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Polyakov, A. Y.,Jang, Lee-Woon,Smirnov, N. B.,Govorkov, A. V.,Kozhukhova, E. A.,Yugova, T. G.,Reznik, V. Y.,Pearton, S. J.,Baik, Kwang Hyeon,Hwang, Sung-Min,Jung, Sukkoo,Lee, In-Hwan American Institute of Physics 2011 JOURNAL OF APPLIED PHYSICS - Vol.110 No.9
<P>The electrical properties, presence of deep electron and hole traps and photoluminescence spectra were measured for undoped a-GaN films grown by metal-organic chemical vapor deposition (MOCVD) in a two-stage process using a high V/III ratio at the first stage and low V/III ratio at the second stage. Growth was performed on r-sapphire substrates with a high temperature GaN nucleation layer. The films showed a full width at half maximum of 450-470 arcseconds for the (11-20) x-ray rocking curve with little anisotropy with respect to the sample rotation around the growth direction. The stacking fault (SF) density determined by selective etching was similar to 5 x 10(4) cm(-1). The residual donor concentration was 10(14)-10(15) cm(-3), with a very low density (2.5 x 10(13) cm(-3)) of electron traps located at E-c - 0.6 eV, which are believed to be one of the major non-radiative recombination centers in nonpolar GaN. Consequently, the films showed a high intensity of bandedge luminescence with negligible contribution from defect bands associated with SFs. In contrast to previously studied nonpolar GaN films, the a-GaN layers showed a high concentration of gallium-vacancy-related acceptors near E-v + 1 eV and a strong yellow luminescence band, both indicating that growth conditions were effectively N-rich. a-AlGaN/GaN heterojunctions with thin heavily Si doped AlGaN barriers made on a-GaN substrates showed two-dimensional electron gas (2DEG) concentrations of 1.2 x 10(13) cm(-3), with 2DEG mobility of 80 cm(2)/Vs. Capacitance-voltage profiling of Schottky diodes on these HJs suggest that the 2DEG is fully depleted by the built-in voltage of the Schottky diode. (C)2011 American Institute of Physics. [doi: 10.1063/1.3658026]</P>
Hwang, Kyu Ri,Choi, Young Min,Kim, Jin Ju,Lee, Sung Ki,Yang, Kwang Moon,Paik, Eun Chan,Jeong, Hyeon Jeong,Jun, Jong Kwan,Yoon, Sang Ho,Hong, Min A KOREAN ACADEMY OF MEDICAL SCIENCE 2017 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.32 No.12
<P>The balance between coagulation and fibrinolysis is an essential part in early pregnancy. Mutations in methylenetetrahydrofolate reductase (<I>MTHFR</I>) gene lead to decreased activity of the enzyme and hyperhomocysteinemia, which then induces platelet aggregation by promoting endothelial oxidative damage, possibly resulting in adverse effect on maintenance of pregnancy. We investigated the role of <I>MTHFR</I> single nucleotide polymorphisms (SNPs), C677T and A1298C, in Korean patients with recurrent pregnancy loss (RPL). We conducted a prospective case-control study in the Korean population. Subjects included 302 women with 2 or more consecutive, unexplained, spontaneous miscarriages before 20 weeks of gestation and 315 control women without a history of recurrent miscarriages. The genotyping for C677T and A1298C polymorphisms was performed using the TaqMan assay. Continuous variables were compared using Student's t-test, and χ<SUP>2</SUP> test was used to evaluate differences in the genotype distributions between the RPL and the controls. The genotype distribution of both polymorphisms in the RPL group did not differ from those of the controls. For further analysis, if RPL patients were divided according to the numbers of pregnancy losses (≥ 2 and ≥ 3) neither group was significantly different compared with controls. <I>MTHFR</I> gene C677T and A1298C polymorphisms are not associated with idiopathic RPL in Korean women, suggesting that those may not be susceptible allelic variants or be deficient to cause RPL.</P>
흉부 방사선 치료후 완전방실차단증과 양측 관동맥구 협착증을 보인 1예
고경환,김정경,이수금,윤재형,조성제,이상훈,홍석근,현민수,황흥곤,김명아,박성훈 대한내과학회 1997 대한내과학회지 Vol.53 No.3S
We have experienced a case of radiation-induced coronary biostial stenosis presented with recurrent syncopal attack, which was confirmed by coronary angiography and pathologic findings. A 60 year-old woman was admitted with the symptoms of recurrent syncopal attack. She had a history of radiation therapy of the chest for lung neoplasm 15 years ago. Initial electrocardiogram showed transient high-degree A-V block followed by third-degree atrioventricular block which was associated with syncope. Echocardiography revealed mild aortic regurgitation without left ventricular dysfunction. The coronary angiogram revealed biostial stenosis of coronary arteries. Initial cardiac symptom subsided after temporary pacemaker implantation. She had a coronary bypass graft surgery on both coronary arteries using saphenous vein. Biopsy findings showed mild fibrosis with intimal thickening of coronary artery.
