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Park, Minjeong,Jeon, Yeji,Jang, Ho Hee,Ro, Hyun-Su,Park, Woojun,Madsen, Eugene L.,Jeon, Che Ok American Society for Microbiology 2007 Applied and environmental microbiology Vol.73 No.16
<B>ABSTRACT</B><P>Prior research revealed that <I>Polaromonas naphthalenivorans</I> CJ2 carries and expresses genes encoding the gentisate metabolic pathway for naphthalene. These metabolic genes are split into two clusters, comprising <I>nagRAaGHAbAcAdBFCQEDJI</I>′-<I>orf1</I>-<I>tnpA</I> and <I>nagR2</I>-<I>orf2I</I>″<I>KL</I> (C. O. Jeon, M. Park, H. Ro, W. Park, and E. L. Madsen, Appl. Environ. Microbiol. 72:1086-1095, 2006). BLAST homology searches of sequences in GenBank indicated that the <I>orf2</I> gene from the small cluster likely encoded a salicylate 5-hydroxylase, presumed to catalyze the conversion of salicylate into gentisate. Here, we report physiological and genetic evidence that <I>orf2</I> does not encode salicylate 5-hydroxylase. Instead, we have found that <I>orf2</I> encodes 3-hydroxybenzoate 6-hydroxylase, the enzyme which catalyzes the NADH-dependent conversion of 3-hydroxybenzoate into gentisate. Accordingly, we have renamed <I>orf2 nagX</I>. After expression in <I>Escherichia coli</I>, the NagX enzyme had an approximate molecular mass of 43 kDa, as estimated by gel filtration, and was probably a monomeric protein. The enzyme was able to convert 3-hydroxybenzoate into gentisate without salicylate 5-hydroxylase activity. Like other 3-hydroxybenzoate 6-hydroxylases, NagX utilized both NADH and NADPH as electron donors and exhibited a yellowish color, indicative of a bound flavin adenine dinucleotide. An engineered mutant of <I>P. naphthalenivorans</I> CJ2 defective in <I>nagX</I> failed to grow on 3-hydroxybenzoate but grew normally on naphthalene. These results indicate that the previously described small catabolic cluster in strain CJ2 may be multifunctional and is essential for the degradation of 3-hydroxybenzoate. Because <I>nagX</I> and an adjacent MarR-type regulatory gene are both closely related to homologues in <I>Azoarcus</I> species, this study raises questions about horizontal gene transfer events that contribute to operon evolution.</P>
An Analysis of Political Appointments of the Recent Governments in South Korea
Minjeong Park,Pan Suk Kim 한국인사행정학회 2016 한국인사행정학회보 Vol.15 No.2
The purpose of this study is to examine what characterizes the political appointments of the recent governments in South Korea from February 2008 to January 2016. In this study, we will assess the political appointment of the latest two regimes’ political executives by analyzing their backgrounds. In particular, we will focus on the ministers and vice-ministers of the Lee Myung-bak and Park Geun-hye governments. We collected data from websites of all ministries and newspapers dealing with the related background information. This data includes information on appointees’ major career, job relevancy, academic background, studies abroad and state examination for career entry. Also, we considered political connections such as membership of the Commission on Presidential Transition and the same political party as the President, and appointees’ affiliated college, birthplace, and gender to appraise the validity, on representation and competence, of the two governments’ political appointments.
Effect of dentin treatment on proliferation and differentiation of human dental pulp stem cells
Park, Minjeong,Pang, Nan-Sim,Jung, Il-Young The Korean Academy of Conservative Dentistry 2015 Restorative Dentistry & Endodontics Vol.40 No.4
Objectives: Sodium hypochlorite (NaOCl) is an excellent bactericidal agent, but it is detrimental to stem cell survival, whereas intracanal medicaments such as calcium hydroxide ($Ca[OH]_2$) promote the survival and proliferation of stem cells. This study evaluated the effect of sequential NaOCl and $Ca(OH)_2$ application on the attachment and differentiation of dental pulp stem cells (DPSCs). Materials and Methods: DPSCs were obtained from human third molars. All dentin specimens were treated with 5.25% NaOCl for 30 min. DPSCs were seeded on the dentin specimens and processed with additional 1 mg/mL $Ca(OH)_2$, 17% ethylenediaminetetraacetic acid (EDTA) treatment, file instrumentation, or a combination of these methods. After 7 day of culture, we examined DPSC morphology using scanning electron microscopy and determined the cell survival rate with 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. We measured cell adhesion gene expression levels after 4 day of culture and odontogenic differentiation gene expression levels after 4 wk using quantitative real-time polymerase chain reaction. Results: DPSCs did not attach to the dentin in the NaOCl-treated group. The gene expression levels of fibronectin-1 and secreted phosphoprotein-1 gene in both the $Ca(OH)_2$- and the EDTA-treated groups were significantly higher than those in the other groups. All $Ca(OH)_2$-treated groups showed higher expression levels of dentin matrix protein-1 than that of the control. The dentin sialophosphoprotein level was significantly higher in the groups treated with both $Ca(OH)_2$ and EDTA. Conclusions: The application of $Ca(OH)_2$ and additional treatment such as EDTA or instrumentation promoted the attachment and differentiation of DPSCs after NaOCl treatment.
