The purpose of this study was to prepare ZnO nanofibers based on carbon with precursors of polyvinyl pyrrolidone (PVP) and zinc nitrate (Zn(NO3)2) by an electrospinning method. The electrospinning parameters of PVP/Zn(NO3)2 were investigated, including the concentration of PVP, amount of Zn(NO3)2, applied voltage, and flow rate. The morphology of electrospun nanofibers was observed under a scanning electron microscope (SEM). At the optimum condition, the electrospun PVP/Zn(NO3)2 nanofibers were calcinated in nitrogen at 500°C for 1 hour to covert  ZnO nanoparticles based on carbon fibers. The morphology and size of ZnO nanoparticles based on carbon nanofibers were determined by a transmission electron microscope (TEM). The formation of ZnO crystals in the ZnO/carbon fibers was determined by Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Thus, ZnO nanoparticles based on carbon fibers were succesfully prepared.

The efficiency of striped catfish production was evaluated by Cobb-Douglas stochastic production frontier model. The technical efficiency (TE) was estimated in average of 69%, in which, the TE of certified farms was higher than non-certified farms (77% compared to 65%). The productivity losses due to inefficient use of the inputs were 262 tons/ha/crop, in which for the non-certified and certified groups were 295 tons/ha/crop and 182 tons/ha/crop, respectively. The main reason is that farmers used inputs ineffectively and unreasonably. Input factors that affected (positive correlation) production efficiency included stocking density, FCR, labor days, drugs, and chemical costs. Factors resulted in inefficiency of production included the number of trainings, treatment ponds, grow-out ponds, and culture period.

Similar to other invertebrates, shrimp lectin repertoires are ample and complex. Until now, seven lectin families have been identified in shrimp. Considering their abundance and diversity, C-type lectin (CTL) occupies important positions in the shrimp immune system. It plays important roles in innate immune responses as pattern recognition receptors, opsonins, and involved in cell signaling. Recently, a CTL from white leg shrimp Litopenaeus vannamei was identified able to agglutinate Vibrio parahaemolyticus, which is the causative agent of acute hepatopacreatic necrosis disease (AHPND) in shrimp. The application of genetic engineering and recombinant protein for enhancing CTL expression when using as supplemented probiotics in feed is an approach that helps prevent bacteria in general and V. parahaemolyticus in particular. This review proposes a specific approach from genes to recombinant proteins and discuss the potential appications of C-type lectin from white leg shrimp L. vannamei in prevention of AHPND-causing V. parahaemolyticus in farmed shrimp.

The study aimed to determine the optimal energy ratio (protein/lipid) for snakehead fish (Channa striata) fingerlings 6.5 g cultured in two environmental conditions, 28oC-0‰ and high temperature and salinity (34oC-9‰). There were six diet treatments consisting three levels of protein (40, 45 and 50%) and two levels of lipid (7 and 10%) corresponding and the dietary ratios energy originated from protein/lipid 3.41; 3.36; 3.82; 2.49; 2.71 and 3.03, respectively over a 60-day period. The results showed that the high temperature and salinity (34oC-9‰) of cultured environment significantly reduced the survival rate, growth, feed intake, FCR, the utilization efficiency, and retention of nutrients (protein and lipid), but did not affect HSI (hepatosomatic index) of snakehead. The dietary ratio of energy originated from protein and lipids influenced growth, the utilization efficiency, and retention of nutrients (protein and lipid). The optimal dietary ratio of energy protein/lipid for snakehead is 3.5 at the cultured condition 28oC-0‰, and 3.37 at high temperature and salinity (34oC-9‰).

This study aims to identify livelihoods of the communitities in buffer zone of U Minh Thuong national park, to find out solutions to enhance community incomes for limiting illegal natural resource exploitation, to protect biodiversity in the national park. The contents include identifying the status social economic and income sources of the communities, analyzing advantages/disadvantages, proposing recommendation for managers to increase incomes for the communities. The study was carried out from September to December 2019. Database and information were collected from secondary data and interviewing 100 households, who are living in buffer zone of the national park, including mainly incomes, social security, satisfied levels and their comments. It was found that incomes of the households from agriculture occupied 20-80% of total income of the family. Income of the communties is low due to natural condition, lack of investment and techniques. This problem has created illegal potential exploitiation, it can cause negative impacts to biodiversity in the national park.

