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Cho, Hana,Strader, Matthew L.,Hong, Kiryong,Jamula, Lindsey,Gullikson, Eric M.,Kim, Tae Kyu,de Groot, Frank M. F.,McCusker, James K.,Schoenlein, Robert W.,Huse, Nils The Royal Society of Chemistry 2012 Faraday discussions Vol.157 No.-
<P>Ultrafast excited-state evolution in polypyridyl Fe(<SMALL>II</SMALL>) complexes is of fundamental interest for understanding the origins of the sub-ps spin-state changes that occur upon photoexcitation of this class of compounds as well as for the potential impact such ultrafast dynamics have on incorporation of these compounds in solar energy conversion schemes or switchable optical storage technologies. We have demonstrated that ground-state and, more importantly, ultrafast time-resolved X-ray absorption methods can offer unique insights into the interplay between electronic and geometric structure that underpins the photo-induced dynamics of this class of compounds. The present contribution examines in greater detail how the symmetry of the ligand field surrounding the metal ion can be probed using these X-ray techniques. In particular, we show that steady-state K-edge spectroscopy of the nearest-neighbour nitrogen atoms reveals the characteristic chemical environment of the respective ligands and suggests an interesting target for future charge-transfer femtosecond and attosecond spectroscopy in the X-ray water window.</P>
Cho, Hyejeon,Blakeslee, John P.,Chies-Santos, Ana L.,Jee, M. James,Jensen, Joseph B.,Peng, Eric W.,Lee, Young-Wook American Astronomical Society 2016 The Astrophysical journal Vol.822 No.2
<P>We present new Hubble Space Telescope (HST) optical and near-infrared (NIR) photometry of the rich globular cluster (GC) system NGC 4874, the cD galaxy in the core of the Coma cluster (Abell 1656). NGC 4874 was observed with the HST Advanced Camera for Surveys in the F475W (g(475)) and F814W (I-814) passbands and with the Wide Field Camera. 3 IR Channel in F160W (H-160). The GCs in this field exhibit a bimodal optical color distribution with more than half of the GCs falling on the red side at g(475)-I-814 > 1. Bimodality is also present, though less conspicuously, in the optical-NIR I-814-H-160 color. Consistent with past work, we find evidence for nonlinearity in the g(475)-I-814 versus I-814-H-160 color-color relation. Our results thus underscore the need for understanding the detailed form of the color-metallicity relations in interpreting observational data on GC bimodality. We also find a very strong color-magnitude trend, or 'blue tilt,' for the blue component of the optical color distribution of the NGC 4874 GC system. A similarly strong trend is present for the overall mean I-814-H-160 color as a function of magnitude; for M-814 < -10 mag, these trends imply a steep mass-metallicity scaling with Z proportional to M-GC(1.4 +/- 0.4), but the scaling is not a simple power law and becomes much weaker at lower masses. As in other similar systems, the spatial distribution of the blue GCs is more extended than that of the red GCs, partly because of blue GCs associated with surrounding cluster galaxies. In addition, the center of the GC system is displaced by 4 +/- 1 kpc toward the southwest from the luminosity center of NGC 4874, in the direction of NGC 4872. Finally, we remark on a dwarf elliptical galaxy with a noticeably asymmetrical GC distribution. Interestingly, this dwarf has a velocity of nearly -3000 km s(-1) with respect to NGC 4874; we suggest it is on its first infall into the cluster core and is undergoing stripping of its GC system by the cluster potential.</P>
Distraction Osteogenesis of Free Interpositional Membranous Bone : Experimental Design
Cho, Byung Chae,Lee, Jung Hyung,Baik, Bong Soo,Wein Liou, Eric Jein,Figueroa, Alvaro A.,Cohen, Mimis 경북대학교 병원 2001 경북대학교병원의학연구소논문집 Vol.5 No.1
The propose of this study is to explore the possibility of bone formation in distraction osteogenesis of the free interpositional membranous bone. Three canine dogs were used as subjects.Two mandibular osteotomies were made in the mandibular body,The oral soft tissue and periosteum of the segment between the two osteotomies were freed from preiosteum amd the surrounding soft tissue as a free interpositional bone graft 2 ㎝ wide was created.The free interpositional bone was fixed to the proximal mandibular body with miniplate.The external fixation device was applied to the proximal mandibular body and the distal mandibular body. Mndibular distractions were performed postperatively at a rate of 1㎜/day for a total of 10-㎜ distraction for 10days.The latency period was 1 week in Dog1, 2weeks in Dog2, and 3 weeks in Dog3.Three dogs were killed 6 weeks after distraction, and interpositional bone specimens were obtained.In Dogs1 and 2, the free interpositional bone showed servere resption and had no new bone formation at the distracted area.However, in Dog3, new bone developed along the distracted gap. Our study demonstrated the possibility of distraction osetogenesis in the free interpositional membranous bone and suggested that free interpositional membranous bone be allowed, under rigid fixation device, to have enough revascularization from surrounding tissue to have osteogenesis for at least 3 weeks or even more.
