Search results for: Akiko Nomura

Items from 1 to 20 out of 30 results

article

Superoxide Dismutase‐like Activity of Zeolitic Imidazolate Framework Nanoparticles Comprising Biomimetic Imidazolato‐bridged CuZn Units

Hiroki Nakahara, Akiko Nomura, Shun Tokuda, Mami Okamura, more

Chemistry – A European Journal > 29 > 38 > n/a - n/a

Nanoparticles exhibiting enzymatic functions have garnered considerable attention due to their structural robustness and the profusion of active sites that can be introduced to a single nanosized particle. Here we report that nanosized mixed‐metal zeolitic imidazolate frameworks (ZIFs) show a superoxide dismutase (SOD)‐like catalytic activity. We chose a ZIF composed of copper and zinc ions and 2‐methylimidazole,...

article

XPS spectra of chromium monosilicides and disilicides obtained by in situ fractured clean surfaces

Naofumi Ohtsu, Masaoki Oku, Akiko Nomura, Kazuaki Wagatsuma

Surface and Interface Analysis > 52 > 12 > 1050 - 1054

X‐ray photoelectron spectroscopy spectra of chromium monosilicide (CrSi) and disilicide (CrSi₂) were collected from a clean surface prepared by fracturing the bulk silicide compound in a spectrometer under ultrahigh vacuum; the analytical procedure for the phase identification of the Cr–Si system was examined. A negligible binding energy shift was observed in the Cr 2p_3/2 level between elemental Cr...

article

Alarming Situation of Spreading Enteric Viruses Through Sewage Water in Dhaka City: Molecular Epidemiological Evidences

Sheikh Ariful Hoque, Aksara Thongprachum, Sayaka Takanashi, Salwa Mohd Mostafa, more

Food and Environmental Virology > 2019 > 11 > 1 > 65-75

Global burden of acute viral gastroenteritis remains high, particularly in developing countries including Bangladesh. Sewage water (SW) is an important node to monitor enteric pathogens both in the environment and among the population. Analysis of SW in Dhaka city deems crucially important because a large number of urban-city dwellers live in Dhaka city, the capital of Bangladesh, under a constant...

article

Magnetization and Spin Polarization of Heusler Alloys Co $_{2}$TiSn and Co$_{2}$ TiGa$_{0.5}$Sn $_{0.5}$

Ryutaro Ooka, Iduru Shigeta, Yoshimi Sukino, Yutaro Fujimoto, more

IEEE Magnetics Letters > 2017 > 8 > 1 - 4

The substitution effect on half-metallicity for Co-based Heusler alloys Co

$_{2}$

TiGa

$_{1-x}$

$_{x}$

was investigated by experimental measurements and first-principles band calculations. The synthesized alloys crystalized in the ordered

$L2_1$

crystal structure. The spontaneous magnetization obeyed the Slater–Pauling rule, indicating the possibility that Co

$_{2}$

TiSn and Co

$_{2}$

TiGa

$_{0.5}$

Sn...

article

Scintillation properties of a La, Lu-admix gadolinium pyrosilicate crystal

Shunsuke Kurosawa, Toetsu Shishido, Akira Suzuki, Takamasa Sugawara, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2015 > 784 > C > 115-118

In order to obtain new scintillator with higher effective atomic number, a pyrosilicate crystal with a composition (Ce_0.01, Gd_0.54, La_0.25, Lu_0.20)₂Si₂O₇ (Ce:LaLu-GPS) was grown by the floating zone method. Emission wavelengths of this material were at 370 and 390nm. Gamma-ray-excited pulse height and scintillation decay measurement showed that Ce:LaLu-GPS had a light output of 34,000±2000 photons/MeV,...

article

Luminescence study on Eu or Tb doped lanthanum–gadolinium pyrosilicate crystal

Shunsuke Kurosawa, Toetsu Shishido, Takamasa Sugawara, Akiko Nomura, more

Optical Materials > 2015 > 41 > C > 80-83

(Eu_0.01, Gd_0.90, La_0.09)₂Si₂O₇ (Eu:La–GPS) and (Tb_0.01, Gd_0.9₀, La_0.09)₂Si₂O₇ (Tb:La–GPS) crystals were grown by the floating zone method, and their optical and scintillation properties were investigated. Gd³⁺-to-Tb³⁺ or –Eu³⁺ energy transfer processes were found, and photo-luminescence and radio-luminescence emission spectra showed ⁵D₀–⁷F_i (i=1–4) Eu³⁺ transitions in Eu:La–GPS, and ⁵D₃–⁷F_i (i=3–6)...

article

Scintillation properties of Ce:(La,Gd)2Si2O7 at high temperatures

Shunsuke Kurosawa, Toetsu Shishido, Takamasa Sugawara, Akiko Nomura, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2015 > 772 > C > 72-75

