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Cho, Y.,Choi, M.H.,Kim, B.,Kim, S. Elsevier 2016 Journal of chromatography A Vol.1444 No.-
<P>An experimental setup for the speciation of compounds by hydrogen/deuterium exchange (HDX) with atmospheric pressure ionization while performing chromatographic separation is presented. The proposed experimental setup combines the high performance supercritical fluid chromatography (SFC) system that can be readily used as an inlet for mass spectrometry (MS) and atmospheric pressure photo ionization (APPI) or atmospheric pressure chemical ionization (APCI) HDX. This combination overcomes the limitation of an approach using conventional liquid chromatography (LC) by minimizing the amount of deuterium solvents used for separation. In the SFC separation, supercritical CO2 was used as a major component of the mobile phase, and methanol was used as a minor co-solvent. By using deuterated methanol (CH3OD), AP HDX was achieved during SFC separation. To prove the concept, thirty one nitrogen- and/or oxygen-containing standard compounds were analyzed by SFC-AP HDX MS. The compounds were successfully speciated from the obtained SFC-MS spectra. The exchange ions were observed with as low as 1% of CH3OD in the mobile phase, and separation could be performed within approximately 20 min using approximately 0.24 mL of CH3OD. The results showed that SFC separation and APPI/APCI HDX could be successfully performed using the suggested method. (C) 2016 Elsevier B.V. All rights reserved.</P>
Miniaturised dual-band implantable antenna for wireless biotelemetry
Cho, Y.,Yoo, H. IET 2016 Electronics letters Vol.52 No.12
<P>A miniaturised implantable antenna with dual-band operation the Medical Implant Communications Service (MICS) (402-405 MHz) and Industrial, Scientific, and Medical (ISM) (2400.0-2483.5 MHz) bands is presented. The size of the proposed antenna is 31.5 mm(3) (8.75 mm x 7.2 mm x 0.5 mm) which is the smallest size compared to previous implantable antennas. A serpentine-shaped radiating patch and open-end slot placed on the ground plane are used for miniaturisation. The performance of the antenna was evaluated from measurements and is based on good agreement with simulations.</P>
Adaptive live streaming system performance of MMT and DASH over a deployed LTE network
Cho, Y.,Park, S.,Kim, K.,Suh, D.Y. IET 2016 Electronics letters Vol.52 No.13
<P>Moving Picture Expert Group (MPEG) media transport and dynamic adaptive streaming over Hypertext Transfer Protocol are compared, which have been standardised by the MPEG for internet-based video services. Their performances as adaptive live streaming systems are evaluated over a deployed long term evolution network. The results provide their operational limitations and optimal operation parameters to improve resource usage and the quality of the users' experience.</P>
Cho, Y.,Challa, S.,Moquin, D.,Genga, R.,Ray, T.D.,Guildford, M.,Chan, F.K.M. Cell Press ; MIT Press 2009 Cell Vol.137 No.6
Programmed necrosis is a form of caspase-independent cell death whose molecular regulation is poorly understood. The kinase RIP1 is crucial for programmed necrosis, but also mediates activation of the prosurvival transcription factor NF-κB. We postulated that additional molecules are required to specifically activate programmed necrosis. Using a RNA interference screen, we identified the kinase RIP3 as a crucial activator for programmed necrosis induced by TNF and during virus infection. RIP3 regulates necrosis-specific RIP1 phosphorylation. The phosphorylation of RIP1 and RIP3 stabilizes their association within the pronecrotic complex, activates the pronecrotic kinase activity, and triggers downstream reactive oxygen species production. The pronecrotic RIP1-RIP3 complex is induced during vaccinia virus infection. Consequently, RIP3<SUP>-/-</SUP> mice exhibited severely impaired virus-induced tissue necrosis, inflammation, and control of viral replication. Our findings suggest that RIP3 controls programmed necrosis by initiating the pronecrotic kinase cascade, and that this is necessary for the inflammatory response against virus infections.
