OHARA Keishi

J-GLOBAL         Last updated: Jul 22, 2019 at 16:43
 
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Name
OHARA Keishi
Affiliation
Ehime University
Section
Graduate School of Science and Engineering Chemistry and Biology
Job title
Professor
Degree
Doctor of Science(Kyoto University)

Research Areas

 
 

Academic & Professional Experience

 
May 2015
 - 
Today
Professor, Graduate School of Science and Engineering, Ehime University
 
Apr 2007
 - 
Apr 2015
Associate Professor, Graduate School of Science and Engineering, Ehime University
 
Apr 2006
 - 
Mar 2007
Senior Assistant Professor, Graduate School of Science and Engineering, Ehime University
 
Apr 1996
 - 
Mar 2006
Assistant Professor, Faculty of Science, Ehime University
 
Jan 1996
 - 
Apr 1996
Researcher (JSPS Research Fellowships for Young Scientists), Graduate School of Science, Kyoto University
 

Education

 
Apr 1993
 - 
Mar 1996
Department of Chemistry, Graduate School of Science, Kyoto University
 
Apr 1987
 - 
Mar 1989
Inorganic and Physical Chemistry, Graduate School of Science, Osaka University
 
Apr 1983
 - 
Mar 1987
Department of Chemistry, Faculty of Science, Osaka University
 

Committee Memberships

 
Apr 2004
 - 
Today
Spectroscopical Society of Japan  Organizer of Ehime Block
 

Published Papers

 
Oki Kosuke, Takase Masayoshi, Mori Shigeki, Shiotari Akitoshi, Sugimoto Yoshiaki, Ohara Keishi, Okujima Tetsuo, Uno Hidemitsu
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   140(33) 10430-10434   Aug 2018   [Refereed]
Nagaoka Shin-ichi, Bandoh Yuki, Nagashima Umpei, Ohara Keishi
JOURNAL OF PHYSICAL CHEMISTRY A   121(42) 8069-8079   Oct 2017   [Refereed]
Yamamoto Ryoma, Yamamoto Takashi, Ohara Keishi, Naito Toshio
MAGNETOCHEMISTRY   3(2)    Jun 2017   [Refereed]
Noma Hiroki, Ohara Keishi, Naito Toshio
INORGANICS   4(2)    Jun 2016   [Refereed]
Okujima T, Ando C, Agrawal S, Matsumoto H, Mori S, Ohara K, Hisaki I, Nakae T, Takase M, Uno H, Kobayashi N
Journal of the American Chemical Society   138(24) 7540-7543   Jun 2016   [Refereed]
Shin Ichi Nagaoka, Hikaru Endo, Keishi Ohara, Umpei Nagashima
Journal of Physical Chemistry B   119(6) 2525-2532   Feb 2015   [Refereed]
© 2014 American Chemical Society. Excited-state intramolecular proton-transfer (ESIPT) and singlet-oxygen (1O2) quenching activities of intramolecularly hydrogen-bonded 1-(acylamino)anthraquinones have been studied by means of static and laser spe...
Yoshimi Sueishi, Masashi Hori, Misa Ishikawa, Keiko Matsu-ura, Erisa Kamogawa, Yusaku Honda, Masakazu Kita, Keishi Ohara
Journal of Clinical Biochemistry and Nutrition   54(2) 67-74   Mar 2014   [Refereed]
Scavenging rate constants of eight hydrophilic antioxidants, including caffeic acid, chlorogenic acid, genistein, glutathione, N-acetylcysteine, rutin, trolox, and uric acid against multiple ROS, namely superoxide anion, hydroxyl radical, singlet ...
Tomoko Saiki, Shigeki Mori, Keishi Ohara, Toshio Naito
Chemistry Letters   43 1119-1121   Jan 2014   [Refereed]
β-DiCC[Ni(dmit)2] (dmit: 1,3-dithiole-2-thione-4,5- dithiolato and DiCC: 3,3'-dihexyloxacarbocyanine) is a chargetransfer salt with redox activity. When voltages are applied, it brings about a reversible, hysteretic, solid-state-electrolytic react...
Hiroki Noma, Keishi Ohara, Toshio Naito
Chemistry Letters   43 1230-1232   Jan 2014   [Refereed]
© 2014 The Chemical Society of Japan. [Cu(dmit)2]2-formally consists of a magnetic Cu2+ion (S = 1/2) and closed-shell π-conjugated dmit2-ligands. However, it has been determined by electron spin resonance and molecular orbital calculations that th...
Toshio Naito, Tomoaki Karasudani, Naoki Nagayama, Keishi Ohara, Kensuke Konishi, Shigeki Mori, Takahiro Takano, Yukihiro Takahashi, Tamotsu Inabe, Shota Kinose, Sadafumi Nishihara, Katsuya Inoue
European Journal of Inorganic Chemistry   4000-4009   Jan 2014   [Refereed]
The simple molecular salt NMQ[Ni(dmit)2] (NMQ = N-methylquinolinium, dmit = 1,3-dithiol-2-thione-4,5-dithiolate) functions as a diamagnetic insulator with an activation energy Ea(dark) of 0.20 eV. However, at 300 K, it exhibits ca. 40 times higher...

