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Preparation and characterization of silicone resin nanocomposite containing CdSe/ZnS quantum dots
Trung, Nguyen Ngoc,Luu, Quynh‐,Phuong,Son, Bui Thanh,Sinh, Le Hoang,Bae, Jin‐,Young Wiley Subscription Services, Inc., A Wiley Company 2012 Polymer composites Vol.33 No.10
<P><B>Abstract</B></P><P>We report the preparation of the core/shell cadmium selenide/Zinc sulfide quantum dots (CdSe/ZnS QDs)‐silicone resin nanocomposite through the solution‐mixing method, followed by thermal hydrosilylation. After dispersing QDs into Dow Corning two‐component silicone resins (OE6630A and OE6630B at 1:4 mixing ratio by weight), the resins were cured at 150°C for 1.5 h to produce QD‐silicone resin nanocomposites. The curing behavior of the silicone resins resulting from the thermal hydrosilylation was studied using differential scanning calorimetry (DSC). The properties of the QD‐silicone resin nanocomposites were investigated by ultraviolet–visible (UV–vis), fluorescence, confocal laser scanning microscopy (CLSM), atomic force microscopy (AFM), and thermogravimetric analysis (TGA) measurements. The QDs that contain trioctylamine (TOA) as the original ligand can poison the Pt catalyst in the resins and inhibit the curing process by increasing the exothermic peak temperature, at which a lower heat of hydrosilylation is observed. Incorporating a small amount of CdSe/ZnS QDs (0.1 wt%) can greatly improve the thermal stability of the silicone resins. Moreover, CdSe/ZnS QDs tend to form clusters that are relatively homogeneously distributed in a cured silicone resin, offering good optical properties of 11.2 lm W<SUP>−1</SUP> luminous efficiency and 14.6% photoluminescence conversion efficiency (PCE) in light emitting device (LED) test. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers</P>
Hoang Thi Lan Anh,Le Thi Thanh Hue,Bui Nguyen Hai Linh,Trinh Thanh Trung 한국미생물학회 2023 미생물학회지 Vol.59 No.2
Consumer demand for high-quality and safe fermented meat products is increasing recently, with great attention on functional starter cultures using lactic acid bacteria (LAB). This study aimed to select autochthonous LAB strains that have beneficial effects for human health and technological properties for the production of lap xuong, a traditional fermented sausage of ethnic minorities in northwestern Vietnam. From nine lap xuong samples, 63 LAB strains were isolated and identified into 14 species belonging to 8 genera. Latilactobacillus sakei was the most common species, followed by Lactiplantibacillus plantarum, Lactococcus lactis, and Pediococcus pentosaceus. Five strains of Enterococcus faecium LM0204, Lactococcus lactis LM0302, Latilactobacillus sakei LM0405, Lactiplantibacillus plantarum LM0705, and Lactiplantibacillus plantarum LM0901 exhibited probiotic properties, including tolerance to gastrointestinal tract conditions, adhesion ability to HT-29 cell line, antagonistic activity against harmful bacteria, and antioxidant activities. The strains were further evaluated for technological and safe properties, such as gas production, growth at different temperatures and simulated fermentation and ripening stages, lactic acid production, biogenic amine production, and antibiotic susceptibility. Enterococcus faecium LM0204 and Lactococcus lactis LM0302 were excluded because of tyramine production or unable growth in simulated fermentation conditions. All together probiotic properties and better technical functionality, Latilactobacillus sakei LM0405 and Lactiplantibacillus plantarum LM0705 were proposed as starter cultures for sausage production in northwestern Vietnam. Further studies are needed to standardize the sensory quality and safety aspects of lap xuong in this area using the proposed starter cultures strains for making fermented sausage.