Temperature dependence of scintillation properties was investigated for (Ce_0.01, Gd_0.90, La_0.09)₂Si₂O₇ grown by floating zone method. The light output over 35,000 photons/MeV was found constant in the temperature range from 0°C to 150°C. In addition, FWHM energy resolution of Ce:La-GPS (roughly 7–8%) at 662keV remained constant up to 100°C. Thus, this crystal can be applied to oil well logging or...

article

Effects of low-energy electron beam irradiation on flexural properties of self-curing acrylic resin

Kyosuke Ito, Akiko Nomura, Shuichi Nomura, Kouichi Watanabe

Journal of Prosthodontic Research > 2014 > 58 > 1 > 55-61

The purpose of this study was to confirm the effectiveness of LEB irradiation onto the polymer powder for improving the mechanical properties of self-curing acrylic resin.The polymer powder of self-curing acrylic resin was irradiated with total LEB doses of 25, 50, 75 or 100kGy. Non-irradiated powder was used as a control. After LEB irradiation, ESR measurement, weight-average molecular weight measurement...

article

Evaluation of newly developed devices for denture placement and removal in the dependent elderly

Maiko Kawasaki, Shuichi Nomura, Naoto Okada, Akiko Nomura, more

Gerodontology > 29 > 2 > e703 - e709

doi: 10.1111/j.1741‐2358.2011.00547.x Evaluation of newly developed devices for denture placement and removal in the dependent elderly Objective: The purpose of this study was to subjectively evaluate the utility of newly developed denture placement and removal devices. Objective observations were also made to support the evidence. Materials and method: Twenty‐one subjects were instructed to place...

article

Phosphopeptides Designed for 5-Methylcytosine Recognition

Akiko Nomura, Akimitsu Okamoto

Biochemistry > 2011 > 50 > 16 > 3376 - 3385

article

Impact of amorphous Ge thin layer at the amorphous Si/Al interface on Al-induced crystallization

Hidehiro Suzuki, Noritaka Usami, Akiko Nomura, Toetsu Shishido, more

Journal of Crystal Growth > 2010 > 312 > 22 > 3257-3260

We investigated the impact of an amorphous Ge (a-Ge) thin layer inserted at the amorphous Si (a-Si)/Al interface on Al-induced crystallization. In situ observation of the growth process clarified that the nucleation rate is drastically reduced by insertion of a-Ge, which led to increase in the average size of crystal grains. This was interpreted as resulting from decrease in the driving force of crystallization,...

article

Osmium Complexation of Mismatched DNA: Effect of the Bases Adjacent to Mismatched 5-Methylcytosine

Akiko Nomura, Kazuki Tainaka, Akimitsu Okamoto

Bioconjugate Chemistry > 2009 > 20 > 3 > 603 - 607

article

Structural variations of ScRh3Bx (x=0–1) phase studied by transmission electron microscopy

Kunio Yubuta, Akiko Nomura, Kazuo Nakajima, Toetsu Shishido

Journal of Alloys and Compounds > 2009 > 471 > 1-2 > 341-346

We have examined structural ordering of a Cu ₃ Au-type compound ScRh ₃ B _x (x=0–1) by electron diffraction and high-resolution transmission electron microscopy (HRTEM). The electron diffraction patterns reveal 1/21/21/2-type superlattice reflections in a B content range of 0.5≤x≤0.75, where an anomalous drop of hardness was observed. This behavior is quite similar in a CeRh...

article

X-ray photoelectron spectroscopic studies on oxidation behavior of nickel and iron aluminides under oxygen atmosphere at low pressures

Naofumi Ohtsu, Akiko Nomura, Masaoki Oku, Toetsu Shishido, more

Applied Surface Science > 2008 > 254 > 17 > 5336-5341

Oxidation behaviors of NiAl, Ni ₃ Al, and FeAl under oxygen atmosphere at low pressures were studied by X-ray photoelectron spectroscopy (XPS). Clean surfaces of these aluminides were prepared by fracturing in an ultra high vacuum, and then the fractured surfaces were oxidized by exposing to high-purity oxygen at pressures up to 1.3Pa without exposing to air. The oxides formed on NiAl and...

article

In situ observation of Si faceted dendrite growth from low-degree-of-undercooling melts

Kozo Fujiwara, Kensaku Maeda, Noritaka Usami, Gen Sazaki, more

Acta Materialia > 2008 > 56 > 11 > 2663-2668

We directly observed the transition of crystal growth behavior of Si in a low undercooling region. We succeeded in observing the initiation of faceted dendrite growth from a portion of parallel twins with increasing degrees of undercooling. The critical undercooling for growing a faceted dendrite was experimentally determined to be ΔT=10K. We also confirmed that parallel twins associated with faceted...

