A5048348103- Crystal Structures and Properties
- Chemical Synthesis and Characterization
- Advanced machining processes and optimization
- X-ray Diffraction in Crystallography
- Geological and Geochemical Analysis
- Clay minerals and soil interactions
- Advanced Surface Polishing Techniques
- Mineralogy and Gemology Studies
- Air Quality Monitoring and Forecasting
- Advanced Polymer Synthesis and Characterization
- Crystallization and Solubility Studies
- Polyoxometalates: Synthesis and Applications
- Atmospheric chemistry and aerosols
- biodegradable polymer synthesis and properties
- Engineering Technology and Methodologies
- Inorganic Chemistry and Materials
- Tunneling and Rock Mechanics
- Metal Extraction and Bioleaching
- Nuclear materials and radiation effects
- Plant and animal studies
- Dendrimers and Hyperbranched Polymers
- Terahertz technology and applications
- Atmospheric and Environmental Gas Dynamics
- earthquake and tectonic studies
- High-pressure geophysics and materials
Okayama University
1993-2019
Okayama University of Science
1996-2005
Montmorillonite, a bioinert clay mineral, was examined as novel vector for an oral gene-delivery system. The complex of montmorillonite and plasmid DNA encoding the enhanced green fluorescent protein (EGFP) gene prepared at various weight ratios, then transfected into cultured intestinal epithelial cells (IEC-6) in vitro. EGFP clearly transcribed when transfection performed using montmorillonite–plasmid ratio 0.05:1. In contrast, no expression detected by reverse transcription-polymerase...
The title compound, a new polymorphic phase of dicobalt diphosphate, Co2P2O7, was prepared by hydrothermal methods. structure contains CoO6 coordination octahedra and P2O7 radicals. radicals, connected edge sharing, form six-membered rings, which are further interconnected to two-dimensional zigzag sheets parallel (001). groups link these build three-dimensional networks.
Schulenbergite and its Zn-dominant analogue occur in the Hirao mine, Osaka Prefecture, Japan. The minerals were found as crusts on same gallery wall cracks of altered shale. aggregates hexagonal platy crystals up to 0.5 mm across 0.05 thick. schulenbergite is greenish blue blue-green color, Cu/(Cu + Zn) molar ratio varies from 0.67 0.42. pale 0.30 0.21. average unit cell parameters calculated X-ray powder diffraction data were: a = 8.256 (2) c 7.207 (3) Å, 8.292 7.271 (4) respectively. It...
Background: A number of studies have linked long-term exposure to particulate matter with aerodynamic diameter <2.5 µm (PM 2.5 ) mortality, but most these were conducted in Europe and North America. Studies Asian countries had been at relatively high exposures. We evaluated the association PM natural-cause cause-specific mortality Japan, where levels are low compared other countries. Methods: cohort 75,531 participants underwent basic health checkups Okayama City 2006 or 2007. followed...
Tetrasodium heptacobalt hexaphosphate, a new monophosphate prepared by hydrothermal methods, comprises CoO6 and CoO4 coordination polyhedra connected to each other corner edge sharing form zigzag layers parallel the ab plane. These are interconnected Co – O P tetrahedra via three-dimensional network. The Na+ ions located in tunnels running axis. This compound is isostructural with Na4Ni7(PO4)6.
Inyoite was found as fissure fillings in calcium borate minerals, which occur an irregularly shaped body the crystalline limestone near gehlenite-spurrite skarns at Fuka mine, Okayama Prefecture, Japan. occurs aggregates of tabular crystals up to 1 mm wide, and rarely euhedral 0.5 wide fissures minerals such nifontovite, pentahydroborite, sibirskite parasibirskite. The are composed only inyoite. This is first finding inyoite type occurrence also different from those many other localities...
Numanoite, the Cu analogue of borcarite, is found in an irregular patch crystalline limestone near gehlenite–spurrite skarns at Fuka mine, Okayama Prefecture, Japan. Numanoite (up to 1 mm across) observed as a core or zones borcarite crystals up 5 long. The mineral also veinlets 0.4 wide aggregates crystals. associated minerals are nifontovite, bultfonteinite, calcite and unidentified magnesium silicate mineral. In hand specimen, blue-green colorless transparent with vitreous luster. streak...
The structure belongs to the monophosphate group and contains one type of PO 4 tetrahedra connected MgO 6 octahedra by corner sharing. These -MgO groups are along two shorter a b axes form two-dimensional zigzag sheets. Two sheets longer c axis types Na-O polyhedra. Pairs in H atoms situated at centres symmetry, forming short hydrogen bonds.