MinJeong Kim,SungGon Kim,HyoJeong Kim,HoChan Kim,JiHeh Park,KwangSeok Park,DukKi Lee,WonTan Byun,CheolMin Kim 대한신경정신의학회 2008 PSYCHIATRY INVESTIGATION Vol.5 No.3
Objective-The Penn Alcohol Craving Scale (PACS) is a stronger predictor of subsequent drinking and relapse of alcohol dependence that can be administered more quickly and easily than other craving scales. The goal of this study was to develop the Korean version of the Penn Alcohol Craving Scale (PACS-K). Methods-To examine the psychometric properties of the PACS-K, responses were chosen from 80 patients admitted to a treatment facility for alcohol dependence. Results-The PACS-K possesses good psychometric properties, as assessed by Cronbach’s α estimates (Cronbach’s α=0.91). The test-retest reliability of the PACS-K showed high correlation (p<0.01) when the retest interval was 1 day. When the validity of the PACS-K was investigated using correlation analysis with two other craving scales (the Obsessive Compulsive Drinking Scale (OCDS) and the Visual Analogue Scale (VAS), high correlations were obtained between total PACS scores and total OCDS scores, and between total PACS scores and VAS scores (p<0.01, respectively). Conclusion-The PACS-K is a reliable and valid measure of alcohol cravings, and it could be useful for predicting which individuals are at risk for subsequent relapse.
Minjeong Chae,Hyoung Su Park,Kyong Park 한국영양학회 2021 Nutrition Research and Practice Vol.15 No.2
BACKGROUND/OBJECTIVES: The branched-chain amino acids (BCAA), including isoleucine, leucine, and valine, promote muscle protein synthesis. However, obesity may interfere with protein synthesis by dysregulating mitochondrial function in the muscles. This study aimed to examine the association between dietary intake levels of BCAA and skeletal muscle mass index (SMI) in middle-aged participants, and the effect of obesity/abdominal obesity on this association. SUBJECTS/METHODS: The data of 3,966 men and women aged 50–64 years who participated in the 2008–2011 Korea National Health and Nutrition Examination Survey were analyzed. Intake levels of energy-adjusted dietary amino acids were obtained using a 24-hour dietary recall. SMI was calculated by dividing the appendicular skeletal muscle mass by body weight (kg) and multiplying the result by 100%. Multivariable general linear models were used to analyze the association of dietary BCAA intake levels with SMI. RESULTS: The beneficial effects of energy-adjusted dietary BCAA intakes on SMI were greater in the non-obesity/non-abdominal obesity groups; however, no significant associations were observed in the obesity/abdominal obesity groups (P > 0.05). CONCLUSIONS: Healthy weight and sufficient intake of dietary BCAA are recommended to maintain muscle mass.
Park Minjeong,Shin Eunhye,Hong Jongin,Paik Hanjong 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.12
β-Ni(OH)2 and NiO nanostructured films were prepared on fluorine-doped tin oxide (FTO) glass substrates by using chemical bath deposition (CBD) at different concentrations of a complexing agent (i.e., NH3). The as-deposited β-Ni(OH)2 films exhibited various porous structures, such as nanoislands, nanoflakes, nanosheets and nanoplatelets, depending on the concentration of the complexing agent, and they could be converted to NiO films by using calcination. The β-Ni(OH)2 and the NiO films were characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). Importantly, the electrochemical activity of NiO nanoplatelet-films for the oxygen evolution reaction (OER) was also investigated as a function of the annealing temperature.