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Multifaceted adsorption of α-cyano-4-hydroxycinnamic acid on silver colloidal and island surfaces
Jung, Dawoon,Jeon, Kooknam,Yeo, Juhyun,Hussain, Shafqat,Pang, Yoonsoo Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.425 No.-
<P><B>Abstract</B></P> <P>The surface adsorption of organic nitrile compounds on the silver colloidal and island surfaces has been studied using surface-enhanced Raman scattering (SERS). α-Cyano-4-hydroxycinnamic acid (CHCA) with nitrile and carboxyl groups shows various surface adsorption on the silver surfaces. In acidic conditions, the surface adsorption of CHCA via the nitrile group with a more or less tilted geometry to the surface was found. When the solution pH increases, the carboxylate and nitrile groups of deprotonated CHCA participate in the surface adsorption, whereas the molecular plane of CHCA becomes more parallel to the surface. The ν(CN) band in SERS of CHCA is the indicator of the surface adsorption geometry. The strongly red-shifted and broadened ν(CN) band in SERS represents the surface adsorption via π-electrons of the CN bond (side-on geometry; π-coordination). Nitriles adsorbed on the surface via the nonbonding electron pair of the nitrogen atom (end-on geometry; σ-coordination) often cause the blue-shifts and small band broadening in ν(CN) in SERS. The surface adsorption geometry of organic nitriles based on many previous experimental results was further confirmed by the surface adsorption of CHCA on the silver island surfaces and dinitrile compounds on the silver colloidal surfaces.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Organic nitriles show two distinct adsorption geometries on silver nanosurfaces. </LI> <LI> Surface adsorption via nitrile and carboxylate groups showed strong pH dependence. </LI> <LI> SERS is a powerful tool for the molecular structure of surface-adsorbed species. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Dynamic 3-D Visualization of the Korea Pathfinder Lunar Orbiter Attitude Control Simulator
Dawoon Jung,Jae Wook Kwon,Kwangyul Baek,Han Woong Ahn,Jong-Wook Choi 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Visualizing the Korea Pathfinder Lunar Orbiter (KPLO) attitude control behavior is useful for verifying dynamical characteristics unseen in previous Earth-orbiting satellite missions. This paper describes a visualization component of the LUNASIM simulator running unmodified attitude control flight software that is able to communicate with an external program to animate realistically in three dimensions the simulated attitude and orbital state, thruster firings, and solar array rotations of KPLO at faster-than real-time speeds for intuitive design verification. Visualization is also supported when LUNASIM is connected to a processor emulator in a fully end-to-end simulated ETB environment. Results are presented illustrating accurate spacecraft dynamics during special mission scenarios such as roll maneuvering while Sun-pointing near the ecliptic plane, yaw-flipped lunar orbit attitude, and slewing to image the lunar surface while in 45-degree tilted attitude. These results demonstrate the value of visualizing attitude control simulator output for novel spacecraft missions.
Jung, In Hye,Chung, Yong-Yoon,Jung, Dawoon E.,Kim, Young Jin,Kim, Do Hee,Kim, Kyung-Sik,Park, Seung Woo Neoplasia Press 2016 Neoplasia Vol.18 No.8
<P>Severe combined immunodeficiency (SCID) mice have widely been used as hosts for human tumor cell xenograft study. This animal model, however, is labor intensive. As zebrafish is largely emerging as a promising model system for studying human diseases including cancer, developing efficient immunocompromised strains for tumor xenograft study are also demanded in zebrafish. Here, we have created the <I>Prkdc</I>-null SCID zebrafish model which provides the stable immune-deficient background required for xenotransplantation of tumor cell. In this study, the two transcription activator-like effector nucleases that specifically target the exon3 of the zebrafish <I>Prkdc</I> gene were used to induce a frame shift mutation, causing a complete knockout of the gene function. The SCID zebrafish showed susceptibility to spontaneous infection, a well-known phenotype found in the SCID mutation. Further characterization revealed that the SCID zebrafish contained no functional T and B lymphocytes which reflected the phenotypes identified in the mice SCID model. Intraperitoneal injection of human cancer cells into the adult SCID zebrafish clearly showed tumor cell growth forming into a solid mass. Our present data show the suitability of using the SCID zebrafish strain for xenotransplantation experiments, and <I>in vivo</I> monitoring of the tumor cell growth in the zebrafish demonstrates use of the animal model as a new platform of tumor xenograft study.</P>