Min Sik Kim,Dong Hyun Lee,Yu Rim Lee,Dong Kyun Kim,Suk Hyang Bae,Jin Yeon Hwang,Kyung A Kwon,이수이,한진영,김기욱,김성현 대한혈액학회 2010 Blood Research Vol.45 No.1
Imatinib mesylate (IM) is used to treat a wide range of diseases, including Philadelphia chromosome-positive chronic myeloid leukemia (CML), on account of its high tolerability and low incidence of minor adverse events. Hemorrhage is thought to be a rare complication of IM. Recently, IM has been associated with reduced a2-plasmin inhibitor and platelet dysfunction. We report here the case of a 33-year-old female patient with CML who experienced subdural hematoma after an incremental increase in IM dosage due to a loss of complete molecular response. This case indicates that physicians should be alert to this atypical cause of headache in patients taking high-dose IM.
적외선등을 이용한 실외 실험적 온난화 처리에 따른 소나무와 전나무의 종자 발아 및 유묘 생존율
조민석 ( Min Seok Cho ),황재홍 ( Jae Hong Hwang ),양아람 ( A Ram Yang ),한새롬 ( Sae Rom Han ),손요환 ( Yo Whan Son ) 한국임학회 2014 한국산림과학회지 Vol.103 No.2
본 연구는 지구 온난화와 관련한 대응 대책 마련을 위해서 대기 온도 상승에 따른 주요 침엽수의 종자 발아 및 발아 후 유묘의 생존율 변화를 알아보고자 수행하였다. 소나무와 전나무를 대상으로 적외선등을 이용하여 대조구보다 온난화 처리구의 대기 온도를 3oC 높게 유지하는 실외 실험적 온난화 처리를 실시하였다. 온난화 처리에 따른 대기 온도 상승으로 두 수종 모두 발아율이 높아지는 경향을 보였지만, 전나무에서만 유의적 차이가 나타났다. 소나무와 전나무 두 수종 모두 온난화 처리구가 대조구보다 평균발아일수는 유의적으로 감소하였으며, 온난화 처리구에서 높은 발아속도와 발아세를 보였다. 온도 상승과 토양 수분 감소에 따라 전나무 유묘의 고사율은 증가하였지만, 소나무는 온난화 처리에 따른 차이를 보이지 않았다. 향후, 지구 온난화에 따른 대기와 토양 온도 상승 및 토양 수분감소로 양묘과정에서 종자 발아 및 유묘 생존율의 변화가 예상되기 때문에 지구 온난화에 대응할 수 있는 양묘기술개선이 필요할 것으로 판단된다. The purpose of this study was to investigate the effect of experimental warming using infrared lamps on seed germination and seedling survival rate of Pinus densiflora and Abies holophylla. The air temperature of warmed plots had been automatically maintained 3 higher than control plots. The percent germinations (%) of the two coniferous species were higher in warmed plots than in control plots, however a significant difference appeared only in A. holophylla. In addition, P. densiflora and A. holophylla showed the shorter mean germination time (days), higher germination rate (seed·day-1) and germination energy (%) in warmed plots than in control plots. A. holophylla showed a higher seedling mortality rate in the warmed plots than in control plots because of increased air and soil temperatures and decreased soil moisture. However, seedling survival rate of P. densiflora showed no significant difference by experimental warming. In the future, changed air and soil temperatures and soil moisture due to global warming will induce a variety of changes in seed germination and survival rate of tree species in nursery culture. Therefore, it is necessary to establish adaptation strategies that improve techniques in nursery culture against global warming.
