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Yoshikazu Matsui,Hiroshi Horikawab,Mitsunobu Iwasaki,박원규 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.3
Nanometre-sized yttrium aluminum garnet doped with Ce3+ (YAG : Ce) crystals were prepared at a low temperatures by use of an environmentally-friendly wet process, in which an alcohol-water mixture with metal salts is refluxed without any addition of surfactants or adsorbing ligands. All of the YAG : Ce particles with 0.1-10 mol% of Ce3+ ions were found to be nanocrystals. YAG : Ce nanocrystals emitted at a 532 nm wavelength with the excitation light at 454 nm. The highest quantum efficiency was achieved at a very small Ce3+ content of 0.3 mol %. The decay curve of the fluorescence consisted of the three exponential terms, and the average fluorescence lifetime was around 110 ns irrespective of the Ce3+ concentration.
Houtani, Hidetaka,Komoriyama, Yusuke,Matsui, Sadaoki,Oka, Masayoshi,Sawada, Hiroshi,Tanaka, Yoshiteru,Tanizawa, Katsuji Korean Society of Ocean Engineers 2018 Journal of advanced research in ocean engineering Vol.4 No.4
We herein propose a new design procedure of a flexible container ship model where the vertical bending and torsional vibration modes are similar to its prototype. To achieve similarity in torsional vibration mode shapes, the height of the shear center of the model must be located below the bottom hull, similar to an actual container ship with large opening decks. Therefore, we designed a ship model by imparting appropriate stiffness to the hull, using urethane foam without a backbone. We built a container ship model according to this design strategy and validated its dynamic elastic properties using a decay test. We measured wave-induced structural vibrations and present the results of tank experiments in regular and freak waves.
Role of Hydrogen Generation by Klebsiella pneumoniae in the Oral Cavity
Tomoko Kanazuru,Kumiko Nagata,Hiroshi Matsui,Kunihiko Watanabe,Eisuke F. Sato,Emiko Kasahara,Mika Jikumaru,June Inoue,Masayasu Inoue 한국미생물학회 2010 The journal of microbiology Vol.48 No.6
Some gastrointestinal bacteria synthesize hydrogen (H2) by fermentation. Despite the presence of bactericidal factors in human saliva, a large number of bacteria also live in the oral cavity. It has never been shown that oral bacteria also produce H2 or what role H2 might play in the oral cavity. It was found that a significant amount of H2 is synthesized in the oral cavity of healthy human subjects, and that its generation is enhanced by the presence of glucose but inhibited by either teeth brushing or sterilization with povidone iodine. These observations suggest the presence of H2-generating bacteria in the oral cavity. The screening of commensal bacteria in the oral cavity revealed that a variety of anaerobic bacteria generate H2. Among them,Klebsiella pneumoniae (K. pneumoniae) generated significantly large amounts of H2 in the presence of glucose. Biochemical analysis revealed that various proteins in K. pneumoniae are carbonylated under standard culture conditions, and that oxidative stress induced by the presence of Fe++ and H2O2 increases the number of carbonylated proteins, particularly when their hydrogenase activity is inhibited by KCN. Inhibition of H2generation markedly suppresses the growth of K. pneumoniae. These observations suggest that H2 generation and/or the reduction of oxidative stress is important for the survival and growth of K. pneumoniae in the oral cavity.
Risk factors for severity of colonic diverticular hemorrhage
Ken Kinjo,Toshiyuki Matsui,Takashi Hisabe,Hiroshi Ishihara,Toshiki Kojima,Kenta Chuman,Shigeyoshi Yasukawa,Tsuyoshi Beppu,Akihiro Koga,Satoshi Ishikawa,Masahiro Kishi,Noritaka Takatsu,Fumihito Hirai,K 대한장연구학회 2018 Intestinal Research Vol.16 No.3
Background/Aims: Colonic diverticular hemorrhage (DH) was a rare disease until the 1990s, and its incidence has increased rapidly since 2000 in Japan. In recent years, colonic DH has been the most frequent cause of lower gastrointestinal bleeding (LGIB). Nearly all cases of DH are mild, with the bleeding often stopping spontaneously. Some cases, however, require surgery or arterial embolization. In this study, using a cohort at Fukuoka University Chikushi Hospital, we investigated factors associated with severe colonic DH. Methods: Among patients with LGIB who underwent colonoscopy at our hospital between 1995 and 2013, DH was identified in 273 patients. Among them, 62 patients (22.7%) were defined as having severe colonic DH according to recurrence of bleeding in a short period, and/or the necessity of transfusion, arterial embolization, or surgery. We then evaluated risk factors for severe DH among DH patients in this retrospective cohort. Results: Among the 273 patients with DH, use of non-steroidal anti-inflammatory drugs (NSAIDs) (odds ratio [OR], 2.801; 95% confidence interval [CI], 1.164–6.742), Charlson Risk Index (CRI) ≥2 (OR, 3.336; 95% CI, 1.154–7.353), right-sided colonic DH (OR, 3.873; 95% CI, 1.554–9.653), and symptoms of cerebral hypoperfusion (such as light-headedness, dizziness, or syncope) (OR, 2.926; 95% CI, 1.310–6.535) showed an increased risk of severe DH even after controlling for other factors. Conclusions: Severe DH occurred in 23% of DH patients, and NSAID use, CRI ≥2, right-sided colonic DH, and symptoms of cerebral hypoperfusion are suggested to be predictors of severe DH.
