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Raman Spectra of Proton Ordered XI phase Ice crystal
Kohji Abe,Kohji Nakano,Takao Miasa,Yuya Ohtake 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Eects of an external electric feld on Raman spectra were studied in oxygen-isotope-substitutedSrTi18O3 (STO18). Signifcant frequency shifts and an increase of the intensities were observed above and below the ferroelectric transition temperature Tc = 23 K. Despite the clear difference in normal Raman spectra at low temperatures, the effect of an electric feld on the ferroelectric soft mode is similar to that for STO16, suggesting that in STO18 the soft mode remains very sensitive to the electric feld.
Kohji Yamaki,Herath Mudiyanselage Theja Herath,Yuko Takano-Ishikawa 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.4
Certain naturally occurring flavonoids affect immunoregulatory activities in vitroand in vivoagainst cytokineproduction. Since tumor necrosis factor (TNF)-a is one of the major inflammatory cytokines, the effects of various dietaryflavonoids on TNF-a production in lipopolysaccharide (LPS)-stimulated J774.1 cells were evaluated in vitro. Flavones,flavonols, and chalcone are the most potent inhibitors of production of TNF-a. Flavanone, naringenin, anthocyanidin, pelargo-din, and cyanidin exhibit moderate inhibitory activity. In contrast, genistein isoflavone displays weak inhibition, while eri-odictyol flavanone is inactive. It is clear that the double bond between carbons 2 and 3 and the ketone group at position 4 offlavonoids are necessary for potent inhibitory effect. The difference in inhibitory action appears to depend on the categorizedsubclass of flavonoids.