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      • KCI등재

        The contested terrain of sport diplomacy in a globalizing world

        Steven J. Jackson1 한국외국어대학교 국제지역연구센터 2013 International Area Studies Review Vol.16 No.3

        Sport continues to occupy a rather ambiguous position within the context of politics, foreign policy and diplomatic relations. While one can identify a long list of cases where sport has been credited with diverting conflict, contributing to peace negotiations and helping develop better cultural understanding, there are also many cases where sport has not only fueled conflict but also served as its source. This paper seeks to: (1) highlight the unique features of sport as a cultural site and practice in relation to diplomacy; (2) briefly overview some key dimensions and limitations of sport as an instrument of diplomacy; and (3) offer a preliminary examination of contemporary sport organizations and events in order to understand the implications of the transformational shift occurring between state diplomacy and what might be termed “corporate diplomacy” within an increasingly global context.

      • SCISCIESCOPUS

        Subcellular Localization of the Barley Stripe Mosaic Virus Triple Gene Block Proteins

        Lim, Hyoun-Sub,Bragg, Jennifer N.,Ganesan, Uma,Ruzin, Steven,Schichnes, Denise,Lee, Mi Yeon,Vaira, Anna Maria,Ryu, Ki Hyun,Hammond, John,Jackson, Andrew O. American Society for Microbiology 2009 Journal of virology Vol.83 No.18

        <B>ABSTRACT</B><P><I>Barley stripe mosaic virus</I> (BSMV) spreads from cell to cell through the coordinated actions of three triple gene block (TGB) proteins (TGB1, TGB2, and TGB3) arranged in overlapping open reading frames (ORFs). Our previous studies (D. M. Lawrence and A. O. Jackson, J. Virol. 75:8712-8723, 2001; D. M. Lawrence and A. O. Jackson, Mol. Plant Pathol. 2:65-75, 2001) have shown that each of these proteins is required for cell-to-cell movement in monocot and dicot hosts. We recently found (H.-S. Lim, J. N. Bragg, U. Ganesan, D. M. Lawrence, J. Yu, M. Isogai, J. Hammond, and A. O. Jackson, J. Virol. 82:4991-5006, 2008) that TGB1 engages in homologous interactions leading to the formation of a ribonucleoprotein complex containing viral genomic and messenger RNAs, and we have also demonstrated that TGB3 functions in heterologous interactions with TGB1 and TGB2. We have now used <I>Agrobacterium tumefaciens</I>-mediated protein expression in <I>Nicotiana benthamiana</I> leaf cells and site-specific mutagenesis to determine how TGB protein interactions influence their subcellular localization and virus spread. Confocal microscopy revealed that the TGB3 protein localizes at the cell wall (CW) in close association with plasmodesmata and that the deletion or mutagenesis of a single amino acid at the immediate C terminus can affect CW targeting. TGB3 also directed the localization of TGB2 from the endoplasmic reticulum to the CW, and this targeting was shown to be dependent on interactions between the TGB2 and TGB3 proteins. The optimal localization of the TGB1 protein at the CW also required TGB2 and TGB3 interactions, but in this context, site-specific TGB1 helicase motif mutants varied in their localization patterns. The results suggest that the ability of TGB1 to engage in homologous binding interactions is not essential for targeting to the CW. However, the relative expression levels of TGB2 and TGB3 influenced the cytosolic and CW distributions of TGB1 and TGB2. Moreover, in both cases, localization at the CW was optimal at the 10:1 TGB2-to-TGB3 ratios occurring in virus infections, and mutations reducing CW localization had corresponding effects on BSMV movement phenotypes. These data support a model whereby TGB protein interactions function in the subcellular targeting of movement protein complexes and the ability of BSMV to move from cell to cell.</P>

      • Compensatory Neural Reorganization in Tourette Syndrome

        Jackson, Stephen ,R.,Parkinson, Amy,Jung, Jeyoung,Ryan, Suzanne ,E.,Morgan, Paul ,S.,Hollis, Chris,Jackson, Georgina ,M. Cell Press 2011 Current biology Vol.21 No.7

