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Han, Ah-Reum,Kim, Jongtae,Yang, Il-Hyung The Korean Association Of Orthodontists 2021 대한치과교정학회지 Vol.51 No.1
Objective: The aim of this study was to evaluate the correlation between the vertical position of maxillary first molar and vertical skeletal measurements in lateral cephalograms by using new linear measurements on the vertical axis of coordinates with calibration. Methods: The vertical position of maxillary first molar (U6-SN), and the conventionally used variables (ConV) and the newly derived linear variables (NwLin) for vertical skeletal patterns were measured in the lateral cephalograms of 103 Korean adults with normal occlusions. Pearson correlation analyses and multiple linear regression analyses were performed with and without calibration using the anterior and posterior cranial base (ACB and PCB, respectively) lengths to identify variables related to U6-SN. Results: The PCB-calibrated statistics showed the best power of explanation. ConV indicating skeletal hyperdivergency was significantly correlated with U6-SN. Six NwLin regarding the position of palatal plane were positively correlated with U6-SN. Each multiple linear regression analysis generated a two-variable model: sella and nasion to palatal plane. Among the three models, the PCB-calibrated model yielded highest adjusted R2 value, 0.880. Conclusions: U6-SN could be determined by the vertical position of the maxilla, which could then be used to plan the amount of molar intrusion and estimate its clinical stability. Cephalometric calibration on the vertical axis of coordinates by using PCB for vertical linear measurements could strengthen the analysis itself.
Effect of Color Changes of Naturally Colored Organic Cotton Fibers on Human Sensory Perception
Han, Ah-Reum,Chae, Young-Joo,Lee, Myung-Eun,Cho, Gil-Soo THE KOREAN FIBER SOCIETY 2011 FIBERS AND POLYMERS Vol.12 No.7
This study aims to investigate the color changes of Naturally Colored Organic Cotton (NaCOC) fibers after scouring, and to evaluate the human sensory perception for the fibers. Furthermore, it tries to observe the relationship between the color coordinates and the sensory perception. Three colors (ivory, coyote-brown, green) of NaCOC fibers were scoured under four different treatments (boiling water, enzyme, sodium carbonate, sodium hydroxide). The color coordinates (L, a, b) were measured in CIELAB using spectrophotometer (SP62, X-Rite), and color differences (${\Delta}L$, ${\Delta}a$, ${\Delta}b$, ${\Delta}E$) were calculated. Human sensory perception for the NaCOCs was evaluated by 27 female participants. The questionnaire consisted of nine pairs of bipolar visual sensory adjectives using the SDS. The values of L and b fell, while the value of a arose after scouring in general. The value of ${\Delta}E$ was the highest when treated with alkali solutions among all treatments. Human sensory perception such as brightness, clearness, lightness and freshness generally decreased, while vividness and strength increased. The meaningful color factors to predict brightness, lightness were L and ${\Delta}L$, and those to predict vividness and strength sensory were ${\Delta}L$.
Identification of a New Fatty Acid from the Seeds of Coix lachryma-jobi var. ma-yuen
Han, Ah-Reum,Kil, Yun-Seo,Kang, Unwoo,Youn, I-Soo,Choi, Goeun,Lee, Yoo Jin,Nam, Joo-Won,Lee, Je-Hyun,Hong, Jongki,Lee, Sang Kook,Seo, Eun-Kyoung Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.4
( Ah Reum Han ),( Young Sook Paik ) 한국응용생명화학회(구 한국농화학회) 2012 Journal of Applied Biological Chemistry (J. Appl. Vol.55 No.3
Four chromone derivatives (1-4) were isolated from the clove buds (Syzygium aromaticum). Of these, two chromone C-glucosides (1 and 2) showed significant PEP inhibition withIC50 values of 1.48±0.02 and 1.74±0.03qM and Ki values of0.27±0.02 and 0.50±0.05qM, respectively. They also exhibited strong antioxidant capacities against the 2, 2`-azinobis (3-ethyl-benzothiazoline-6-sulfonic acid diammonium salt radical system with EC50 values of 4.13±0.04 and 4.79±0.03uM, respectively.
A New Flavanone Glycoside from the Dried Immature Fruits of Poncirus trifoliata
HAN, Ah-Reum,KIM, Jong-Bin,LEE, Jun,NAM, Joo-Won,LEE, Ik-Soo,SHIM, Chang-Koo,LEE, Kyung-Tae,SEO, Eun-Kyoung 이화여자대학교 약학연구소 2008 藥學硏究論文集 Vol.- No.18
A new flavanone glycoside, (2R)-5-hydroxy-4'-methoxyflavanone-7-0-{β-glucopyranosyl-(1->2)-β-glucopyranoside} (1), was isolated from the EtOAc extract of dried immature fruit of Poncirus trifoliata, together with three known compounds, (2S)-poncirin (2), (2S)-naringin (3), and (2S)-poncirenin (4). The structure of compound 1 was elucidated by spectroscopic data analysis, including 1D and 2D NMR experiments. Among the isolates, compound 2 exhibited considerable inhibitory activity against lipopolysaccharide (LPS)-induced prostaglandin E₂ (PGE₂) and interleukin-6 (IL-6) production, and mRNA expression in RAW 264.7 murine macrophage cells.
