result 96 件
JaLCDOI | 10.18926/19596 |
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FullText URL | Mem_Fac_Eng_OU_31_2_45.pdf |
Author | Osaka, Akiyoshi| Kobayashi Keizo| Hayakawa, Satoshi| Ohtsuki, Chikara| |
Abstract | The thermal expansion coefficient of some bioactive glasses in the system CaO-SiO(2)-B(2)O(3) were adjusted to be similar to that of titanium by controlling the composition. A glass of composition 45CaO・30SiO(2)・25B(2)O(3) was selected among those as the enameling glass. A slurry was prepared by mixing the glass powder and ethanal to be developed on titanium and heated at 740℃ for 30 min. Thus treated specimen was soaked in a simulated body fluid (Kokubo solutiion). FT-IR reflection and thin film X-ray diffraction analyses indicated apatite formation on the glass coating layer within 12 h of soaking in the fluid. Thus titanium could be provided with bioactivity due to the enameling. |
Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
Published Date | 1997-03-28 |
Volume | volume31 |
Issue | issue2 |
Start Page | 45 |
End Page | 51 |
ISSN | 0475-0071 |
language | English |
File Version | publisher |
NAID | 120002309181 |
JaLCDOI | 10.18926/19594 |
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FullText URL | Mem_Fac_Eng_OU_31_2_39.pdf |
Author | Imayoshi Naoki| Hayakawa, Satoshi| Ohtsuki, Chikara| Osaka, Akiyoshi| |
Abstract | Nb(2)O(5)-and Ta(2)O(5)-doped calcium si1icate glasses were soaked for various periods in a simulated body fluid(Kokubo solution) up to 30 days. Apatite formation ability of the surface of these glasses were investigated with thin-film X-ray diffraction and FT-IR reflection spectroscopy. The effects of these additive oxides on the bioactivity of CaO・SiO(2) based glass were discussed. A small amount of Nb(2)O(5) and Ta(2)O(5) suppressed the rate of silica hydrogel layer formation and the apatite formation on the surface of the glasses. The rate of the apatite nucleation on the surface of Nb(2)O(5)-doped calcium silicate glass was slower than that on the surface of Ta(2)O(5)-doped calcium silicate glass. It was concluded that the decrease in the apatite forming ability of calcium silicate glasses by these additive oxides is attributed to the suppression of formation of silica hydrogel layer which plays an important role in apatite nucleation. |
Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
Published Date | 1997-03-28 |
Volume | volume31 |
Issue | issue2 |
Start Page | 39 |
End Page | 44 |
ISSN | 0475-0071 |
language | English |
File Version | publisher |
NAID | 120002309151 |
Author | Joja, Ikuo| Hiraki, Yoshio| Ueda, Hiroyuki| Nakamura, Tetsuya| Yamamoto, Yoshio| Kaji, Mitumasa| Togami, Izumi| Niiya, Harutaka| Shirakami, Toshiaki| Hayashi, Hidehiro| Kimoto, Shin| Aono, Kaname| Sugita, Katsuhiko| Ueoka, Hiroshi| Ohnoshi, Taisuke| Kimura, Ikuro| |
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Published Date | 1985-10-30 |
Publication Title | 岡山医学会雑誌 |
Volume | volume97 |
Issue | issue9-10 |
Content Type | Journal Article |
JaLCDOI | 10.18926/15685 |
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FullText URL | Mem_Sch_Eng_OU_10_2_25.pdf |
Author | Torii, Sigeru| Tanaka, Hideo| |
Abstract | Ethyl dl-jasmonate (1a) and ethyl dl-2-epi-jasmonate (1b), novel constitutents in jasmin absolute from Italian Jasminum grandiflorum L, were prepared from 8-endo-(2'-cis-pentenyl)-3-oxo-2-oxa-bicyclo [3.2.1] octane, jasmine acid δ-lactone(2). Improvement of the preparation of the intermediate (9), a key precursor of (2), was made by different route via lactonization of (7) and/or (8). NMR and IR spectra (la) and (1b) are given. |
Publication Title | Memoirs of the School of Engineering, Okayama University |
Published Date | 1976-01-27 |
Volume | volume10 |
Issue | issue2 |
Start Page | 25 |
End Page | 30 |
ISSN | 0475-0071 |
language | English |
File Version | publisher |
NAID | 120002307609 |
JaLCDOI | 10.18926/15543 |
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FullText URL | Mem_Sch_Eng_OU_1_44.pdf |
Author | Takeda Akira| Torii Sigeru| |
Abstract | Acetylation of γ,γ-dimethyl-α,β-dicarbethoxybutyrolactone in benzene in the presence of sodium hydride was attempted. The structure of the condensation product was assigned to O-acetyl derivative, which was converted into γ,γ-dimethyl-β-carbethoxy-α-carboxybutyrolactone whose structure is also discussed by IR spectrum. |
Publication Title | Memoirs of the School of Engineering, Okayama University |
Published Date | 1966-03-31 |
Volume | volume1 |
Issue | issue1 |
Start Page | 44 |
End Page | 46 |
ISSN | 0475-0071 |
language | English |
File Version | publisher |
NAID | 120002307861 |
JaLCDOI | 10.18926/15462 |
