http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이기환,김영유,두영뢰,우배매 公州大學校 基礎科學硏究所 1998 自然科學硏究 Vol.7 No.-
The photoluminescence (PL) spectra from p-type a-porous silicon carbides prepared under UV photo-assisted process and under dark-current condition are investigated in detail. Emission bands with peak energies of 2.35, 2.50, 2.70, and 3.43 are resolved. The PL stability in tune and the PL difference arising from different tuning excitation energies are studied. It is found that the PL spectra of the a-porous silicon carbide depend strongly on the preparation conditions for electrochemical etching. The PL spectrum of the sample prepared under photo-assisted process has an enhancement on the lower-energy side of the emission; on the contray, another one under dark-current condition has an enhancement at the higher energy side, and the former stability is better than the latter one, and the latter PL intensity decreases with the increase of the time in the air. The reasons about these differences are discussed.
Jin, Yong-Mei,Won, So-Youn,Jeon, Hye-Sung,Park, Sang-Ryoung,Kim, Min-Kyun The Korean Society of Plant Biotechnology 2011 Plant biotechnology reports Vol.5 No.1
A low acid phosphatase 3 (lap3) mutant was identified and characterized from an Arabidopsis activation-tagged (Weigel) population. The roots of the lap3 plants showed lower acid phosphatase (APase) activity compared to wild-type ones under low-Pi conditions ($10{\mu}M\;Pi$). Plasmid rescue experiments revealed that the activation-tagging vector was inserted into the intergenic region between At4g31540 and At4g31550 in the Arabidopsis genome. The genotypic segregation of the lap3 mutation was tightly linked with the phenotypic segregation of root APase activity in the prgeny of lap3. The transcript level of the At4g31520 (SDA1: SEVERE DEPOLYMERIZATION OF ACTIN 1), located 7.4 kb from the CaMV 35S enhancers in the lap3 mutant, was significantly reduced compared to that in the wild type. It was speculated that cellular actin polymerization may be involved in Pi acquisition in higher plants.
Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries
Wan, Dao Yong,Fan, Zhi Yu,Dong, Yong Xiang,Baasanjav, Erdenebayar,Jun, Hang-Bae,Jin, Bo,Jin, En Mei,Jeong, Sang Mun Hindawi Limited 2018 Journal of nanomaterials Vol.2018 No.-
<P>NCA (LiNi0.85Co0.10Al0.05-<I>x</I> M<I>x</I>O2, M=Mn or Ti, <TEX>$ x$</TEX> < 0.01) cathode materials are prepared by a hydrothermal reaction at 170°C and doped with Mn and Ti to improve their electrochemical properties. The crystalline phases and morphologies of various NCA cathode materials are characterized by XRD, FE-SEM, and particle size distribution analysis. The CV, EIS, and galvanostatic charge/discharge test are employed to determine the electrochemical properties of the cathode materials. Mn and Ti doping resulted in cell volume expansion. This larger volume also improved the electrochemical properties of the cathode materials because Mn<SUP>4+</SUP> and Ti<SUP>4+</SUP> were introduced into the octahedral lattice space occupied by the Li-ions to expand the Li layer spacing and, thereby, improved the lithium diffusion kinetics. As a result, the NCA-Ti electrode exhibited superior performance with a high discharge capacity of 179.6 mAh g<SUP>−1</SUP> after the first cycle, almost 23 mAh g<SUP>−1</SUP> higher than that obtained with the undoped NCA electrode, and 166.7 mAh g<SUP>−1</SUP> after 30 cycles. A good coulombic efficiency of 88.6% for the NCA-Ti electrode is observed based on calculations in the first charge and discharge capacities. In addition, the NCA-Ti cathode material exhibited the best cycling stability of 93% up to 30 cycles.</P>
( Hai Yan Zhao ),( Hui Ying Li ),( Jian Jin ),( Ji Zhe Jin ),( Long Ye Zhang ),( Mei Ying Xuan ),( Xue Mei Jin ),( Yu Ji Jiang ),( Hai Lan Zheng ),( Ying Shun Jin ),( Yong Jie Jin ),( Bum Soon Choi ) 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.0
