Effects of Maleic Anhydride Grafted Ethylene/Vinyl Acetate Copolymer (EVA)on the Properties of EVA/Silica Nanocomposites

Thai Hoang,Nguyen Thuy Chinh,Nguyen Thi Thu Trang,To Thi Xuan Hang,Dinh Thi Mai Thanh,Dang Viet Hung,하창식,Maëlenn Aufray 한국고분자학회 2013 Macromolecular Research Vol.21 No.11

Ternary nanocomposites based on ethylene/vinyl acetate copolymer (EVA), maleic anhydride-grafted EVA (EVAgMA), and nanosilica were prepared in a Haake Rheomixer. The structure of the EVA/EVAgMA/silica nanocomposites was characterized by Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The blending sequence was found to have a significant effect on the microstructure of EVA/EVAgMA/silica nanocomposites and the dispersion behavior of the nanosilica in the EVA matrix. The tensile properties (tensile strength and elongation at break), thermal behavior, crystalline structure and weatherability of the nanocomposites were also studied. The results showed that the above properties of the nanocomposites were enhanced remarkably using 1 wt% EVAgMA.

Development of a SCAR Marker Linked to Bacterial Wilt (Ralstonia solanacearum) Resistance in Tomato Line Hawaii 7996 Using Bulked-Segregant Analysis

Hai Thi Hong Truong,김수연,Hung Ngoc Tran,Thuy Thi Thu Nguyen,Long Tien Nguyen,Toan Kim Hoang 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.4

We report the development of a codominant sequence characterized amplified region (SCAR) marker linked to resistance to a Korean R. solanacearum isolate in tomato line Hawaii 7996. Bulked segregant analysis was employed for rapid identification of RAPD markers linked to resistance genes. Genomic DNA from six resistant F9 recombinant inbred lines (RILs) and six susceptible F9 RILs, which derived from a cross between S. lycopersicum Hawaii 7996 (resistant parent) and S. pimpinellifolium WVa 700 (susceptible parent) were pooled in to an R-pool and an S-pool, respectively. A total of 800 RAPD primers were screened and only six primers (UBC#176, 205, 287, 317, 350, and 676) showed polymorphism between R- and S- pools. Of these, only two markers UBC#176 and 317 revealed a 100% linkage in the individual plants comprising the contrasting bulks. Of these, the marker UBC#176 was converted into a co-dominant SCAR marker and designated as SCU176-534. The marker SCU176-534 was confirmed by genotyping the individual of the R- and S- pools and gave the same result as UBC#176. When the marker SCU176-534 was further validated for association with resistance and its potential for maker-assisted selection (MAS) in 92 tomato lines and cultivars, the results showed that none of these carries the resistance gene. Thus, SCAR marker SCU176-534 can be used in early selection of resistant lines when Hawaii 7996 is used as a parent in a breeding program.

Factors Affecting Financial Risk: Evidence from Listed Enterprises in Vietnam

DANG, Hang Thu,PHAN, Duong Thuy,NGUYEN, Ha Thi,HOANG, Le Hong Thi Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.9

This paper analyzes factors affecting enterprise's financial risk listed on the Vietnam stock market. The panel data of research sample includes 524 non-financial listed enterprises on the Vietnam stock market for a period of eleven years, from 2009 to 2019. The Generalized Least Square (GLS) is employed to address econometric issues and to improve the accuracy of the regression coefficients. In this research, financial risk is measured by the Alexander Bathory model. Debt structure, Solvency, Profitability, Operational ability, Capital structure are independent variables in the study. Firm Size, firm age, growth rate are control variables. The model results show that in order to prevent and limit financial risk for enterprises listed on the Vietnam Stock Market, attention should be paid to variables reflecting Liability structure ratio, Quick Ratio, Return on Assets, Total asset turnover, Accounts receivable turnover, Net assets ratio and Fixed assets ratio. The empirical results show that there are differences in the impact of these factors on the financial risk in state-owned enterprises and non-state enterprises listed on the Vietnam stock market. The findings of this article are useful for business administrators, helping business managers make the right financial decisions to improve the efficiency of financial risk management in enterprises.

