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Synthesis and photoluminescence properties of HEu(MoO4)2 nanophosphor
Mizuki Watanabe,Kazuyoshi Uematsu,김선욱,Kenji Toda,Mineo Sato 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.3
The HEu(MoO4)2 nanophosphor was synthesized for the first time by the H+ -exchange of KEu(MoO4)2. The nanophosphor obtained in the present study maintain the triclinic KEu(MoO4)2 type structure in a single phase form with high crystallinity. The HEu(MoO4)2 phosphor has rod-like particle morphology (length 0.5-20 µm, diameter 50-400 nm). Both HEu(MoO4)2 powder and solution shows red emission due to the 4f-4f transition of Eu3+.
Synthesis of Li<sub>2</sub>SiO<sub>3</sub> using novel water-assisted solid state reaction method
WATANABE, Mizuki,INOI, Jun,KIM, Sun Woog,KANEKO, Tatsuro,TODA, Ayano,SATO, Mineo,UEMATSU, Kazuyoshi,TODA, Kenji,KOIDE, Junko,TODA, Masako,KAWAKAMI, Emiko,KUDO, Yoshiaki,MASAKI, Takaki,YOON, Dae Ho Ceramic Society of Japan 2017 JOURNAL OF THE CERAMIC SOCIETY OF JAPAN - Vol.125 No.6
<P>Single phase of orthorhombic Li2SiO3 was synthesized via a novel soft-chemical synthesis method, water assisted solid state reaction method at 343-353K for 60 min. The crystal structure of the samples was characterized by X-ray diffraction (XRD) analysis. The scanning electron microscope (SEM) observation revealed that the estimated size of the particles is 50-200 nm. The XRD patterns and SEM images were compared to those of samples by a conventional solid state method at 1173K for 4 h. (C) 2017 The Ceramic Society of Japan. All rights reserved.</P>
Hirohisa Watanabe,Yuichi Riku,Kazuhiro Hara,Kazuya Kawabata,Tomohiko Nakamura,Mizuki Ito,Masaaki Hirayama,Mari Yoshida,Masahisa Katsuno,Gen Sobue 대한파킨슨병및이상운동질환학회 2018 Journal Of Movement Disorders Vol.11 No.3
Multiple system atrophy (MSA) is an adult-onset, progressive neurodegenerative disorder. Patients with MSA show various phenotypes during the course of their illness, including parkinsonism, cerebellar ataxia, autonomic failure, and pyramidal signs. Patients with MSA sometimes present with isolated autonomic failure or motor symptoms/ signs. The median duration from onset to the concomitant appearance of motor and autonomic symptoms is approximately 2 years but can range up to 14 years. As the presence of both motor and autonomic symptoms is essential for the current diagnostic criteria, early diagnosis is difficult when patients present with isolated autonomic failure or motor symptoms/signs. In contrast, patients with MSA may show severe autonomic failure and die before the presentation of motor symptoms/signs, which are currently required for the diagnosis of MSA. Recent studies have also revealed that patients with MSA may show nonsupporting features of MSA such as dementia, hallucinations, and vertical gaze palsy. To establish early diagnostic criteria and clinically definitive categorization for the successful development of disease-modifying therapy or symptomatic interventions for MSA, research should focus on the isolated phase and atypical symptoms to develop specific clinical, imaging, and fluid biomarkers that satisfy the requirements for objectivity, for semi- or quantitative measurements, and for uncomplicated, worldwide availability. Several novel techniques, such as automated compartmentalization of the brain into multiple parcels for the quantification of gray and white matter volumes on an individual basis and the visualization of α-synuclein and other candidate serum and cerebrospinal fluid biomarkers, may be promising for the early and clinically definitive diagnosis of MSA.
Resistance Switching in View of Electron Hole Dynamics in Ferroelectric Related Oxides
Yukio Watanabe,Daisuke Matusmoto,Mizuki Yamato,Shigeru Kaku 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
An examination of typical switching experiments shows that the performances of the resistance switching in transition-metal oxides vary widely and depend on the details of each experiment. Conventional defect mechanisms, such as oxygen vacancies, work in some experiments. However, by comparing the macroscopic and the nanometer-scale characteristics and switching, we show here that other experiments indicate the possible existence of a more intrinsic physically new mechanism.VISITOR=Gzm-G
( Mahmoud Kandeel ),( Mizuki Yamamoto ),( Abdulla Al-taher ),( Aya Watanabe ),( Kentaro Oh-hashi ),( Byoung Kwon Park ),( Hyung-joo Kwon ),( Jun-ichiro Inoue ),( Mohammed Al-nazawi ) 한국응용약물학회 2020 Biomolecules & Therapeutics(구 응용약물학회지) Vol.28 No.4
Middle East Respiratory Syndrome Coronavirus (MERS-CoV) is a newly emerging viral disease with fatal outcomes. However, no MERS-CoV-specific treatment is commercially available. Given the absence of previous structure-based drug discovery studies targeting MERS-CoV fusion proteins, this set of compounds is considered the first generation of MERS-CoV small molecule fusion inhibitors. After a virtual screening campaign of 1.56 million compounds followed by cell-cell fusion assay and MERS-CoV plaques inhibition assay, three new compounds were identified. Compound numbers 22, 73, and 74 showed IC<sub>50</sub> values of 12.6, 21.8, and 11.12 μM, respectively, and were most effective at the onset of spike-receptor interactions. The compounds exhibited safe profiles against Human embryonic kidney cells 293 at a concentration of 20 μM with no observed toxicity in Vero cells at 10 μM. The experimental results are accompanied with predicted favorable pharmacokinetic descriptors and drug-likeness parameters. In conclusion, this study provides the first generation of MERS-CoV fusion inhibitors with potencies in the low micromolar range.
