization of a volatile dubnium compound, DbOCl$$_3$$

Chiera, N. M.*; Sato, Tetsuya; Eichler, R.*; Tomitsuka, Tomohiro; Asai, Masato; Adachi, Sadia*; Dressler, R.*; Hirose, Kentaro; Inoue, Hiroki*; Ito, Yuta; et al.

Angewandte Chemie; International Edition, 60(33), p.17871 - 17874, 2021/08

https://doi.org/10.1002/anie.202102808
 Times Cited Count：2 Percentile：14.88(Chemistry, Multidisciplinary)

The formation and the chemical characterization of single atoms of dubnium (Db, element 105), in the form of its volatile oxychloride, was investigated using the on-line gas phase chromatography technique, in the temperature range 350 - 600 $$^circ$$C. Under the exact same chemical conditions, comparative studies with the lighter homologs of group-5 in the Periodic Table clearly indicate the volatility sequence being NbOCl$$_3 > $$ TaOCl$$_3 geq$$ DbOCl$$_3$$. From the obtained experimental results, thermochemical data for DbOCl$$_3$$ were derived. The present study delivers reliable experimental information for theoretical calculations on the chemical properties of transactinides.

Journal Articles

Optimization of an isothermal gas-chromatographic setup for the chemical exploration of dubnium (Db, Z = 105) oxychlorides

Chiera, N. M.; Sato, Tetsuya; Tomitsuka, Tomohiro; Asai, Masato; Ito, Yuta; Shirai, Kaori*; Suzuki, Hayato; Tokoi, Katsuyuki; Toyoshima, Atsushi; Tsukada, Kazuaki; et al.

Journal of Radioanalytical and Nuclear Chemistry, 320(3), p.633 - 642, 2019/06

https://doi.org/10.1007/s10967-019-06505-w
 Times Cited Count：1 Percentile：11.15(Chemistry, Analytical)

An isothermal gas-chromatographic (IGC) device has been developed and tested for on-line gas phase studies of volatile oxychlorides of short-lived group-5 transition metals. Radioisotopes of niobium and tantalum, produced in nuclear fusion evaporation reactions, are directly flushed into the IGC setup by an inert gas-jet. Oxychloride compounds are formed by the addition of SOCl$$_2$$ and O$$_2$$. Parameters influencing the formation and transport of NbOCl$$_3$$ and TaOCl$$_3$$ are investigated. For nuclides with half-lives ($$t_{1/2}$$) of about 30 s, an overall efficiency of 7% is obtained, rendering the IGC setup suitable for the chemical exploration of $$^{262}$$Db($$t_{1/2}$$ = 34s).

Journal Articles

Evaluation of the relative biological effectiveness of carbon ion beams in the cerebellum using the rat organotypic slice culture system

Yoshida, Yukari*; Suzuki, Yoshiyuki*; Al-Jahdari, W. S.*; Hamada, Nobuyuki*; Funayama, Tomoo; Shirai, Katsuyuki*; Kato, Hiroyuki*; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Nakano, Takashi*

Journal of Radiation Research, 53(1), p.87 - 92, 2012/02

https://doi.org/10.1269/jrr.11139A
 Times Cited Count：8 Percentile：41.9(Biology)

Journal Articles

Effectiveness of carbon-ion beams for apoptosis induction in rat primary immature hippocampal neurons

Kaminuma, Takuya*; Suzuki, Yoshiyuki*; Shirai, Katsuyuki*; Mizui, Toshiyuki*; Noda, Shinei*; Yoshida, Yukari*; Funayama, Tomoo; Takahashi, Takeo*; Kobayashi, Yasuhiko; Shirao, Tomoaki*; et al.

Journal of Radiation Research, 51(6), p.627 - 631, 2010/11

https://doi.org/10.1269/jrr.10050
 Times Cited Count：9 Percentile：33.86(Biology)

Journal Articles

Research into the radiosensitivity of normal brain tissue

Suzuki, Yoshiyuki*; Yoshida, Yukari*; Shirai, Katsuyuki*; Hamada, Nobuyuki*; Mizui, Toshiyuki*; Noda, Shinei*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Shirao, Tomoaki*; et al.

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 107, 2007/02

https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2006-042.pdf

Journal Articles

Differential effects of X-irradiation on immature and mature hippocampal neurons in vitro

Shirai, Katsuyuki*; Mizui, Toshiyuki*; Suzuki, Yoshiyuki*; Kobayashi, Yasuhiko; Nakano, Takashi*; Shirao, Tomoaki*

Neuroscience Letters, 399(1-2), p.57 - 60, 2006/05

https://doi.org/10.1016/j.neulet.2006.01.048
 Times Cited Count：21 Percentile：34.97(Neurosciences)

no abstracts in English

Oral presentation

Comparison of biological effects induced by X-rays and heavy ions in the organotypic slice cultures of the rat cerebellum

Yoshida, Yukari*; Suzuki, Yoshiyuki*; Hamada, Nobuyuki*; Shirai, Katsuyuki*; Noda, Shinei*; Al-Jahdari, W. S.*; Funayama, Tomoo; Sakashita, Tetsuya; Wada, Seiichi*; Kobayashi, Yasuhiko; et al.

