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Akihisa Otaka,Yasuhiko Iwasaki 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-
Phosphorus-containing polymers are taking a growing interest as a bio-applicable material. Anionic poly(phosphodiester) is one type of phosphorus-containing polymer and has a similar backbone structure toteichoic acid (TA), which makes up the cell walls of gram-positive bacteria. In this study, we synthesized acopolymer of ethylene sodium phosphate and butynyl phosphate (P(EP Na/BYP)), which mimics TA and,thus, should be taken up by macrophages by the same mechanism as bacterial cells. In-vitro studiesshowed that RAW 264.7 mammalian macrophages exhibited higher uptake of P(EP Na/BYP) than L929mammalianfibroblasts. Further, the uptake of P(EP Na/BYP) by macrophages decreased in the presence ofdextran sulfate; this implies that the scavenger receptor contributes to endocytosis of P(EP Na/BYP). Invitrostudies on P(EP Na/BYP) with different lengths (38, 85, and 127 phosphate residues) showed that P(EP Na/BYP) with 127 phosphate residues led to the highest intracellular transportation and the leastgene expressions of IL-6 and TNF-α. These results demonstrate that water-soluble poly(phosphodiester)can be used as a modifier to deliver medical drugs to macrophages.
Development of Simulator of Allophone of Motors for Automobiles
Ryo Kano,Hiroyasu Ohtake,Yoshifumi Morita,Makoto Iwasaki,Hiroyuki Ukai,Yasuhiko Mukai,Hideki Kabune,Norihisa Ito 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Recently reduction of allophone of motors for automobiles has received a great deal of attention. For this background, the final goal of our research is to develop a simulator for transfer characteristics of allophone of motors in automobiles. In this paper at the preparation phase for the development of a simulator, we investigated the applicability of the transfer function synthesis method (TFSM) experimentally. Additionally, we examined some problems to be solved for practical use of the TFSM by using the finite element method (FEM). As a result, it was found that the derivation of the transfer functions H22 and H33 at the connecting point was difficult and that the modeling accuracy of H22 and H33 had a large influence on the modeling accuracy of the total transfer function H41_sim. Moreover, the method to improve the modeling accuracy was proposed on the basis of the results by FEM analysis. It was confirmed that we could apply the TFSM to the simple test body with the contact area by using the proposed method and the adjustment for damping coefficient of the transfer function obtained by the curve fitting technique (CFT).