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- 저자 : M.T. Vu (검색결과 22 건)
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Effect of Water Stress on the Growth and Physiology of Coffee Plants
( Vu,N. T. ),( J. M. Park ),( A. T. Tran ),( T. K. Bui ),( D. C. Vu ),( D. C. Jang ),( I. S. Kim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2018 강원 농업생명환경연구 Vol.30 No.3
Water stress effects on the growth and physiology of three coffee species, arabica, robusta, and liberica, were investigated. Unlike in plants that had water supply, plant height, leaf length, and leaf width values decreased significantly in arabica and liberica in a water deficit condition but did not statistically differ in robusta coffee plants. The highest values of reduction in growth characteristics of coffee plants under water deficit condition were observed in arabica, but they did not significantly differ from those in robusta or liberica. The highest value of relative water content in a water deficit condition was observed in liberica, but it was similar to that of robusta. The SPAD value and Fv/Fm of all coffee species decreased significantly during the period without irrigation but increased significantly after re-watering. SPAD values of robusta and liberica in a water deficit condition were higher than those of arabica. The highest value of relative ion leakage during drought was observed in arabica. On the other hand, robusta generally appeared to be more vigorous than arabica and liberica, as shown by its relatively lower percentage of wilting plants and higher percentage of recovering plants.
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Ho, K.,Jin, S.,Zhong, M.,Vu, A.T.,Lee, C.H. Elsevier Science Publishers 2017 Materials chemistry and physics Vol.198 No.-
Mesoporous magnesium oxides with a high surface area (672-686 m<SUP>2</SUP>/g) were synthesized by an aerogel method and subsequently evaluated for CO<SUB>2</SUB> capture efficiency under ambient-temperature sorption and intermediate-temperature regeneration. The effects of one-step (MgO-1) and four-step (MgO-4) calcination methods on the as-prepared MgO samples were evaluated with respect to textual properties and CO<SUB>2</SUB> sorption capacity at various temperatures (30-350 <SUP>o</SUP>C). The as-prepared MgOs showed greater than 10 wt% of CO<SUB>2</SUB> sorption at 30 <SUP>o</SUP>C, showing very fast sorption of more than 7 wt% CO<SUB>2</SUB> within 5 min. The cyclic stability of the sorbents was tested by using CO<SUB>2</SUB> sorption at 30 <SUP>o</SUP>C and N<SUB>2</SUB> regeneration at 450 <SUP>o</SUP>C. The sorption performance of MgO-1 was more stable and higher than that of MgO-4, but the surface area and pore volume were still reduced. The cyclic sorption capacity became 6.1 wt% at the condition of mixture gas sorption (CO<SUB>2</SUB>/N<SUB>2</SUB>: 15/85 vol%) and CO<SUB>2</SUB> regeneration. Since inter-crystallites coupling plays an important role in pore formation as well as stability, calcination condition can contribute to preventing the degradation level of performance and textural properties of sorbents.
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Vu, T.M.,Park, J.,Kwon, O.B.,Bae, D.S.,Yun, J.H.,Keel, S.I. Pergamon Press ; Elsevier Science Ltd 2010 International journal of hydrogen energy Vol.35 No.8
Experiments were conducted in a constant pressure combustion chamber using schlieren system to investigate the effects of carbon dioxide-nitrogen-helium diluents on cellular instabilities of syngas-air premixed flames at room temperature and elevated pressures. The cellular instabilities for the diluted syngas-air flames were interpreted and evaluated in the viewpoint of the hydrodynamic and diffusional-thermal instabilities. Laminar burning velocities and Markstein lengths were calculated by analyzing high-speed schlieren images at various diluent concentrations and equivalence ratios. The measured unstretched laminar burning velocities were compared with the predicted results computed using the PREMIX code with the kinetic mechanism developed by Sun et al. Also, experimentally measured Peclet numbers were compared with the predicted results for fuel-lean flames. Experimental results showed substantial reduction of the laminar burning velocities and of the Markstein lengths with the diluent additions in the fuel blends. Effective Lewis numbers of helium-diluted syngas-air flames increased but those of carbon dioxide- and nitrogen-diluted syngas-air flames decreased in increase of diluents in the reactant mixtures. With helium diluent, the propensity for cells formation was significantly diminished, whereas the cellular instabilities for carbon dioxide- and nitrogen-diluted syngas-air flames were not suppressed.