Environmental Management Accounting Perception and Implementation in the Automobile Industry in Vietnam

TRAN, Ngoc Hung,HOANG, Thanh Hien,NGUYEN, Thi Thuy Hanh Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.12

This study aims to investigate the factors which impact the possibility of Environmental Management Accounting (EMA) implementation in automobile companies in Vietnam. A survey was carried out with automobile enterprises' managers, getting 198 usable respondents, with data and theoretical model analyzed by using SPSS with EFA method. Results indicated that in Vietnamese automobile enterprises, the possibility of EMA implementation was driven by elements including motivation to reduce production costs, reactions to environmental issues, compliance to legislation, procedures and processes in the working environment which they are in business. The government and professional institutions should play a vital role in promoting EMA practices by issuing specific guidelines and continuous training. Besides, tax authorities should apply the favor policies such as tax incentives to stimulate interest enterprises to implement EMA. However, this study's results only reflect about 63.7% of the impact to the implementation of EMA in Vietnamese automotive enterprises, so there are still some other factors that should be found out in the future researches. This is the first attempt to systematically analyze enterprises' perception and willingness to apply EMA in Vietnamese automobile industry. This study contributes to not only the existing empirical literature of EMA but also enterprises' managers in Vietnam and other transitional economies.

Chemical constituents of the Annona glabra fruit and their cytotoxic activity.

Hien, Nguyen Thi Thu,Nhiem, Nguyen Xuan,Yen, Duong Thi Hai,Hang, Dan Thi Thuy,Tai, Bui Huu,Quang, Tran Hong,Tuan Anh, Hoang Le,Kiem, Phan Van,Minh, Chau Van,Kim, Eun-Ji,Kim, Seung Hyun,Kang, Hee Kyoun Swets Zeitlinger 2015 PHARMACEUTICAL BIOLOGY Vol.53 No.11

<P>Traditional Chinese medicines have attracted increasing interest as potential sources of novel drugs with a wide range of biological and pharmacological activities. Annona glabra Linn (Annonaceae) is used in traditional medicine as an anticancer drug. Phytochemical investigation of this plant led to the isolation of acetogenins, ent-kauranes, peptides, and alkaloids. In addition, compounds exhibited anticancer, anti-HIV-reserve, and antimalaria.</P>

Potential Air Emission Sources and Modelling the Impact of Air Pollution on Public Health in Ho Chi Minh City for Policy Making and Awareness Creation using Machine Learning

Bang Quoc Ho,Hoang Ngoc Khue Vu,Thoai Tam Nguyen,Thi Thuy Hang Nguyen,Ricardo Simon Carbajo,Quan Le,Rajnish Rakholia 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10

Air in Ho Chi Minh city is polluted by PM2.5 (particle matter with the diameter is less than 2.5 μm, so-called PM2.5), O₃, CO, NO₂ and TSP which greatly affects public health. Ho Chi Minh City (HCMC) had 8,640,000 inhabitants with a total of 7,339,552 motorcycles and 637,323 automobiles. There are about 2,807 factories releasing air emission, 2,061,957 household and 5,096 restaurants in the city. A comprehensive study is required to evaluate causes of air pollution and the impacts of air pollution level to public health in this city. The aim of this study is to: (i) Application EMISENS model and other tools to calculate air emission in HCMC and (ii) Modelling the Impact of Air Pollution on Public Health in Ho Chi Minh City for Policy Making and Awareness Creation using Machine Learning. The results showed that comprehensive EI and GHG over HCMC in 2019 was conducted in this project by following the top-down and bottom-up approaches and IPCC-2006 methodology. The estimation of the emission of different types of sources including line, point, area, and the biogenic source was conducted. Traffic sources accounted for the largest emissions for almost all pollutants. Motorcycles were the dominant emission source of all pollutants for on-road sources, accounting for 35.3%, 91.4%, 65.4%, 70.4%, 99.4% and 79.9% of the total line sources emissions for NOx, CO, SOx, NMVOC, CH₄ and PM2.5, respectively. Industrial activities contributed the highest emission of PM2.5 about 39.7% of the total of PM2.5 in HCMC in 2019. The area sources accounted for 38.9% of TSP and 23.5% of PM2.5 in HCMC, whereas, others were negligible sources. Biogenic sources, particularly from greenery, agriculture, mangroves, etc. of the HCMC emitted 4.6% of total NMVOC emissions of the whole city. Motorcycles contributed the highest emission of PM2.5 for all single sources of emission in HCMC. For PM2.5, motorbikes contribute 24.5% of HCMC"s total PM2.5 emissions, Households, Textiles, Metal Production, Food, Restaurants, Seaports, Manufacturing Paper respectively is 15.1, 10.0, 9.1, 6.8, 6.7, 5.8 and 3.8, respectively. With SO₂, motorcycles, Thermo-electricity, Seaports, Textile, Cars, Food, Metal production and HDVs contribute 24.6, 20.7, 11.7, 8.6, 6.6, 5.5, 5.0 and 3.8% of total SO₂ emission of HCMC. Study also develop air quality automatically monitoring network and install 6 air quality stations around HCMC, then apply Machine Learning to analysis/extrapolate hourly air quality data for HCMC, then modeling the the Impact of air Pollution on hospital admission in HCMC. The 13 measure to reduce air pollutants should be based on this detailed EI emission.

