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Jeong, Sangmin,Lee, Heon,Park, Hyunwoong,Jeon, Ki-Joon,Park, Young-Kwon,Jung, Sang-Chul Elsevier 2018 CATALYSIS TODAY - Vol.307 No.-
<P><B>Abstract</B></P> <P>To use the microwave/ML/TiO<SUB>2</SUB> hybrid system as an advanced treatment of nitrobenzene (NB), a series of experiments were performed to examine the effects of microwave irradiation and auxiliary oxidants. The degradation of NB was carried out using different combinations of five-unit treatment techniques. The NB degradation rate increased with increasing microwave intensity. The circulation fluid velocity, concentration of H<SUB>2</SUB>O<SUB>2</SUB>, and the rate of O<SUB>2</SUB> gas injection showed the highest rate of degradation under optimal conditions. A significant synergistic effect was observed when H<SUB>2</SUB>O<SUB>2</SUB> addition was combined with the microwave/ML/TiO<SUB>2</SUB> hybrid process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The kinetics of NB was studied in a modified TiO<SUB>2</SUB> photocatalytic degradation system. </LI> <LI> The degradation of NB was carried out using different combinations of five-unit process. </LI> <LI> The decomposition rate was determined by the convergence of various elements and techniques. </LI> <LI> A combination of multiple processes remarkably increased the degradation efficiency. </LI> <LI> Two preferred routes were recommended for the photocatalytic degradation pathway. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Effect of liquid phase plasma on photocatalysis of water for hydrogen evolution
Jeong, Sangmin,Chung, Kyong-Hwan,Lee, Heon,Park, Hyunwoong,Jeon, Ki-Joon,Park, Young-Kwon,Jung, Sang-Chul Elsevier 2017 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.42 No.27
<P><B>Abstract</B></P> <P>This study examined the effects of liquid phase plasma irradiation on the photocatalytic decomposition of water for hydrogen evolution. TiO<SUB>2</SUB> and metal-loaded TiO<SUB>2</SUB> nanocrystallites were introduced as photocatalysts. Na-Y zeolite was applied as a support for the TiO<SUB>2</SUB> nanocrystallites. The photocatalytic activities of the photocatalysts were estimated for hydrogen production from water. Hydrogen evolution appeared in the photodecomposition of water without photocatalysts. This was caused by the decomposition of water by plasma irradiation in water directly. The hydrogen evolution efficiency improved with increasing conductivity of water. The rate of hydrogen evolution was increased by the metal loading (Ni, Co, Fe) on the TiO<SUB>2</SUB> surface. Na-Y zeolite can be used as an efficient photocatalytic support for the fixation of TiO<SUB>2</SUB>. The TiO<SUB>2</SUB> nanocrystallites were incorporated above 40 wt% on Na-Y support.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effect of liquid phase plasma irradiation on water photolysis was studied for hydrogen evolution. </LI> <LI> TiO<SUB>2</SUB> and metal-loaded TiO<SUB>2</SUB> nanocrystallites were introduced as photocatalysts. </LI> <LI> Na-Y zeolite was applied as a support for the TiO<SUB>2</SUB> nanocrystallites. </LI> <LI> Hydrogen evolution appeared in the photodecomposition of water without photocatalysts. </LI> <LI> The rate of hydrogen evolution was increased by the metal loading on the TiO<SUB>2</SUB> surface. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Sangmin,Lee, Jeongmin,You, Daeun,Jeong, Yisun,Jeon, Myeongjin,Yu, Jonghan,Kim, Seok Won,Nam, Seok Jin,Lee, Jeong Eon S. KARGER AG 2018 CELLULAR PHYSIOLOGY AND BIOCHEMISTRY Vol.45 No.2
<P><B><I>Background/Aims:</I></B> Transforming growth factor-beta proteins (TGF-βs) are multifunctional growth factors and powerful modulators of the epithelial-mesenchymal transition (EMT) in a variety of cancer types including breast and lung cancer cells. Here, we demonstrated the inhibitory effect of berberine (BBR) on tumor growth and metastasis of triple negative breast cancer (TNBC) cells via suppression of TGF-β1 expression. <B><I>Methods:</I></B> The levels of mRNA expression were analyzed by real-time PCR. The levels of MMP-2, MMP-9 and TGF-β1 protein expression were analyzed by zymography and confocal microscopy, respectively. Cell migration was analyzed by wound healing assay. Tumorigenicity of TNBC cells such as tumor growth and metastasis was analyzed using xenograft models. <B><I>Results:</I></B> In a clinical data set, aberrant TGF-β1 expression was associated with poor prognosis of breast cancer patients. Our <I>in vitro</I> results using TNBC cells showed that the expression levels of matrix metalloproteinase (MMP)-2 and MMP-9 and the capacity for cell migration were increased by TGF-β1 treatment. In contrast, basal levels of MMP-2 and MMP-9 were suppressed by a specific TGF-β receptor I inhibitor, SB431542. In addition, TGF-β1–induced MMP-2 and MMP-9 expression and cell migration were decreased by SB431542. Interestingly, we showed for the first time that BBR decreased the level of TGF-β1, but not TGF-β2, in TNBC cells. Furthermore, BBR significantly decreased the level of MMP-2 expression as well as the capacity for cell migration in TNBC cells. Finally, we examined the effect of BBR on <I>in vivo</I> tumor growth and lung metastasis in MDA-MB231 and 4T1 breast cancer xenograft models and showed that both were significantly decreased following BBR treatment. <B><I>Conclusion:</I></B> BBR suppresses tumorigenicity of TNBC cells through inhibition of TGF-β1 expression. Therefore, we demonstrate that BBR could be a promising drug for treatment of TNBC.</P>
정상민(Sangmin Jeong),위경수(Kyoung-Soo We),이창건(Chang-Gun Lee) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.2A
CPS는 사람의 안전과 편의와 밀접한 관련이 있는 시스템이 주를 이루기 때문에 시스템의 신뢰성이 매우 중요하다. 때문에 신뢰성을 보장하는 것이 중요한데 기존의 신뢰성 보장 기법은 추가적인 하드웨어 자원 할당을 필요로 하기 때문에 자원의 과이용이 생기게 된다. 본 논문에서는 평소에는 추가적인 하드웨어 자원 할당없이 오류가 발생했을 경우에만 진입 제어를 통해 추가적인 하드웨어 자원을 할당하는 소프트웨어 콤포넌트 진입 제어 기법을 제안한다.