Background/Aims: Accumulating evidence indicates that L-carnitine (LC) protects against multiorgan damage through its antioxidant properties and preservation of the mitochondria. Little information is available about the effects of LC on renal fibrosis. This study examined whether LC treatment would provide renoprotection in a rat model of unilateral ureteral obstruction (UUO) and in vitro. Methods: Sprague-Dawley rats that underwent UUO were treated daily with LC for 7 or 14 days. The influence of LC on renal injury caused by UUO was evaluated by histopathology, and analysis of gene expression, oxidative stress, mitochondrial function, programmed cell death, and phosphatidylinositol 3-kinase (PI3K)/ AKT/forkhead box protein O 1a (FoxO1a) signaling. In addition, H<sub>2</sub>O<sub>2</sub>-exposed human kidney cells (HK-2) were treated with LC. Results: LC treatment inhibited expression of proinflammatory and profibrotic cytokines, and was followed by a significant attenuation of tubulointerstitial inflammation and fibrosis. The increased oxidative stress caused by UUO was associated with mitochondrial dysfunction and excessive apoptosis and autophagy via PI3K/AKT/FoxO1a-dependent signaling, and this was abrogated by administration of LC. In H<sub>2</sub>O<sub>2</sub>-exposed HK-2 cells, LC decreased intracellular production of reactive oxygen species, and suppressed expression of profibrotic cytokines and reduced the number of apoptotic cells. Conclusions: LC protects against the progression of tubulointerstitial fibrosis in an obstructed kidney.
Jin, Yong‐,Mei,Jung, Jinwook,Jeon, Hyesung,Won, So Youn,Feng, Yue,Kang, Jae‐,Sook,Lee, Sang Yeol,Cheong, Jong‐,Joo,Koiwa, Hisashi,Kim, Minkyun Blackwell Publishing Ltd 2011 The New phytologist Vol.190 No.1
<P><B>Summary</B></P><P><P>Arabidopsis RNA polymerase II (RNAPII) C‐terminal domain (CTD) phosphatases regulate stress‐responsive gene expression and plant development via the dephosphorylation of serine (Ser) residues of the CTD. Some of these phosphatases (CTD phosphatase‐like 1 (CPL1) to CPL3) negatively regulate ABA and stress responses. Here, we isolated <I>AtCPL5</I>, a cDNA encoding a protein containing two CTD phosphatase domains (CPDs).</P><P>To characterize AtCPL5, we analyzed the gene expression patterns and subcellular protein localization, investigated various phenotypes of <I>AtCPL5</I>‐overexpressors and knockout mutants involved in ABA and drought responses, performed microarray and RNA hybridization analyses using <I>AtCPL5</I>‐overexpressors, and assessed the CTD phosphatase activities of the purified AtCPL5 and each CPD of the protein.</P><P>Transcripts of the nucleus‐localized AtCPL5 were induced by ABA and drought. <I>AtCPL5</I>‐overexpressors exhibited ABA‐hypersensitive phenotypes (increased inhibition of seed germination, seedling growth, and stomatal aperture), lower transpiration rates upon dehydration, and enhanced drought tolerance, while the knockout mutants showed weak ABA hyposensitivity. <I>AtCPL5</I> overexpression changed the expression of numerous genes, including those involved in ABA‐mediated responses. In contrast to Ser‐5‐specific phosphatase activity of the negative stress response regulators, purified AtCPL5 and each CPD of the protein specifically dephosphorylated Ser‐2 in RNAPII CTD.</P><P>We conclude that AtCPL5 is a unique CPL family protein that positively regulates ABA‐mediated development and drought responses in Arabidopsis.</P></P>
Liriodenine Inhibits Dopamine Biosynthesis and L-DOPA-Induced Dopamine Content in PC12 Cells
Jin, Chun-Mei,Lee, Jae-Joon,Yang, Yoo-Jung,Kim, Yu-Mi,Kim, Young-Kyoon,Ryu, Shi-Yong,Lee, Myung-Koo 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.8
The inhibitory effects of liriodenine, an aporphine isoquinoline alkaloid, on dopamine biosynthesis and L-DOPA-induced dopamine content increases in PC12 cells were investigated. Treatment of PC12 cells with 5-10 ${\mu}M$ liriodenine significantly decreased the intracellular dopamine content in a concentration-dependent manner ($IC_{50}$ value, 8.4 ${\mu}M$). Liriodenine was not cytotoxic toward PC12 cells at concentrations up to 20 ${\mu}M$. Tyrosine hydroxylase (TH) and aromatic L-amino acid decarboxylase (AADC) activities were inhibited by 10 ${\mu}M$ liriodenine to 20-70% and 10-14% of control levels at 3-12 h, respectively; TH activity was more influenced than AADC activity. The levels of TH mRNA, intracellular cyclic AMP and basal $Ca^{2+}$ concentration were also decreased by 10 ${\mu}M$ liriodenine. In addition, 10 ${\mu}M$ liriodenine reduced L-DOPA (20-100 ${\mu}M$)-induced increases in dopamine content. However, 10 ${\mu}M$ liriodenine resulted in a protective effect against L-DOPA (50-100 ${\mu}M$)-induced cytotoxicity. These results suggest that liriodenine regulates dopamine biosynthesis by partially reducing TH activity and TH gene expression and has protective effects against L-DOPA-induced cytotoxicity in PC12 cells.
