Papers by Author: Fukue Nagata

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Authors: Yoshiyuki Yokogawa, Yoshikazu Shiotsu, Fukue Nagata, Makoto Watanabe
Authors: Yoshiyuki Yokogawa, Kaori Nishizawa, Fukue Nagata, Atsushi Hozumi, Kay Teraoka, Masahiko Inagaki, Tetsuya Kameyama
Authors: Fukue Nagata, Kay Teraoka, Yoshiyuki Yokogawa, Tatsuya Miyajima
Authors: Ryouichi Hikosaka, Fukue Nagata, Masahiro Tomita, Katsuya Kato
Abstract: Deoxyribonucleic acid (DNA) adsorption onto particles has applications in biosensors, separation methods, and gene delivery. Mesoporous silica (MPS), which exhibits a high surface area and large pore volume, is used in these applications because its pore size is easily controlled and its surface functional groups are easily exchanged. In this study, three types of MPSs with different pore sizes (2.4, 5.6, and 11.8 nm) were functionalized with different aminosilane coupling reagents and the effects of the MPS pore size and surface functional groups on DNA adsorption were evaluated. As the pore size of MPS increased, MPSs with diethylenetriamine (–3NH2) adsorbed higher amounts of DNA, whereas MPSs with hexylenediamine groups (–2HNH2) adsorbed lower amounts of DNA. Moreover, the fitting of DNA adsorption equilibrium data to Langmuir and Freundlich isotherm models was investigated.
Authors: Tatsuya Miyajima, Fukue Nagata, W. Kanematsu, Yoshiyuki Yokogawa, Mototsugu Sakai
Authors: Jun Akiyama, Masami Hashimoto, Hiroaki Takadama, Fukue Nagata, Yoshiyuki Yokogawa, Kensuke Sassa, Kazuhiko Iwai, Shigeo Asai
Abstract: A high magnetic field is a useful tool to control the crystal alignment of non-magnetic materials such as ceramics and polymers. In the case of Hydroxyapatite crystal, the a,b-axis is aligned parallel to the direction of an imposed magnetic field. This fact implies that the alignment of the c-axis is not controllable only using a high static magnetic field due to the freedom of the c-axis in a plane perpendicular to a magnetic field direction. In this study, a high static magnetic field and mold rotation was simultaneously so applied during a slip casting process as to align the c-axis of HAp poly crystals.
Authors: Fukue Nagata, Tatsuya Miyajima, Yoshiyuki Yokogawa
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