Han, Ah-reum,Kang, Hye-Ri,Son, Jonghyeon,Kwon, Do Hoon,Kim, Sulhee,Lee, Woo Cheol,Song, Hyun Kyu,Song, Moon Jung,Hwang, Kwang Yeon Oxford University Press 2016 Nucleic acids research Vol.44 No.19
<P>GTP and branched-chain amino acids (BCAAs) are metabolic sensors that are indispensable for the determination of the metabolic status of cells. However, their molecular sensing mechanism remains unclear. CodY is a unique global transcription regulator that recognizes GTP and BCAAs as specific signals and affects expression of more than 100 genes associated with metabolism. Herein, we report the first crystal structures of the full-length CodY complex with sensing molecules and describe their functional states. We observed two different oligomeric states of CodY: a dimeric complex of CodY from <I>Staphylococcus aureus</I> with the two metabolites GTP and isoleucine, and a tetrameric form (apo) of CodY from <I>Bacillus cereus</I>. Notably, the tetrameric state shows in an auto-inhibitory manner by blocking the GTP-binding site, whereas the binding sites of GTP and isoleucine are clearly visible in the dimeric state. The GTP is located at a hinge site between the long helical region and the metabolite-binding site. Together, data from structural and electrophoretic mobility shift assay analyses improve understanding of how CodY senses GTP and operates as a DNA-binding protein and a pleiotropic transcription regulator.</P>
Han, Ah-reum,Kim, Moon-Jung,Kwak, Geun-Hee,Son, Jonghyeon,Hwang, Kwang Yeon,Kim, Hwa-Young American Chemical Society 2016 Biochemistry Vol.55 No.36
<P>Many bacteria, particularly pathogens, possess methionine sulfoxide reductase A (MsrA) and B (MsrB) as a fusion form (MsrAB). However, it is not clear why they possess a fusion MsrAB form rather than the separate,enzymes that exist in most organisms. In this study, we performed biochemical and kinetic analyses of MsrAB from Treponema denticola (TdMsrAB), single-domain forms (TdMsrA and TdMsrB), and catalytic Cys mutants (TdMsrAB(C11S) and TdMsrAB(C285S)) We found that the catalytic efficiency of both MsrA and MsrB increased after fusion of the domains and that the linker region (iloop) that connects TdMsrA and TdMsrB is required for the higher catalytic efficiency of TdMsrAB. We also determined the crystal structure of TdMsrAB at 2.3 angstrom, showing that the iloop mainly interacts with TdMsrB via hydrogen bonds. Further kinetic analysis using the iloop mutants revealed that the iloop-TdMsrB interactions are critical to MsrB and MsrA activities. We also report the structure in which an oxidized form of dithiothreitol, an in vitro reductant for MsrA and MsrB, is present in the active site of TdMsrA. Collectively, the results of this study reveal an essential role of the iloop in maintaining the higher catalytic efficiency of the MsrAB fusion enzyme and provide a better understanding of why the MsrAB enzyme exists as a fused form.</P>
A New Flavanone Glycoside from the Dried Immature Fruits of <i>Poncirus trifoliata</i>
Han, Ah-Reum,Kim, Jong-Bin,Lee, Jun,Nam, Joo-Won,Lee, Ik-Soo,Shim, Chang-Koo,Lee, Kyung-Tae,Seo, Eun-Kyoung Pharmaceutical Society of Japan 2007 Chemical & pharmaceutical bulletin Vol.55 No.8
<P>A new flavanone glycoside, (2<I>R</I>)-5-hydroxy-4′-methoxyflavanone-7-<I>O</I>-{β-glucopyranosyl-(1→2)-β-glucopyranoside} (1), was isolated from the EtOAc extract of dried immature fruit of <I>Poncirus trifoliata</I>, together with three known compounds, (2<I>S</I>)-poncirin (2), (2<I>S</I>)-naringin (3), and (2<I>S</I>)-poncirenin (4). The structure of compound 1 was elucidated by spectroscopic data analysis, including 1D and 2D NMR experiments. Among the isolates, compound 2 exhibited considerable inhibitory activity against lipopolysaccharide (LPS)-induced prostaglandin E<SUB>2</SUB> (PGE<SUB>2</SUB>) and interleukin-6 (IL-6) production, and mRNA expression in RAW 264.7 murine macrophage cells.</P>