Labdane-Type Diterpenoids from the Rhizomes of <i>Hedychium coronarium</i> Inhibit Lipopolysaccharide-Stimulated Production of Pro-inflammatory Cytokines in Bone Marrow-Derived Dendritic Cells

Kiem, Phan Van,Anh, Hoang Le Tuan,Nhiem, Nguyen Xuan,Minh, Chau Van,Thuy, Nguyen Thi Kim,Yen, Pham Hai,Hang, Dan Thuy,Tai, Bui Huu,Mathema, Vivek Bhakta,Koh, Young-Sang,Kim, Young Ho The Pharmaceutical Society of Japan 2012 Chemical & pharmaceutical bulletin Vol.60 No.2

<P>The rhizomes of <I>Hedychium coronarium</I> have been used for the treatment of inflammation, skin diseases, headache, and sharp pain due to rheumatism in traditional medicine. From this plant, two new labdanes, 15-methoxylabda-8(17),11<I>E</I>,13-trien-16,15-olide (<B>1</B>) and 16-methoxylabda-8(17),11<I>E</I>,13-trien-15,16-olide (<B>3</B>), named hedycoronens A and B, as well as four known, labda-8(17),11,13-trien-16,15-olide (<B>2</B>), 16-hydroxylabda-8(17),11,13-trien-15,16-olide (<B>4</B>), coronarin A (<B>5</B>), and corronarin E (<B>6</B>) were isolated. Their chemical structures were elucidated by mass, 1D- and 2D-nuclear magnetic resonance (NMR) spectroscopy. They were evaluated for inhibitory effects on the lipopolysaccharide (LPS)-stimulated production of pro-inflammatory cytokines in bone marrow-derived dendritic cells. Among of them, compounds <B>1</B>—<B>3</B> were potent inhibitors of LPS-stimulated interleukin-6 (IL-6) and IL-12 p40, with IC<SUB>50</SUB> ranging from 4.1±0.2 to 9.1±0.3 μ<SMALL>M</SMALL>. Compounds <B>1</B> and <B>3</B> showed moderate inhibitory activity on the tumor necrosis factor-α (TNF-α) production with IC<SUB>50</SUB> values of 46.0±1.3 and 12.7±0.3 μ<SMALL>M</SMALL>. The remains of compounds showed inactivity. These results warrant further studies concerning the potential anti-inflammatory benefits of labdane-diterpenes from <I>H. coronarium</I>.</P>

Improvement of Anthocyanin Encapsulation Efficiency into Yeast Cell by Plasmolysis, Ethanol, and Anthocyanin Concentration Using Response Surface Methodology

( Lieu My Dong ),( Hoang Thi Thuy Hang ),( Nguyen Huyen Nguyet Tran ),( Dang Thi Kim Thuy ) 한국미생물 · 생명공학회 2020 한국미생물·생명공학회지 Vol.48 No.3

