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Kim, E.,Lee, H. Elsevier Sequoia [etc.] 2013 Inorganica chimica acta Vol.399 No.-
New nickel(II) complexes A and B having macrocyclic ligands 4,10-dimethyl-2,12-diphenyl-1,5,9,13-dimethylbenzotetraazacyclo[15]tetradecine and 4,10-dimethyl-2,12-diphenyl-1,5,9,13-nitrobenzotetraazacyclo[15]tetradecine, respectively, have been synthesized and characterized by spectroscopic methods, including single-crystal X-ray diffraction. The nickel and four nitrogen atoms in both of the unsymmetrical tetraaza[15]annulene-ligated complexes have a slightly distorted square-planar arrangement rather than a square-pyramidal one, despite ring strain from coordination with the propylenediamine group.
Tooth survival and periodontal tissues healing of allogenic-transplanted teeth in the mice
Kim, E,Cho, SW,Yang, JY,Cai, J,Lee, SJ,Ohshima, H,Jung, HS Blackwell Publishing Ltd 2006 Oral diseases Vol.12 No.4
<P>Objective: </P><P>For the successful organ transplantation, immune rejection has to be considered. Autogenic transplantation of human teeth is generally carried out free of clinical difficulty because of the lack of immune reaction, whereas allogenic tooth transplantations easily induce host immune rejection to donor tissues. The aim of the present study was to evaluate the replacement of donor tissue by host cells after allogenic tooth transplantation</P><P>Materials and methods: </P><P>First molars extracted from <I>lacZ</I> transgenic ROSA26 mice were transplanted into the alveolar socket and the tongue of host wildtype mice, where the first molar had existed.</P><P>Results: </P><P>Donor cells from <I>lacZ</I> transgenic mice were not detected in the periodontal ligament space, but rather in the pulp chamber of the donor tooth. Furthermore, if the pulp chamber was widely open to an affluent blood supply, odontoblasts and fibroblasts in the donor tissue survived in the dental pulp.</P><P>Conclusions: </P><P>Our experimental models using <I>lacZ</I> transgenic ROSA26 mice clearly demonstrate that donor periodontal tissue cells are replaced by host cells and that periodontal tissue can regenerate after allogenic tooth transplantation. Furthermore, our models suggest that donor pulpal cells can survive if the vascular supply into the pulp chamber is sufficient.</P>
Morphological brain network assessed using graph theory and network filtration in deaf adults
Kim, E.,Kang, H.,Lee, H.,Lee, H.J.,Suh, M.W.,Song, J.J.,Oh, S.H.,Lee, D.S. Elsevier/North-Holland, Biomedical Press ; Elsevie 2014 Hearing research Vol.315 No.-
Prolonged deprivation of auditory input can change brain networks in pre- and postlingual deaf adults by brain-wide reorganization. To investigate morphological changes in these brains voxel-based morphometry, voxel-wise correlation with the primary auditory cortex, and whole brain network analyses using morphological covariance were performed in eight prelingual deaf, eleven postlingual deaf, and eleven hearing adults. Network characteristics based on graph theory and network filtration based on persistent homology were examined. Gray matter density in the primary auditor cortex was preserved in prelingual deafness, while it tended to decrease in postlingual deafness. Unlike postlingual, prelingual deafness showed increased bilateral temporal connectivity of the primary auditory cortex compared to the hearing adults. Of the graph theory-based characteristics, clustering coefficient, betweenness centrality, and nodal efficiency all increased in prelingual deafness, while all the parameters of postlingual deafness were similar to the hearing adults. Patterns of connected components changing during network filtration were different between prelingual deafness and hearing adults according to the barcode, dendrogram, and single linkage matrix representations, while these were the same in postlingual deafness. Nodes in fronto-limbic and left temporal components were closely coupled, and nodes in the temporo-parietal component were loosely coupled, in prelingual deafness. Patterns of connected components changing in postlingual deafness were the same as hearing adults. We propose that the preserved density of auditory cortex associated with increased connectivity in prelingual deafness, and closer coupling between certain brain areas, represent distinctive reorganization of auditory and related cortices compared with hearing or postlingual deaf adults. The differential network reorganization in the prelingual deaf adults could be related to the absence of auditory speech experience.
Kim, E.,Lee, H.,Noh, T.H.,Lee, Y.A.,Jung, O.S. Elsevier 2014 INORGANIC CHEMISTRY COMMUNICATIONS Vol.46 No.-
Self-assembly of AgX (X<SUP>-</SUP>=ClO<SUB>4</SUB><SUP>-</SUP> and PF<SUB>6</SUB><SUP>-</SUP>) with a C<SUB>3</SUB>-tridentate ligand in EtOH/CH<SUB>2</SUB>Cl<SUB>2</SUB> affords a ligand-eclipsed double chain whereas the cognate reaction in H<SUB>2</SUB>O/MeOH produces a ligand-staggered chain consisting of alternate cyclic and bridging moieties. The anion exchangeability and photoluminescence properties are significantly affected by the different skeletal structures.