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Baek, Nam-Seob,Kim, Yong-Hee,Roh, Soo-Gyun,Lee, Dong-Hyun,Seo, Kang-Deuk,Kim, Hwan-Kyu The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.9
A series of inert and photo-stable Er(III)-encapsulated complexes based on ${\pi}$-extended dendritic anthracene ligands bearing G3-aryl-ether dendron ([G3-AnX]-$CO_2H$), which retain different ${\pi}$-bridging systems, such as single (X= S), double (X= D) and triple (X= T) bonds was designed and synthesized to establish the structure-property relationship. The near infrared emission intensities of Er(III)-encapsulated complexes were enhanced dramatically by increasing the ${\pi}$-conjugated extension of anthracene ligands. The time-resolved luminescence spectra show monoexponential decays with a lifetime of $2.0{\sim}2.4ms$ for $Er^{3+}$ ions in thin films, and calculated intrinsic quantum yields of $Er^{3+}$ ions are in the range of $0.025{\sim}0.03%$. As a result, all Er(III)-encapsulated dendrimer complexes exhibit the near IR emission with the following order: $Er^{3+}-[G3-AnD]_3$(terpy) > $Er^{3+}-[G3-AnS]_3$(terpy) ${\approx}$ $Er^{3+}-[G3-AnT]_3$(terpy), because $Er^{3+}-[G3-AnD]_3$(terpy) has a higher relatively spectral overlap J value and energy transfer efficiency. In addition, the lack of detectable phosphorescence and no significant spectral dependence of the ${\pi}$-extended anthracene moieties on the solvent polarity support energy transfer from their singlet state to the central $Er^{3+}$ ion taking place in $Er^{3+}-[G3-AnX]_3$(terpy).
Analysis of gene expression during odontogenic differentiation of cultured human dental pulp cells
Seo, Min-Seock,Hwang, Kyung-Gyun,Kim, Hyong-Bum,Baek, Seung-Ho The Korean Academy of Conservative Dentistry 2012 Restorative Dentistry & Endodontics Vol.37 No.3
Objectives: We analyzed gene-expression profiles after 14 day odontogenic induction of human dental pulp cells (DPCs) using a DNA microarray and sought candidate genes possibly associated with mineralization. Materials and Methods: Induced human dental pulp cells were obtained by culturing DPCs in odontogenic induction medium (OM) for 14 day. Cells exposed to normal culture medium were used as controls. Total RNA was extracted from cells and analyzed by microarray analysis and the key results were confirmed selectively by reverse-transcriptase polymerase chain reaction (RT-PCR). We also performed a gene set enrichment analysis (GSEA) of the microarray data. Results: Six hundred and five genes among the 47,320 probes on the BeadChip differed by a factor of more than two-fold in the induced cells. Of these, 217 genes were upregulated, and 388 were down-regulated. GSEA revealed that in the induced cells, genes implicated in Apoptosis and Signaling by wingless MMTV integration (Wnt) were significantly upregulated. Conclusions: Genes implicated in Apoptosis and Signaling by Wnt are highly connected to the differentiation of dental pulp cells into odontoblast.
섬진강 하구역 지형변화에 따른 잘피 서식지의 분포 특성
백승균(Seung-Gyun Baek),서영교(Young Kyo Seo),김종규(Jongkyu Kim),김태정(Tae-Joung Kim) 전남대학교 수산과학연구소 2020 수산과학연구소논문집 Vol.28 No.2
Seagrass plays an important role and functions in coastal and estuarine ecosystems such as water quality improvement and coastal purification, coastal ecosystem feeding, spawning and growing place of fish. Recently, the changes of seawater flow and marine environment have occurred due to coastal reclamation and construction of artificial structures in Seomjin River estuary. Therefore, it is expected to affect the distribution of seagrass in the Seomjin River estuary. In order to reconstruct and manage the seagrass habitat in Seomjin River estuary, we investigated the spatial variation of seagrass habitat according to the coastal topographic changes using remote sensing data. We tried to extract coastline and boundaries of seagrass habitat from the satellite images and aerial photographs, and conduct overlay analysis to identify the changes in location and area of coastal topography and seagrass habitat.