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648 results on '"Tsuru, Kanji"'

226. Fabrication of interconnected pore forming α-tricalcium phosphate foam granules cement.

Author

Shariff, Khairul Anuar, Tsuru, Kanji, and Ishikawa, Kunio

Subjects
*CALCIUM phosphate, *PHOSPHORIC acid, *PRECIPITATION (Chemistry), *TISSUE engineering, *CRYSTAL structure
Abstract

Interconnected pore forming calcium phosphate cement is useful for the reconstruction of bone defects as well as scaffold fabrication in tissue engineering. In this study, interconnected pore forming calcium phosphate cement was fabricated using α-tricalcium phosphate (α-TCP) foam granules. When α-TCP foam granules were mixed with acidic calcium phosphate solution prepared from monocalcium phosphate monohydrate (MCPM) and phosphoric acid solution, brushite crystals were precipitated. These crystals bridged the α-TCP foam granules immediately upon mixing. As a result of the brushite bridge between the α-TCP foam granules, fully interconnected macroporous α-TCP was obtained. The amount of brushite precipitate and the mechanical strength of the set cement increased with acidic calcium phosphate concentration. [ABSTRACT FROM AUTHOR]

Published
2016
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229. Effect of calcium-ozone treatment on chemical and biological properties of polyethylene terephthalate.

Author

Rashid, Ahmed Nafis, Tsuru, Kanji, and Ishikawa, Kunio

Abstract

Ozone (O3) treatment of polyethylene terephthalate (PET) in distilled water was performed in the presence and absence of calcium (Ca2+). PET was oxidized and thus carboxylic and hydroxyl functional groups were introduced on its surface after O3 treatment, regardless of the presence or absence of Ca2+. In the case of O3 treatment with Ca2+, PET surface was modified with Ca2+. Ca2+ immobilization was confirmed by X-ray photoelectron spectrometric analysis. Hydrophilicity was investigated by measuring contact angles (CA). CA of PET decreased significantly after ozonation. Surface topography of PET before and after ozone treatment was observed by scanning electron microscopy, and showed no morphological changes. In vitro studies showed enhanced rat bone marrow cell responses on the O3-treated PET surface. Ca2+-O3 oxidation at 37°C for 6 h is expected to be an effective method to fabricate PET with good biocompatibility. © 2014 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 103B: 853-860, 2015. [ABSTRACT FROM AUTHOR]

Published
2015
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