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Simple and Reliable Method to Incorporate the Janus Property onto Arbitrary Porous Substrates
You, Jae Bem,Yoo, Youngmin,Oh, Myung Seok,Im, Sung Gap American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.6
<P>Economical fabrication of waterproof/breathable substrates has many potential applications such as clothing or improved medical dressing. In this work, a facile and reproducible fabrication method was developed to render the Janus property to arbitrary porous substrates. First, a hydrophobic surface was obtained by depositing a fluoropolymer, poly(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl methacrylate) (PHFDMA), on various porous substrates such as polyester fabric, nylon mesh, and filter paper. With a one-step vapor-phase deposition process, termed as initiated chemical vapor deposition (iCVD), a conformal coating of hydrophobic PHFDMA polymer film was achieved on both faces of the porous substrate. Since the hydrophobic perfluoroalkyl functionality is tethered on PHFDMA via hydrolyzable ester functionality, the hydrophobic functionality on PHFDMA was readily released by hydrolysis reaction. Here, by simply floating the PHFDMA-coated substrates on KOH(aq) solution, only the face of the PHFDMA-coated substrate in contact with the KOH(aq) solution became hydrophilic by the conversion of the fluoroalkyl ester group in the PHFDMA to hydrophilic carboxylic acid functionality. The hydrophilized face was able to easily absorb water, showing a contact angle of less than 37°. However, the top side of the PHFDMA-coated substrate was unaffected by the exposure to KOH(aq) solution and remained hydrophobic. Moreover, the carboxylated surface was further functionalized with aminated polystyrene beads. The porous Janus substrates fabricated using this method can be applied to various kinds of clothing such as pants and shirts, something that the lamination process for Gore-tex has not allowed.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-6/am4054354/production/images/medium/am-2013-054354_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am4054354'>ACS Electronic Supporting Info</A></P>
Anti-inflammatory effect of resveratrol by inhibition of IL-8 production in LPS-induced THP-1 cells.
Oh, You-Chang,Kang, Ok-Hwa,Choi, Jang-Gi,Chae, Hee-Sung,Lee, Young-Seob,Brice, Obiang-Obounou,Jung, Hyun Ju,Hong, Seung-Heon,Lee, Young-Mi,Kwon, Dong-Yeul Institute for Advanced Research in Asian Science a 2009 The American journal of Chinese medicine Vol.37 No.6
<P>Resveratrol is a polyphenol compound and prominent anti-inflammatory agent found in plants, including the fruits of Morus alba. However, the therapeutic mechanisms of resveratrol remain largely unclear. To gain insight into the biological effects of resveratrol, we examined its influence on LPS-induced IL-8 production in the human monocytic cell line, THP-1. In inflammatory diseases, IL-8 plays a central role in the initiation and maintenance of inflammatory response. In the present study, IL-8 production was measured by ELISA and RT-PCR, while MAPK activation, IkappaBalpha degradation, nuclear factor (NF)-kappaB activation and cyclooxygenase (COX)-2 expression were determined by Western blot analysis. Resveratrol inhibited LPS-induced IL-8 production in a dose-dependent manner. Furthermore, resveratrol inhibited extracellular signal-regulated kinase (ERK) and p38 MAPK phosphorylation, IkappaBalpha degradation, NF-kappaB activation and cyclooxygenase (COX)-2 expression, which suggest that resveratrol inhibits IL-8 secretion by blocking MAPK phosphorylation and NF-kappaB activation. Taken together, these findings may help elucidate the mechanism by which resveratrol modulates THP-1 cell activation under inflammatory conditions.</P>
Vehicle Lateral Stability Management Using Gain-Scheduled Robust Control
You, Seung-Han,Jo, Joon-Sang,Yoo, Seung-Jin,Hahn, Jin-Oh,Lee, Kyo-Il The Korean Society of Mechanical Engineers 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.11
This paper deals with the design of a yaw rate controller based on gain-scheduled H$\infty$ optimal control, which is intended to maintain the lateral stability of a vehicle. Uncertain factors such as vehicle mass and cornering stiffness in the vehicle yaw rate dynamics naturally call for the robustness of the feedback controller and thus H$\infty$ optimization technique is applied to synthesize a controller with guaranteed robust stability and performance against the model uncertainty. In the implementation stage, the feed-forward yaw moment by driver's steer input is estimated by the disturbance observer in order to determine the accurate compensatory moment. Finally, HILS results indicate that the proposed yaw rate controller can satisfactorily improve the lateral stability of an automobile.
Synthesis and Biological Evaluation of Isophthalamide Derivatives as T-type Calcium Channel Blockers
Oh, You-Na,Kim, Yoon-Jee,Seo, Seon-Hee,Lee, Jae-Kyun,Rhim, Hye-Whon,Pae, Ae-Nim,Jeong, Kyu-Sung,Choo, Hyun-Ah,Cho, Yong Seo Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.10