Anthocyanins are antioxidant compounds susceptible to environmental factors. Anthocyanin encapsulation into yeast cells is a viable solution to overcome this problem. In this study, the optimal factors for anthocyanin encapsulation were investigated, including anthocyanin concentration, plasmolysis contraction agent, and ethanol concentration, and response surface methodology was evaluated, for the first time. Anthocyanin from Hibiscus sabdariffa L. flowers was encapsulated into Saccharomyces cerevisiae using plasmolysis contraction agent (B: 3%-20% w/v), ethanol concentration (C: 3%-20% v/v), and anthocyanin concentration (A: 0.15-0.45 g/ml). The encapsulation yield and anthocyanin loss rate were determined using a spectrometer (520 nm), and color stability evaluation of the capsules was performed at 80℃ for 30 min. The results of the study showed that these factors have a significant impact on the encapsulation of anthocyanin, in which ethanol agents have the highest encapsulation yield compared to other factors in the study. Statistical analysis shows that the independent variables (A, B, C), their squares (A², B², C²), and the interaction between B and C have a significant effect on the encapsulation yield. The optimized factors were anthocyanin, 0.25 g/ml; NaCl, 9.5% (w/v); and ethanol, 11% (v/v) with an encapsulation yield of 36.56% ± 0.55% and anthocyanin loss rate of 15.15% ± 0.98%; This is consistent with the expected encapsulation yield of 35.46% and loss rate of 13.2%.

Effect of nanostructured MoS2 morphology on the glucose sensing of electrochemical biosensors

Dinh Van Tuan,Dang Thi Thuy Ngan,Nguyen Thi Thuy,Hoang Lan,Nguyen Thi Nguyet,Vu Van Thu,Vuong-Pham Hung,Phuong Dinh Tam 한국물리학회 2020 Current Applied Physics Vol.20 No.9

In this study, the effects of the morphological characteristics of MoS2 nanomaterials on the glucose sensing of electrochemical biosensors were explored. Nanostructured MoS2 materials, including nanoparticles (NPs), nanoflowers (NFs), and nanoplatelets (NPLs), were prepared via a simple hydrothermal method. The structure and morphological characteristics of MoS2 nanomaterials were examined through X-ray diffraction, field emission scanning electron microscopy, and Raman spectroscopy. Electrochemical properties were analyzed through cyclic voltammetry. Results showed that the obtained sensitivity was 64, 68.7, and 77.6 μAmM 1 cm 2 for MoS2 NP-, MoS2 NF-, and MoS2 NPL-based biosensors, respectively. The limit of detection (LOD) of all MoS2-based glucose biosensors was 0.081 mM. In addition, the pH, temperature, glucose oxidase (GOx) concentration, reproducibility, specificity, and stability of glucose biosensors with different MoS2 morphologies were also investigated and indicated the oxidation current response of the MoS2 NPL-based glucose biosensor was higher than that of MoS2 NF- and NP-based biosensors.

Characterization of Ag-Doped p-Type SnO Thin Films Prepared by DC Magnetron Sputtering

Pham, Hoai Phuong,Thuy, Thanh Giang Le,Tran, Quang Trung,Nguyen, Hoang Hung,My Hoa, Huynh Tran,Thi Thu, Hoang,Cuong, Tran Viet Hindawi Limited 2017 Journal of nanomaterials Vol.2017 No.-

<P>Crystalline structure and optoelectrical properties of silver-doped tin monoxide thin films with different dopant concentrations prepared by DC magnetron sputtering are investigated. The X-ray diffraction patterns reveal that the tetragonal SnO phase exhibits preferred orientations along (101) and (110) planes. Our results indicate that replacing Sn<SUP>2+</SUP> in the SnO lattice with Ag<SUP>+</SUP> ions produces smaller-sized crystallites, which may lead to enhanced carrier scattering at grain boundaries. This causes a deterioration in the carrier mobility, even though the carrier concentration improves by two orders of magnitude due to doping. In addition, the Ag-doped SnO thin films show a p-type semiconductor behavior, with a direct optical gap and decreasing transmittance with increasing Ag dopant concentration.</P>