Yoshito Matsui

Tokushima University

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Unit cell dimensions of some synthetic olivine group solid solutions

GEOCHEMICAL JOURNAL (1968)

Yoshito Matsui Yasuhiko Syono

Two series of solid solutions of olivine structure, (Mg, Co)2SiO4 and (Mg, Ni)2SiO4, were synthesized at 1, 400°C, and their unit cell parameters were measured at room temperature. It was found that deviations from Vegard's law increase according to the order (Mg, Fe)2SiO4, (Mg, Co)2SiO4 and (Mg, Ni)2SiO4. This order coincides with the order of octahedral crystal field stabilization energies of transition metal ions. It was suggested that the site preference of Mg and transition metal ions over MI and MII sites is most pronounced in the case of (Mg, Ni)2SiO4 solid solution series.

10.2343/geochemj.2.51

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Citations (59)

Computer Simulation in Mineralogy — A Futuristic View

Journal of the Mineralogical Society of Japan (1987)

Yoshito Matsui

Recent development in computer-aided “mineral physics” is briefly discussed on three ex-amples : non-empirical quantum mechanical calculation and elasticity-constrained cohesive energy minimization (WMIN) calculation on MgSi03 orthorhombic perovskite ; molecular dynamics (MD) calculation on dynamic structure in high-cristobalite ; and MD calculation on the hypothetical transition of Si02 from the fluorite structure to the α-PbO2 structure. It is hoped that this sort of approach will be accepted by the community of “traditional” mineralogists in Japan.

Fluorite

Orthorhombic crystal system

10.2465/gkk1952.17.253

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Citations (0)

Chondromodulin is necessary for cartilage callus distraction in mice

PLoS ONE (2023)

Kiminori Yukata Chisa Shukunami Yoshito Matsui Aki Takimoto Tomohiro Goto

Chondromodulin (Cnmd) is a glycoprotein known to stimulate chondrocyte growth. We examined in this study the expression and functional role of Cnmd during distraction osteogenesis that is modulated by mechanical forces. The right tibiae of the mice were separated by osteotomy and subjected to slow progressive distraction using an external fixator. In situ hybridization and immunohistochemical analyses of the lengthened segment revealed that Cnmd mRNA and its protein in wild-type mice were localized in the cartilage callus, which was initially generated in the lag phase and was lengthened gradually during the distraction phase. In Cnmd null ( Cnmd −/− ) mice, less cartilage callus was observed, and the distraction gap was filled by fibrous tissues. Additionally, radiological and histological investigations demonstrated delayed bone consolidation and remodeling of the lengthened segment in Cnmd −/− mice. Eventually, Cnmd deficiency caused a one-week delay in the peak expression of VEGF , MMP2 , and MMP9 genes and the subsequent angiogenesis and osteoclastogenesis. We conclude that Cnmd is necessary for cartilage callus distraction.

Callus

10.1371/journal.pone.0280634

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Citations (2)

The Post-Ilmenite Phases of Silicates, Germanates, and Titanates: A Review

High‐pressure science and technology (1979)

Etsuro Ito Yoshito Matsui

The most significant findings in the recent high-pressure phase equilibrium studies relevant to the constitution of the deep mantle are believed to be the stable existence of MgSiO3 ilmenite [1,2] and MgSiO3 orthorhombic perovskite [2–5]. It also has been reported that the pyrope garnet transforms to the ilmenite structure which further converts to the orthorhombic perovskite at still higher pressures [6]. Therefore it is possible that the silicate perovskite is the major constituent in the lower mantle, and that the ilmenite phase is of importance in the lower-half of the transition zone.

Ilmenite

Pyrope

Orthorhombic crystal system

Silicate perovskite

10.1007/978-1-4684-7470-1_140

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Citations (0)

Partition of divalent transition metals between coexisting ferromagnesian minerals

Chemical Geology (1970)

Yoshito Matsui Shohei Banno

Divalent

10.1016/0009-2541(70)90043-4

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Citations (8)

On the variation in relative abundances of rare earth elements among meteorites, igneous rocks and sediments

Geochimica et Cosmochimica Acta (1963)

Yoshito Matsui Akimasa Masuda

Table (database)

Rare-earth element

10.1016/0016-7037(63)90087-5

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Citations (8)

Mössbauer study of synthetic calcium-rich pyroxenes

GEOCHEMICAL JOURNAL (1970)

Yoshito Matsui Yonezo Maeda Yasuhiko Syono

In the calcium-rich pyroxenes Fe2+ ion in the M1 positions gives rise to the inner Mössbauer doublet, and Fe2+ in M2 to the outer doublet. The Fe2+-Mg order over the M1 and M2 positions was found unexpectedly weak, being close to the complete disorder at about 1, 200°C. A four-line spectrum was observed in Di50Hd50 prepared by usual sintering technique at 1, 150°C. This may be due to the local disorder of Fe2+ and Ca. The disordered configuration seems to be metastable, and the reaction towards the ordered structure to be extremely sluggish.

Metastability

10.2343/geochemj.4.15

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Citations (10)

Magnetic Properties of the Disordered Ilmenite FeTiO3 II Synthesized at Very High Pressure

Springer eBooks (1982)

Yasuhiko Syono Hiroshi Yamauchi A. Ito Yoshiko Someya Eiji Ito

Ilmenite

10.1007/978-94-009-7825-6_45

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Citations (11)

Thermodynamic analyses of equilibria involving olivine, orthopyroxene and garnet

Geochimica et Cosmochimica Acta (1983)

Toshisuke Kawasaki Yoshito Matsui

Enstatite

Pyroxene

10.1016/0016-7037(83)90017-0

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Citations (65)

Pressure-induced Structural Transformations in Framework Crystal Structures

Molecular Simulation (1991)

Shinji Tsuneyuki Hideo Aoki Yoshito Matsui

Abstract Pressure-induced structural transformation of polymorphs of silica (SiO2) at room temperature is studied with the molecular dynamics method. Novel structural transitions are predicted in which the tetrahedral coordination of silicon to oxygen collectively collapses into an octahedral coordination without breaking any Si-O bonds. The relation between such transformations and the atomic diffusion in the liquid phase is briefly discussed.

10.1080/08927029108022431

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Citations (6)