no journal, , 

no abstracts in English

Oral presentation

Effects of X-ray and carbon ion beam on the postnatal cerebellum in organotypic slice cultures

Suzuki, Yoshiyuki*; Shirai, Katsuyuki*; Yoshida, Yukari*; Mizui, Toshiyuki*; Kiyohara, Hiroki*; Noda, Shinei*; Ishizaki, Yasuki*; Ozawa, Seiji*; Nakano, Takashi*; Hamada, Nobuyuki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Apoptosis induced by heavy charged particles in cultured premature rat neurons

Suzuki, Yoshiyuki*; Shirai, Katsuyuki*; Mizui, Toshiyuki*; Hamada, Nobuyuki*; Noda, Shinei*; Funayama, Tomoo; Yoshida, Yukari*; Kobayashi, Yasuhiko; Shirao, Tomoaki*; Nakano, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Effect of X-ray and carbon ion beam on the postnatal cerebellum in organotypic slice culture

Yoshida, Yukari*; Suzuki, Yoshiyuki*; Hamada, Nobuyuki*; Shirai, Katsuyuki*; Al-Jahdari, W. S.*; Kobayashi, Yasuhiko; Ozawa, Seiji*; Nakano, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Effects of X-ray and carbon ion beam on the postnatal cerebellum in organotypic slice cultures

Yoshida, Yukari*; Suzuki, Yoshiyuki*; Takeuchi, Aiko*; Hamada, Nobuyuki*; Shirai, Katsuyuki*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Ozawa, Seiji*; Nakano, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Relative biological effectiveness value of carbon ion beam to X-ray on immature hippocampal neurons in vitro

Suzuki, Yoshiyuki*; Shirai, Katsuyuki*; Mizui, Toshiyuki*; Hamada, Nobuyuki*; Noda, Shinei*; Funayama, Tomoo; Yoshida, Yukari*; Kobayashi, Yasuhiko; Shirao, Tomoaki*; Nakano, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Growth cone collapse assay approach to examine sensitivity of cell neurons to carbon beams

Al-Jahdari, W. S.*; Suzuki, Yoshiyuki*; Yoshida, Yukari*; Hamada, Nobuyuki*; Noda, Shinei*; Shirai, Katsuyuki*; Funayama, Tomoo; Sakashita, Tetsuya; Sakurai, Hideyuki*; Kobayashi, Yasuhiko; et al.

no journal, , 

Oral presentation

Biological effectiveness of carbon ions for apoptosis induction in cultured rat premature neurons

Shirai, Katsuyuki*; Suzuki, Yoshiyuki*; Mizui, Toshiyuki*; Hamada, Nobuyuki*; Noda, Shinei*; Funayama, Tomoo; Yoshida, Yukari*; Kobayashi, Yasuhiko; Shirao, Tomoaki*; Nakano, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Biological effects of carbon ion beams on the postnatal cerebellum in organotypic slice cultures

Yoshida, Yukari*; Suzuki, Yoshiyuki*; Hamada, Nobuyuki*; Shirai, Katsuyuki*; Al-Jahdari, W. S.*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Ozawa, Seiji*; Nakano, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Neuronal sensitivity to carbon beams; Approach using growth cone collapse assay

Al-Jahdari, W. S.*; Suzuki, Yoshiyuki*; Yoshida, Yukari*; Hamada, Nobuyuki*; Noda, Shinei*; Shirai, Katsuyuki*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Nakano, Takashi*

no journal, , 

Oral presentation

On-line isothermal gas chromatographic behavior of oxychlorides of group-5 elements, Nb, Ta, and Db

Sato, Tetsuya; Chiera, N. M.*; Tomitsuka, Tomohiro; Tokoi, Katsuyuki*; Suzuki, Hayato*; Ito, Yuta; Asai, Masato; Shirai, Kaori*; Inoue, Hiroki*; Adachi, Sadia*; et al.

no journal, , 

The influence of strong relativistic effects on chemical properties has been interesting in the superheavy element region. Their chemical properties, however, have not been investigated sufficiently because of experimental difficulties owing to their low production rates and short half-lives. In order to elucidate the chemical properties of dubnium (Db, Z = 105), we have conducted on-line isothermal gas chromatographic experiments of oxychloride of group-5 elements. We confirmed the formation of volatile oxychlorides of Db and its lighter homologs Nb and Ta by using $$^{262}$$Db (half-life, $$T_{1/2}$$ = 33.8 s), $$^{88}$$Nb ($$T_{1/2}$$ = 14.5 min.), and $$^{170}$$Ta ($$T_{1/2}$$ = 6.76 min.), respectively. We successfully determined the adsorption enthalpies of the oxychlorides of each element on the quartz surface from their isothermal gas chromatographic behavior. The obtained volatility sequence of the group-5 elements is found to be Nb $$>$$ Ta $$geq$$ Db.

17 (Records 1-17 displayed on this page)
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