Uralborite, CaB2O2(OH)4, was found in a vein consisting of borate minerals that cut into crystalline limestone at Fuka, Okayama Prefecture, Japan. It occurs as aggregates fibrous crystals up to 0.2 mm long and euhedral 7 3 wide, association with sibirskite, borcarite, fluorite calcite. Electron microprobe analyses ICP gave the empirical formula Ca1.006B2.019O2.069(OH)3.931 on basis O=6. X-ray powder diffraction were indexed monoclinic cell, a=6.923(1), b=12.326(1), c=9.831(1)Å, β=97.09(1)°,...
Baghdadite was found in a spurrite zone skarns at Fuka, Okayama Prefecture, Japan. It occurs as anhedral grains up to 0.5 mm length and prismatic crystals 0.6×0.4×0.2 mm, association with gehlenite, spurrite, tilleyite, perovskite, grandite garnet vesuvianite. The empirical formula of the mineral is (Ca3.03Na0.01)Σ3.04(Zr0.83Ti0.15)Σ0.98(Si1.99Al0.01Fe0.01)Σ2.01O9 on basis O=9, which consistent ideal Ca3ZrSi2O9. unit cell parameters are a=10.429(2), b=10.170(2), c=7.365(1)Å β=91.01(1)°....
Ramsbeckite was found as a vein forming mineral in altered shale at the Hirao mine, Minoo, Osaka, Japan. It occurred aggregates of euhedral granular crystals up to 0.5 mm across, association with sphalerite, chalcopyrite, smithsonite, aurichalcite, amorphous manganese dioxide, schulenbergite, brochantite, serpierite, limonite and an unidentified mineral. emerald green blue-green color vitreous luster hand specimen. An EPMA CHNS/O analyzer gave empirical formula...
Hexahydroborite was found in a vein consisting of borate minerals which developed along the boundary between crystalline limestone and skarns at Fuka, Okayama Prefecture, Japan. occurred as aggregates pyramidal crystals up to 2mm wide on cavity wall, association with olshanskyite calcite. Wet analyses ICP-MS gave empirical formula Ca1.001B2.102O4.154·5.846H2O basis O=10, consistent ideal Ca[B(OH)4]2·2H2O. The reflections X-ray powder data for hexahydroborite from Fuka were indexed monoclinic...
Phase relationships for FeS polymorph have been studied at the pressure of 16-20 GPa and temperature 300-1350 K by in situ X-ray observation using a large volume high-pressure apparatus synchrotron radiation. Contrary to Fei's prediction [1], we found stability field NiAs-type phase extending least 18 GPa. Results correspond with NiAs-hexagonal boundary determined Kusaba et al . [2, 3]. Assuming straight boundary, estimate that NiAs-hexagonal-liquid triple junction is located 39.5 2300 K.
The title compound, magnesium sodium phosphate, Mg 5 Na 2 (PO 4 ) , belongs to a group of monophosphates which are constructed from five kinds coordination polyhedra: two PO tetrahedra connected by one type Mg-O octahedra situated at the centres symmetry; distorted five-coordinated polyhedra and another in general positions. Na-O occupy cavities formed these types polyhedra. density, D x this compound is 3.00 m -3 reflecting high-pressure synthesis. Similar compounds precipitated 1 atm,...
The structure of copper sodium monophosphate is built from two kinds Cu atoms occupying the centres symmetry a Dsp 2 square plane O atoms, with additional atoms; these Cu-O octahedra are linked by edge sharing to form chains parallel axis. PO 4 tetrahedra and Na-O polyhedra connect chains. another polymorph α-NaCuPO . former was synthesized at 2000 kg cm -2 (≅2×10 5 kPa pressure) 773 K, resulting in high density (d x =3.96 Mg m -3 ), while latter corresponds low-pressure conditions =3.61 ;...
Kimzeyite solid solution series (Ca3Zr2Al2SiO12–Ca3Zr2Fe2SiO12 abbreviated to Al100Fe0–Al0Fe100) have been investigated by hydrothermal syntheses and X-ray powder diffraction. The latter confirmed the splitting or broadening of diffraction peaks on specimens with initial composition Al50Fe50 quenched from temperature below 650°C. electron microprobe analyses were also carried out indicated existence two kinds crystal grains kimzeyite, each having a different composition. cell dimensions...