Cho, Hong Y.,Srinivasan, Abiraman,Hong, Joanna,Hsu, Eric,Liu, Shiguang,Shrivats, Arun,Kwak, Dan,Bohaty, Andrew K.,Paik, Hyun-jong,Hollinger, Jeffrey O.,Matyjaszewski, Krzysztof American Chemical Society 2011 Biomacromolecules Vol.12 No.10
<P>Star polymers with poly(ethylene glycol) (PEG) arms and a degradable cationic core were synthesized by the atom transfer radical copolymerization (ATRP) of poly(ethylene glycol) methyl ether methacrylate macromonomer (PEGMA), 2-(dimethylamino)ethyl methacrylate (DMAEMA), and a disulfide dimethacrylate (cross-linker, SS) via an “<I>arm-first</I>” approach. The star polymers had a diameter ∼15 nm and were degraded under redox conditions by glutathione treatment into individual polymeric chains due to cleavage of the disulfide cross-linker, as confirmed by dynamic light scattering. The star polymers were cultured with mouse calvarial preosteoblast-like cells, embryonic day 1, subclone 4 (MC3T3-E1.4) to determine biocompatibility. Data suggest star polymers were biocompatible, with ≥80% cell viability after 48 h of incubation even at high concentration (800 μg/mL). Zeta potential values varied with N/P ratio confirming complexation with siRNA. Successful cellular uptake of the star polymers in MC3T3-E1.4 cells was observed by confocal microscopy and flow cytometry after 24 h of incubation.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bomaf6/2011/bomaf6.2011.12.issue-10/bm2006455/production/images/medium/bm-2011-006455_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bm2006455'>ACS Electronic Supporting Info</A></P>
Cho, Geonho,Guilbert, Eric,Lee, Seunghwan 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.2 No.1
<P><B>Abstract</B></P> <P>New distributional record from South Korea is presented for <I>Baeochila scitula</I>. Diagnosis and images are presented and a key to species of the genus is provided for distinguishing included taxa.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Genus <I>Baeochila</I> Drake and Poor, 1937 is reported for the first time in Korea. </LI> <LI> Diagnosis and habitus images of <I>Baeochila scitula</I> are presented. </LI> <LI> A key to species of the genus is provided for distinguishing included taxa. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Michel, Eric,Hernandez, Daniel,Cho, Min Hyoung,Lee, Soo Yeol Published for the American Association of Physicis 2014 Medical physics Vol.41 No.10
<P>To validate the use of adaptive nonlinear filters in reconstructing conductivity and permittivity images from the noisy B1(+) maps in electrical properties tomography (EPT).</P>
Moyen, Eric,Kanwat, Anil,Cho, Sinyoung,Jun, Haeyeon,Aad, Roy,Jang, Jin The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.18
<P>Perovskite quantum dots have recently emerged as a promising light source for optoelectronic applications. However, integrating them into devices while preserving their outstanding optical properties remains challenging. Due to their ionic nature, perovskite quantum dots are extremely sensitive and degrade on applying the simplest processes. To maintain their colloidal stability, they are surrounded by organic ligands; these prevent efficient charge carrier injection in devices and have to be removed. Here we report on a simple method, where a moderate thermal process followed by exposure to UV in air can efficiently remove ligands and increase the photo-luminescence of the room temperature synthesized perovskite quantum dot thin films. Annealing is accompanied by a red shift of the emission wavelength, usually attributed to the coalescence and irreversible degradation of the quantum dots. We show that it is actually related to the relaxation of the quantum dots upon the ligand removal, without the creation of non-radiative recombining defects. The quantum dot surface, as devoid of ligands, is subsequently photo-oxidized and smoothened upon exposure to UV in air, which drastically enhances their photo-luminescence. This adequate combination of treatments improves by more than an order of magnitude the performances of perovskite quantum dot light emitting diodes.</P>