The study was conducted to evaluate effects of dietary β-glucan supplementation on immune parameters and susceptibility of white leg shrimp (Litopenaeus vannamei) to acute hepatopancreatic necrosis disease (AHPND). White leg shrimps (1.8 ± 0.51 g/shrimp) were randomly distributed in 15 plastic tanks (30 shrimp/tank) with five treatments (TM) (in triplicate): (TM1) unchallenged control and no β-glucan supplementary feeding; (TM2) unchallenged and β-glucan supplementary feeding; (TM3) challenged control and no β-glucan supplementary feeding; (TM4) challenged and β-glucan supplementary feeding β-glucan for 7 days before challenge, and (TM5) challenged and β-glucan supplementary feeding (7 days before challenge and 7 days after challenge). After 14 days of post challenge, shrimp in TM3 had significantly higher cumulative mortality (46.7 ± 1.9%) (P0.05), and cumulative mortalities of these treatments were significantly different compared to TM1 and TM2 (P

This study was conducted to observe the impact of dietary supplementation of Pseuderanthemum palatiferum (Wall.) Radlk leaf extract on growth and non-specific immune response of striped catfish (Pangasianodon hypophthalmus). The experiment was randomly designed with 4 triplicated treatments including 0%, 0.02%, 0.1%, and 0.5% Pseuderanthemum palatiferum (Wall.) Radlk leaf extract. Total red blood cells, total white blood cells, lymphocytes, monocytes, neutrophils, thrombocytes and lysozyme activities were observed for immune responses at the 3rd and the 6th week  post-feeding and the 3rd day post challenge with pathogenic bacteria. The results showed that the treatments of supplemented 0.02%, 0.1%, and 0.5% extract did not significantly affect the growth of striped catfish. The total red blood cell and total white blood cell counts significantly increased in supplemented extract treatments if compared to the control. After 6-week feeding, lysozyme activity was highest (90,7 mg/mL) in treatment of 0.5%. After challenge with Edwardsiella ictaluri, the results indicated that mortality rates in 0.1% and 0.5% treatments were lower than those of the control treatment. These results suggested that the supplemention of Pseuderanthemum palatiferum (Wall.) Radlk leaf extract in diets could improve the immune responses and reduce the mortality of striped catfish after being challenged with E. ictaluri.

Fish protein hydrolysate was produced from Tra catfish flesh by using alcalase and flavourzyme enzyme mixture at pH 6.5 -7.0, hydrolysis temperature 55°C and an alcalase and flavourzyme ratio of 1:3. The result showed that the optimal hydrolysis condition as the ratio between enzyme mixture to fish flesh and hydrolysis time was 0.2% (v/w) and 26 hours. Peptide content, nitrogen amino acid content, and NH3-N in obtained fish protein hydrolysate were 21.1 g/L, 10.2 g/L and 0.472 g/L. Fish seasoning powder was produced by mixing fish protein hydrolysate and sugarcane juice at the ratio of sugarcane juice: fish protein hydrolysate of 20%: 45% (w/w). Sensory score, protein content, moisture content and recovery yield in fish seasoning powder were 18.2, 17.6%, 4.27% and 39.7%. The product still remained good sensory quality, moisture content, and total aerobic bacteria in acceptable level after four weeks of storage at room temperature.

The aim of this study is to examine the relationship between the service marketing mix, tourist satisfaction and tourist loyalty. The participants are domestic the tourists choosing Con Phung resort in Ben Tre province as a destination. The scales were assessed by Cronbach's Alpha coefficient, exploratory factor analysis, confirmatory factor analysis and the hypotheses were tested through structural equation model. The results of the research confirm that all service marketing mix’s elements (price, product, place, promotion, process, people, and physical evidence) show significant positive effects on tourist sarisfaction and loyalty. Some suggested implications were developing travel products, human resource, advertising strategies and strengthening physical evidences for enticing more tourists to Con Phung Resort destination in Ben Tre province. Limitation and suggestions for future studies were also proposed.

This study is aimed at testing the the impact of corporate social responsibility (CSR) on employee-related important variables in businesses. In particular,the relationship between CSR and employee commitmentwith enterpreneurs inthe linking role of job satisfaction, trust and engagementwas investigated. The partial least square structural equation modelling was applied on a sample set of 330 employees to test the hypotheses. The testing results indicated that all proposed CSR hypotheses were fit and supported by employees in Tien Giang province.

The study was conducted from February 2018 to June 2019 in four main provinces of striped catfish farming in the Mekong Delta including An Giang, Dong Thap, Vinh Long and Can Tho. Structured questionaries with the stratified random sampling were used to collect data from 271 striped catfish farms with different linkage models. Binary logistic regression model was used to analyze factors affecting the linkage models. The results from the regression model identified four factors that affect the linkage model arranged from high to low importance including educational level of farm owner, farming area, profitability and operational costs. However, the share of benefit and risk among related actors should be considered as important factors for a long-term linkage of the model. In addition, striped catfish farms had a contract with processing plants obtained the highest yield (517 tons/ha/crop) and profit margin (17.1%) if compared to those of other linkage models.

