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Properties of IZTO Thin Films on Glass with Different Thickness of SiO2 Buffer Layer
박종찬,강성준,윤영섭 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.4
The properties of the IZTO thin films on the glass were studied with a variation of the SiO2 buffer layer thickness. SiO2 buffer layers were deposited by plasma-enhanced chemical vapor deposition (PECVD) on the glass, and the In-Zn-Tin-Oxide (IZTO) thin films were deposited on the buffer layer by RF magnetron sputtering. All the IZTO thin films with the SiO2 buffer layer are shown to be amorphous. Optimum SiO2 buffer layer thickness was obtained through analyzing the structural, morphological, electrical, and optical properties of the IZTO thin films. As a result, the IZTO surface roughness is 0.273 nm with a sheet resistance of 25.32 Ω/sq and the average transmittance is 82.51% in the visible region, at a SiO2 buffer layer thickness of 40 nm. The result indicates that the uniformity of surface and the properties of the IZTO thin film on the glass were improved by employing the SiO2 buffer layer and the IZTO thin film can be applied well to the transparent conductive oxide for display devices.
목향(木香)함유 DHL과 ML이 간세포 보호에 미치는 영향
박종찬,윤용갑,Park, Jong-Chan,Yun, Young-Gab 대한한의학방제학회 2008 大韓韓醫學方劑學會誌 Vol.16 No.2
Dehydrocostus lactone (DHL) and Mokko lactone (ML) were isolated from Saussureae Radix, and their effects on heme oxygenase-1 (HO-1) expression and hepatoprotection in the liver cell line HepG2 were investigated. DHL induced HO-1 expression and HO activity in a dose-dependent manner, whereas ML lacking one double bond property at 11 and 13 carbons on its own chemical structure had no apparent effects. DHL also induced Nrf2 nuclear translocation and enhanced antioxidant response element (ARE) activation which mediated HO-1 gene transcription. Pretreatment with DHL protected HepG2 cells against oxidative damages caused by H2O2. Interestingly, the hepatoprotective effects of DHL appeared to be associated with HO enzymatic activation, HO-1 expression and Nrf2 activation, because blockage of HO activity by a HO inhibitor and inhibition of HO-1 and Nrf2 cellular synthesis by small interfering RNA abolished heptoprotection afforded by DHL. Taken together, this investigation provides evidence supporting that Saussureae Radix is hepatoprotective against oxidative stress that causes abnormal liver damages.