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Nam Tuan Vu,Juan Manuel Pardo,Elizabeth Alvarez,Ham Huy Le,Kris Wyckhuys,Kim-Lien Nguyen,Dung Tien Le 한국응용생명화학회 2016 Applied Biological Chemistry (Appl Biol Chem) Vol.59 No.2
Cassava (Manihot esculenta Crantz) is one of the most important food crops in the tropics; however, bacterial phytopathogens pose a serious threat to its farming. Cassava Witches’ Broom Disease (CWB) is caused by the infection of phytoplasma and is manifested as reduction in tuber yield and starch content at harvest of 10 and 30 %, respectively. Although polymerase-chain reaction provides the gold standard in diagnostics, this method requires significant investments in infrastructure and training. Here, we developed a loop-mediated isothermal amplification (LAMP) assay that allows specific detection of phytoplasma from field-collected samples. Three primer sets were designed, of which two detected phytoplasma DNA sequence encoding 16S rRNA (16S rDNA), the other detected cassava actin. Following a 1 h LAMP reaction at 63 °C, a positive reaction can be visualized by agarose gel electrophoresis, hydroxynaphthol blue color change, or the presence of a precipitate. In a pilot field study, the assay was able to rapidly distinguish between healthy and CWB-infected cassava. With further development, a LAMP for routine on-site screening of cassava crops can be envisioned.
Le Vu Nam,Changwook Seol(설창욱),Tuyet Anh Pham,Segeun Jang(장세근),Sang Moon Kim(김상문) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Elevated temperature operating polymer electrolyte membrane fuel cells have gained considerable interest owing to good electrode kinetics, high CO tolerance, and improved heat management. It was supposed that inserting inorganic fillers (SiO<SUB>2</SUB>, TiO<SUB>2</SUB>, etc.,) in the Nafion® membrane can retain water under higher temperature, low humidity operating condition. This incorporation would increase the electrochemical performance of the membrane. Conventionally, many researches inserted the inorganic fillers utilizing casting and evaporation approach. However, this method decreases proton pathways and induces agglomeration, thus would not significantly increase the efficiency of the membrane. Here in, homogeneous patterned TiO<SUB>2</SUB> have been added onto the anode side of the electrolyte membrane. The addition of patterned TiO<SUB>2</SUB> not only manages the agglomeration of inorganic filler but also maintains the ionic conductivity of the membrane. This resulted in enhanced the maximum power output of the membrane electrode assembly by more than 35% compare to the to the conventional Nafion® MEA under intermediate temperature.
Priority MAC based on Multi-parameters for IEEE 802.15.7 VLC in Non-saturation Environments
Vu Van Huynh,Le Nam-Tuan Le,Yeong Min Jang 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.3C
Priority MAC is an important issue in every communication system when we consider differentiated service applications. In this paper, we propose a mechanism to support priority MAC based on multi-parameters for IEEE 802.15.7 visible light communication (VLC). By using three parameters such as number of backoff times (NB), backoff exponent (BE) and contention window (CW), we provide priority for multi-level differentiated service applications. We consider beacon-enabled VLC personal area network (VPAN) mode with slotted version for random access algorithm in this paper. Based on a discrete-time Markov chain, we analyze the performance of proposed mechanism under non-saturation environments. By building a Markov chain model for multi-parameters, this paper presents the throughput and transmission delay time for VLC system. Numerical results show that we can apply three parameters to control the priority for VLC MAC protocol.
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>
Chemical Constituents of the Morinda tomentosa Leaves and their α-Glucosidase Inhibitory Activity
Vu, Huong Giang,Ninh, Khac Ban,Nguyen, Xuan Nhiem,Phan, Van Kiem,Chau Van, Minh,Hoang, Le Tuan Anh,Pham, Hai Yen,Bui, Huu Tai,Nguyen, Xuan Cuong,Nguyen, Hoai Nam,Kim, Seung Hyun,Kwon, Young-In,Kim, Yo Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
Le Duc Anh Ho,Hojun Kim(김호준),Vu Binh Nam,Daeho Lee(이대호) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We present a facile method for synthesizing a large-scale, well-dispersed copper oxide (CuO<SUB>x</SUB>) nanoparticle (NP) ink. The uniform CuO<SUB>x</SUB> thin films prepared using the synthesized NP ink by spin coating were applied to a laser digital patterning process, obtaining finely-structured Cu electrodes with the low resistivity of 10.5 μΩ cm. By controlling the software embedded in the laser scanning system, Cu-grid with a low sheet resistance (8.45 Ω·sq<SUP>−1</SUP>) and high transmittance (87.4% at 550 nm) were achieved. Furthermore, the effect of polyvinylpyrrolidone ratio, which was used as a dispersing agent in the NP ink and a reducing agent in the laser process, was carefully examined in detail. The superior stability of the Cu electrodes on the substrates was confirmed using various tests including bending and twisting, cyclic bending, and tape pull tests. Finally, a flexible transparent touchscreen panel based on Cu electrodes was fabricated to demonstrate a possible application.
Chemical Composition of Clausena lansium (Lour.) Skeels Leaves and Antifungal Activity
Vu Duc Nam,Fujimatsu Teruhisa,Takigawa Hirofumi,Kusuoku Hiroshi,Nguyen Minh Khoi,Le Viet Dung,Do Thi Ha,Hashimoto Hiroshi 한국생약학회 2016 Natural Product Sciences Vol.22 No.1
The first study on chemical constituents and biological activities of Clausena lansium (Lour.) Skeels (Rutaceae) growing in Vietnam has been done. Phytochemical investigation of n-hexane extract led to the isolation of five compounds: dihydroindicolactone (1), 8-geranyloxy psoralen (2), imperatorin (3), heraclenol (4) and indicolactone (5), in which this is the first report on the presence of dihydroindicolactone (1). Their structures were elucidated based on LC/MS/NMR hyphenated techniques as well as comparison with those of literature data. The n-hexane extract and its subfractions, ethanol 95% extract and several isolated compounds were evaluated for antifungal activity.
Low-Temperature Solution Process of Al-Doped ZnO Nanoflakes for Flexible Perovskite Solar Cells
Nam, SeongSik,Vu, Trung Kien,Le, Duc Thang,Oh, Ilwhan The Korean Electrochemical Society 2018 Journal of electrochemical science and technology Vol.9 No.2
Herein we report on the selective synthesis and direct growth of nanostructures using an aqueous chemical growth route. Specifically, Al-doped ZnO (AZO) nanoflakes (NFs) are vertically grown on indium tin oxide (ITO) coated flexible polyethylene terephthalate (PET) sheets at low temperature and ambient environment. The morphological, optical, and electrical properties of the NFs are investigated as a function of the Al content. Furthermore, these AZO-NFs are integrated into perovskite solar devices as the electron transport layer (ETL) and the fabricated devices are tested for photovoltaic performance. It was determined that the doping of AZO-NFs significantly increases the performance metrics of the solar cells, mainly by increasing the short-circuit current of the devices. The observed enhancement is primarily attributed to the improved conductivity of the doped AZO-NF, which facilitates charge separation and reduces recombination. Further, our flexible solar cells fabricated through this low temperature process demonstrate an acceptable reproducibility and stability when exposed to a mechanical bending test.