Misc

 
髙橋 亮治, 小原 敬士, 松浦 真也
大学教育実践ジャーナル = Journal of faculty and staff development in higher education   (15) 141-146   Mar 2017   [Refereed]
野間博貴, 小原敬士, 山本貴, 内藤俊雄
日本化学会中国四国支部大会講演要旨集   2015 90   Nov 2015
小原敬士, 北平有望, 長岡伸一
日本化学会中国四国支部大会講演要旨集   2015 146   Nov 2015
長岡伸一, 小原敬士
Fragr J   43(6) 67-72   Jun 2015
長岡 伸一, 小原 敬士
Fragrance journal = フレグランスジャーナル   43(6) 67-72   Jun 2015

Books etc

 
Kinetic Study of Vitamin E Regeneration Reaction with Catechins (EC, EGC, ECG, and EGCG) in Homogeneous and Micellar Solution
Kazuo Mukai, Shuji Mitani, Souichi Nagai, Keishi Ohara (Part:Contributor, Proceedings of the 3rd China-Japan International Conference on Vitamins', Guilin, China, 2004)
2004   
CIDEP studies of photochemical reactions at different microwave frequencies, ST0M and ST-M.
Keishi Ohara, Noboru Hirota (Part:Contributor, Modern Applications of EPR/ESR: From Biophysics to Materials Science, Proceedings of the Asia-Pacific EPR/ESR Symposium, 1st, Kowloon, Hong Kong, Jan. 20-24, 1997, p114-122)
Springer-Verlag, Singapore   1998   

Research Grants & Projects

 
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2010 - 2013    Investigator(s): Keishi OHARA
In order to evaluate antioxidant activities of trace amount of natural materials, a method of measuring lifetimes of singlet oxygen near-infrared luminescence using a fiber-spot probe (0.4 mm) was developed. Time-evolutions of singlet oxygen lumin...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2007 - 2008    Investigator(s): Keishi OHARA
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(特定領域研究)
Project Year: 2003 - 2006    Investigator(s): Kazuo MUKAI
Human aging is induced by the reaction of lipid, protein, and nucleic acid with active oxygens and free radicals. Natural antioxidants such as vitamin E (α-, β-, γ-, δ-tocopherol, TocH), ubiquinol, vitamin C, polyphenols (flavones, catechins) etc....
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: Apr 2004 - 2005    Investigator(s): Keishi OHARA
In the present study, a kinetic investigation was progressed on the antioxidant reactions versus reactive oxygen species for natural antioxidants, such as vitamin E and catechins, in the emulsion phase by using time-resolved methods based on the f...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2007 - 2008    Investigator(s): Shin-ichi NAGAOKA
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2003 - 2004    Investigator(s): Kazuo MUKAI
The development of organic ferromagnet and superconductor has attracted much attention in the field of material science, and many studies have been performed with great success in recent years. On the other hand, the examples of magnetic supercond...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 1999 - 2000    Investigator(s): Kazuo MUKAI
In the present work, we measured the rate constants of the reaction of peroxyl, tocopheroxyl, and aroxyl free radicals with natural antioxidants, such as catechins, caffeic acids and related compounds in homogeneous and micellar solutions, by usin...
Ministry of Education, Culture, Sports, Science and Technology: Grant-in-Aid for Young Scientists (A)
Project Year: 1999 - 2000    Investigator(s): Keishi OHARA
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 1997 - 1998    Investigator(s): Shin-ichi NAGAOKA
Proton transfer is a very simple chemical process readily accessible to both accurate measurement and quantitative theoretical analysis. We have constructed a simple theoretical model of the excited-state-proton-transfer, a model based on the noda...