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Kim, Heonjo,Chae, Youngjoo,Lee, Duck Hyun,Kim, Minsik,Huh, Jiyoung,Kim, Youngki,Kim, Hyunjin,Kim, Hyun Jung,Kim, Sang Ouk,Baik, Hionsuck,Choi, Kihang,Kim, Jong Seung,Yi, Gi-Ra,Lee, Kwangyeol WILEY-VCH Verlag 2010 Angewandte Chemie Vol.122 No.33
<B>Graphic Abstract</B> <P>Eine doppelte Rolle spielen Pd-Nanopartikel bei der Umwandlung von Fe-Nanopartikeln und einer P-Quelle in Fe<SUB>2</SUB>P-Nanostäbchen: als Katalysatoren, die Fe-Nanopartikel unter Bildung löslicher Vorstufen destabilisieren, und als Katalysezentren für das Wachstum von Nanostäbchen (siehe Bild). Durchmesser und Länge der Nanostäbchen lassen sich über den Durchmesser der Pd-Nanopartikel bzw. das Fe/Pd-Verhältnis einstellen. <img src='wiley_img_2010/00448249-2010-122-33-ANGE201001822-content.gif' alt='wiley_img_2010/00448249-2010-122-33-ANGE201001822-content'> </P>
Kim, Heonjo,Chae, Youngjoo,Lee, Duck Hyun,Kim, Minsik,Huh, Jiyoung,Kim, Youngki,Kim, Hyunjin,Kim, Hyun Jung,Kim, Sang Ouk,Baik, Hionsuck,Choi, Kihang,Kim, Jong Seung,Yi, Gi-Ra,Lee, Kwangyeol WILEY-VCH Verlag 2010 Angewandte Chemie Vol.49 No.33
<B>Graphic Abstract</B> <P>Playing a dual role as a catalyst that destabilizes Fe nanoparticles to form soluble precursors in situ and as a catalytic center for nanorod growth allows Pd nanoparticles to transform Fe nanoparticles and a P source into Fe<SUB>2</SUB>P nanorods (see scheme). The diameter and length of the Fe<SUB>2</SUB>P nanorods can be fine-tuned by means of the diameter of the Pd nanoparticles and the Fe/Pd ratio, respectively. <img src='wiley_img_2010/14337851-2010-49-33-ANIE201001822-content.gif' alt='wiley_img_2010/14337851-2010-49-33-ANIE201001822-content'> </P>
Kim, Suji,Lee, Kyu-Sun,Choi, Seunghwan,Kim, Joohwan,Lee, Dong-Keon,Park, Minsik,Park, Wonjin,Kim, Tae-Hoon,Hwang, Jong Yun,Won, Moo-Ho,Lee, Hansoo,Ryoo, Sungwoo,Ha, Kwon-Soo,Kwon, Young-Guen,Kim, Youn American Society for Biochemistry and Molecular Bi 2018 The Journal of biological chemistry Vol.293 No.49
<P>Inflammatory cytokines, including tumor necrosis factor-α (TNFα), were elevated in patients with cardiovascular diseases and are also considered as crucial factors in the pathogenesis of preeclampsia; however, the underlying pathogenic mechanism has not been clearly elucidated. This study provides novel evidence that TNFα leads to endothelial dysfunction associated with hypertension and vascular remodeling in preeclampsia through down-regulation of endothelial nitric-oxide synthase (eNOS) by NF-κB–dependent biogenesis of microRNA (miR)-31-5p, which targets eNOS mRNA. In this study, we found that miR-31-5p was up-regulated in sera from patients with preeclampsia and in human endothelial cells treated with TNFα. TNFα-mediated induction of miR-31-5p was blocked by an NF-κB inhibitor and NF-κB p65 knockdown but not by mitogen-activated protein kinase (MAPK) and phosphatidylinositol 3-kinase inhibitors, indicating that NF-κB is essential for biogenesis of miR-31-5p. The treatment of human endothelial cells with TNFα or miR-31-5p mimics decreased endothelial nitric-oxide synthase (eNOS) mRNA stability without affecting <I>eNOS</I> promoter activity, resulting in inhibition of eNOS expression and NO/cGMP production through blocking of the functional activity of the eNOS mRNA 3′-UTR. Moreover, TNFα and miR-31-5p mimic evoked endothelial dysfunction associated with defects in angiogenesis, trophoblastic invasion, and vasorelaxation in an <I>ex vivo</I> cultured model of human placental arterial vessels, which are typical features of preeclampsia. These results suggest that NF-κB–responsive miR-31-5p elicits endothelial dysfunction, hypertension, and vascular remodeling via post-transcriptional down-regulation of eNOS and is a molecular risk factor in the pathogenesis and development of preeclampsia.</P>
Highly Photosensitive J‐Aggregated Single‐Crystalline Organic Transistors
Kim, Kyung Hwan,Bae, Suk Young,Kim, Youn Sun,Hur, Jung A.,Hoang, Mai Ha,Lee, Tae Wan,Cho, Min Ju,Kim, Youngmee,Kim, Minsik,Jin, Jung‐,Il,Kim, Sung‐,Jin,Lee, Kwangyeol,Lee, Suk Joong,Choi, WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.27
<P><B>Anthracene‐based conjugated molecules</B> are synthesized and J‐aggregations are clearly observed in a single‐crystal structure study. Single‐crystal‐based field‐effect transistors (FETs) exhibit high field‐effect mobility. They displayed dramatic photoinduced enhancement of the drain current and showed unusually high photoresponsivity under extremely low intensity light. Due to the photoinduced enhancement of excitons, single and multiple‐stage memory operations are achieved.</P>
