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and 
shell gap for Ti and V by the first high-precision multireflection time-of-flight mass measurements at BigRIPS-SLOWRIIimura, Shun*; Rosenbusch, M.*; Takamine, Aiko*; Tsunoda, Yusuke*; Wada, Michiharu*; Chen, S.*; Hou, D. S.*; Xian, W.*; Ishiyama, Hironobu*; Yan, S.*; et al.
Physical Review Letters, 130(1), p.012501_1 - 012501_6, 2023/01
Times Cited Count：5 Percentile：94.66(Physics, Multidisciplinary)
= 100 with a multireflection time-of-flight mass spectrographIto, Yuta*; Schury, P.*; Wada, Michiharu*; Arai, Fumiya*; Haba, Hiromitsu*; Hirayama, Yoshikazu*; Ishizawa, Satoshi*; Kaji, Daiya*; Kimura, Sota*; Koura, Hiroyuki; et al.
Physical Review Letters, 120(15), p.152501_1 - 152501_6, 2018/04
Times Cited Count：60 Percentile：93.36(Physics, Multidisciplinary)Masses of 
Es, 
Fm and the transfermium nuclei 
Md, and 
No, produced by hot- and cold-fusion reactions, in the vicinity of the deformed 
neutron shell closure, have been directly measured using a multi-reflection time-of-flight mass spectrograph. The masses of Es and 
Md were measured for the first time. Using the masses of 
Md as anchor points for 
decay chains, the masses of heavier nuclei, up to 
Bh and 
Mt, were determined. These new masses were compared with theoretical global mass models and demonstrated to be in good agreement with macroscopic-microscopic models in this region. The empirical shell gap parameter 
derived from three isotopic masses was updated with the new masses and corroborate the existence of the deformed neutron shell closure for Md and Lr.
Schury, P.*; Wada, Michiharu*; Ito, Yuta*; Kaji, Daiya*; Haba, Hiromitsu*; Hirayama, Yoshikazu*; Kimura, Sota*; Koura, Hiroyuki; MacCormick, M.*; Miyatake, Hiroari*; et al.
Nuclear Instruments and Methods in Physics Research B, 407, p.160 - 165, 2017/06
Times Cited Count：14 Percentile：78.05(Instruments & Instrumentation)Various isotopes of Ac, Ra, Fr, and Rn were produced by fusion-evaporation reactions using a 
Ca beam. The energetic ions were stopped in and extracted from a helium gas cell. The extracted ions were identified using a multi-reflection time-of-fight mass spectrograph. In all cases, it was observed that the predominant charge state for the extracted ions, including the alkali Fr, was 2+.
Schury, P.*; Wada, Michiharu*; Ito, Yuta*; Kaji, Daiya*; Arai, Fumiya*; MacCormick, M.*; Murray, I.*; Haba, Hiromitsu*; Jeong, S.*; Kimura, Sota*; et al.
Physical Review C, 95(1), p.011305_1 - 011305_6, 2017/01
Times Cited Count：48 Percentile：96.07(Physics, Nuclear)Using a multireflection time-of-flight mass spectrograph located after a gas cell coupled with the gas-filled recoil ion separator GARIS-II, the masses of several -decaying heavy nuclei were directly and precisely measured. The nuclei were produced via fusion-evaporation reactions and separated from projectilelike and targetlike particles using GARIS-II before being stopped in a helium-filled gas cell. Time-of-flight spectra for three isobar chains, 
Fr-Rn-At-Po, 
Fr- Rn-At-Po-Bi, and 
Fr-Rn-At, were observed. Precision atomic mass values were determined for 
Fr, 
Rn, and At. Identifications of Bi, Po, Rn, and At were made with N
10 detected ions, representing the next step toward use of mass spectrometry to identify exceedingly low-yield species such as superheavy element ions.
Schury, P. H.*; Wada, Michiharu*; Ito, Yuta*; Naimi, S.*; Sonoda, Tetsu*; Mita, Koki*; Takamine, Aiko*; Okada, Kunihiro*; Wollnik, H.*; Chon, S.*; et al.
Nuclear Instruments and Methods in Physics Research B, 317(Part B), p.537 - 543, 2013/12
Times Cited Count：28 Percentile：89.14(Instruments & Instrumentation)A multi-reflection time-of-flight (MRTOF) mass spectrograph has been implemented at RIKEN to provide high-precision mass measurements of very short-lived nuclei. Of particular interest are mass measurements of r-process nuclei and trans-uranium nuclei. In such nuclei, the MRTOF can perform on par with or better than traditional Penning trap systems. We demonstrate that the MRTOF-MS is capable of accurately attaining relative mass precision of 
m/m 
10
and describe it's utility with heavy, short-lived nuclei.
