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Nakamura, Fumiaki,Maejima, Hiroshi,Kawamura, Midori,Arai, Daisuke,Okino, Tatsufumi,Zhao, Meng,Ye, Tao,Lee, Jungyeol,Chang, Young-Tae,Fusetani, Nobuhiro,Nakao, Yoichi Elsevier 2018 Bioorganic & medicinal chemistry letters Vol.28 No.12
<P><B>Abstract</B></P> <P>Kakeromamide A (<B>1</B>), a new cyclic pentapeptide encompassing a thiazole ring moiety and a <I>β</I>-amino acid, was isolated from the marine cyanobacterium <I>Moorea bouillonii</I>. Its structure was elucidated by the spectral analysis and the modified Marfey’s method. Compound <B>1</B> induced differentiation of neural stem cells into astrocytes at the concentration of 10 µM.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new cyclic pentapeptide isolated from the marine cyanobacterium. </LI> <LI> Moderately cytotoxic against HeLa cells. </LI> <LI> Induced differentiation of neural stem cells into astrocytes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Mechanism of Apatite Formation on Bioactive Titanium Metal
Kim, Hyun-Min,Takadama, Hiroaki,Miyaji, Fumiaki,Kokubo, Tadashi,Nishiguchi, Shigeru,Nakamura, Takashi The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.4
Bioactive titanium metal can be prepared by simple 5M-NaOH treatment and subsuquent heat treatment at $600^{\circ}C$ to form an amorphous sodium titanate on its surface. In the present study, mechanism of apatite formation on the titanium metal was investigated by examining its surface compositional and structural changes in a simulated body fluid. The apatite formation on the metal was found to proceed in the sequence of 1)$Na^+$ ion release from the sodium titanate to form hydrated titania abundant in Ti-OH groups, 2) early and selective binding of calcium ions with the Ti-OH groups to form a calcium titanate, and 3) late binding of phosphate ions to make apatite nucleation and growth. This indicates that Ti-OH groups do not directly induce the apatite nucleation, but via formation of a calcium titanate.
Flattening simulations of 3D thick sheets made of fiber composite materials
Morioka, Kotaro,Ohtake, Yutaka,Suzuki, Hiromasa,Nagai, Yukie,Hishida, Hiroyuki,Inagaki, Koichi,Nakamura, Takeshi,Watanabe, Fumiaki Society for Computational Design and Engineering 2015 Journal of computational design and engineering Vol.2 No.2
Recently, fiber composite materials have been attracting attention from industry because of their remarkable material characteristics, including light weight and high stiffness. However, the costs of products composed of fiber materials remain high because of the lack of effective manufacturing and designing technologies. To improve the relevant design technology, this paper proposes a novel simulation method for deforming fiber materials. Specifically, given a 3D model with constant thickness and known fiber orientation, the proposed method simulates the deformation of a model made of thick fiber-material. The method separates a 3D sheet model into two surfaces and then flattens these surfaces into two dimensional planes by a parameterization method with involves cross vector fields. The cross vector fields are generated by propagating the given fiber orientations specified at several important points on the 3D model. Integration of the cross vector fields gives parameterization with low-stretch and low-distortion.
New Corrosion-Resistant Zn-Al-Mg Alloy Hot-Dip Galvanized Steel Sheet
( Kohei Tokuda ),( Yasuto Goto ),( Mamoru Saito ),( Hiroshi Takebayashi ),( Takeshi Konishi ),( Yuto Fukuda ),( Fumiaki Nakamura ),( Koji Kawanishi ),( Kohei Ueda ),( Hidetoshi Shindo ) 한국부식방식학회 2024 Corrosion Science and Technology Vol.23 No.2
In recent years, Zn-Al-Mg alloy galvanized steel sheets have been widely used as coated steel sheets to support social capital in the infrastructure field. A feature of Zn-Al-Mg alloy-coated steel sheets is that they provide a better corrosion protection period than Zn-coated steel sheets. In this study, the corrosion resistance of a new Zn-Al-Mg alloy-coated steel sheet was investigated and compared to that of conventional commercially available coated steel sheets. The investigation confirmed that increasing the Mg concentration in the Zn-Al-Mg-coated steel sheet improved corrosion resistance, which was more than 10 times that of the galvanized steel sheet specified in JIS G 3302. The study findings also confirmed that the corrosion resistance reached more than twice that of the coated steel sheet specified in JIS G 3323. If such galvanized steel sheets are applied to social infrastructures that are exposed to severely corrosive environments, the service life of the infrastructure might be extended.