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Expression of the mexA Gene Requires the DNA Helicase RecG in Pseudomonas aeruginosa PAO1
( Aram Heo ),( Woo Jun Park ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.4
This study provides evidence that RecG regulates the expression of the OxyR-independent gene mexA in Pseudomonas aeruginosa PAO1. A reduction in mexA expression was observed in the absence of RecG, but not OxyR, by northern blot and quantitative real-time PCR analyses. The canonical palindromic RecG binding sequence was present upstream of the mexA promoter, and bound purified RecG and single strand-binding protein. These data reveal a novel mechanism of OxyR-independent gene transcription by RecG.
강준치(Erythroculter erythropterus)에서 분리된 조충의 분자생물학적 동정
허아람(Aram HEO),이남실(Nam-Sil LEE),김광일(KwangIl KIM),김나영(Na Young KIM),정승희(Sung-Hee JUNG),김명석(Myoung Sug KIM) 한국수산해양교육학회 2018 水産海洋敎育硏究 Vol.30 No.6
The cestoda was isolated from abdominal cavity of dead Erythroculter erythropterus in Nakdong River, Chilgok, Korea at 2016. Abdominal cavity of E. erythropterus was filled with three or four cestodas. They were ivory color and long tapeworm shapes. Molecular identification of the cestoda was performed using analysis of the 18s rRNA gene sequence. Alignment analysis reveal that sequence similarities with Digramma interrupta(accession number : AF254122) was 99.6%. This report is the first case of D. interrupta infection in E. erythropterus in Korea.
Fluorescence-detected circular dichroism spectroscopy of jet-cooled ephedrine
Hong, Aram,Jeong, Changseop,Jang, Heeseon,Choi, Myoung Choul,Heo, Jiyoung,Kim, Nam Joon The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.11
<P>The resonant two-photon ionization circular dichroism (R2PICD) spectrum represents the cumulative circular dichroism (CD) of one-photon excitation and the subsequent one-photon ionization, whereas the fluorescence-detected circular dichroism (FDCD) spectra exhibit only the CD of one-photon excitation, similar to conventional CD spectra. We obtained the FDCD spectra of jet-cooled ephedrine (EPD) near the origin band of the S-0-S-1 transition to measure the CD of one-photon absorption and thus the CD of the ionization process in R2PI in comparison with the R2PICD spectra. The CD effects of the ionization following excitation of the A (0-0) and C (930 cm(-1)) bands in the spectrum are small, whereas those of the B band (530 cm(-1)) are anomalously large, leading to opposite CD signs for the FDCD and R2PICD spectra. Based on the intermediate state-selective fragmentation patterns in the R2PI spectra, this large CD effect is attributed to the state-selective isomerization that occurs after excitation of the B band. By comparing the experimental and theoretical spectra, we determined that the B band corresponds to an asymmetric ring distortion mode that involves torsional motions of the side chain, which may facilitate the isomerization process. This study demonstrates that FDCD spectroscopy combined with R2PICD spectroscopy provides a powerful tool to measure the CD effects of the excitation and ionization processes separately in R2PI and thus probe the structural changes that occur during the ionization process following excitation to an intermediate state.</P>
Conformation‐Specific Circular Dichroism Spectroscopy of Cold, Isolated Chiral Molecules
Hong, Aram,Choi, Chang Min,Eun, Han Jun,Jeong, Changseop,Heo, Jiyoung,Kim, Nam Joon WILEY‐VCH Verlag 2014 Angewandte Chemie Vol.126 No.30
<P><B>Abstract</B></P><P>The CD spectroscopy of a chiral compound in solution yields an average CD value derived from all of the conformations of a chiral molecule. By contrast, CD spectroscopy of cold chiral molecules in the gas phase distinguishes specific conformers of a chiral molecule, but the weak CD effect has limited the practical application of this technique. Reported herein is the first resonant two‐photon ionization CD spectra of ephedrines in a supersonic jet using circularly polarized laser pulses, which were generated by synchronizing the oscillation of the photoelastic modulator with the laser firing. The spectra exhibited well‐resolved CD bands which were specific for the conformations and vibrational modes of each enantiomer. The CD signs and magnitudes of the jet‐cooled chiral molecules were very sensitive to their conformations and thus offered crucial information for determining the three‐dimensional structures of chiral species, as conducted in combination with quantum chemical calculations.</P>
Paeoniae radis alba mediated alleviation of atopic dermatitis like immune alterations in mice (II)
Yong Heo,Ji Youn Kim,Kyeong Uk Yeo,So Ryeon Hwang,ARam Kim,Ji Hyun Yu,Jae Hee Lee,Na Ri Seo,Ah Rang Jo,Ye Soul Jeon,So Jung Sin,Hyung Jun Kim,Byung Ki Song,Jong Suek Shin 한국실험동물학회 2012 한국실험동물학회 학술발표대회 논문집 Vol.2012 No.8
Seeun Kwon,Aram Heo,Sungwook Chun 대한산부인과학회 2023 Obstetrics & Gynecology Science Vol.66 No.4
