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( Nguyen Thai Son ),( Vu Thi Thu Huong ),( Vu Thi Kim Lien ),( Do Thi Quynh Nga ),( Tran Thi Hai Au ),( Tang Thi Nga ),( Le Nguyen Minh Hoa ),( Tran Quang Binh ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.9
The extensive distribution of multidrug-resistant (MDR) methicillin-resistant Staphylococcus aureus (MRSA) poses a threat to healthcare worldwide. This study aimed to investigate the MDR and molecular patterns of MRSA isolates in children admitted to the two biggest tertiary care pediatric hospitals in northern and southern Vietnam. A total of 168 MRSA strains were collected to determine antibiotic susceptibility by minimum inhibitory concentration tests. Antibiotic-resistant genes, pulsed-field gel electrophoresis, staphylococcal cassette chromosome mec (SCCmec) typing, and multilocus sequence typing were used for the molecular characterization of MRSA. Among the total strains, the MDR rate (51.8%) was significantly higher in the northern hospital than in the southern hospital (73% vs. 39%, p < 0.0001). The MDR-MRSA with the highest rates were “ciprofloxacin-erythromycin-gentamicin-tetracyclines” (35.6%), followed by “erythromycin-tetracycline-chloramphenicol” (24.1%), and “ciprofloxacin-erythromycin-gentamicin” (19.5%), showing an accumulative total of 79.3%. The most susceptible antibiotics were rifampicin (100%) and vancomycin (100%), followed by doxycycline (94.0%), meropenem (78.0%), and cefotaxime (75.0%). The SCCmecII strains showed greater resistance to gentamicin, ciprofloxacin, tetracycline, meropenem and cephalosporins compared with the other strains. The SCCmecII strains exhibited the highest rate in the tested genes (aacA/aphD: 55.2%, ermA/B/C: 89.7%, and tetK/M: 82.8%). ST5-SCCmecII was the predominant clone in the northern hospital, whereas SCCmecIVa was more pronounced in the southern hospital. In conclusion, our results raised concerns about the predominant MDR-MRSA strains in the pediatric hospitals in Vietnam. The north-south difference in the antibiotic resistance patterns and genetic structure of MRSA suggests different MRSA origins and various uses of antimicrobial agents between the two regions.
( Tran Thi Thuy Nga ),권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
In this study, we synthesize GAP-base particles as an adsorbent containing azide groups which are known as one of highly reactive groups and its ability to remove metal ions due to a strong coordination with these metal ions. The spherical particles containing azide groups are prepared by suspension method via a reaction of glycidyl azide polymer (GAP) and bis-propargyl succinate (BPS) and an aid of polyvinyl alcohol (PVA). Cu-free Click reaction occurs via azide groups of GAP and alkyne groups of BPS. The changing of agitation speed, concentration of PVA and content of organic phase affects to particle size and particle size distribution. The spherical shape and mechanical properties of particles are obtained by SEM and TGA, DMA, DSC measurements. The efficiency of removing metal ions is obtained by adsorption Hg2+ and Pb2+. Freundlich isotherm model is used to describe the adsorption process. GAP-base particle is the promising adsorbent for wastewater treatment containing metal ions.
Tran, Khanh Long,Phung, Xuan Son,Kim, Bao Giang,Phan, Thi Hai,Doan, Thi Thu Huyen,Luong, Ngoc Khue,Pham, Thi Quynh Nga,Nguyen, Tuan Lam,Hoang, Van Minh,Le, Thi Thanh Huong Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup1
Evidence shows that tobacco advertising and promotion activities may increase tobacco consumption and usage, especially in youth. Despite the regulation on prohibiting advertisement of any tobacco product, tobacco advertisement and promotion activities are still common in Vietnam. This article presents current exposure to tobacco advertising and promotion (TAP) among school children aged 13 to 15 years in Vietnam in 2014 and potential influencing factors. Data from the Global Youth Tobacco Survey 2014 in Vietnam covering 3,430 school aged children were used. Both descriptive and analytical statistics were carried out with Stata 13 statistical software. Binary logistic regression was applied to explain the exposure to TAP among youth and examine relationships with individual factors. A significance level of p<0.05 and sampling weights were used in all of the computations. In the past 30 days, 48.6% of the students experienced exposure to at least 1 type of tobacco advertising or promotion. Wearing or otherwise using products related to tobacco was the most exposure TAP type reported by students (22.3%). The internet (22.1), points of sales (19.2) and social events (11.5) were three places that students aged 13-15 frequently were exposed to TAP. Binary logistic results showed that gender (female vs male) (OR = 0.61, 95%CI: 0.52 - 0.71), susceptibility to smoking (OR = 2.12, 95%CI: 1.53 - 2.92), closest friends' smoked (OR = 1.43, 95%CI: 1.2 - 1.7) and parents smoking status (OR = 2.83, 95%CI: 1.6 - 5.01) were significantly associated with TAP exposure among school-aged children. The research findings should contribute to effective implementation of measures for preventing and controlling tobacco use among students aged 13-15 in Viet Nam.