article

X-ray photoelectron spectroscopic studies on initial oxidation of iron and manganese mono-silicides

Naofumi Ohtsu, Masaoki Oku, Akiko Nomura, Takamasa Sugawara, more

Applied Surface Science > 2008 > 254 > 11 > 3288-3294

Initial oxidation of iron and manganese mono-silicides (FeSi and MnSi) surfaces was studied by X-ray photoelectron spectroscopy (XPS). Clean surfaces of these silicides were prepared by fracturing in an ultra high vacuum, and then the fractured surfaces were oxidized by exposing to high-purity oxygen at pressures up to 1.3Pa. For the clean FeSi surface, positive chemical shifts of the Fe 2p _3/2...

article

An Osmium−DNA Interstrand Complex: Application to Facile DNA Methylation Analysis

Kazuo Tanaka, Kazuki Tainaka, Tadashi Umemoto, Akiko Nomura, more

Journal of the American Chemical Society > 2007 > 129 > 46 > 14511 - 14517

article

Crystal structure of a Cu3Au-type compound CeRh3B0.5 studied by high-resolution electron microscopy

Kunio Yubuta, Akiko Nomura, Kazuo Nakajima, Toestu Shishido

Journal of Alloys and Compounds > 2006 > 426 > 1-2 > 308-311

We have examined the structure of a Cu ₃ Au-type compound CeRh ₃ B _0.5 by means of electron diffraction and high-resolution electron microscopy. The observed electron diffraction patterns of CeRh ₃ B _0.5 show the appearance of 1/21/21/2-type superlattice reflections and fine satellite reflections around all reflections. These features have not been detected...

article

Growth of structure-controlled polycrystalline silicon ingots for solar cells by casting

Kozo Fujiwara, Wugen Pan, Noritaka Usami, Kohei Sawada, more

Acta Materialia > 2006 > 54 > 12 > 3191-3197

We propose a new concept of growing a polycrystalline Si ingot suitable for solar cells by casting based on the directional growth behavior of polycrystalline Si investigated using an in situ observation system. The cooling conditions for the Si melt were crucial for controlling growth in the initial stage. At a high cooling rate, dendrite growth occurred along the crucible wall. This growth mechanism...

article

Mechanism of tail-mediated inhibition of kinesin activities studied using synthetic peptides

Hisashi Yonekura, Akiko Nomura, Hitomi Ozawa, Yoshiro Tatsu, more

Biochemical and Biophysical Research Communications > 2006 > 343 > 2 > 420-427

We used a truncated form of human conventional kinesin (K560) and a set of synthetic tail-derived peptides to investigate the mechanism by which the kinesin tail domain inhibits the protein’s ATPase and motor activities. A peptide that spans residues 904–933 (C3) exhibited the strongest inhibitory effect on steady-state motility and ATPase activity. This inhibition reflected diminished binding of...