Objective We aimed to evaluate whether triglyceride and glucose (TyG) indices are useful in identifying insulin sensitivity/resistance in women with polycystic ovary syndrome (PCOS). Methods One hundred and seventy-two Korean women aged 18-35 years who were diagnosed with PCOS were included in this study. Fasting-state insulin sensitivity assessment indices (ISAIs) derived from a combination of fasting insulin and glucose levels were calculated for all study participants, and abnormal insulin sensitivity was defined as any of the evaluated ISAIs being out of the established normal range. Correlation analysis was conducted to assess the relationship between the TyG index and other clinical and biochemical parameters. Receiver operating characteristic (ROC) curve analysis was used to determine the optimal cutoff value of the TyG index for identifying abnormal insulin sensitivity, and unpaired t-tests were used to compare biochemical parameters between individuals with a TyG index below the cutoff and individuals with a TyG index above the cutoff value. Results All clinical parameters, except age and other insulin resistance-related biochemical parameters, were significantly related to the TyG index. The ROC curve analysis revealed an optimal TyG cutoff value of 8.126 (sensitivity, 0.807; specificity, 0.683) for identifying abnormal insulin sensitivity. In the comparative analysis, all ISAIs and parameters derived from the lipid profiles differed significantly between the TyG groups. Conclusion The TyG index is a feasible surrogate marker for predicting insulin sensitivity/resistance in women with PCOS.
Park, Ji Chan,Heo, Eunjung,Kim, Aram,Kim, Mijong,Park, Kang Hyun,Song, Hyunjoon American Chemical Society 2011 The Journal of Physical Chemistry Part C Vol. No.
<P>In the present study, we optimize the yolk–shell nanostructure in a palladium–silica system for the purpose of attaining high activity in Suzuki cross-coupling reactions. Pd@porous SiO<SUB>2</SUB> (Pd@pSiO<SUB>2</SUB>) yolk–shell nanoparticles, bearing tiny palladium cores and highly porous silica hollow shells, were synthesized by direct silica coating and partial etching of the silica layers. High temperature treatment removed all surfactants around the catalyst surface and generated large pores on the silica shells. The resulting Pd@pSiO<SUB>2</SUB> yolk–shell catalysts exhibited extremely high initial turnover frequency of 78000 h<SUP>–1</SUP>, as well as excellent reusability of more than 10 times in a standard Suzuki coupling reaction. The catalysts also catalyzed Suzuki reactions with various substrates including bromo- and chlorobenzene very well.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2011/jpccck.2011.115.issue-32/jp2021825/production/images/medium/jp-2011-021825_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp2021825'>ACS Electronic Supporting Info</A></P>
( Minkyung Cho ),( Suji Kim ),( Aram Heo ),( Seeun Kwon ),( Sungwook Chun ) 대한산부인과학회 2022 대한산부인과학회 학술대회 Vol.108 No.-
Objective: The aim of the present study was to evaluate the association between hematologic parameters related to systemic inflammation and insulin resistanceassociated metabolic parameters in women with polycystic ovary syndrome (PCOS). Methods: Eighty-two women aged 18 to 35 years who were diagnosed with PCOS were included in this study. A 2-hour 75g oral glucose tolerance test (OGTT) was performed on all study participants; fasting glucose and insulin levels and postprandial glucose and insulin levels were measured simultaneously during a 2-hour OGTT. Hematologic parameters were derived from a standard complete blood count and a differential count of fasting-state blood samples. The correlations between hematologic parameters and insulin resistanceassociated clinical and metabolic parameters were evaluated using Spearmans rank correlation and partial correlation coefficients. Unpaired t-test was used to compare hematologic parameters between the two groups categorized according to the presence or absence of insulin resistance. Results: Significant differences in the absolute neutrophil count, absolute monocyte count, platelet count, and neutrophil-lymphocyte ratio were found between the insulin resistant group and insulin non-resistant group. Correlation analysis found that all hematological parameters except for the platelet-lymphocyte ratio were associated with at least one or more insulin resistance-associated metabolic parameters. However, these significant correlations between hematological and metabolic parameters all but disappeared after controlling for the effects of other covariates using partial correlation analysis. Conclusion: The association between hematologic parameters indicative of systemic inflammation and insulin resistance-associated metabolic parameters in women with PCOS may be highly influenced by other anthropometric covariates.