High-Resolution Synthesized Magnetic Field Focusing for RF Barcode Applications
Kim, Min-Woo,Kim, Ji H.,Cho, Yeonje,Kim, Minsik,Choi, Bo H.,Lee, Kwyro,Kim, Joungho,Cho, Gyu-Hyeong,Rim, Chun T. Institute of Electrical and Electronics Engineers 2018 IEEE transactions on industrial electronics Vol.65 No.1
<P>A prototype of a high-resolution synthesized magnetic field focusing (SMF) system for a possible application to radio frequency (RF) barcodes is proposed in this paper. It was recently found that coordinated control of array coil currents makes it possible to focus magnetic field, which is requisite for medical imaging, wireless power, and RF identification. Different from conventional phased array RF antennas, SMF is independent of frequency, which is quite promising for various applications. In this paper, an array of rectangular air coils is proposed, and various implementation issues, such as accurate control of coil currents and compact RF barcode design, are newly suggested. A prototype of an SMF system composed of a transmitter (Tx), an RF barcode, and a receiver (Rx) was implemented at below 1 MHz operating frequency. The Tx includes modularized control drivers, full-bridge switching converters, and 16 arrayed air coils, where the RF barcodes proposed in this paper include a self-resonating circuit at 20 mm × 20 mm and a tunable resonating circuit at 15 mm × 15 mm. In this way, a 5 mm resolution at a distance of 20 mm was achieved for the Tx arrayed air coils with spacing of 5 mm, which is about four times sharper magnetic field focusing compared to a nonfocusing conventional coil. Furthermore, the proposed SMF system allows the designed 5-bit RF barcode array to be fully distinguishable at a 15 mm distance.</P>
Noncanonical DNA-binding mode of repressor and its disassembly by antirepressor
Kim, Minsik,Kim, Hee Jung,Son, Sang Hyeon,Yoon, Hye Jin,Lim, Youngbin,Lee, Jong Woo,Seok, Yeong-Jae,Jin, Kyeong Sik,Yu, Yeon Gyu,Kim, Seong Keun,Ryu, Sangryeol,Lee, Hyung Ho National Academy of Sciences 2016 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.113 No.18
<P>DNA-binding repressors are involved in transcriptional repression in many organisms. Disabling a repressor is a crucial step in activating expression of desired genes. Thus, several mechanisms have been identified for the removal of a stably bound repressor (Rep) from the operator. Here, we describe an uncharacterized mechanism of noncanonical DNA binding and induction by a Rep from the temperate Salmonella phage SPC32H; this mechanism was revealed using the crystal structures of homotetrameric Rep (92-198) and a hetero-octameric complex between the Rep and its antirepressor (Ant). The canonical method of inactivating a repressor is through the competitive binding of the antirepressor to the operator-binding site of the repressor; however, these studies revealed several noncanonical features. First, Ant does not compete for the DNA-binding region of Rep. Instead, the tetrameric Ant binds to the C-terminal domains of two asymmetric Rep dimers. Simultaneously, Ant facilitates the binding of the Rep N-terminal domains to Ant, resulting in the release of two Rep dimers from the bound DNA. Second, the dimer pairs of the N-terminal DNA-binding domains originate from different dimers of a Rep tetramer (trans model). This situation is different from that of other canonical Reps, in which two N-terminal DNA-binding domains from the same dimeric unit form a dimer upon DNA binding (cis model). On the basis of these observations, we propose a noncanonical model for the reversible inactivation of a Rep by an Ant.</P>
Sun Kim, Youn,Young Bae, Suk,Hwan Kim, Kyung,Wan Lee, Tae,Hur, Jung A,Ha Hoang, Mai,Ju Cho, Min,Kim, Sung-Jin,Kim, Youngmee,Kim, Minsik,Lee, Kwangyeol,Joong Lee, Suk,Hoon Choi, Dong Royal Society of Chemistry 2011 Chemical communications Vol.47 No.31
<P>A new pyrene-cored π-conjugated molecule has been synthesized through Sonogashira coupling reaction. The single-crystalline microribbon-based FET exhibited the highest mobility of 0.7 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> (<I>I</I><SUB>on</SUB>/<I>I</I><SUB>off</SUB> > 10<SUP>6</SUP>). Single-crystalline microribbons were employed to operate in an organic phototransistor (OPT) under very low light intensity (<I>I</I> = 5.6 μW cm<SUP>−2</SUP>).</P> <P>Graphic Abstract</P><P>A new pyrene-cored π-conjugated molecule shows <I>I</I><SUB>on</SUB>/<I>I</I><SUB>off</SUB> > 10<SUP>6</SUP> in an FET. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc11589h'> </P>