Toyao, Takashi,Ueno, Nana,Miyahara, Kenta,Matsui, Yasunori,Kim, Tae-Ho,Horiuchi, Yu,Ikeda, Hiroshi,Matsuoka, Masaya The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.89
<P>A Zr-based metal-organic framework with tetrakis(carboxyphenyl)porphyrin groups (Zr-MOF-TCPP: MOF-525) has been utilized as a photoredox catalyst to promote oxidative hydroxylation of arylboronic acids under green LED light irradiation. Zr-MOF-TCPP displays a superior catalytic activity for this process over the corresponding homogeneous catalyst (H4TCPP).</P>
Ohta, Eisuke,Kobayashi, Hitoshi,Sakai, Atsushi,Matsui, Yasunori,Sato, Hiroyasu,Ikeda, Hiroshi Korean Society of Photoscience 2015 Rapid communication in photoscience Vol.4 No.2
Fluorescence (FL) properties of a novel donor-acceptor dyad, comprised of mesitylene and 1,4-dicyano-2-methylnaphthalene (DCMN) subunits connected by an ether linkage, were elucidated. The dyad in cyclohexane exhibits FL arising from an intramolecular exciplex. In the crystalline state, the dyad does not emit light from intra- and inter-molecular exciplexes but rather displays FL that is nearly equivalent to that of 2-methoxymethyl-substituted DCMN. However, the emission spectrum of the crystalline dyad contains a shoulder in the long wavelength region, suggesting that weak intercolumnar charge-transfer interactions take place between columns consisting of the mesitylene and DCMN subunits.
Effect of alendronate on muscle mass: Investigation in patients with osteoporosis
Atsushi Harada,Sadayuki Ito,Yasumoto Matsui,Yoshihito Sakai,Marie Takemura,Haruhiko Tokuda,Tetsuro Hida,Hiroshi Shimokata 대한골다공증학회 2015 Osteoporosis and Sarcopenia Vol.1 No.1
Objectives: Many osteoporosis drugs reliably increase bone mass in the elderly; if these drugs also had a positive effect on muscle, their benefit would be even greater. We examined the effect of alendronate monotherapy on muscle mass in patients with osteoporosis. Methods: In this retrospective cohort, case-control study, patients from an osteoporosis database were divided into 2 groups: alendronate-treated patients (group A; n ¼ 199) and a control group receiving no drug treatment (group C; n ¼ 233). Appendicular skeletal muscle mass (ASM) and skeletal muscle mass index (SMI) measured by dual-energy X-ray absorptiometry were assessed at approximately 1 year. The change in muscle mass was compared between the groups. Results: At baseline, group A included more women and had lower height, weight, bone mineral content, and muscle mass than group C. A comparison of changes after 1 yeardadjusted for age, sex, observation period, body mass index and initial valuesdrevealed that the muscle mass in group A showed increases by 0.137 kg/m2 in SMI, 514 g in ASM, and 319 g in lower limb muscle mass (LLM). Group C showed no changes in muscle mass. A significant difference in the amount of change in ASM and LLM was found between the groups after adjustment: 2.5 times and 4.4 times higher, respectively, in groups A and C. However, the difference in SMI disappeared after adjustment. Conclusions: This is the first study to show that alendronate may have a positive effect not only on bone, but on muscle as well.
Banerjee, Ipsita A,Muniz, Germaine,Lee, Sang-Yup,Matsui, Hiroshi American Scientific Publishers 2007 Journal of Nanoscience and Nanotechnology Vol.7 No.7
<P>While various mineralizing peptides have been applied to grow metal nanoparticles on bionanotube templates, the semiconductor nanoparticle growth on nanotubes has not extensively been explored yet. In this paper, various semiconductor nanocrystals were grown on the bionanotubes surfaces with controlled sizes. When three synthetic peptides, which recognize and selectively bind Ge, Ti, and Cu ions, respectively, were incorporated on template bionanotube surfaces, highly crystalline and monodisperse Ge, TiO2, and Cu2S nanocrystals were grown on the tube surfaces. The sizes of these nanocrystals could be tuned as a function of pH, and larger semiconductor nanocrystals were grown as the pH of growth solutions was increased. All of these nanocrystals from smaller sizes to larger sizes had the same crystallinity. This peptide-controlled nanocrystal growth technique will be very useful to prepare semiconductor nanowires as building blocks for future microelectronics, whose band gaps can be tuned by the sizes of coated semiconductor nanoparticles via their quantum confinement effect. The novelty of this approach in the electronic device fabrication is that the semiconductor nanocrystal size control can be achieved by controlling peptide configurations via pH change, and this control may tune electronic structures and band gaps of the resulting semiconductor nanowires.</P>