Thanh Bui Trung,Van Pham Hung,Hai Tran Hoang,Le Minh Tung,이재령 한국자원공학회 2015 Geosystem engineering Vol.18 No.4
A method for detecting glypican 3 (GPC3) liver cancer cells by coupling of anti-glypican 3 antibody (anti-GPC3) and magnetite nanoparticles (NPs) was investigated to detect GPC3 by enzyme-linked immunosorbent assay (ELISA) in this study. Magnetite NPs with the average size of 11 nm were synthesized by using co-precipitation method of Fe2+ and Fe3+ in NH3·H2O solution. First, silica was coated on the magnetite NPs using Stöber method to obtain Fe3O4/SiO2 core-shell structures and then 3-aminopropyltriethoxysilane (APTES) was treated on the Fe3O4/SiO2 by silanization reaction to achieve Fe3O4/SiO2/APTES nanostructures. After modified by APTES, the nanostructures were activated by glutaraldehyde (GA) to obtain functional groups on the nanostructures surface to bind with anti-GPC3 by covalent immobilization. The UV–vis spectroscopy was carried out to investigate the binding of anti-GPC3 to the NPs and binding efficiency (88.35%) was estimated by the Bradford method. The NPs bound anti-GPC3 (NPs/anti-GPC3) can detect GPC3 by using ELISA at low concentration (0.16 ng/ml).
A Phosphate Starvation-Inducible Ribonuclease of Bacillus licheniformis
( Thanh Trung Nguyen ),( Minh Hung Nguyen ),( Huy Thuan Nguyen ),( Hoang Anh Nguyen ),( Thi Hoi Le ),( Thomas Schweder ),( Britta Jurgen ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.8
The BLi03719 protein of Bacillus licheniformis DSM13 belongs to the most abundant extracellular proteins under phosphate starvation conditions. In this study, the function of this phosphate starvation inducible protein was determined. An amino-acid sequence analysis of the BLi03719-encoding gene showed a high similarity with genes encoding the barnase of Bacillus amyloliquefaciens FZB42 and binase-like RNase of Bacillus pumilus SARF-032. The comparison of the control strain and a BLi03719-deficient strain revealed a strongly reduced extracellular ribonuclease activity of the mutant. Furthermore, this knockout mutant exhibited delayed growth with yeast RNA as an alternative phosphate and carbon source. These results suggest that BLi03719 is an extracellular ribonuclease expressed in B. licheniformis under phosphate starvation conditions. Finally, a BLi03719 mutant showed an advantageous effect on the overexpression of the heterologous amyE gene under phosphate-limited growth conditions.
Micropropagation from root segments to improve seedling quality in Chinese foxglove crops
Thanh Loan Pham,Van Huy Nguyen,Thi Le Thu Hoang,Thi Tam Tien Ha,Trung Kien Tran,Xuan Duong Vu,Phi Bang Cao,Quang Trung Nguyen 한국식물생명공학회 2020 JOURNAL OF PLANT BIOTECHNOLOGY Vol.47 No.3
This is the first study to establish a complete protocol for micropropagation of Rehmannia glutinosa from root segments. The study involved investigating the effect of plant growth regulators on in vitro shoot regeneration and rooting and identifying substrates supporting survival and growth performance of ex vitro seedlings. A Murashige and Skoog (MS) medium containing 30 g/L sucrose for shoot induction and 0.2 mg/L indole-3-acetic acid (IAA), 1 mg/L 6-benzylaminopurine (BAP), and 1 g/L polyvinylpyrrolidone (PVP) for shoot multiplication resulted in the highest number of shoots per explant and shoot height. Applying a medium containing 0.5 mg/L IAA and 1 g/L PVP yielded optimal rooting of the shoots grown in vitro. Compost enriched with microbial inoculants and perlite enhanced seedling growth better than that with organic biofertilizer-free substrates (soil and sand). We recommend the continuous production of micropropagated R. glutinosa seedlings from root segments under the aforementioned conditions as a possible propagation technique for crops of this species.
Le Hoang Sinh,신승한,임동국,Nguyen Ngoc Trung,Bui Thanh Son,배진영 한국고분자학회 2013 Macromolecular Research Vol.21 No.10
A novel all aromatic 2,7-naphthalene-based liquid crystalline epoxy (LCE) was synthesized successfully in this study. The thermal transition of the synthesized LCE was characterized by wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and polarized optical microscopy (POM). The characterization showed that the LCE had a low melting temperature of 65 oC and was in a nematic state in temperature range of 65-75 oC. The curing reaction between LCE and 4,4'-diaminodiphenylsulfone (DDS) was investigated, using 2-methylimidazole (2MI) as the reaction catalyst. Upon the addition of 1 phr of 2MI, the curing temperature was dramatically decreased from 227 to 128 oC, which is 99 oC lower than that of a reaction without the use of a catalyst system.