Fabrication and Properties of Azide-containing Nanofibers Electrospun using PVAc/GAP mixtures
( Tran Thi Thuy Nga ),권영환 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Electrospinning technology is a simple and direct method for the fabrication of polymer nanofibers which are continuous polymer fibers ranging from several micrometers to several hundred nanometers. There are many types of nanofibers whose applications are in various fields, such as composites, protective clothing, biomedicines and drug delivery, filtration, and agriculture. In this study, the azide-containing nanofibers were fabricated using co-electrospinning PVAc/GAP/BPS solution, followed by Click reaction between GAP and BPS. The parameters of electrospinning process were controlled and then, click reaction was occurred at 50 °C. The morphology of nanofibers before and after click reaction were revealed by SEM result. In the future, we would like to point out the application of nanofiber in wastewater treatment by assembling nanofibers into membrane filtration, wherein PVAc nanofiber with azide functional groups as an adsorbent can remove heavy metal ions from contaminated water.
( Tran Thi Thuy Nga ),서민영,권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In this study, we synthesized GAP-based particles contain functional azide groups on the surface as a polymeric adsorbent applied to remove metal ions. The stable particles were prepared by suspension method. Glycidyl azide polymer was crosslinked by bis-propargyl succinate via Cu-free Click reaction. Effect of suspension parameters were studied on particle size and partilce size distribution to provide control size of particles. The presence of azide groups on particles was showed at 2097 cm-1 through FTIR result and its spherical morphology was observed by microscope measurement with different sizes from 0.25-1.4mm. TGA results showed high thermal stability of particles through high decomposition temperature at 240°C. Adsorption experiment was studied on Hg(II), Pb(II) metal ions. Freundlich isotherm model was used to describe the heterogeneous adsorption between particles and Pb(II) while Linear isotherm model predicted the adsorption process for Hg(II).
Tran, Thi Nga,Mai, Thanh Binh,Bach, Long Giang,Islam, Md Rafiqul,Gal, Yeong Soon,Lim, Kwon Taek American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.1
<P>A new strategy has been developed for covalent incorporation of SiO2 nanoparticles (N-'s) in the CO2-based copolymer, poly(propylene carbonate-co-propylene oxide) (poly(PC-co-PO)). The poly(PC-co-PO)-g-SiO2 nanocomposites was prepared by the combination of epoxy-CO2 ring-opening polymerization and the condensation reaction of chloride and hydroxyl groups of the polymer and the SiO2 surface. FT-IR and NMR were employed for the characterization of the copolymers as well as nanocomposites. A uniform and spherical core-shell structure of poly(PC-co-PO)-g-SiO2 nanocomposites was demonstrated from TEM and SEM images. An improved thermal property of the polymer matrix with incorporating SiO2 nanoparticles was revealed by TGA study. The grafting of poly(PC-co-PO) considerably prevented the aggregation and improved the dispersibility of SiO2 nanoparticles in toluene.</P>
The Impact of Foreign Ownership and Management on Firm Performance in Vietnam
NGUYEN, Thi Xuan Hong,PHAM, Thu Huyen,DAO, Thi Nhung,NGUYEN, Thi Nga,TRAN, Thi Kim Ngoc Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.9
The human and capital resources from foreign investors are important sources of finance for developing countries. Foreign ownership can help the firm to raise funds for operations and the foreign management can help the firm expand the market and improve management. However, does this really happen to Vietnamese firm? To find the answer to that question, this paper examines the impact of foreign ownership and management on the financial performance of listed firms on Vietnam's stock market. The data collected include 427 listed firms in all fields over five years, from 2014 to 2018. The financial performance is measured by Tobin's Q, ROA and ROE. The study carried out testing of each model by the least squares method of Pool OLS, assessing random effects (REM) and evaluating fixed effects (FEM). The most effective model is the FEM model. The results show that the foreign ownership ratio and the size of the firm have a positive impact on the financial performance. The foreign management, the age of the firms, the liquidity and financial leverage have a negative impact on the financial performance. Based on the research results, the study proposes some recommendations to improve the financial performance of listed firms in Vietnam.