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Quyen Van Nguyen,Hang Thi Khuat,Yen‑Ngoc Thi Nguyen,Dung Thi Vu,Thu‑Ha Bui,부경환 한국식물생명공학회 2020 Plant biotechnology reports Vol.14 No.5
Drynaria bonii H. Christ is a medicinal plant that has traditionally been used for the treatment of chronic diseases and tuberculosis. However, D. bonii has not yet been cultivated or propagated. In this study, we optimized the conditions for the spore culture of D. bonii to produce sporophytes. First, we evaluated the efects of various factors, such as temperature, light intensity, potting material, and pH, on spore germination and early gametophyte development. Under optimal culture conditions, 95–99% of the spores germinated within 2 weeks of culture. Next, based on these results, we established a culture system for gametophyte development and sporophyte production. Mature gametophytes frst appeared 5 months post-germination (mpg), and at 12 mpg, the rate of production of heart-shaped gametophytes reached 56.6%. Sporophytes at the early frst-leaf stage frst appeared at 6 mpg, and at 12 mpg, the rate of formation of sporophytes reached 15.4%. Interestingly, 6.3% of all gametophytes produced multiple sporophytes. Additionally, 42–62% of the gametophytes also produced multiple secondary gametophytes, indicating a high potential of D. bonii gametophytes to generate new gametophytes and, subsequently, sporophytes. When transferred to new trays or pots, sporophytes grew well and showed 100% survival. Overall, we conclude that this spore culture system can be successfully used for the propagation of D. bonii sporophytes.
Viscous heating and temperature profiles of liquid water flows in copper nanochannel
Quyen Van Dinh,Truong Quoc Vo,김보흥 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7
Understanding nanoscale fluidic transport becomes increasingly important due to the rapid development of nanotechnology and nanofabrication. By using molecular dynamics (MD) simulations, we investigated the viscous heating of water flows in copper nanochannels. The two scenarios that were studied are Couette flows and Poiseuille flows. We observed the scale effects on the distribution of fluid density, streaming velocity, fluid viscosity, and temperature across the channel. The results revealed the significant effects of surface forces on causing a large deviation between simulation results and classical hypothesis. We found that the energy equation coupled with the thermal-slip boundary conditions still fails to predict the temperature distributions. Hereby, further scale effects are taken into account, which leads to better predictions. The model that we developed in this study shows the relative deviation to the simulation data within 5 %, which is small compared to the conventional continuum approach (i.e., up to 51 %).
Quyen Van Nguyen,선현진,부경환,이도성,이지현,임평옥,이효연,Key Zung Riu,이동선 한국식물생명공학회 2013 Plant biotechnology reports Vol.7 No.1
The objective of this study was to develop an efficient system for the regeneration of spinach plants (Spinacia oleracea L.) by investigating the factors influencing callus and shoot induction. All plant growth regulator (PGR) combinations tested induced callus with high frequency (73–100 %), and the combination of 5 lM a-naphthaleneacetic acid (NAA), 10 lM 6-benzyladenine (BA) and 0.1 lM gibberellic acid (GA3) had the most significant effect on callus growth in term of weight (120.98 ± 22.56 mg). A high auxin-containing medium induced competent callus for shoot formation, while high cytokinin-containing media enhanced callus growth and made callus incompetent for shoot regeneration. Longer periods of callus induction in a high auxin-containing medium were required to form competent callus and led to a high regeneration capacity. The PGR combination shift from a high auxin to cytokinin ratio (ACR) to a low ACR resulted in highly efficient regeneration. Among the regeneration systems tested, the combination of 10 lM NAA and 0.3 lM GA3 for callus induction for 6 weeks followed by 2 lM NAA and 5 lM BA resulted in the highest plant regeneration frequency (83.33 ± 6.43 %) andthe highest number of plantlets per explant (7.93 ± 1.24). Somatic embryos at cotyledonary stage and plantlets were transferred to PGR-free medium to establish whole plants. Regenerated female plants grew well to maturity in the greenhouse (77.17 ± 9.80 %) and produced seeds (175.21 ± 28.01 firm seeds per plant).
Van Hoa, Nguyen,Quyen, Tran Thi Hoang,Nghia, Nguyen Huu,Van Hieu, Nguyen,Shim, Jae-Jin Elsevier 2017 Journal of alloys and compounds Vol.702 No.-
<P><B>Abstract</B></P> <P>Hierarchical flower-like V<SUB>2</SUB>O<SUB>5</SUB> growth on graphene and nickel foam electrodes was fabricated by using chemical vapor deposition and hydrothermal methods for electrochemical capacitors. Taking advantages of the high conductivity of graphene, high capacitance of well-defined V<SUB>2</SUB>O<SUB>5</SUB> flower-like structure and open framework of three-dimensional nickel foam, the resulting electrodes exhibited rapid electron and ion transport, large electroactive surface area, and excellent structural stability. The specific capacitance was as high as 1235 F g<SUP>−1</SUP> at a current density of 2 A g<SUP>-1</SUP>, suggesting its potential as a high performance electrode for supercapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hierarchical flower-like V2O5/graphene/nickel foam electrodes was fabricated. </LI> <LI> The electrodes exhibited rapid electron and ion transport, large electroactive surface area. </LI> <LI> The specific capacitance was as high as 1235 A g−1 at a current density of 2 A g−1. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Quyen Le Hoang Thuy To NGUYEN,Du Van NGUYEN,Ngoc Nguyen Mong CHU,Van Hong TRAN 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11
The shift from elite education to mass education in Vietnam has met the demand for education for everybody as well as for quality human resource talent for an emerging nation. Under the resource constraint, understanding the quality dimensions of education and its priority level is important for effective and efficient policies. This study was carried out using both qualitative and quantitative methodologies to develop quality criteria and a ranking model. Two rounds of in-depth interviews were conducted with fifteen experts in the field, who were rectors, employers, and recruitment specialists to develop the quality framework applied in Vietnamese universities under total quality management (TQM), starting from the input of the senior secondary school leavers, through a teaching process to the output. The first round of interviews were unstructured questionnaires designed to explore the main factors in quality assessment model. The second round affirmed the experts’ agreement on the assessment model. Then, fuzzy logic was applied to rank eight criteria in the quality assessment model into priority order: cost, teaching and administrative staff, leadership, curriculum, student-related factors, internationalization, admissions, and campus. The results are critical for identifying the necessary actions to enhance the education quality and to further research on the optimal quality model.
A novel strain of porcine deltacoronavirus in Vietnam
Le, Van Phan,Song, Sok,An, Byung-Hyun,Park, Gyu-Nam,Pham, Ngoc Thach,Le, Dinh Quyen,Nguyen, Van Tam,Vu, Thi Thu Hang,Kim, Ki-Sun,Choe, SeEun,An, Dong-Jun Springer-Verlag 2018 Archives of virology Vol.163 No.1
<P>Two porcine deltacoronavirus (PDCoV) strains (Binh21 and HaNoi6) were isolated from two pig farms in North Vietnam. Phylogenetic analysis of the complete genomes and the Spike and Membrane genes revealed that the two Vietnam PDCoVs belong to the same lineage as PDCoVs from Thailand and Laos; however, the N genes belonged to the same lineage as PDCoVs from the USA, Korea, China, and Hong Kong. The recombination detection program subsequently identified the major parent (S5011 strain) and minor parent (HKU15-44 strain) of the two Vietnam PDCoV strains (p < 0.01).</P>