Nguyen, Thanh Huong,Nguyen, Trung Kien,Kim, Bao Giang,Hoang, Van Minh,Phan, Thi Hai,Doan, Thu Huyen,Luong, Ngoc Khue,Nguyen, Thuy Linh,Nguyen, Tuan Lam,Pham, Thi Quynh Nga Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup1
Studies have shown that smoking is a learnt behavior, often initiated during adolescence. This paper aims to describe tobacco-related knowledge, attitude and associations among school adolescents aged 13-15 with exposure to anti-smoking information. Using data from the Global Youth Tobacco Survey (GYTS) in Viet Nam, 2014, knowledge was measured through 4 questions about tobacco use, and attitude was assessed through 3 questions on personal, social and environmental aspects. Students giving most anti-tobacco responses to all questions were considered as having correct knowledge or appropriate attitude or both. Access to anti-smoking information was determined by exposure to any media messages on tobacco control during the past 30 days and teaching in school about the danger of tobacco use during the past 12 months. A substantial percentage of students thought that being near others who smoke might be harmful to them and smoking is harmful to health (89.4% and 89.6% respectively). However, only 46.4% reported that it is definitely difficult to quit smoking and 66.9% thought that smoking for only 1 or 2 years, once stopped, is harmful to health. Slightly more than half of the respondents reported appropriate attitude that young smokers have fewer friends than others and smoking makes them less attractive and less comfortable at social events. Noticing anti-smoking messages in the media together with having lessons in school about the dangers of tobacco substantially increased the likelihood of having correct knowledge, appropriate attitude and both. Despite relatively high awareness about smoking harms, effective educational communication is still highly needed to improve the level of comprehensive knowledge and an appropriate attitude regarding tobacco use.
Revisiting Customer Complaint Intention: A Case Study of Mobile Service Users in Vietnam
Liem Thanh NGUYEN,Minh Hoang DANG,Thu Duyen TAT,Dinh Gia Trung TRAN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.9
In the mobile industry, customer complaints play a significant role in retaining customer loyalty to the services provided. Thanks to user complaints, mobile service providers can effectively identify problems and then propose solutions to adapt or improve their services. Hence, it’s critical to understand the relationship between consumer complaints and satisfaction with mobile services. While several studies have shown that customer satisfaction is an intermediary variable that explains customer complaint intention, there have been few studies on the relationship between pre-determinants of their satisfaction, leaving a gap in our understanding of customer complaint intention. To demonstrate an in-depth approach to this matter, authors revisit justice theory and suggest trust and perceived responsibility variables be combined into a research model. A cross-section survey was conducted to collect data from 265 mobile services users of the three biggest mobile service providers in Kien Giang Province, Vietnam. This study employed Structural Equation Modeling (SEM) method to analyze the samples collected. The result showed that customer complaint intention is affected by distributive justice, interactional justice, trust but not procedural justice. Additionally, the moderating role of the perceived responsibility variable to the relationship between customer satisfaction and complaint intention is also proved.
Bui Trung Thanh,Tran Hoang Hai,Pham Hung Van,Le Minh Tung,이재령 한국자원공학회 2019 Geosystem engineering Vol.22 No.4
The detection of hepatitis B surface antigen (HBsAg) with an immunoassay using magnetite nanoparticles (NPs) that bind hepatitis B surface antibody (anti-HBs) was investigated. Magnetite NPs with an average size of 32 nm were synthesized and functionalized using tetraethyl orthosilicate, 3-aminopropyltriethoxysilane, glutaraldehyde, and streptavidin. The functionalized NPs were conjugated with biotinylated anti-HBs to capture HBsAg. HBsAgs were detected with a sensitivity, specificity and agreement of 98%, 97%, and 97.5%, respectively, when compared to the rapid test. In addition, the novel method could also enrich HBsAgs, using different tube sizes and can facilitate amplification for the detection of microorganisms.