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Choe, H.,Lee, S.H.,Kim, S.G.,Park, D.S.,Nasir, A.,Kim, K.M. Elsevier Science Publishers 2016 Journal of biotechnology Vol.218 No.-
<P>Pseudoalteromonas phenolica is a Gram-negative, rod-shaped, flagellated, aerobic, antibiotic-producing bacterium that was isolated from seawater off Ogasawara Island, Japan. Here, we report the complete genome of P. phenolica KCTC 12086(T) (= O-BC30(T)), which consists of 4,868,993 bp (G + C content of 40.6%) with two chromosomes, 4168 protein-coding genes, 113 tRNAs and 9 rRNA operons. In addition, several genes related to phenolic anti-methicillin-resistant Staphylococcus aureus substances were detected in the genome suggesting that biosynthesis of industrially important polybrominated aromatic compounds could be better understood with the availability of genome data of P. phenolica. (C) 2015 Elsevier B.V. All rights reserved.</P>
Choe, H.,Lee, D.H.,Kim, H.D.,Seo, I.W. Elsevier Science 2016 RENEWABLE & SUSTAINABLE ENERGY REVIEWS Vol.55 No.-
This paper identifies the structural properties of a technological knowledge network and the role of major organizations in the network, and analyzes actual contents of technological knowledge flows in terms of organization-technology linkage, by targeting the field of organic solar cells (OSC). Network analysis and matrix analysis methods are used to achieve these purposes. The results show the small-world effect exists in the technological knowledge network of OSCs, and the organizations with high betweenness centrality lead the technological knowledge flows. We also find technological knowledge in classes 136 and 313 flows relatively actively in key organizations@? network of OSCs. This means that technological knowledge regarding photoelectric batteries and electric lamp and discharge devices is mainly circulated between key organizations and indicates that the electronics or display sector will become a major consumer for early commercialization of OSCs. The target of analysis in this study is a patent citation network in the field of OSCs. Since we did not analyze all scientific publications, we cannot conclude that the results represent the entire flow of technological knowledge in that field. However, given that little attention has been paid to empirical studies of technological knowledge flows at the organizational level, this study makes an academic contribution by directly analyzing technological knowledge flows between organizations and presenting new taxonomic method based on centralities. The analytical process and methodology of this study, which include analysis of the structural properties of technological knowledge networks, matrix analysis and taxonomical grouping, and analysis of technological knowledge flows between key organizations, will be usefully applied to the analysis of technological knowledge networks in other fields.
Choe, H.,Lee, D. H. Springer Science + Business Media 2017 Scientometrics Vol.111 No.2
<P>This study is to examine the structure, characteristics, and change of a research collaboration network using co-assignee information of joint patents in Korea. The study was conducted in three stages: data collection, network construction, and network analysis. For network analysis, network topological analysis, node centrality analysis, and block modeling were performed in sequence. The analysis results revealed that the network has small-world properties. The results also showed that while government-sponsored research institutes (GRIs) played a role as a hub and bridge in the network in the early 2000s, universities gradually took their place to play a key role as a hub and bridge in the network. In addition, the block modeling analysis indicated that while, in the early 2000s, GRIcentered network density was shown to be high, the network density became concentrated around universities after 2004, and this tendency intensified after 2008. Bearing in mind a lack of empirical studies on inter-organizational research collaboration networks using patent data, this study made an academic contribution by specifically analyzing the structure and change of research collaboration networks by targeting Korea's major innovative actors. From the policy perspective, it provides important implications for figuring out the effects of university-industry-GRI (UIG) collaboration policies implemented so far, and can be of assistance for making evidence-based policies to build up a more effective UIG collaboration network or establish a new national science and technology innovation system.</P>
Formation, Manipulation, and Elasticity Measurement of a Nanometric Column of Water Molecules
Choe, H.,Hong, M.-H.,Seo, Y.,Lee, K.,Kim, G.,Cho, Y.,Ihm, J.,Jhe, W. American Physical Society 2005 Physical review letters Vol.95 No.18
<P>Nanometer-sized columns of condensed water molecules are formed by an atomic-resolution force microscope operated in ambient conditions. An unusual stepwise decrease of the force gradient associated with the ultrathin water bridge in the tip-substrate gap is observed during its stretch, exhibiting regularity in step heights (approximately 0.5 N/m) and plateau lengths (approximately 1 nm). Such 'quantized' elasticity is indicative of an atomic-scale stick slip at the tip-water interface. A thermodynamic-instability-induced rupture of the water meniscus (5 nm long and 2.6 nm wide) is also found. This work opens a high-resolution study of the structure and interface dynamics of a nanometric aqueous column.</P>
Oxytocin Mediates Entrainment of Sensory Stimuli to Social Cues of Opposing Valence
Choe, H.,Reed, M.,Benavidez, N.,Montgomery, D.,Soares, N.,Yim, Y.,Choi, Gloria B. Cell Press 2015 Neuron Vol.87 No.1
Meaningful social interactions modify behavioral responses to sensory stimuli. The neural mechanisms underlying the entrainment of neutral sensory stimuli to salient social cues to produce social learning remain unknown. We used odor-driven behavioral paradigms to ask if oxytocin, a neuropeptide implicated in various social behaviors, plays a crucial role in the formation of learned associations between odor and socially significant cues. Through genetic, optogenetic, and pharmacological manipulations, we show that oxytocin receptor signaling is crucial for entrainment of odor to social cues but is dispensable for entrainment to nonsocial cues. Furthermore, we demonstrate that oxytocin directly impacts the piriform, the olfactory sensory cortex, to mediate social learning. Lastly, we provide evidence that oxytocin plays a role in both appetitive and aversive social learning. These results suggest that oxytocin conveys saliency of social stimuli to sensory representations in the piriform cortex during odor-driven social learning.
Choe, H.,Kim, S.,Oh, J.,Nasir, A.,Kim, B.K.,Kim, K.M. Elsevier Publishing Services 2015 Marine genomics Vol.24 No.3
Kangiella geojedonensis KCTC 23420<SUP>T</SUP> is an aerobic, Gram-negative, non-motile, non-spore-forming, rod-shaped bacterium that was isolated from seawater off the southern coast of Korea. We here report the complete genome of K. geojedonensis KCTC 23420<SUP>T</SUP>, which consists of 2,495,242bp (G+C content of 43.78%) with 2,257 protein-coding genes, 41 tRNAs, 2 rRNA operons. The genome is smaller than the other closely related genomes, indicating that K. geojedonensis has recently experienced reductive evolution.