Kim, Sun Woog,Toda, Kenji,Hasegawa, Takuya,Watanabe, Mizuki,Kaneko, Tatsuro,Toda, Ayano,Itadani, Atsushi,Sato, Mineo,Uematsu, Kazuyoshi,Ishigaki, Tadashi,Koide, Junko,Toda, Masako,Kudo, Yoshiaki,Masak American Scientific Publishers 2018 Science of advanced materials Vol.10 No.4
<P>Lithium orthophosphate Li3PO4 nanoparticles were synthesized through a water assisted solid state reaction (WASSR) method. The nanoparticles obtained in this study adopt a stable orthorhombic structure (beta-type), which is a low temperature phase, in a single phase with high crystallinity. The Li3PO4 nanoparticles have a granular particle morphology and the particle size is less than 50 nm.</P>
Novel Soft Chemical Synthesis Methods of Ceramic Materials
Toda, Kenji,Kim, Sun Woog,Hasegawa, Takuya,Watanabe, Mizuki,Kaneko, Tatsuro,Toda, Ayano,Itadani, Atsushi,Sato, Mineo,Uematsu, Kazuyoshi,Ishigaki, Tadashi,Koide, Junko,Toda, Masako,Kudo, Yoshiaki,Masak Trans Tech Publications, Ltd. 2016 Key Engineering Materials Vol.690 No.-
<P>We report novel soft chemical synthesis method, solid hydratethermal reaction (SHR) method as a new soft chemistry. This method is very simple and can synthesize the ceramic materials just by storing the mixture of raw materials added a small amount of water in a reactor at low temperature below 373 K. For example, nanosize YVO4 (under 100 nm in diameter) was obtained using the SHR method.</P>
Sanuki, Takuro,Mishima, Gaku,Kurata, Shinji,Watanabe, Toshihiro,Kiriishi, Kensuke,Tachi, Mizuki,Ozaki, Yu,Okayasu, Ichiro,Kawai, Mari,Matsushita, Yuki,Miura, Keiichiro,Ayuse, Takao The Korean Dental Society of Anesthsiology 2015 Journal of Dental Anesthesia and Pain Medicine Vol.15 No.3
Background: We hypothesized that ketamine, when administered as the anesthetic induction agent, may prevent cardiovascular depression during high-dose remifentanil administration, unlike propofol. To test our hypothesis, we retrospectively compared the hemodynamic effects of ketamine, during high-dose remifentanil administration, with those of propofol. Methods: Thirty-eight patients who underwent oral surgery at the Nagasaki University Hospital between April 2014 and June 2015 were included in this study. Anesthesia was induced by the following procedure: First, high-dose remifentanil ($0.3-0.5{\mu}g/kg/min$) was administered 2-3 min before anesthesia induction;next, the anesthetic induction agent, either propofol (Group P) or ketamine (Group K), was administered. Mean arterial pressure (MAP) and the heart rate were recorded by the automated anesthesia recording system at four time points: immediately before the administration of high-dose remifentanil (T1);immediately before the administration of propofol or ketamine (T2);2.5 min (T3), and 5 min (T4) after the administration of the anesthetic induction agent. Results: In Group P, the MAP at T3 ($75.7{\pm}15.5mmHg$, P = 0.0015) and T4 ($68.3{\pm}12.5mmHg$, P < 0.001) were significantly lower than those at T1 ($94.0{\pm}12.4mmHg$). However, the MAP values in the K group were very similar (P = 0.133) at all time points. The heart rates in both Groups P (P = 0.254) and K (P = 0.859) remained unchanged over time. Conclusions: We showed that ketamine, when administered as the anesthetic induction agent during high-dose remifentanil administration, prevents cardiovascular depression.
Development of Water Assisted Solid State Reaction for the Ceramic Materials
Toda, Kenji,Kim, Sun Woog,Hasegawa, Takuya,Watanabe, Mizuki,Kaneko, Tatsuro,Toda, Ayano,Yamanashi, Ryota,Kumagai, Shota,Muto, Masaru,Itadani, Atsushi,Sato, Mineo,Uematsu, Kazuyoshi,Ishigaki, Tadashi,K Trans Tech Publications, Ltd. 2017 Key Engineering Materials Vol.751 No.-
<P>We report a novel soft chemical synthesis method, water assisted solid state reaction (WASSR) method. This method is very simple and can synthesize many ceramic materials just by storing or mixing raw materials added a small amount of water in a reactor at low temperature below 373 K. For example, well-crystalline SrMoO4 was obtained using the WASSR method.</P>