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RISS 인기검색어
- 검색키워드
- 저자 : Fumihiko Itoh (검색결과 2 건)
- 무료
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- 유료
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Observation of Domain Wall Structures in Triglycine Sulfate by Using Scanning Probe Microscopy
Makoto Iwata,Fumihiko Itoh,Takuma Morishita,Rintaro Aoyagi,Masaki Maeda,Yoshihiro Ishibashi 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
The 180˚ domain wall structure on the (010) cleavage plane in triglycine sulfate (TGS) was investigated using scanning probe microscopy (SPM). We found that a step pattern with an interval of one half the lattice constant b appeared on the cleavage plane. Using friction force microscopy (FFM), the contrast of the friction image was found to be composed of two friction values in the step pattern, implying that the friction image shows an 180± domain wall structure. We also con¯rmed that the lenticular domain wall structure in TGS could be observed in the quenched sample by using FFM. The 180˚ domain wall structure on the (010) cleavage plane in triglycine sulfate (TGS) was investigated using scanning probe microscopy (SPM). We found that a step pattern with an interval of one half the lattice constant b appeared on the cleavage plane. Using friction force microscopy (FFM), the contrast of the friction image was found to be composed of two friction values in the step pattern, implying that the friction image shows an 180± domain wall structure. We also con¯rmed that the lenticular domain wall structure in TGS could be observed in the quenched sample by using FFM.
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Inhibitory Effect of Myrica Bark on Lipase Activity in Mouse Plasma and Gastrointestinal Tract
Kyoko Kobayashi,Satomi Ihara,Ayumi Kobata,Kana Itoh,Nae Kusunoki,Fumihiko Yoshizaki 한국식품영양과학회 2008 Journal of medicinal food Vol.11 No.2
As the methanol extract of Myricabark inhibited the activity of lipase in isolated mouse plasma in vitro, theinfluence of the extract on this enzyme in the gastrointestinal tube was investigated after oral intake. The methanol extractdepressed the elevation of blood triglyceride level in olive oil-fed mice. Myricetin and gallic acid were suspected to be re-sponsible for the inhibition of the lipase activity in isolated mouse plasma in vitro. The contents of myricetin and gallic acidin the methanol extract seemed to be insufficient for the appearance of the depressive activity of the extract on lipase in thegastrointestinal tract in vivo. Myricitrin, which is present in abundance in the methanol extract (about 61%), did not show theinhibitory activity. However, this material suppressed the elevation of blood triglyceride level to a slightly smaller extent com-pared with the methanol extract by oral administration. Consequently, it was proposed that myricitrin may function as a pro-drug, which reveals its activity after conversion to myricetin, the active substance, by enterobacilli in the gastrointestinal tract.
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