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231.
232.
Masakazu Kawashita Naoko Matsui Zhixia Li Toshiki Miyazaki 《Journal of materials science. Materials in medicine》2010,21(6):1837-1843
Porous Y2O3 microparticles 500 μm in size were obtained, when 1 wt%-ammonium alginate aqueous solution was dropped into 0.5 M-YCl3 aqueous solution by a Pasteur pipette and the resultant gel microparticles were heat-treated at 1100°C. Small pores less than 1 μm were formed in the microparticles by the heat treatment. The bulk density of the heat-treated microparticle was as low as 0.66 g cm?3. The chemical durability of the heat-treated microparticles in simulated body fluid at pH = 6 and 7 was high enough for clinical application of in situ radiotherapy. Although the size of the microparticles should be decreased to around 25 μm using atomizing device such as spray gun for clinical application, we found that the porous Y2O3 microparticles with high chemical durability and low density can be obtained by utilizing gelation of ammonium alginate in YCl3 aqueous solution in this study. 相似文献
233.
Y. Edao S. Fukada Y. Nishimura K. Katayama T. Takeishi Y. Hatano A. Taguchi 《Fusion Engineering and Design》2012,87(7-8):995-998
The effects of hydrophobic paint coating on a concrete material of cement paste on the tritium transport are investigated. The cement paste is coated with two kinds of paints, acrylic-silicon resin paint and epoxy resin paint. We investigated the amount of tritium trapped in the samples exposed to tritiated water vapor by means of sorption and release. It was found that both the hydrophobic paints could reduce effectively tritium permeation during 50 days exposure of tritiated water vapor. The effect of tritium reduction of the epoxy paint was higher than that of silicon while the amount of tritium trapped in the epoxy paint was larger than that of silicon due to difference of the structure. Based on an analysis of a diffusion model, the rate-determining step of tritium migration through cement paste coated with the paints is diffusion through the paints respectively. It was found that tritium was easy to penetrate through silicon because there were many pores or voids in the silicon comparatively. In the case of tritium released from the epoxy paint, it is considered that tritium diffusion in epoxy is slow due to retardation by isotope exchange reaction to water included in epoxy paint. 相似文献
234.
Toshiki Ueno Takeru Nakaki Taisei Mukogawa Shuonan Dong Hiroki Kurita Keisuke Otsuka Kanjuro Makihara Fumio Narita 《Advanced Engineering Materials》2023,25(19):2300185
In this study, the Fe–Co alloy is combined with cobalt ferrite (CoFe2O4) and nickel (Ni) to form Fe–Co/CoFe2O4 and Fe–Co/Ni clad sheets and their energy-harvesting performance is evaluated. The Fe–Co/CoFe2O4 clad sheet exhibits an output voltage of 4.229 mV and an output power of 6.89 nW at a wind speed of 10 m s−1. The energy-harvesting performance of both these clad sheets cannot be quantitatively compared owing to their different thicknesses, which result in varying volume and distance from the neutral plane. Nevertheless, the values of output voltage and power for Fe–Co/CoFe2O4 are higher than those for Fe–Co/Ni (2.107 mV and 0.294 nW). 相似文献
235.
Koji Kadota Toshiki Mikami Dr. Ai Kohata Dr. Jumpei Morimoto Prof. Dr. Shinsuke Sando Dr. Kohsuke Aikawa Dr. Takashi Okazoe 《Chembiochem : a European journal of chemical biology》2023,24(21):e202300374
With an increasing demand for macromolecular biotherapeutics, the issue of their poor cell-penetrating abilities requires viable and relevant solutions. Herein, we report tripeptides bearing an amino acid with a perfluoroalkyl (RF) group adjacent to the α-carbon. RF-containing tripeptides were synthesized and evaluated for their ability to transport a conjugated hydrophilic dye (Alexa Fluor 647) into the cells. RF-containing tripeptides with the fluorophore showed high cellular uptake efficiency and none of them were cytotoxic. Interestingly, we demonstrated that the absolute configuration of perfluoroalkylated amino acids (RF-AAs) affects not only nanoparticle formation but also the cell permeability of the tripeptides. These novel RF-containing tripeptides are potentially useful as short and noncationic cell-penetrating peptides (CPPs). 相似文献