Purification and Characterization of an Extracellular Protease from Bacillus pumilus CN8
Jin, Yong-Guo,Li, Hao-Li,Mal, Mei-Hu,Wang, Jun,Kim, Ha-Na,Oh, Deog-Hwan The Korean Society of Food Hygiene and Safety 2011 한국식품위생안전성학회지 Vol.26 No.1
The protease produced by a Bacillus pumilus CN8 strain was purified by DEAE-Cellulose-52 ion exchange. It has a molecular weight of approximately 96,920 Dalton. In the present study, this protease showed strong activity over a broad range of pH (6.5-9.5) and temperature from $40^{\circ}C$ to $60^{\circ}C$, and the protease performed the maximal activity at pH 7.3 at $42^{\circ}C$. The effect of metal ions on protease activity showed that $K^+$ could slightly increase the protease activity, and other ions such as $Zn^{2+}$, $Fe^{2+}$, $Na^+$, $Ca^{2+}$, $Mg^{2+}$ had no significant activation or inhibition to the protease (P> 0.05), and the more important is that $Cu^{2+}$, $Mn^{2+}$, $Sn^{2+}$, $Cd^{2+}$ had a strong inhibitory effect on the protease activity.
Magnolol Inhibits LPS-induced NF-ՊB/Rel Activation by Blocking p38 Kinase in Murine Macrophages
Mei Hong Li,Gugan Kothandan,Seung Joo Cho,Pham Thi Thu Huong,Yong Hai Nan,Kun Yeong Lee,Song Yub Shin,Sung Su Yea,Young Jin Jeon 대한생리학회-대한약리학회 2010 The Korean Journal of Physiology & Pharmacology Vol.14 No.6
This study demonstrates the ability of magnolol, a hydroxylated biphenyl compound isolated from Magnolia officinalis, to inhibit LPS-induced expression of iNOS gene and activation of NF-ՊB/Rel in RAW 264.7 cells. Immunohisto-chemical staining of iNOS and Western blot analysis showed magnolol to inhibit iNOS gene expression. Reporter gene assay and electrophoretic mobility shift assay showed that magnolol inhibited NF-ՊB/Rel transcriptional activation and DNA binding, respectively. Since p38 is important in the regulation of iNOS gene expression, we investigated the possibility that magnolol to target p38 for its anti-inflammatory effects. A molecular modeling study proposed a binding position for magnolol that targets the ATP binding site of p38 kinase (3GC7). Direct interaction of magnolol and p38 was further confirmed by pull down assay using magnolol conjugated to Sepharose 4B beads. The specific p38 inhibitor SB203580 abrogated the LPS-induced NF-ՊB/Rel activation, whereas the selective MEK-1 inhibitor PD98059 did not affect the NF-ՊB/Rel. Collectively, the results of the series of experiments indicate that magnolol inhibits iNOS gene expression by blocking NF-ՊB/Rel and p38 kinase signaling.