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RYOO, Ryong,KANG, Sung Kyu,CHO, Sung June 공주대학교 자원재활용 신소재 연구센터 1999 1차년도 센터 성과집 Vol.1999 No.-
Ptcatalyst in KL zeolite is converted to PtPd bimetallic catalyst by the ion exchange Pd(NH₃)₄²- and subsequent reduction in hydrogen flow at 573K. The results of xenon adsorption measurement. hydrogen chemisorption, 129Xe NMR spectroscopy and X-ray absorption fine structure spectroscopy indicates the formation of PdPt nimetallic cluster inside the KL zeolite channel. It is believed that n-butane hydrogenolysis occurs over the obtained PdPt bimetallic cluster in the absence of multiple pore blockage.
크세논-129 핵자기 공명 분광법을 이용한 불균일계 촉매의 연구
유룡 ( Ryong Ryoo ) 한국공업화학회 1991 공업화학 Vol.2 No.1
Xenon-129 NMR technique has been developed since 1980 as a new method for the characterization of microporous materials such as zeolites, activated carbons and alumina by using chemical shift and linewidth variations in ^129Xe NMR of adsorbed xenon gas. This NMR technique has been known to be very effective to probe the locational and the chemical changes of the supported metallic species as well as the physicochemical change of the support material. Recently, this method has been successfully applied for the characterization of amorphous materials such as activated carbons, silica and alumina. Basic principles, experimental techniques and recent applications of the ^129Xe NMR method for the study of heterogeneous catalysts are introduced in this paper.
메조포러스 분자체 MCM -48 의 합성 및 특성 분석
유룡,김지만 한국공업화학회 1998 응용화학 Vol.2 No.1
An easy and reproducitble synthesis procedure to obtain a cubic mesoporous molecular sieve MCM-48 has been investigated by the hydrothermal reaction between sodium silicate and hexadecyltrimethylammonium bromide in the presence of auxiliary additives such as ethanol, methanol, etc. The resultant MCM-48 exhibits not only an excellent structural order but also a single crystal-like morphology of cubes truncated by rhomb dodecahedron. The MCM-48 cubic crystals grow from disordered particles that are formed during the initial period of the hydrothermal reaction, subsequently transforming to a lamellar phase, This kinetic-controlled crystallization process for the MCM-48 is very similar to that of microporous zeolites, the activation energy being 14 ㎉ mol^1.
Ryoo, In-Ja,Park, Hae-Ryong,Choo, Soo-Jin,Hwang, Ji-Hwan,Park, Young-Min,Bae, Ki-Hwan,Shin-Ya, Kazuo,Yoo, Ick-Dong Pharmaceutical Society of Japan 2006 BIOLOGICAL & PHARMACEUTICAL BULLETIN Vol.29 No.4
<P>Glucose deprivation is a fundamental feature of poorly vascularized solid tumors and leads to activation of the molecular chaperone GRP78, which is associated with the unfolded protein response (UPR), a stress-signaling pathway, in tumor cells. We recently isolated an active compound, M126, that inhibits transcription from a GRP78 promoter reporter construct. M126 was identified as valinomycin by various spectroscopic methods. We found that valinomycin prevents UPR-induced protein expression, such as GRP78 and GRP94. The GRPs-inhibitory action of valinomycin severe hypoglycemic and results in selective cell death of the stressed cancer cells. Our findings demonstrate that GRP78 may be an excellent target for the use of cancer chemotherapy in the treatment of solid tumors.</P>
Expression and Functional Analysis of Rice Plastidic Maltose Transporter, OsMEX1
Ryoo, Nayeon,Eom, Joon-Seob,Kim, Hyun-Bi,Vo, Bich Thuy,Lee, Sang-Won,Hahn, Tae-Ryong,Jeon, Jong-Seong 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.2
In Arabidopsis, maltose is a major product of the transitory starch degradation pathway at night, and its mobilization from the chloroplasts to the cytosol in leaf tissues via a plastidic maltose transporter, AtMEX1, is essential for normal plant growth. However, such a starch utilization pathway has not yet been characterized in rice (Oryza sativa), a monocot model plant. Examination of expression profiles of a rice plastidic maltose transporter, OsMEX1, by real-time polymerase chain reaction showed that it is abundant in the pollen grain-containing stamens of mature flowers. Consistently, high performance liquid chromatography analysis revealed a relatively high maltose content in mature flowers, suggesting that OsMEX1 mainly functions in the tissues. OsMEX1-green fluorescent protein fusion experiment confirmed that OsMEX1 localizes at the chloroplast envelope in both rice and Arabidopsis. Arabidopsis maltose excess1 (mex1) mutant was transformed with OsMEX1 fused to the cauliflower mosaic virus 35S (CaMV35S) promoter. In the resulting transgenic plants, the typical mutant phenotypes of Arabidopsis mex1, such as chlorosis, stunted growth, and maltose and starch deposition at the end of the night, are clearly rescued. This result demonstrates that OsMEX1 functions as a plastidic maltose transporter in Arabidopsis. Our present findings thus suggest that whereas the Arabidopsis MEX1 gene essentially functions in source leaf tissues, its rice counterpart likely has a role in the pollens of mature flowers.