        <P><B>Summary</B></P><P>Children with neurological disorders may follow unique developmental trajectories whereby they undergo compensatory neuroplastic changes in brain structure and function that help them gain control over their symptoms [1–6]. We used behavioral and brain imaging techniques to investigate this conjecture in children with Tourette syndrome (TS). Using a behavioral task that induces high levels of intermanual conflict, we show that individuals with TS exhibit enhanced control of motor output. Then, using structural (diffusion-weighted imaging) brain imaging techniques, we demonstrate widespread differences in the white matter (WM) microstructure of the TS brain that include alterations in the corpus callosum and forceps minor (FM) WM that significantly predict tic severity in TS. Most importantly, we show that task performance for the TS group (but not for controls) is strongly predicted by the WM microstructure of the FM pathways that lead to the prefrontal cortex and by the functional magnetic resonance imaging blood oxygen level-dependent response in prefrontal areas connected by these tracts. These results provide evidence for compensatory brain reorganization that may underlie the increased self-regulation mechanisms that have been hypothesized to bring about the control of tics during adolescence.</P>

      • KCI등재
      • Neural integration of information specifying human structure from form, motion, and depth.

        Jackson, Stuart,Blake, Randolph The Society 2010 The Journal of neuroscience Vol.30 No.3

        <P>Recent computational models of biological motion perception operate on ambiguous two-dimensional representations of the body (e.g., snapshots, posture templates) and contain no explicit means for disambiguating the three-dimensional orientation of a perceived human figure. Are there neural mechanisms in the visual system that represent a moving human figure's orientation in three dimensions? To isolate and characterize the neural mechanisms mediating perception of biological motion, we used an adaptation paradigm together with bistable point-light (PL) animations whose perceived direction of heading fluctuates over time. After exposure to a PL walker with a particular stereoscopically defined heading direction, observers experienced a consistent aftereffect: a bistable PL walker, which could be perceived in the adapted orientation or reversed in depth, was perceived predominantly reversed in depth. A phase-scrambled adaptor produced no aftereffect, yet when adapting and test walkers differed in size or appeared on opposite sides of fixation aftereffects did occur. Thus, this heading direction aftereffect cannot be explained by local, disparity-specific motion adaptation, and the properties of scale and position invariance imply higher-level origins of neural adaptation. Nor is disparity essential for producing adaptation: when suspended on top of a stereoscopically defined, rotating globe, a context-disambiguated 'globetrotter' was sufficient to bias the bistable walker's direction, as were full-body adaptors. In sum, these results imply that the neural signals supporting biomotion perception integrate information on the form, motion, and three-dimensional depth orientation of the moving human figure. Models of biomotion perception should incorporate mechanisms to disambiguate depth ambiguities in two-dimensional body representations.</P>

      • Discrete geometry optimization for reducing flow non-uniformity, asymmetry, and parasitic minor loss pressure drops in Z-type configurations of fuel cells

        Jackson, J.M.,Hupert, M.L.,Soper, S.A. Elsevier Sequoia 2014 Journal of Power Sources Vol.269 No.-

        Parallel channel configurations, such as Z-type, used to distribute reagents in planar fuel cells provide lower overall pressure drop as compared to other channel designs. However, due to their inherent characteristics, flow maldistribution in parallel configurations is commonly observed and leads to starvation of reagents in middle channels. In addition, the Reynolds number dependent minor losses at branching tee junctions may cause asymmetric flow non-uniformity and reagent imbalance between the cathode and anode. Herein, we present a universal and simple optimization method to simultaneously reduce flow maldistribution, asymmetry, and parasitic pressure in Z-type parallel configurations of fuel cells or fuel cell stacks that has improved scalability relative to previous methods. A discrete model's governing equations were reduced to yield geometric ratios between headers. Increasing header widths to satisfy these ratios reduced flow maldistribution without modifying parallel channel geometry as validated by computation fluid dynamics (CFD) simulations. Furthermore, decreased Reynolds numbers throughout the headers reduced minor pressure drops and flow distribution asymmetry. We offer several methods to reduce the optimized geometry's footprint, including an adaptation of the discontinuous design.