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Keywords

SCINTILLATOR (3)
ELECTRON DIFFRACTION (2)
X-RAY PHOTOELECTRON SPECTROSCOPY (2)
SCRH 3 B X C 1 - X (1)
(CE0.01, GD0.90, LA0.09)2SI2O7 (1)
A1. MISFIT DISLOCATION (1)
A1. NUCLEATION (1)
A1. PREFERENTIAL ORIENTATION (1)
A1. SOLID SOLUTIONS (1)
A1. SOLUBILITY (1)
A3. AL-INDUCED CRYSTALLIZATION (1)
ADENOVIRUS (1)
ANDREEV REFLECTION (1)
ANTIOXIDANTS (1)
ATPASE (1)
AUTOINHIBITION (1)
B1. SILICON–GERMANIUM (1)
B2. SIGE (1)
B3. SOLAR CELL (1)
BORON NONSTOICHIOMETRY (1)
CASTING (1)
CD MEASUREMENT (1)
CE-DOPED (LA, LU, GD)2SI2O7 (1)
CELL CYCLE (1)
CERH3B0.5 (1)
CHROMIUM SILICIDE (1)
COORDINATION GEOMETRY (1)
COPPER (1)
CROSS-LINKING (1)
CRYSTAL GROWTH (1)
CRYSTAL STRUCTURE (1)
CU3AU-TYPE (1)
CYSHIS3-TYPE (1)
DENDRITIC GROWTH (1)
DENTURE (1)
DEPENDENT ELDERLY (1)
DEVICE (1)
DHAKA (1)
DNA BINDING (1)
ENZYME MODELS (1)
FACETED DENDRITE (1)
FLEXURAL STRENGTH (1)
FRACTURING (1)
GADOLINIUM PYROSILICATE (1)
HALF-METAL (1)
HARDNESS (1)
HEUSLER ALLOY (1)
HIGH-RESOLUTION ELECTRON MICROSCOPY (1)
HYDROLYTIC ACTIVITY (1)
IMATINIB MESYLATE (1)
IN SITU FRACTURE (1)
IN VITRO MOTILITY (1)
INITIAL OXIDATION (1)
IRON SILICIDE (1)
JUNCTIONS (1)
KINESIN (1)
LEAD (1)
LEUKAEMIA (1)
LOW-ENERGY ELECTRON BEAM (1)
LUCIFERASE (1)
MAGNETIZATION (1)
MANGANESE SILICIDE (1)
MICROHARDNESS (1)
MICROTUBULE (1)
MODULATED STRUCTURE (1)
NICKEL AND IRON ALUMINIDES (1)
NOROVIRUS GII (1)
OIL WELL LOGGING (1)
OXIDATION BEHAVIOR UNDER OXYGEN ATMOSPHERE (1)
OXIDATION RESISTANCE (1)
PEPTIDE (1)
PEROVSKITE-TYPE PHASE (1)
PHASE IDENTIFICATION (1)
POLYMER POWDER (1)
PYROSILICATE CRYSTAL (1)
QUALITY OF LIFE (1)
REDOX CHEMISTRY (1)
REFLECTION (1)
RETROVIRUSES (1)
ROTAVIRUS A (1)
SELF-CURING ACRYLIC RESIN (1)
SEMICONDUCTOR (1)
SEWAGE (1)
SILICON (1)
SOLAR CELL (1)
SOLID SOLUTION (1)
SOLID/LIQUID INTERFACE (1)
SP1 (1)
SPIN ELECTRONICS (1)
SPIN POLARIZATION (1)
SUPERCONDUCTOR (1)
SUPERLATTICE REFLECTION (1)
TEMPERATURE MEASUREMENT (1)
TWIN BOUNDARY (1)
UNDERCOOLING (1)
X-RAY SCATTERING (1)
XPS (1)
ZINC FINGER (1)
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Elsevier (15)
ACS (9)
Wiley (3)
Springer (2)
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Journal of Alloys and Compounds (3)
Acta Materialia (2)
Applied Surface Science (2)
Biochemical and Biophysical Research Communications (2)
Inorganic Chemistry (2)
Journal of Crystal Growth (2)
Journal of the American Chemical Society (2)
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2)
The Journal of Organic Chemistry (2)
Biochemistry (1)
Bioconjugate Chemistry (1)
Chemistry – A European Journal (1)
European Journal of Nuclear Medicine and Molecular Imaging (1)
Food and Environmental Virology (1)
Gerodontology (1)
IEEE Magnetics Letters (1)
Journal of Prosthodontic Research (1)
Optical Materials (1)
Surface and Interface Analysis (1)
The Journal of Physical Chemistry B (1)
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INFONA - science communication portal

Search results for: Akiko Nomura

Superoxide Dismutase‐like Activity of Zeolitic Imidazolate Framework Nanoparticles Comprising Biomimetic Imidazolato‐bridged CuZn Units

XPS spectra of chromium monosilicides and disilicides obtained by in situ fractured clean surfaces

Alarming Situation of Spreading Enteric Viruses Through Sewage Water in Dhaka City: Molecular Epidemiological Evidences

Magnetization and Spin Polarization of Heusler Alloys Co $_{2}$TiSn and Co$_{2}$ TiGa$_{0.5}$Sn $_{0.5}$

Scintillation properties of a La, Lu-admix gadolinium pyrosilicate crystal

Luminescence study on Eu or Tb doped lanthanum–gadolinium pyrosilicate crystal

Scintillation properties of Ce:(La,Gd)2Si2O7 at high temperatures

Effects of low-energy electron beam irradiation on flexural properties of self-curing acrylic resin

Evaluation of newly developed devices for denture placement and removal in the dependent elderly

Phosphopeptides Designed for 5-Methylcytosine Recognition

Impact of amorphous Ge thin layer at the amorphous Si/Al interface on Al-induced crystallization

Osmium Complexation of Mismatched DNA: Effect of the Bases Adjacent to Mismatched 5-Methylcytosine

Structural variations of ScRh3Bx (x=0–1) phase studied by transmission electron microscopy

X-ray photoelectron spectroscopic studies on oxidation behavior of nickel and iron aluminides under oxygen atmosphere at low pressures

In situ observation of Si faceted dendrite growth from low-degree-of-undercooling melts

X-ray photoelectron spectroscopic studies on initial oxidation of iron and manganese mono-silicides

An Osmium−DNA Interstrand Complex: Application to Facile DNA Methylation Analysis

Crystal structure of a Cu3Au-type compound CeRh3B0.5 studied by high-resolution electron microscopy

Growth of structure-controlled polycrystalline silicon ingots for solar cells by casting

Mechanism of tail-mediated inhibition of kinesin activities studied using synthetic peptides

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