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Hayashi, Toshimitsu,Wakayama, Shuichi The Korean Society for Composite Materials 2009 Advanced composite materials Vol.18 No.1
The effect of porous matrix on thermal fatigue behavior of 3D-orthogonally woven SiC/SiC composite was evaluated in comparison with that having relatively dense matrix. The porous matrix yields open air passages through its thickness which can be utilized for transpiration cooling. On the other hand, the latter matrix is so dense that the air passages are sealed. A quantity of the matrix was varied by changing the number of repetition cycles of the polymer impregnation pyrolysis (PIP). Strength degradation of composites under thermal cycling conditions was evaluated by the $1200^{\circ}C$/RT thermal cycles with a combination of burner heating and air cooling for 200 cycles. It was found that the SiC/SiC composite with the porous matrix revealed little degradation in strength during the thermal cycles, while the other sample showed a 25% decrease in strength. Finally it was demonstrated that the porous structure in 3D-SiC/SiC composite improved the thermal fatigue durability.
Osamu Hayashi,Yuki Katayanagi,Kyoko Ishii,Toshimitsu Katoh 한국식품영양과학회 2009 Journal of medicinal food Vol.12 No.5
We investigated age-related changes in intestinal intraepithelial lymphocyte (IEL) subsets in mice by flow cytometric analysis and their functional preservation as affected by feeding Spirulina, a cyanobacterium that is known to possess various therapeutic effects, including immune modulation activity. The number of cells possessing the leukocyte-common antigen CD45+ cells in mice (43 weeks old) of the aged group, used as a representative marker for IELs, was significantly lower than that of adult mice (5 weeks old). Either the proportion or the number of CD45+CD8+ cells of the aged mice was significantly lower than that of adult mice, corresponding to previous reports. Proportions and numbers of CD4+CD8+ cells in aged mice, on the other hand, were higher than those in adult mice. Increased or decreased levels of the cell surface antigens observed in the aged mice tended to be restored in aged mice fed Spirulina (aged-SP group), which ingested a hot water extract of Spirulina (SpHW). In fact, the proportions of CD45+CD8+ cells and CD45+TCRγδ+ cells in the aged-SP group significantly increased in comparison to the control aged group, which ingested ordinary chow and water ad libitum. These results suggest that ingestion of SpHW in the aged-SP group may contribute to the functional preservation of the intestinal epithelium as a first line of mucosal barrier against infectious agents through retaining the number of certain IELs. Changes in the number of other IEL subsets and blood cells are also discussed.
박동기,Toshimitsu Hayashi,박혜진 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.5
In this study, the immunemodulatory activities of arabinogalactans-type polysaccharide (APS) from Cordyceps militaris grown on germinated soybeans was evaluated in THP-1 human monocytes. The cellular size and the number of intracellular organelles of THP-1monocytes were increased by APS. Also, APS-treated THP-1 cells significantly developed cellular adherence and macrophagic differentiation to the culture plate surface. APS noticeably enhanced phagocytic activity of THP-1cells against IgG-FITC-latex beads. APS induced the level of TNF-α, IL-12 p40, and IL-8 as well as TLR2 and TLR4mRNAs. APS can be developed as a promising immunmodulating agent with macrophage-activating properties.