Deep traps and enhanced photoluminescence efficiency in nonpolar a-GaN/InGaN quantum well structures
Polyakov, A. Y.,Jang, Lee-Woon,Jo, Dong-Seob,Lee, In-Hwan,Smirnov, N. B.,Govorkov, A. V.,Kozhukhova, E. A.,Hyeon Baik, Kwang,Hwang, Sung-Min American Institute of Physics 2012 JOURNAL OF APPLIED PHYSICS - Vol.111 No.3
Heo, Jae-Rim,Kim, Soo-Min,Hwang, Kyung-A,Kang, Ji-Houn,Choi, Kyung-Chul D.A. Spandidos 2018 International journal of molecular medicine Vol.42 No.3
<P>Resveratrol, a dietary product present in grapes, vegetables and berries, regulates several signaling pathways that control cell division, cell growth, apoptosis and metastasis. Malignant melanoma proliferates more readily in comparison with any other types of skin cancer. In the present study, the anti-cancer effect of resveratrol on melanoma cell proliferation was evaluated. Treating A375SM cells with resveratrol resulted in a decrease in cell growth. The alteration in the levels of cell cycle-associated proteins was also examined by western blot analysis. Treatment with resveratrol was observed to increase the gene expression levels of p21 and p27, as well as decrease the gene expression of cyclin B. In addition, the generation of reactive oxygen species (ROS) and endoplasmic reticulum (ER) stress were confirmed at the cellular and protein levels using a 2′,7′-dichlorofluorescein diacetate assay, TUNEL assay and western blot analysis. Resveratrol induced the ROS-p38-p53 pathway by increasing the gene expression of phosphorylated p38 mitogen-activated protein kinase, while it induced the p53 and ER stress pathway by increasing the gene expression levels of phosphorylated eukaryotic initiation factor 2α and C/EBP homologous protein. The enhanced ROS-p38-p53 and ER stress pathways promoted apoptosis by downregulating B-cell lymphoma-2 (Bcl-2) expression and upregulating Bcl-2-associated X protein expression. In conclusion, resveratrol appears to be an inducer of ROS generation and ER stress, and may be responsible for growth inhibition and cell cycle arrest of A375SM melanoma cells.</P>
Alteration of The Quaternary Structure of Human UDP-Glucose Dehydrogenase by a Double Mutation
Huh, Jae-Wan,Yang, Seung-Ju,Hwang, Eun-Young,Choi, Myung-Min,Lee, Hyun-Ju,Kim, Eun-A,Choi, Soo-Young,Choi, Jene,Hong, Hea-Nam,Cho, Sung-Woo Korean Society for Biochemistry and Molecular Biol 2007 Journal of biochemistry and molecular biology Vol.40 No.5
There are conflicting views for the polymerization process of human UDP-glucose dehydrogenase (UGDH) and no clear evidence has been reported yet. Based on crystal coordinates for Streptococcus pyogenes UGDH, we made double mutant A222Q/S233G. The double mutagenesis had no effects on expression, stability, and secondary structure. Interestingly, A222Q/S233G was a dimeric form and showed an UGDH activity, although it showed increased $K_m$ values for substrates. These results suggest that Ala222 and Ser233 play an important role in maintaining the hexameric structure and the reduced binding affinities for substrates are attributable to its altered subunit communication although quaternary structure may not be critical for catalysis.
Hwang, Kyung-A,Kang, Nam-Hee,Yi, Bo-Rim,Lee, Hye-Rim,Park, Min-Ah,Choi, Kyung-Chul Lychnia 2013 International journal of oncology Vol.42 No.2
<P>An endocrine disrupting chemical (EDC) is a global health concern. In this study, we examined the effects of genistein (GEN) on bisphenol A (BPA) or 17β-estradiol (E2)-induced cell growth and gene alterations of BG-1 ovarian cancer cells expressing estrogen receptors (ERs). In an in vitro cell viability assay, E2 or BPA significantly increased the growth of BG-1 cells. This increased proliferative activity was reversed by treatment with ICI?182,780, a well-known ER antagonist, while cell proliferation was further promoted in the presence of propyl pyrazole triol (PPT), an ERα agonist. These results imply that cell proliferation increased by E2 or BPA was mediated by ERs, particularly ERα. BPA clearly acted as a xenoestrogen in BG-1 ovarian cancer cells by mimicking E2 action. In contrast, GEN effectively suppressed BG-1 cell proliferation promoted by E2 or BPA by inhibiting cell cycle progression. E2 and BPA increased the expression of cyclin D1, a factor responsible for the G1/S cell cycle transition. They also decreased the expression of p21, a potent cyclin-dependent kinase (CDK) inhibitor that arrests the cell cycle in G1 phase, and promoted the proliferation of BG-1 cells. As shown by its repressive effect on cell growth, GEN decreased the expression of cyclin D1 augmented by E2 or BPA. On the other hand, GEN increased the p21 expression downregulated by E2 or BPA. Collectively, our findings suggest that GEN, a dietary phytoestrogen, has an inhibitory effect on the growth of estrogen-dependent cancers promoted by E2 or BPA.</P>