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M. T. Vu,V. S. Raghavan,S.-Y. Liong 대한토목학회 2015 KSCE Journal of Civil Engineering Vol.19 No.2
This study focuses on the Hydro-Meteorological Drought assessments by Ensemble Climate Projections from a regional climatemodel (Weather Research and Forecasting, WRF) that downscaled 3 Global Climate Models under a baseline period (1961-1990)and under a future scenario A2 for 2071-2100. The Meteorological Drought is assessed using the Standardized Precipitation Index(SPI) while the Hydrological Drought is analyzed by using both the semi-distributed hydrology model SWAT and StandardizedRunoff Index (SRI). The catchment under study is a small river basin lying on the Central Highland area of Vietnam. This area is thesource for perennial plantation which produces most of the coffee for Vietnam making it the world’s second most exporter of coffeenext to Brazil. Additionally, this region is also one of the important sources for hydropower of Vietnam and one of the maintributaries for the Mekong river at the downstream. This region has been known prone to drought, especially during dry seasons ofMarch and April. Therefore, simulating drought for this area is significant to study the water supply and water balance for the regionfor future planning and adaptation.
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Duong, T.T.,Tuan, T.Q.,Dung, D.V.A.,Van Quy, N.,Vu, D.L.,Nam, M.H.,Chien, N.D.,Yoon, S.G.,Le, A.T. Elsevier 2014 CURRENT APPLIED PHYSICS Vol.14 No.12
Polyaniline nanowires (PANI NWs) were deposited onto fluorine-doped tin oxide (FTO) glass substrate using the cyclic voltammetric method with aniline monomer precursor in HCl aqueous solution. The secondary oxidation peak plays an important role in polymerization of aniline monomer and the optimization of catalytic activity of PANI-based counter electrodes was achieved by controlling the number of cycles. The photovoltaic performance of the dye-sensitized solar cells (DSSCs) with PANI NWs counter electrodes (CEs) was optimized at 4th cycles, and then following parameters were obtained: J<SUB>sc</SUB> = 17.2 mA cm<SUP>-2</SUP>, V<SUB>oc</SUB> = 0.71 V, FF = 59.3%, and efficiency (η) = 7.24%. While, J<SUB>sc</SUB> = 14.7 mA cm<SUP>-2</SUP>, V<SUB>oc</SUB> = 0.77 V, FF = 70.6%, and efficiency (η) = 7.98% in cells with Pt CEs. The PANI NWs were attractive as an alternative CEs for the low-cost DSSCs instead of Pt.
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Baik, M.,Vu, T.T.T.,Piao, M.Y.,Kang, H.J. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.10
Epigenetic factors, such as DNA methylation status, may regulate adipogenesis and lipogenesis, thus affecting intramuscular fat (IMF) deposition in longissimus dorsi muscle (LM) of beef cattle. In Korean cattle steers, the LM consists mainly of muscle tissue. However, the LM tissue also contains IMF. We compared the gene expression levels between the IMF and muscle portions of the LM after tissue separation. Real-time polymerase chain reaction analysis showed that the mRNA levels of both adipogenic peroxisome proliferator-activated receptor gamma isoform 1 (PPARG1) and lipogenic fatty acid binding protein 4 (FABP4) were higher (p<0.01) in the IMF than in the muscle portion of the LM. We determined DNA methylation levels of regulatory regions of the PPARG1 and FABP4 genes by pyrosequencing of genomic DNA. DNA methylation levels of two of three CpG sites in the PPARG1 gene promoter region were lower (p<0.05) in the IMF than in the muscle portion of the LM. DNA methylation levels of all five CpG sites from the FABP4 gene promoter region were also lower (p<0.001) in the IMF than in the muscle portion. Thus, mRNA levels of both PPARG1 and FABP4 genes were inversely correlated with DNA methylation levels in regulatory regions of CpG sites of the corresponding gene. Our findings suggest that DNA methylation status regulates tissue-specific expression of adipogenic and lipogenic genes in the IMF and muscle portions of LM tissue in Korean cattle.