      • UV activation of polymeric high aspect ratio microstructures: ramifications in antibody surface loading for circulating tumor cell selection

        Jackson, J.,Witek, M.,Hupert, M.,Brady, C.,Pullagurla, S.,Kamande, J.,Aufforth, R.,Tignanelli, C.,Torphy, R.,Yeh, J. Royal Society of Chemistry 2014 Lab on a chip Vol.14 No.1

        The need to activate thermoplastic surfaces using robust and efficient methods has been driven by the fact that replication techniques can be used to produce microfluidic devices in a high production mode and at low cost, making polymer microfluidics invaluable for in vitro diagnostics, such as circulating tumor cell (CTC) analysis, where device disposability is critical to mitigate artifacts associated with sample carryover. Modifying the surface chemistry of thermoplastic devices through activation techniques can be used to increase the wettability of the surface or to produce functional scaffolds to allow for the covalent attachment of biologics, such as antibodies for CTC recognition. Extensive surface characterization tools were used to investigate UV activation of various surfaces to produce uniform and high surface coverage of functional groups, such as carboxylic acids in microchannels of different aspect ratios. We found that the efficiency of the UV activation process is highly dependent on the microchannel aspect ratio and the identity of the thermoplastic substrate. Colorimetric assays and fluorescence imaging of UV-activated microchannels following EDC/NHS coupling of Cy3-labeled oligonucleotides indicated that UV-activation of a PMMA microchannel with an aspect ratio of similar to 3 was significantly less efficient toward the bottom of the channel compared to the upper sections. This effect was a consequence of the bulk polymer's damping of the modifying UV radiation due to absorption artifacts. In contrast, this effect was less pronounced for COC. Moreover, we observed that after thermal fusion bonding of the device's cover plate to the substrate, many of the generated functional groups buried into the bulk rendering them inaccessible. The propensity of this surface reorganization was found to be higher for PMMA compared to COC. As an example of the effects of material and microchannel aspect ratios on device functionality, thermoplastic devices for the selection of CTCs from whole blood were evaluated, which required the immobilization of monoclonal antibodies to channel walls. From our results, we concluded the CTC yield and purity of isolated CTCs were dependent on the substrate material with COC producing the highest clinical yields for CTCs as well as better purities compared to PMMA.

      • Sequencing crop genomes: approaches and applications

        Jackson, Scott A.,Iwata, Aiko,Lee, Suk‐,Ha,Schmutz, Jeremy,Shoemaker, Randy Blackwell Publishing Ltd 2011 The New phytologist Vol.191 No.4

        <P><B>Contents</B></P><P> <tabularFixed><table frame='none'><tgroup cols='3' align='left'><colspec colname='col1' colnum='1'/><colspec colname='col2' colnum='2'/><colspec colname='col3' colnum='3'/><tbody valign='top'><row><entry/><entry>Summary</entry><entry>915</entry></row><row><entry>I.</entry><entry>Genomics and crop improvement</entry><entry>915</entry></row><row><entry>II.</entry><entry>Complexity of plant genomes</entry><entry>916</entry></row><row><entry>III.</entry><entry>Evolution of genome sequencing</entry><entry>917</entry></row><row><entry>IV.</entry><entry>Future of genome sequencing</entry><entry>919</entry></row><row><entry>V.</entry><entry>Application of genomics for crop improvement</entry><entry>920</entry></row><row><entry>VI.</entry><entry>Unlocking the potential of genetic diversity through genomic   approaches</entry><entry>922</entry></row><row><entry/><entry>Acknowledgements</entry><entry>923</entry></row><row><entry/><entry>References</entry><entry>923</entry></row></tbody></tgroup></table></tabularFixed> </P><P><B>Summary</B></P><P>Many challenges face plant scientists, in particular those working on crop production, such as a projected increase in population, decrease in water and arable land, changes in weather patterns and predictability. Advances in genome sequencing and resequencing can and should play a role in our response to meeting these challenges. However, several barriers prevent rapid and effective deployment of these tools to a wide variety of crops. Because of the complexity of crop genomes, <I>de novo</I> sequencing with next‐generation sequencing technologies is a process fraught with difficulties that then create roadblocks to the utilization of these genome sequences for crop improvement. Collecting rapid and accurate phenotypes in crop plants is a hindrance to integrating genomics with crop improvement, and advances in informatics are needed to put these tools in the hands of the scientists on the ground.</P>

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