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Digitale Medien

Preventive Effects of Traditional Chinese (Kampo) Medicines on Experimental Osteoporosis Induced by Ovariectomy in Rats (1997)

Hidaka, S. ; Okamoto, Y. ; Nakajima, K. ; [weitere]

Springer

Calcified tissue international 61 (1997), S. 239 -246

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ISSN: 1432-0827

Schlagwort(e): Key words: Ovariectomy — Chinese traditional (Kampo) medicines — Tibiae — Bone mineral density — Electron micrographs — Rat.

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin , Physik

Notizen: Abstract. Preventive effects by traditional Chinese (Kampo) medicines, Unkei-to, Hachimi-jio-gan, and Juzen-taiho-to, on the progress of bone loss induced by ovariectomy in rats were investigated for a period of 49 days. The bone mineral density (BMD) of tibia in ovariectomized (OVX) rats decreased by 20% from those in sham-operated (Sham) rats, with the decrease completely inhibited by the administration of any one of these Kampo medicines or 17β-estradiol. From scanning electron microscopic (SEM) analyses, the surface of a trabecular bone of tibia in OVX rats had a porous or erosive appearance, whereas that of the same bone in Sham rats was composed of fine particles. The administration of three Kampo medicines and 17β-estradiol to OVX rats preserved the fine particle surface of the trabecular bone. These results strongly suggest that any of these three gynecological Kampo medicines is as effective as 17β-estradiol in preventing the development of bone loss induced by ovariectomy in rats.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s002239900329

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Digitale Medien

Effect of boron-doping on structure and some properties of carbon-carbon composite (1996)

Sogabe, T. ; Nakajima, K. ; Inagaki, M.

Springer

Journal of materials science 31 (1996), S. 6469-6476

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ISSN: 1573-4803

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract Boron-doped carbon-carbon composites with boron concentration around 11–15 mass % were prepared from a carbon fibre felt with dispersed boron carbide powder by infiltration of pyrolytic carbon. The composite was heat treated at several different temperatures from 2000–2800 °C. The highest bending strength was obtained for the composite at a heat treatment temperature (HTT) of 2200 °C. Carbon fibre began to be destroyed after heat treatment at 2400 °C and the structure of the composite was drastically changed above 2600 °C where the anisotropy of the composite originally existing in the thermal expansion coefficient and the thermal conductivity has been faded away. X-ray diffraction measurement indicated that graphitization of the composite was enhanced by boron doping. At HTTs above 2400 °C, the composite became graphitic, the crystallite sizes of which were more than 100 nm in Lc (004) and La (110). It was shown that boron was uniformly distributed in the composite at an HTT of 2400 °C and also that heat treatment at higher temperatures, such as 2600 °C, incurred condensation of boron. Air-oxidation loss at 800 °C appeared to be the lowest for the composite with an HTT of 2400 °C and the rate of oxidation loss was 22 times lower than that of the non-boron-doped composite.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00356250

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