Mariko Ando
Tohoku University
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Publication
Featured researches published by Mariko Ando.
Journal of the American Chemical Society | 2009
Hideki Maekawa; Motoaki Matsuo; Hitoshi Takamura; Mariko Ando; Yasuto Noda; Taiki Karahashi; Shin-ichi Orimo
Solid state lithium conductors are attracting much attention for their potential applications to solid-state batteries and supercapacitors of high energy density to overcome safety issues and irreversible capacity loss of the currently commercialized ones. Recently, we discovered a new class of lithium super ionic conductors based on lithium borohydride (LiBH(4)). LiBH(4) was found to have conductivity as high as 10(-2) Scm(-1) accompanied by orthorhombic to hexagonal phase transition above 115 degrees C. Polarization to the lithium metal electrode was shown to be extremely low, providing a versatile anode interface for the battery application. However, the high transition temperature of the superionic phase has limited its applications. Here we show that a chemical modification of LiBH(4) can stabilize the superionic phase even below room temperature. By doping of lithium halides, high conductivity can be obtained at room temperature. Both XRD and NMR confirmed room-temperature stabilization of superionic phase for LiI-doped LiBH(4). The electrochemical measurements showed a great advantage of this material as an extremely lightweight lithium electrolyte for batteries of high energy density. This material will open alternative opportunities for the development of solid ionic conductors other than previously known lithium conductors.
Journal of Wood Science | 2011
Liming Bai; Ming Zhao; Asami Toki; Toshiaki Hasegawa; Jun-ichi Sakai; Xiao-yang Yang; Yuhua Bai; Hirotsugu Ogura; Tomokazu Mitsui; Takao Kataoka; Mariko Ando; Katsutoshi Hirose; Masayoshi Ando
Twelve polar cardenolide monoglycosides, 1, 2, 4–13, and oleagenin (3) were isolated from the methanol extract of stems and twigs of Nerium oleander. Among these, oleagenin (3) and cardenolide monoglycosides named cardenolide B-1 (1) and cardenolide B-2 (2) were isolated from natural sources for the first time. The in vitro antiinflammatory activity of compounds 1–13 was examined on the basis of inhibitory activity against the induction of the intercellular adhesion molecule-1 (ICAM-1). Compounds 4–7 were active at an IC50 value of less than 0.4 μM. The cytotoxic activity of compounds 1–13 was evaluated against three human cell lines: normal human fibroblast cells (WI-38), malignant tumor cells derived from WI-38 (VA-13), and human liver tumor cells (HepG2). Compounds 4, 6, and 7 were active toward these three cell lines at IC50 values of less than 0.7 μM, and compounds 5 and 8 were active toward the cell lines at IC50 values of less than 1.5 μM. The multidrug resistance (MDR) cancer-reversal activity of compounds 1–13 was evaluated on the basis of the amount of calcein accumulated in MDR human ovarian cancer 2780AD cells in the presence of each compound. Compound 1 and 12 showed significant effects on calcein accumulation.
Solid State Ionics | 2011
R. Miyazaki; Taiki Karahashi; N. Kumatani; Yasuto Noda; Mariko Ando; Hitoshi Takamura; Motoaki Matsuo; Shin-ichi Orimo; Hideki Maekawa
Solid State Ionics | 2012
Itaru Oikawa; Mariko Ando; Hajime Kiyono; Masataka Tansho; Tadashi Shimizu; Hideki Maekawa
Carbon | 2016
Yasuto Hoshikawa; Bai-Gang An; Susumu Kashihara; Takafumi Ishii; Mariko Ando; Syuji Fujisawa; Koutarou Hayakawa; Satoshi Hamatani; Hiroshi Yamada; Takashi Kyotani
Solid State Ionics | 2011
Itaru Oikawa; Mariko Ando; Yasuto Noda; Koji Amezawa; Hajime Kiyono; Tadashi Shimizu; Masataka Tansho; Hideki Maekawa
Chemical & Pharmaceutical Bulletin | 2010
Liming Bai; Ming Zhao; Asami Toki; Jun-ichi Sakai; Xiao-yang Yang; Yuhua Bai; Mariko Ando; Katsutoshi Hirose; Masayoshi Ando
Journal of Luminescence | 2015
Yoshinori Wakui; Kanako Takahashi; Yue Jin Shan; Keitaro Tezuka; Hideo Imoto; Shogo Hosokawa; Norifumi Shinozaki; Mariko Ando; Hideki Maekawa
Solid State Ionics | 2012
Hajime Kiyono; Yuuya Matsuda; Toshihiro Shimada; Mariko Ando; Itaru Oikawa; Hideki Maekawa; Susumu Nakayama; Shinobu Ohki; Masataka Tansho; Tadashi Shimizu; Pierre Florian; Dominuqie Massiot
Chemical & Pharmaceutical Bulletin | 2011
Ming Zhao; Liming Bai; Asami Toki; Ryo Hasegawa; Jun-ichi Sakai; Toshiaki Hasegawa; Hirotsugu Ogura; Takao Kataoka; Yuhua Bai; Mariko Ando; Katsutoshi Hirose; Masayoshi Ando