-chlorophenoxyisobutyric acid reveals that 
, a gene encoding a DCN1-like protein, regulates responses to the synthetic auxin 2,4-dichlorophenoxyacetic acid in Arabidopsis rootsBiswas, K. K.*; Oura, Chiharu*; Higuchi, Kanako*; Miyazaki, Yuji*; Nguyen, V. V.*; Rahman, A.*; Uchimiya, Hirofumi*; Kiyosue, Tomohiro*; Koshiba, Tomokazu*; Tanaka, Atsushi; et al.
Plant Physiology, 145(3), p.773 - 785, 2007/11
Times Cited Count：37 Percentile：66.14(Plant Sciences)We screened mutants for root growth resistance to a putative antiauxin, PCIB, which inhibits auxin action by interfering the upstream auxin signaling events. Eleven PCIB-resistant mutants were obtained. Genetic mapping indicates that the mutations are located in at least 5 independent loci including two known auxin-related loci, 
and 
. 
mutants (
s) 
, 
and 
were also resistant to 2,4-D as shown by a root growth assay. Positional cloning of revealed that the gene encodes a protein with a domain of unknown function (DUF298), which has not previously been implicated in auxin signaling. The protein has a putative nuclear localization signal and shares homology with the DCN-1 protein through the DUF298 domain. The results also indicate that PCIB can facilitate the identification of factors involved in auxin or auxin-related signaling.
Rahman, A.*; Nakasone, Akari*; Chhun, T.*; Oura, Chiharu*; Biswas, K. K.*; Uchimiya, Hirofumi*; Tsurumi, Seiji*; Baskin, T. I.*; Tanaka, Atsushi; Ono, Yutaka
Plant Journal, 47(5), p.788 - 801, 2006/09
Times Cited Count：33 Percentile：59.9(Plant Sciences)2,4-D, a chemical analogue of IAA, is widely used as a growth regulator and exogenous source of auxin. It is believed that they share a common response pathway. Here, we show that a mutant, 
(
) is resistant to 2,4-D, yet nevertheless responds like the wild type to IAA. That the mutation alters 2,4-D responsiveness specifically was confirmed by analysis of GUS expression in the
and 
backgrounds, as well as by real-time PCR quantification of 
expression. Complementation and RNAi experiments identified a gene that confers 2,4-D responsiveness. The gene encodes a 
with unknown function and present in plants, animals, and invertebrates. These results suggest that SMAP1 is a regulatory component that mediates responses to 2,4-D and that responsiveness to 2,4-D and IAA are partially distinct.
-chlorophenoxyisobutyric acid impairs auxin response in arabidopsis rootOno, Yutaka; Oura, Chiharu*; Rahman, A.; Aspuria, E. T.; Hayashi, Kenichiro*; Tanaka, Atsushi; Uchimiya, Hirofumi*
Plant Physiology, 133(3), p.1135 - 1147, 2003/11
Times Cited Count：132 Percentile：92.45(Plant Sciences)PCIB (-chlorophenoxyisobutyric acid) is known as a putative antiauxin and is widely used to inhibit auxin action, although the mechanism of PCIB-mediated inhibition of auxin action is not characterized very well at molecular level. In the present work, we showed that PCIB inhibited BA::GUS expression induced by IAA, 2,4-D and NAA. PCIB also inhibited auxin dependent DR5::GUS expression. RNA hybridization and quantitative RT-PCR analyses suggested that PCIB reduced auxin-induced accumulation of transcripts of 
genes. In addition, PCIB relieved the reduction of GUS activity in 
transgenic line in which auxin inhibits GUS activity by promoting degradation of the AXR3NT-GUS fusion protein. Physiological analysis revealed that PCIB inhibited lateral root production, gravitropic response of roots and growth of primary roots. These results suggest that PCIB impairs auxin signaling pathway by regulating Aux/IAA protein stability, and thereby affects the auxin-regulated Arabidopsis root physiology.
Aspuria, E. T.; Oura, Chiharu*; Chen, Q.*; Uchimiya, Hirofumi; Ono, Yutaka
Plant Cell Reports, 21(1), p.52 - 57, 2002/07
Times Cited Count：7 Percentile：17.54(Plant Sciences)no abstracts in English
Ono, Yutaka; Oura, Chiharu*; Uchimiya, Hirofumi
Annals of Botany, 89(1), p.77 - 82, 2002/01
Times Cited Count：10 Percentile：24.54(Plant Sciences)no abstracts in English
Oura, Chiharu*; Aspuria, E. T.; Ono, Yutaka; Hase, Yoshihiro; Kobayashi, Yasuhiko; Uchimiya, Hirofumi
JAERI-Review 2001-039, TIARA Annual Report 2000, p.67 - 69, 2001/11
no abstracts in English
genesLiu, J.; Oura, Chiharu*; Aspuria, E. T.; Ono, Yutaka; Uchimiya, Hirofumi
Chinese Science Bulletin, 46(19), p.1642 - 1645, 2001/10
Times Cited Count：1 Percentile：1.82(Multidisciplinary Sciences)no abstracts in English
