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- 저자 : Le Thi Mai Hoa (검색결과 5 건)
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Le Thi Mai Hoa,Dang Mau Chien,Kozo Ishizaki 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.6
The amorphous Fe73.5 Cu₁Nb₃Si₁₃.5B9 alloy was prepared by using a rapid solidification technique. The rapidly quenched alloy was annealed in various temperatures for 60 minutes. This annealing process made a series of partially crystallized samples with different crystallization fractions. The formation of the nanoparticles was observed by using transmission electron microscopy (TEM). The phases and the compositions were identifed by using X-ray diffraction (XRD). The microstructure of the annealed samples was composed of nanocrystalline Fe$_3$Si grains surrounded by a residual amorphous phase. The crystallization fraction of the samples was determined by using two methods: cryogenic heat capacity (CHC) and differential scanning calorimetry (DSC) measurements. The first method is a new method and allowed small changes in the amount of the crystalline phase to be determined. There was a difference of about 3 \% between the CHC and the DSC values. The amorphous Fe73.5 Cu₁Nb₃Si₁₃.5B9 alloy was prepared by using a rapid solidification technique. The rapidly quenched alloy was annealed in various temperatures for 60 minutes. This annealing process made a series of partially crystallized samples with different crystallization fractions. The formation of the nanoparticles was observed by using transmission electron microscopy (TEM). The phases and the compositions were identifed by using X-ray diffraction (XRD). The microstructure of the annealed samples was composed of nanocrystalline Fe$_3$Si grains surrounded by a residual amorphous phase. The crystallization fraction of the samples was determined by using two methods: cryogenic heat capacity (CHC) and differential scanning calorimetry (DSC) measurements. The first method is a new method and allowed small changes in the amount of the crystalline phase to be determined. There was a difference of about 3 \% between the CHC and the DSC values.
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Le, Van Phan,Nguyen, Tung,Park, Jong-Hyeon,Kim, Su-Mi,Ko, Young-Joon,Lee, Hyang-Sim,Nguyen, Van Cam,Mai, Thuy Duong,Do, Thi Hoa,Cho, In-Soo,Lee, Kwang-Nyeong Elsevier 2010 Veterinary microbiology Vol.145 No.3
<P><B>Abstract</B></P><P>Six field foot-and-mouth disease viruses (FMDVs), including four serotype O and two serotype Asia 1 strains, were collected from endemic outbreaks in 2005, 2006, and 2007 from four different provinces in Vietnam. The viruses were isolated and genetically characterized for their complete genomic sequences. The genetic analysis based on the complete genomic coding sequences revealed that the four serotype O FMDVs were related to each other, sharing 95.2% nucleotide (nt) identity and 97.5–97.6% amino acid (aa) identity. Genetic analysis and a phylogenetic tree, based on the VP1 gene of FMDV, showed that the four present Vietnamese serotype O strains have a high level of identity with other serotype O representatives of the Mya-98 lineage of the Southeast Asian (SEA) topotype. The four viruses were all clustered into the Mya-98 lineage of the SEA topotype, sharing 92.3–95.6% nt and 93.4–96.7% aa identity. This finding of the Mya-98 lineage was different from previous reports that the Vietnamese serotype O strains belonged to the Cam-94 lineage of the SEA topotype and two other topotypes, Middle East-South Asia (ME-SA) and Cathay. For the two serotype Asia 1 FMDVs, the genetic analysis based on the complete genomic coding sequences as well as on the VP1 gene revealed that they belonged to two genogroups, IV and V. Of note, the As1/VN/QT03/2007 strain of genogroup V, isolated in 2007, was very closely related to the pandemic Asia 1 strain which caused FMD outbreaks in China (Asia1/WHN/CHA/06, FJ906802) and Mongolia (Asia1/MOG/05, EF614458) in 2005, sharing 99.0–99.3% nt and 99.5–100% aa identity. In contrast, the second strain As1/VN/LC04/2005 of genogroup IV, isolated in 2005, was closely related to all referenced Vietnamese serotype Asia 1 strains found in the GenBank databases, sharing 86.4–100% nt and 90.9–100% aa identity with each. This study is the first description of the full-length genomic sequence of Vietnamese FMDV serotypes O and Asia 1 and may provide the evidence of the concurrent circulation of different serotypes and subtypes of FMDV in recent years in Vietnam.</P>
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Van Hoa Nguyen,Thi Mai Phung Bui,Thanh Phong Le,Hoang Tung Nguyen,Minh Tuyen Truong,Minh Nhut Do,Van Nha Duong 인간식물환경학회 2022 인간식물환경학회지 Vol.25 No.6
Background and objective: For countries vulnerable to climate change as Vietnam, indigenous knowledge (IK) might assist in revealing the values of local people's adaptations to environmental stresses and potentially support decision-making. Despite IK can provide the adaptive capacity of local people's activities within environmental contexts, but it is rapidly vanishing. This study aimed to describe the documentation of IK associated with climate change adaptation of farmers in the Vietnam Mekong Delta (VMD). Methods: We focused on collecting and establishing online access to IK documents through collaboration between IK holders, public sector, collecting institutions, and researchers in the five agro-ecological zones of the VMD. An online IK database for storing IK documents has been designed and implemented based on the web application schema. Results: Through interviews, we gathered IK from farming practices that are well-adapted to climate risks such as floods, droughts, and saltwater intrusions as well as traditional knowledge being used to forecast weather, flood, and saltwater intrusion. The database for storing IK documents has been successfully deployed using free and open-source software. The database currently contains more than 260 IK documents, with their location on agro-ecological zones displayed on a web-based map. Conclusion: We have captured and provided an online access to IK on climate change adaptation of the farmers in the VMD. This research is expected as an initial strategy for long-term sustainable development of the agriculture system in this region.
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Chemical Constituents of the Leaves of Glochidion obliquum and Their Bioactivity
Tran Dinh Thang,Ping-Chung Kuo,Chun-Shu Yu,Yuh-Chiang Shen,Le Thi Mai Hoa,Tran Van Thanh,Yao-Haur Kuo,Mei-Lin Yang,Tian-Shung Wu 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.3
A new flavonoid glycoside, globlin A (1), and eleven known compounds were isolated from methanolic extracts of the leaves of Glochidion obliquum. The structure of this new compound was established with a combination of 2D NMR techniques (COSY, NOESY, HMQC and HMBC) and HR-ESI-MS analyses. Chemical structures of the other known compounds were identified by comparison of their spectroscopic and physical data with those reported in the literature. Some of the isolates were examined for their bioactivities. Among the tested compounds, rotundic acid (4) displayed significant cytotoxicity and anti-inflammatory activities.
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