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Jekal, Soyoung,Kwon, Oryong,Hong, Soon Cheol,Lee, Jae Il American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.3
<P>A bulk d(0) NaN of rocksalt or zinc-blende structure was predicted to be a ferromagnetic half metal and furthermore the half-metallicity would be retained in thin films. Such half metallicity of d(0) ferromagnetic NaN is attractive for possible application in a spintronics device, such as a spin transfer torque magnetic random access memory. In this study, we carried out first-principles calculations on magnetocrystalline anisotropy rocksalt structured NaN thin films with different thicknesses, using Vienna Ab-initio Simulation Package code. It was found that the NaN(001) thin films have perpendicular magnetization with quite low magnetocrystalline anisotropy energies of order of 10 mu eV, but capping of a 5d-transition metal Ta monolayer over the NaN(001) thin films enhances the perpendicular magnetocrystalline anisotropy energies significantly, more than 10 times. Furthermore, the 1(Ta)/NaN(001) systems retain their half-metallicity except the NaN layer just below Ta.</P>
Jekal, Seung-Joo,Lee, Jae-Hyoung,Park, Seung-Teack 대한임상검사과학회 2012 대한임상검사과학회지(KJCLS) Vol.44 No.4
Cyclooxygenase(COX-2) is an inducible enzyme that catalyzes the synthesis of prostaglandins (PGs) from arachidonic acid. Over-expression of COX-2 has been reported to be associated with progressive hepatic fibrosis in chronic hepatic C infection and rat liver fibrosis induced by carbon tetrachloride($CCl_4$). Recently, it is well known that mast cell products can stimulate the proliferation of hepatic stellate cells and key players in liver fibrosis. But little is known regarding their role in $CCl_4$-induced liver fibrosis in rat. Our aim was to investigate the relation between COX-2 expression and mast cells during liver fibrosis after $CCl_4$ treatment. Thirty Wistar rats were divided into five groups (non-treated 0, 2, 4, 6 and 8-week after $CCl_4$-treatment). Reverse transcription polymerase chain reaction (RT-PCR) and immunohistochemistry were used to assess the expression of ${\alpha}$-smooth muscle actin (${\alpha}$-SMA), collagen-1 and COX-2 in liver tissue from $CCl_4$-treated rats. The density of collagen and mast cells were determined using a computerized image analysis system in liver sections stained with picrosirius red and toluidine blue, respectively. The expression levels of ${\alpha}$-SMA, collagen-1 and COX-2 mRNA were significantly higher at 2 wk in $CCl_4$-treated groups than non-treated group. The number of mast cells in liver tissues increased gradually from 2 wk to 6 wk depending on the fibrosis severity but decreased abruptly at 8 wk. The significant increase of collagen-1 and ${\alpha}$-SMA mRNA expression in $CCl_4$-treated rats was continued until 6 wk while the COX-2 mRNA was significantly decreased at 8 wk. These results suggest that increased mast cells are closely associated with COX-2 over-expression during hepatic fibrogenesis of $CCl_4$-treated rats.
Magnetism of Asymmetrically Terminated FeRh(001) Thin Films: A First-Principle Study
Jekal, Soyoung,Rhim, S. H.,Hong, S. C. IEEE 2016 IEEE transactions on magnetics Vol.52 No.7
<P>Rh-terminated FeRh(001) film is known to be stable in a ferromagnetic (FM) state different from a G-type antiferromagnetic (G-AFM) bulk ground state, while an Fe-terminated FeRh(001) film has the same ground state as the bulk. In this paper, we investigate the magnetic properties of asymmetrically terminated FeRh(001) films: one surface is Fe-terminated and the other is Rh-terminated. We found that the films thicker than eight monolayers (MLs) have more or less complicated magnetic configuration: the topmost three layers from the Rh-terminated surface are FM while the rest are G-AFM. In particular, the magnetic configuration of the 8-ML FeRh(001) film has lower energy than the whole-layer G-AFM and FM states by 10.2 and 0.2 meV/Fe, respectively. The magnetic configuration of the asymmetrically terminated films is explained by the magnetic energy gain due to the magnetization of the Rh atoms.</P>
도은염색법중(鍍銀染色法中) Slide 부착법(附着法)과 절편부유법(切片浮遊法)의 비교고찰(比較考察)
제갈승주 ( Jekal Seung Joo ),오근영 ( Keun Young Oh ) 대한임상검사과학회 1979 대한임상검사과학회지(KJCLS) Vol.11 No.1
Two kinds of silver impregnation methods are most widely used in routine histopathological laboratory. that is frozen section which requires careful handling, and processing and produces inconstant result and uncomfortable procedure, in addition the section is easily or frequently detached from the slide due to high alkalinity of silver particles. This may be overcome by carrying out steps of the procedure . by floating the paraffin section on the solutions. The procedure shows simple and no detachment from the slide, also it can get a clear background by deparaffinization.