Kim, Sangmin,You, Daeun,Jeong, Yisun,Yu, Jonghan,Kim, Seok Won,Nam, Seok Jin,Lee, Jeong Eon Elsevier 2018 Phytomedicine Vol.50 No.-
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Interleukin-8 (IL-8) expression is associated with metastasis in a variety of cancer cells.</P> <P><B>Purpose</B></P> <P>Here, we investigated the regulatory mechanism of IL-8 expression as well as the pharmacological effect of berberine (BBR) on IL-8 expression in triple-negative breast cancer (TNBC) cells.</P> <P><B>Methods</B></P> <P>The clinical value of IL-8 was analyzed by from a public database [Kaplan‑Meier plotter database. IL-8 mRNA and protein expression was analyzed by real-time PCR and ELISA, respectively. Cell invasion was analyzed by Boyden chamber assay. Tumor cell growth was analyzed by colony forming assay.</P> <P><B>Results</B></P> <P>Clinically, we observed that breast cancer patients with highly expressed IL-8 are associated with poor outcomes in areas such as relapse-free, overall, and distant metastasis-free survival. We showed that IL-8 expression is higher in TNBC cells than in non-TNBC cells. In addition, the rates of cell invasion were significantly increased by IL-8 treatment. These IL-8 levels were decreased by EGFR (Neratinib and Afatinib) and MEK (PD98059) inhibitors in TNBC cells. Finally, we observed that BBR dramatically suppresses IL-8 expression. In addition, BBR also inhibited cell invasiveness and anchorage-independent growth. Interestingly, our results showed that BBR down-regulates EGFR protein expression and dose-dependently inhibits MEK and ERK phosphorylation.</P> <P><B>Conclusion</B></P> <P>Here, we demonstrate that BBR may be a promising drug to suppress cell invasiveness and growth of TNBC through IL-8-related mechanisms.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Sangmin,Jeong, Hyeongseop,Lee, Ju Huck,Chung, Jeong Min,Kim, Rumi,Yun, Hyung Joong,Won, Jonghan,Jung, Hyun Suk Elsevier 2017 Biochemical and biophysical research communication Vol.489 No.2
<P><B>Abstract</B></P> <P>Alkyl hydroperoxide reductase E (AhpE) is a member of the peroxidase family of enzymes that catalyse the reduction of peroxides, however its structural and functional roles are still unclear in details. In this study, we used the <I>Thermococcus kodakarensis</I> AhpE-like protein as a model to investigate structure–function relationships including the molecular properties of DNA binding activity. Multiple sequence alignment, structural comparison and biochemical analyses revealed that TkAhpE includes conserved peroxidase residues in the active site, and exhibits peroxidase activity with structure-dependent holdase chaperone function. Following electrophoretic mobility shift assays and electron microscopy analysis demonstrated distinctive binding features of TkAhpE to the DNA showing that their dimeric conformer can bind to the double-stranded DNA, but not to the single-stranded DNA, indicating its striking molecular features to double-stranded DNA-specific interactions. Based on our results, we provided that TkAhpE is a multifunctional peroxidase displaying structure-dependent molecular chaperone and DNA binding activities.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Alkyl hydroperoxide reductase E acts as a multi-functional protein displaying peroxidase, holdase and DNA binding activities. </LI> <LI> Thermococcus kodakarensis AhpE(TkAhpE) exhibits peroxidase activities with structure-dependent holdase chaperone function. </LI> <LI> Recombinant TkAhpE is expressed as two different oligomeric forms, the dimeric and octameric conformers. </LI> <LI> Unlikely an octameric conformer, dimeric state of TkAhpE can bind both double stranded circular and linear DNA molecules. </LI> </UL> </P>