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FullText URL | Mem_Fac_Eng_OU_23_1_39.pdf |
Author | Osaka, Akiyoshi| Yuasa Motokazu| Miura, Yoshinari| Takahashi, Katsuaki| |
Abstract | Sodium borosilicate gels of compositions similar to that of Vycor(R) glass like 80SiO(2).15B(2)O(3).5Na(2)O (wt%) were prepared from hydrolysis and polycondensation of metal alkoxides under the HCl catalysis. Variation of specific surface area and porosity with temperature indicated that closed pores were opened below 400℃, and collapsed above 450℃ after the porosity reached a maximum value around 450℃. The structural evolution was examined due to IR spectra and a phase separation in the gels was observed. The solubility of the gels into 1N-HCl was studied as a function of the treatment temperature. |
Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
Published Date | 1988-11-22 |
Volume | volume23 |
Issue | issue1 |
Start Page | 39 |
End Page | 48 |
ISSN | 0475-0071 |
language | English |
File Version | publisher |
NAID | 120002307518 |
JaLCDOI | 10.18926/15428 |
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FullText URL | Mem_Fac_Eng_OU_29_2_83.pdf |
Author | Tsuru, Kanji| Nishiyama Chikako| Ohtsuki, Chikara| Osaka, Akiyoshi| |
Abstract | One of the CaO,SiO(2)-based bioactive glasses(5OCaO・ 5OSiO (2) in mol%) were soaked for various periods in a simulated body fluid(SBF) with or without containing alcohols such as methanol, ethanol, and 1-propanol. Effect of the alcohols was investigated on the apatite formation on the glass surface with thin-film X-ray diffraction, FT-IR reflection spectroscopy and scanning electron microscopy. Under the presence of alcohols up to 0.1mol/l in the SBF an apatite layer was formed on the glass, while it consisted of crystallites similar in morphology but larger in size than that found for the SBF without the alcohols. It was concluded that the alcohols little influenced the the apatite forming ability of the CaO,SiO(2)-based glasses. |
Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
Published Date | 1995-03-27 |
Volume | volume29 |
Issue | issue2 |
Start Page | 83 |
End Page | 88 |
ISSN | 0475-0071 |
language | English |
File Version | publisher |
NAID | 120002307301 |
JaLCDOI | 10.18926/15426 |
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FullText URL | Mem_Fac_Eng_OU_29_2_77.pdf |
Author | Tsuru, Kanji| Nishiyama Chikako| Ohtsuki, Chikara| Osaka, Akiyoshi| |
Abstract | Poly(methyl methacrylate) substrates were immersed in suspensions containing bioactive 50CaO・50SiO(2) (mol%) glass particles (45 μm in diameter) and a 6:4 (volume fraction) mixture of ethanol and THF, and an ultrasonic energy was applied to the system. A layer of glass particles was implanted and covered more than 50% of the substrate surface. Thin film X-ray diffraction patterns and FT-IR reflection spectra indicated deposition of apatite on the glass-implanted substrates after they were soaked for 12 h in a simulated body fluid similar in apatite-deposition ability to the human blood plasma. Flake-like apatite crystallites formed on the substrate soaked in SBF for 3 days. |
Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
Published Date | 1995-03-27 |
Volume | volume29 |
Issue | issue2 |
Start Page | 77 |
End Page | 81 |
ISSN | 0475-0071 |
language | English |
File Version | publisher |
NAID | 120002307332 |
JaLCDOI | 10.18926/15363 |
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FullText URL | Mem_Fac_Eng_OU_34_39.pdf |
Author | Hayakawa, Satoshi| Shirosaki, Yuki| Yabuta, Takeshi| Tsuru, Kanji| Ohtsuki Chikara| Osaka, Akiyoshi| |
Abstract | Silicone elastomer was chemically treated at 60℃ for 7 days with 30 wt% H(2)O(2) solutions with or without TaCl(5) and soaked for various periods in a simulated body fluid(Kokubo solution) up to 21 days. Apatite formation ability of the surface of the silicone elastomer specimens was investigated with thin-film X-ray diffraction and FT-IR reflection spectroscopy. These silicone specimens did not deposit apatite or calcium phosphates, irrespective of chemical treatment. Osteoblast-like cells (MC3T3-El) derived from mouse were cultured on the specimens at 36.5℃ under 5%C0(2) and 95% humidity. Similar degree of proliferation of cells was observed at 7 days among three specimens, while the no treatment specimen after incubation for 5 days showed a lower degree of proliferation than the silicone treated with 30 wt% H(2)O(2) solutions with or without TaCl(5). Alkaline phosphatase activity of the cells proliferated on the no treatment specimen was lower than those of the silicone treated with 30 wt% H(2)O(2) solutions with or without TaCl(5). These results indicate that the cytotoxicity of the silicone could be improved by the chemical treatment with 30 wt% H(2)O(2) solutions with or without TaCl(5). |
Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
Published Date | 2000-03-27 |
Volume | volume34 |
Issue | issue1-2 |
Start Page | 39 |
End Page | 43 |
ISSN | 0475-0071 |
language | English |
File Version | publisher |
NAID | 120002308019 |
Author | Yamashita, Hidetoshi| |
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Published Date | 1991 |
Publication Title | 岡山医学会雑誌 |
Volume | volume103 |
Issue | issue11-12 |
Content Type | Journal Article |
Author | Fujiwara, Noriaki| |
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Published Date | 1990-04 |
Publication Title | 岡山医学会雑誌 |
Volume | volume102 |
Issue | issue3-4 |
Content Type | Journal Article |
Author | Okino, Takeshi| |
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Published Date | 1990-02 |
Publication Title | 岡山医学会雑誌 |
Volume | volume102 |
Issue | issue1-2 |
Content Type | Journal Article |
Author | Yokota, Satoshi| |
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Published Date | 1992 |
Publication Title | 岡山医学会雑誌 |
Volume | volume104 |
Issue | issue5-6 |
Content Type | Journal Article |
Author | Kurihara, Makoto| |
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Published Date | 1992 |
Publication Title | 岡山医学会雑誌 |
Volume | volume104 |
Issue | issue5-6 |
Content Type | Journal Article |
Author | Nishijima, Yutaka| |
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Published Date | 1992 |
Publication Title | 岡山医学会雑誌 |
Volume | volume104 |
Issue | issue5-6 |
Content Type | Journal Article |
Author | Shibayama, Takuo| |
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Published Date | 1993 |
Publication Title | 岡山医学会雑誌 |
Volume | volume105 |
Issue | issue3-4 |
Content Type | Journal Article |
Author | Kitagawa, Takahiro| |
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Published Date | 1994 |
Publication Title | 岡山医学会雑誌 |
Volume | volume106 |
Issue | issue3-4 |
Content Type | Journal Article |
Author | Ueta, Ikuhiro| |
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Published Date | 1993 |
Publication Title | 岡山医学会雑誌 |
Volume | volume105 |
Issue | issue3-4 |
Content Type | Journal Article |
JaLCDOI | 10.18926/ESR/13934 |
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FullText URL | ESR_3_47.pdf |
Author | Matsuda, Toshihiko| Kurosaki, Makoto| |
Abstract | Several specimens of rectorite-type regularly interstratified mineral (including Ca-rich one of hydrother-mal origin) from roseki deposits together with a few rectorites were examined by chemical analysis, X-ray diffraction and IR spectroscopy. These specimens are rich in SiO2, AI2O3 and H2O in addition to considerable amounts of CaO, Na2O and K2O. The Ca content in mica-like layers ranges from a slight amount to exceeding 50% of the total interlayer population. For the Ca-bearing specimens, AI-for-Si substitution in the tetrahedral sheets of mica-like layers increases in proportion to the Ca contents. Characteristic absorption bands of 950-900 cm-1 and 700-670 cm-1 are observed in IR spectra. The bands are due to AI-for-Si substitution in the tetrahedral sheets. Judging from the chemical analysis and IR spectra, the component of mica-like layer rich in Ca is not that of mica but mainly that od margarite (brittle mica). Expansion characteristics of the Ca-rich mineral are similar to rectorite and expandable layer is close to beidellite. The mineral is somewhat less expandable than rectorite under the condition of RH70-80% (Na-saturation) and EG treatment (K-saturation). The rectorite-type Ca-rich mineral reported here is simlar to rectorite in its expansion characteristics, but the component of mica-like layers is different from that of rectorite. Mica-like layer of the mineral must be mainly composed of margarite-like layer. The mineral is mainly composed of a 1 : 1 regular interstratification of dioctahedral britlle mica (margarite) and smectite (beidellite). The mineral does not strictly correspond to rectorite, defined as a 1 : 1 interstratified mineral of dioctahedral mica and smectite. |
Keywords | rectorite brittle mica/smectite margarite regular interstrarification |
Publication Title | Okayama University Earth Science Report |
Published Date | 1996-09-20 |
Volume | volume3 |
Issue | issue1 |
Start Page | 47 |
End Page | 56 |
ISSN | 1340-7414 |
language | English |
Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
File Version | publisher |
NAID | 120002310640 |
Author | Ueki, Koubun| |
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Published Date | 1994-08 |
Publication Title | 岡山医学会雑誌 |
Volume | volume106 |
Issue | issue7-8 |
Content Type | Journal Article |