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Kim Jieun,Myung Rangmi,Kim Bongyoung,Kim Jinyeong,Kim Tark,Lee Mi Suk,Kim Uh Jin,Park Dae Won,Kim Yeon-Sook,Lee Chang-Seop,Kim Eu Suk,Lee Sun Hee,Chang Hyun-Ha,Lee Seung Soon,Park Se Yoon,Choi Hee Jun 대한의학회 2024 Journal of Korean medical science Vol.39 No.12
Background: Since the emergence of hypervirulent strains of Clostridioides difficile, the incidence of C. difficile infections (CDI) has increased significantly. Methods: To assess the incidence of CDI in Korea, we conducted a prospective multicentre observational study from October 2020 to October 2021. Additionally, we calculated the incidence of CDI from mass data obtained from the Health Insurance Review and Assessment Service (HIRA) from 2008 to 2020. Results: In the prospective study with active surveillance, 30,212 patients had diarrhoea and 907 patients were diagnosed with CDI over 1,288,571 patient-days and 193,264 admissions in 18 participating hospitals during 3 months of study period; the CDI per 10,000 patientdays was 7.04 and the CDI per 1,000 admission was 4.69. The incidence of CDI was higher in general hospitals than in tertiary hospitals: 6.38 per 10,000 patient-days (range: 3.25–12.05) and 4.18 per 1,000 admissions (range: 1.92–8.59) in 11 tertiary hospitals, vs. 9.45 per 10,000 patient-days (range: 5.68–13.90) and 6.73 per 1,000 admissions (range: 3.18–15.85) in seven general hospitals. With regard to HIRA data, the incidence of CDI in all hospitals has been increasing over the 13-year-period: from 0.3 to 1.8 per 10,000 patient-days, 0.3 to 1.6 per 1,000 admissions, and 6.9 to 56.9 per 100,000 population, respectively. Conclusion: The incidence of CDI in Korea has been gradually increasing, and its recent value is as high as that in the United State and Europe. CDI is underestimated, particularly in general hospitals in Korea.
Surface-modified polymer nanofiber membrane for high-efficiency microdust capturing
Kim, Han-Jung,Park, Seon Joo,Park, Chul Soon,Le, Thanh-Hai,Hun Lee, Sang,Ha, Tai Hwan,Kim, Hyoung-il,Kim, Jinyeong,Lee, Chang-Soo,Yoon, Hyeonseok,Kwon, Oh Seok Elsevier 2018 Chemical Engineering Journal Vol.339 No.-
<P><B>Abstract</B></P> <P>Particulate matter (PM) pollution is serious human health issue. Various filter technologies have been developed to improve the air filtration efficiency. Recently, nanofibrous membrane filters have received much attention due to its outstanding transparency and high efficiency for PM ≤ 2.5 μm (PM<SUB>2.5</SUB>) capture/removal compared to conventional micro-structured filters. Although these filters provide high-efficiency PM<SUB>2.5</SUB> capture, obtaining strong PM adhesion via surface engineering remains a challenge. In this study, we demonstrate a high efficiency PM<SUB>2.5</SUB> capture air-filter by electrospun polyacrylonitrile nanofibers (EPNFs). The surface of the EPNFs was modified by oxygen plasma treatment for generating functional groups such as CONH<SUB>2</SUB>, COOH and COOR. The EPNFs were utilized as air filter in hand-made PM removal system which is consisted of DC power supply, PM source, PM sensor and PM removal test chamber. The test result showed high air flow and effective air filtration (PM<SUB>2.5</SUB> removal efficiency: 94.02%, pressure drop: 18 Pa, Time to reach the PM level recommended by the World Health Organization (T<SUB>WHO PM2.5</SUB>): 15 min, quality factor: 0.1564 Pa<SUP>−1</SUP>) compared to commercial filters. The intermolecular interaction between the plasma-treated EPNFs (PEPNFs) and PMs was investigated by density functional theory (DFT) calculations. The PEPNF filter showed high long-term reproducibility in a cycle test with a high PM concentration (over 2,000 μg m<SUP>−3</SUP>). The filter was applied as a car interior air purifier using a cigar jack as a power supply, <I>ca.</I> 16 min was required to reach the PM level recommended by the World Health Organization (<25 μg m<SUP>−3</SUP>).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Surface-modified nanofibers were effective for particulate matter (PM) filtration. </LI> <LI> Intermolecular interaction was studied using density functional theory calculation. </LI> <LI> A car interior air purifier was demonstrated using the nanofiber membrane. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jinyeong Choi,Deokjae Cha,Dong-Soo Kim,Jinwhoa Yum,Taewoo Kim,Seunghwan Lee 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
The Japanese pine bast scale, Matsucoccus matsumurae (Kuwana, 1905), is a destructive pest of pine trees in America, East Asia and Northern Europe. The spread of damage to black pine trees, Pinus thunbergii, of M. matsumurae was reported from all southern, and some eastern and west costal regions in Korea, under the name of M. thunbergianae which was newly described by Miller & Park (1987) as a new species. Historically, M. thunbergianae was synonymized with M. matsumurae by Booth & Gullan (2006), on the basis of molecular sequence data. However, the supporting data for the synonym is unavailable in any DNA database, such as GenBank and BOLD. Moreover, M. thunbergianae have been still used to the resent scientific studies in Korea. Here, we performed morphological and molecular comparison to review the result of Booth & Gullan (2006), using M. matsumurae from Fukuoka, Japan and topotype materials of M. thunbergianae from Goheung, Korea. Our data supported the opinion of Booth & Gullan (2006) following results: The morphological features of adult female and male of M. thunbergianae are identical to those of M. matsumurae. Also, DNA sequences (COI, 18S rDNA and 28S rDNA) of M. thunbergianae showed identical or very low genetic distances with those of M. matsumurae. From the regional sampling in Korea, M. matsumurae was newly found in Jeju and Seoul.
Kim, Jinyeong,Kim, Seungbum,Yoon, Sangyoung,Hong, Eunsoo,Ryu, Yeonwoo Springer International 2015 Applied microbiology and biotechnology Vol.99 No.15
<P>Thermostable esterases have potential applications in various biotechnology industries because of their resistance to high temperature and organic solvents. In a previous study, we isolated an esterase from Archaeoglobus fulgidus DSM 4304 (Est-AF), which showed high thermostability but low enantioselectivity toward (S)-ketoprofen ethyl ester. (R)-ketoprofenor (S)-ketoprofenis produced by esterase hydrolysis of the ester bond of (R,S)-ketoprofen ethyl ester and (S)-ketoprofen has better pharmaceutical activity and lower side effects than (R)-ketoprofen. Therefore, we have generated mutants of Est-AF that retained high thermostability whilst improving enantioselectivity. A library of Est-AF mutants was created by error-prone polymerase chain reaction, and mutants with improved enantioselectivity were isolated by site-saturation mutagenesis. The regions of Est-AF containing amino acid mutations were analyzed by homology modeling of its three-dimensional structure, and structure-based explanations for the changes in enantioselectivity are proposed. Finally, we isolated two mutants showing improved enantioselectivity over Est-AF (ee%?=?-16.2??0.2 and E?=?0.7??0.0): V138G (ee%?=?35.9??1.0 and E?=?3.0??0.1) and V138G/L200R (ee%?=?89.2??0.2 and E?=?19.5??0.5). We also investigated various characteristics of these mutants and found that the mutants showed similar thermostability and resistance to additives or organic solvents to Est-AF, without a significant trade-off between activity and stability.</P>