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Design, synthesis and biological evaluation of novel hydroxamic acids bearing artemisinin skeleton
Ha, V.T.,Kien, V.T.,Binh, L.H.,Tien, V.D.,My, N.T.T.,Nam, N.H.,Baltas, M.,Hahn, H.,Han, B.W.,Thao, D.T.,Vu, T.K. Academic Press ; Academic Press 2016 Bioorganic chemistry Vol.66 No.-
<P>A series of novel hydroxamic acids bearing artemisinin skeleton was designed and synthesized. Some compounds in this series exhibited moderate inhibition against the whole cell HDAC enzymes. Especially, compound 6g displayed potent cytotoxicity against three human cancer cell lines, including HepG2 (liver cancer), MCF-7 ( breast cancer) and HL-60 (leukemia cancer), with IC50 values of 2.50, 2.62 and 1.28 mu g/mL, respectively. Docking studies performed with two potent compounds 6a and 6g using Autodock Vina showed that both compounds bound to HDAC2 with relatively high binding affinities from -7.1 to 7.0 kcal/mol compared to SAHA (-7.4 kcal/mol). It was found in this research that most of the target compounds seemed to be more cytotoxic toward blood cancer cells (HL-60) than liver (HepG2), and breast (MCF-7) cancer cells. (C) 2016 Elsevier Inc. All rights reserved.</P>
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Awad, Y.M.,Lee, S.E.,Ahmed, M.B.M.,Vu, N.T.,Farooq, M.,Kim, I.S.,Kim, H.S.,Vithanage, M.,Usman, A.R.A.,Al-Wabel, M.,Meers, E.,Kwon, E.E.,Ok, Y.S. Butterworth-Heinemann, Ltd 2017 Journal of cleaner production Vol.156 No.-
A hydroponics system developed using a nutrient film technique was used to evaluate the effectiveness of rice husk biochar (RB) alone or in combination with perlite (PL) as substrates for increasing the growth of leafy vegetables compared with that of PL. Seedlings of cabbage, dill, mallow, red lettuce, and tatsoi were grown hydroponically in PL, RB, and PL + RB (1:1 ratio of PL to RB, v/v) substrates for a 30-d under optimal environmental conditions in a greenhouse. Shoot length and fresh/dry masses of cabbage, dill, and red lettuce plants grown in RB substrate were decreased by 49% on average compared to those plants grown in PL substrate. In contrast, PL + RB substrate led to approximately 2-fold increases in shoot length, number of leaves, and fresh/dry masses of leafy vegetable plants compared with those grown in PL substrate. Foliar nutritional composition (Ca, Mg, K, Na, Mn, Fe, and Zn) and nitrogen status (SPAD index) of plants grown in PL + RB and PL substrates suggested the presence of optimal growth conditions for ensuring optimum yield with high quality. In addition, RB substrate contributed to respective increases of 1.2-3.5-fold in leaf K, Mg, Mn, and Zn contents in most vegetable plants compared with those grown in PL substrate. The RB alone or in combination with PL substrates decreased algal growth in the nutrient solutions as confirmed by scanning electron micrographs of microalgae on the RB surface. The results also indicated that use of PL + RB hydroponic substrate could be an alternative and effective technology for the better management of unwanted algal growth in nutrient solutions and high production of leafy vegetables.
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