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Hot Isostatic Pressing of Nanostructured γ - TiAl Powders
HEBEISEN, J,TYLUS, P,ZICK, D,MUKHOPADHYAY, D K,BRAND, K,SURYANARAYANA. C,FROES. F H 대한금속재료학회(대한금속학회) 1996 METALS AND MATERIALS International Vol.2 No.2
A study of the hot isostatic pressing (HIP'ing) of γ-TiAl powders produced by mechanical alloying, has demonstrated that full density can be achieved 400℃ or more below the temperature required for conventional powder; that is 725℃ or below. Nanostructured grains (≤100 ㎚) are observed after HIP'ing up to 850℃.
Flavonoids의 약리작용(V) - 전기자극 및 과민반응으로 유발된 흰쥐 회장의 평활근수축에서 Flavones 및 Flavonols의 진경효과 -
안홍직,이지윤,김수정,김정민,박주현,박성훈,심상수,김창종,Ahn, Hong-Zick,Lee, Ji-Yun,Kim, Soo-Jeong,Kim, Jung-Min,Park, Ju-Hyun,Park, Sung-Hun,Sim, Sang-Soo,Kim, Chang-Jong 대한약학회 2007 약학회지 Vol.51 No.2
Some flavonoids have spasmolytic activities in various smooth muscles, but structure-activity relationships on their spasmolytic activity and its mechanism are unclear. In this study, effects of flavones (flavone and apigenin) and flavonols (quercetin and rutin) on the rat ileal smooth muscle contraction were studied in vitro and in vitro. In the electric stimulation-induced contraction, all of four flavonoids inhibited concentration-dependently the rat ileal smooth muscle contraction induced by electric stimulation (10 mV, 0.1 cps, 0.1 msec duration), IC$_{50}$ of quercetin, apigenin, flavone and rutin were 0.98${\times}$10$^{-5}$, 1.20${\times}$10$^{-5}$, 1.55${\times}$10$^{-5}$ and 1.85${\times}$10$^{-5}$ M, respectively. Flavonoids at a concentration of 2${\times}$10$^{-5}$ M also significantly inhibited the anaphylactic contraction and decreased concentration-dependently the mast cell degranulation by anaphylactic reaction, IC$_{50}$ of quercetin, apigenin, flavone and rutin were 4.0${\times}$10$^{-5}$, 7.5${\times}$10$^{-5}$, 8.0${\times}$10$^{-5}$ and 9.5${\times}$10$^{-5}$ M, respectively. These results indicated that flavones and flavonols inhibited the rat ileal smooth muscle contraction induced by electric stimulation because of their antagonism against acetylcholine and have spasmolytic activities on anaphylactic contraction which may be due to their mast cell-stabilizing activities. Furthermore, double bond of C$_{2,3}$ in benzene ring of flavonoids may be important in the their antispasmodic activities on the rat ileal smooth muscle contraction induced by electric stimulation and anaphylactic reaction.