Profile decompositions of fractional Schrodinger equations with angularly regular data
Cho, Y.,Hwang, G.,Kwon, S.,Lee, S. Academic Press 2014 Journal of differential equations Vol.256 No.8
We study the fractional Schrodinger equations in R<SUP>1+d</SUP>, d≥3, of order d/(d-1)<α<2. Under the angular regularity assumption we prove linear and nonlinear profile decompositions which extend the previous results [9] to data without radial assumption. As applications we show blowup phenomena of solutions to mass-critical fractional Hartree equations.
Cho, Y.,Park, Y.,Choi, W. Korean Society of Industrial and Engineering Chemi 2008 Journal of industrial and engineering chemistry Vol.14 No.3
The sensitized dechlorination of CCl<SUB>4</SUB> in water was successfully demonstrated in the presence of nonionic surfactants (Brij-35) and ruthenium bipyridyl complexes [Ru<SUP>II</SUP>(bpy)<SUB>3</SUB>] under visible light illumination (λ>420nm). The ruthenium complex plays the role of a visible light sensitizer for this reductive conversion process, which is excited by absorbing visible light and subsequently transfers an electron to CCl<SUB>4</SUB>. The photoinduced electron transfers from the excited sensitizer to CCl<SUB>4</SUB> take place only in the presence of the surfactant, which concentrates both reactants within a micelle. The ruthenium sensitizer should be oxidized after transferring an electron to CCl<SUB>4</SUB>, but immediately regenerated by abstracting an electron from surrounding surfactant molecules. As a result, the ruthenium sensitizer acts as a photocatalyst with producing chlorides far above the stoichiometric concentration of the added sensitizer. The dechlorination rate was significantly reduced in the presence of dissolved oxygen, because the excited sensitizer is quenched by O<SUB>2</SUB>. With increasing each concentration of the surfactant, sensitizer, or CCl<SUB>4</SUB>, the corresponding CCl<SUB>4</SUB> dechlorination rate progressively increased, to reach a saturation at the concentration of 4.0g/L (surfactant), 5μM (sensitizer), or 30mM (CCl<SUB>4</SUB>), respectively. The visible light activity was strongly dependent on the kind of surfactants as well.
Analysis of dose-response to hexanal-induced gene expression in A549 human alveolar cells
Cho, Y.,Song, M. K.,Choi, H. S.,Ryu, J. C. Korean BioChip Society 2014 BioChip Journal Vol.8 No.2
The problems of analyzing dose effects on gene expression are gaining attention in toxicological research. Determining how gene expression profiles change with toxicant dose will improve the utility of arrays in identifying biomarkers and elucidating their modes of toxic action. In the present study, we focused on determining the dose-dependent alterations of gene expression profiles with hexanal exposure and we identified the possible biomarkers of hexanal in A549 human alveolar cells. A549 cells were exposed to a 5% inhibitory concentration (IC5) and a 20% inhibitory concentration (IC20) of hexanal for 48 h. Through microarray analysis using an oligonucleotide chip, we identified that the gene expression patterns were differentially shown in the control group and the hexanal-exposed groups. The hexanal-exposed groups are more sensitive to gene alteration than the control group, and gene expressions are more significantly altered in the IC20 exposure group than in the IC5 exposure group. With clustering analysis of gene expression profiles, we identified 2,929 IC5- and 3,678 IC20-specific genes, and 302 dose-dependently expressed genes. Gene ontology (GO) analysis with 246 annotated genes of the 302 dose-dependent expressed genes showed correlation with the key biological processes involved in neurological system processes, immune system development, cell activation, and cell-cell signaling. In conclusion, current study describes alterations in gene expression profiles in response to exposure to different doses of hexanal and related toxic pathways induced by significantly expressed genes. Moreover, novel genes and pathways that could potentially play a role in the prevention of respiratory disease due to aldehydes are identified.