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Positional and morphologic changes of the temporomandibular joint disc using
Ahn, Hyoun-Suk,Cho, Su-Beom,Koh, Kwang-Joon 大韓口腔顎顔面 放射線學會 2001 Imaging Science in Dentistry Vol.31 No.4
Purpose : To evaluate displacement nd morphologic changes of the temporomandibular joint (TMJ) disc in patient with internal derangement using magnetic resonance imaging (MRI). Materials and Methods : One hundred and forty five MR images of TMJs in 73 patients were evaluated. Positional and morphologic changes of the TMJ discs were assessed. Lateral or medial disc displacement was also evaluated on coronal images. Results : Among 63 discs with anterior disc displacement, 37 discs were assessed as a biconcave disc and 21 as a deformed disc. Rotational disc displacement was observed in 35 discs. Anteromedial disc displacement was observed in 29 discs, and anterolateral direction in 6 discs. Among 35 rotational displacement, 5 biconcave discs and 21 deformed discs were observed. Conclusion : Rotational and sideways displacement of TMJ discs were found to be common and an important aspect of internal derangement. This study also suggests that sagittal and coronal images of the TMJ have complementary abilities for an assessment of joint abnormality. (Korean J Oral Maxillofac Radiol 2001; 31 : 235-40)
Heat Shock Protein Expression in Endotoxin Treated Renal Epithelial Cells
Park, Jee-Hyoun,Oh, Dong-Jin,Yu, Soo Jeong,Lee,Tae-Woo,Kim, Cha-Hyun,Cho, Jae-Young,Yu, Suk-Hee,Kang, Eung-Taek 중앙대학교 의과대학 의과학연구소 2002 中央醫大誌 Vol.27 No.3-4
Recent studies have reported that markedly increased concentrations of a number of different classes of protein are initially identified by the marked increase in their concentration in cells after various stresses including heat shock. In this study, putative interactions between apoptosis and heat-shock proteins disturbed by endotoxin as aseptic shock model were investigated. The direct cellular damages were assessed by the LDH release from the cytoplasm of the human tubular epithelial cells(HK-2 cells) after lipopolysaccharides(LPS) treatment. And the expressions of Bcl2 and BAX mRNA that had been employed as an index of apoptosis to assess by what extent apoptosis contributed to tubular cell damage and the expression of heat shock protein(HSP)90, 72 and 27 with the Bcl2/BAX ratio in septic shock model were studied also. LPS treatment let HK-2 cells release SDH markely(14.33+/-1.55 vs. 61.00+/- 2.65, p<0.01). LDH release was greater significantly from the cells that had not been heat preconditioned than that of heat preconditioned(61.00+/- 2.65vs. 41.33 +/- 3.21,p<0.05) LPS treatment itself did not up-regulated Bcl2 significantly. But the expression of Bcl2 was marked with heat preconditioning. The expression of BAX was increased with LPS treatment but did not increase significantly with heat preconditioning(165% vs. 1496%). We did not see any contribution of heat preconditioning on the expression of HSP90. HSP72 expression was slightly increased with LPS treatment. But the expression of HSP27 was more evident after preconditioning with LPS treatment HSP27 expression was evident after LPS treatment. This study showed that the heat preconditioning was able to provide protection on the human tubular epithlial cells from LPS treatment extensively. The protection from cytolytic damage and increase of Bcl2/BAX ratio was closely related with the increase of HSP72 and HSP27, especially with LPS treatment.
Ga-doped ZnO nanorod arrays grown by thermal evaporation and their electrical behavior
Ahn, Cheol Hyoun,Han, Won Suk,Kong, Bo Hyun,Cho, Hyung Koun IOP Pub 2009 Nanotechnology Vol.20 No.1
<P>Vertically well-aligned Ga-doped ZnO nanorods with different Ga content were grown by thermal evaporation on a ZnO template. The Ga-doped ZnO nanorods synthesized with 50 wt% Ga with respect to the Zn content showed minimum compressive stress relative to the ZnO template, which led to a rapid growth rate along the <I>c</I>-axis due to the rapid release of stored strain energy. A further increase in the Ga content improved the conductivity of the nanorods due to the substitutional incorporation of Ga atoms in the Zn sites based on a decrease in lattice spacing. A p–n diode structure with Ga-doped ZnO nanorods as an n-type layer displayed a distinct white light luminescence from the side view of the device, showing weak ultraviolet and various deep-level emissions. </P>