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우명우,이현구 순천대학교 기초과학연구소 1990 基礎科學硏究誌 Vol.1 No.-
ZSM-5 촉매를 제조하고 메탄올 전환반응에 적용하여 반응 속도에 관한 실험연구를 수행하였다. ZSM-5 촉매상에서 메탄올 전환반응에서는 많은 종류의 탄화수소들이 생성되는 데, 본 연구에서는 접촉시간을 조절하여 주로 C_2, C_3 및 C_4 탄화수소들이 생성되는 조건하에서 반응실험을 수행하였으며 lumping의 개념을 적용하여 이 경우의 반응 경로와 각 반응의 속도 상수들을 결정하였다. 이로부터 메탄올이 dimethyl ether로 변환되어 평형상태를 유지하면서 C_2 및 C_4 탄화수소들이 병행반응으로 생성되고, 생성된 C_2 및 C_4 탄화수소들로부터 C_3 탄화수소가 생성되는 것으로 추정되었다.
Polarization independent polymer waveguide tunable receivers incorporating a micro-optic circulator
Wu, Xiaoping,Park, Tae-Hyun,Park, Su-Hyun,Seo, Jun-Kyu,Oh, Min-Cheol Elsevier 2018 OPTICS COMMUNICATIONS - Vol.416 No.-
<P><B>Abstract</B></P> <P>In order to simplify the receiver configuration in a wavelength division multiplexed optical fiber network, compact wavelength tunable filters have long been expected to be used as channel selectors. Bragg reflector inherently has the most suitable reflection spectrum for filtering a single wavelength from the densely multiplexed wavelength signal. Polymer has high thermo-optic coefficient and good thermal insulation property compared to the other optical waveguide materials such as silicon and silica materials. This can be used to broadly tune the reflection spectrum of Bragg reflector using a simple micro-heater. In this work, a micro-optic circulator component and a polymeric Bragg reflector device are assembled to produce a small form factor tunable receiver. Compared to the integrated-optical versions, the micro-optics are based on well-developed manufacturing processes and can achieve competitive production yields. The device exhibits high reflectivity with a flat top passband, and a polarization dependence of 0.06 nm achieved by virtue of the low birefringence of LFR polymer, which make a significant contribution to the implementation of polarization independent tunable receiver. The wavelength tuning range of 40 nm is demonstrated by using a bottom located heater with a groove for heat isolation.</P>
Wu, Jie,Kim, Sol,Kwak, Man Sup,Jeong, Jang Bin,Min, Hyun Jin,Yoon, Ho-Geun,Ahn, Jin-Hyun,Shin, Jeon-Soo American Society for Biochemistry and Molecular Bi 2014 The Journal of biological chemistry Vol.289 No.29
<P>High mobility group nucleosomal binding domain 2 (HMGN2) is a small and unique non-histone protein that has many functions in a variety of cellular processes, including regulation of chromatin structure, transcription, and DNA repair. In addition, it may have other roles in antimicrobial activity, cell homing, and regulating cytokine release. Although the biochemical properties of HMGN2 protein are regulated by acetylation and phosphorylation, it is not yet known whether HMGN2 activity can also be regulated by SUMOylation. In this study, we demonstrated for the first time that HMGN2 is modified by covalent attachment of small ubiquitin-related modifier 1 (SUMO1) by pro-inflammatory signal and identified the major SUMOylated lysine residues that localize to the HMGN2 nucleosome-binding domain at Lys-17 and Lys-35. SENP1 can deSUMOylate SUMOylated HMGN2, and PIAS1 is the E3 ligase responsible for SUMOylation of HMGN2. Finally, using SUMO1-conjugated HMGN2 purified from a basal SUMOylation system in <I>Escherichia coli</I>, we demonstrated that SUMOylated HMGN2 has decreased the binding affinity to nucleosome core particles in comparison to unSUMOylated HMGN2. These observations potentially provide new perspectives for understanding the functions of HMGN2 in inflammatory reaction.</P>