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Fukuoka-shi, Japan

Fukuoka International University is a private university in Dazaifu, Fukuoka, Japan, established in 1998. Wikipedia.

Itoh T.,Japan National Institute of Advanced Industrial Science and Technology | Hoshikawa Y.,Tohoku University | Matsuura S.-I.,Japan National Institute of Advanced Industrial Science and Technology | Mizuguchi J.,Japan National Institute of Advanced Industrial Science and Technology | And 6 more authors.
Biochemical Engineering Journal | Year: 2012

A new enzymatic process for production of l-theanine was presented using glutaminase combined with immobilization technique on carbon-coated mesoporous silica (carbon/SBA-15). For the attempt to enhance the durability against high pH conditions, the pore surface of mesoporous silica SBA-15 was coated with a thin layer of carbon. Carbon coating was done by addition of 2,3-dihydroxynaphthalene (DN) on the pore surface, followed by a dehydration reaction between surface silanol groups in SBA-15 and hydroxyl groups of DN molecules, and further carbonization of DN. A glutaminase was confined in nanospace (about 5. nm) of carbon/SBA-15. The resulting product, glutaminase/carbon/SBA-15, successfully catalyzed the reaction for production of l-theanine under high pH conditions. © 2012 Elsevier B.V. Source

Shikata N.,Kyushu University | Shikata N.,Ajinomoto Co. | Maki Y.,Fukuoka International University | Nakatsui M.,Kyushu University | And 6 more authors.
Amino Acids | Year: 2010

The changes in the concentrations of plasma amino acids do not always follow the flow-based metabolic pathway network. We have previously shown that there is a control-based network structure among plasma amino acids besides the metabolic pathway map. Based on this network structure, in this study, we performed dynamic analysis using time-course data of the plasma samples of rats fed single essential amino acid deficient diet. Using S-system model (conceptual mathematical model represented by power-law formalism), we inferred the dynamic network structure which reproduces the actual time-courses within the error allowance of 13.17%. By performing sensitivity analysis, three of the most dominant relations in this network were selected; the control paths from leucine to valine, from methionine to threonine, and from leucine to isoleucine. This result is in good agreement with the biological knowledge regarding branched-chain amino acids, and suggests the biological importance of the effect from methionine to threonine. © 2009 Springer-Verlag. Source

Matsunaga H.,Fukuoka International University | Sun C.,CAS Institute of Mechanics | Hong Y.,CAS Institute of Mechanics | Murakami Y.,Kyushu University
Fatigue and Fracture of Engineering Materials and Structures | Year: 2015

Dominant factors affecting fatigue failure from non-metallic inclusions in the very-high-cycle fatigue (VHCF) regime are reviewed, and the mechanism for the disappearance of the conventional fatigue limit is discussed. Specifically, this paper focuses on the following: (i) the crucial role of internal hydrogen trapped by non-metallic inclusions for the growth of the optically dark area (around the non-metallic inclusion at fracture origin), (ii) the behaviour of the crack growth from a non-metallic inclusion as a small crack and (iii) the statistical aspects of the VHCF strength, in consideration of the maximum inclusion size, using statistics of extremes. In addition, on the basis of the aforementioned findings, a new fatigue design method is proposed for the VHCF regime. The design method gives the allowable stress, σallowable, for a determined design life, NfD, as the lower bound of scatter of fatigue strength, which depends on the amount of components produced. © 2015 Wiley Publishing Ltd. Source

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