This study is aimed to evaluate adsorption behavior of Cr(VI) ion in aqueous solution by using  Fe3O4@SiO2 with SiO2 derived from rice husk ash. The magnetic synthesized absorbent is generated at simple, inexpensive and environmentally friendly conditions. Scanning electron microscope (SEM) analysis illustrated that SiO2 nanoparticles, Fe3O4 N nanoparticles and Fe3O4@SiO2 particles were in fairly spherical shape with diameter in a range of 5 nm to 10 nm, 30 nm to 50 nm and 100 nm to 500 nm, respectively. The experimental results showed that Fe3O4@SiO2 particles could remove 92.49% of Cr(VI) at conditions of pH 2.5, contact time of 30 min, Fe3O4@SiO2 mass of 0.1 g, and Cr(VI) initial concentration of 100 mg/L. The adsorption of Cr(VI) ion onto the absorbent can be considered as monolayer physisorption onto heterogeneous surface with maximum adsorption capacity of 166.67 mg/g. The bonding energy of adsorbent and adsorbate is 7.1795 kJ/mol, and CrxFe1-x(OH)3 precipitates is adsorbed into pores of SiO2 shell can be examined as the main mechanism of the adsorption.

In the cucumber hybrid breeding process, the use of gynoecious lines as a maternal line has many advantages such as decreasing the breed confusion caused by self-pollination, requiring lesss labor for removing male or covering female flowers, making use of insects for pollinating, and ensuring high yield. Molecular marker is a useful tool to early and accurately identify cucumber gynoecious lines. This study investigated the correlation between the two molecular markers e.g. SSR13251 and SSR18956 with the sex of flowers of 50 pure cucumber samples (19 gynoecious lines, 31 monoecious lines). PCR reactions were performed to amplify the target sequences. The results showed that SSR13251 marker did not distinguish the different cucumber lines. Meanwhile, the PCR product size of SSR18956 marker differed among cucumber lines that helped to exactly identify the gynoecious lines. After screening 50 pure cucumber samples with SSR18956 marker, the compatibility between this marker and the sexual phenotype of cucumber flowers was 84%. Therefore, the SSR18956 marker could be a potential marker to identify the gynoecious lines in cucumber.

Adipose-derived stem cells have immunomodulation and the ability to differentiate into matured cells and repair damaged organs in body. This research is aimed to evaluate the impact of adipose-derived stem cells on wound healing in Swiss mice. After being ulcerated, 15 mice had been randomly divided into three groups: NaCl injection, 1×106 adipose-derived mononuclear cells (MNADSCs) injection and 1×106 adipose derived stem cells (ADSCs) injection. All groups were injected into caudal vein, tracked for 13 days continuously and assessed the ability to heal by wound morphology and histological anatomy. The research results showed that the group of mice grafted cells healed the wound faster than the control group; in the group of ADSCs, the wound was healed fastest and completely after 9 days of transplantation. In conclusion, adipose-derived stem cells have important meaning for the wound treatment, especially adipose-derived mesenchymal stem cells.

Diarrhea caused by Enterotoxigenic Escherichia coli (ETEC) causes weight loss, slow growth or death, leading to economic losses. Currently, there is no effective vaccine to prevent ETEC. Toxoid vaccines are based on the most common ETEC enterotoxin - STb. which is poor immunogenicity, To solve the problem, STb was fused with B subunit of enterotoxin LT to enhance the immunogenicity of STb. and increase the spectrum of ETEC vaccine. In this study, gene estB (encoding for STb) and plasmid pET28a-eltB were treated simultaneously with HindIII and XhoI, after that, were ligated by T4 ligase to form pET28a-eltB-estB then were confirm by DNA sequencing. The recombinant plasmid was transformed into E. coli BL21 (DE3) strain and evaluated the protein expression by, SDS - PAGE and Western blot with 6xHis probe. In result, LTB-STb was successfully cloned and expressed in inclusion bodies, create a source for further immunogenicity experiments.

The study was aimed to investigate the antioxidant and antimicrobial ability against Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Lactobacillus acidophilus of fractional extract from the leaves of Elaeocarpus hygrophilus Kurz. by silica gel column chromatography. Four fractions are F1 (dichloromethane : ethyl acetate ratio 1 : 1 (v/v)); F2 (acetone : ethyl acetate ratio 9 : 1 (v/v)), F3 (acetone), F4 (methanol). The results of experiment revealed that the highest recovery efficiency in F4 (20.32%). The flavonoid content (211.33 mg QE/g extract) was highest in F1. The total polyphenol content (465.38±2.15 mg GAE/g extract), total tannin (782.80±17.07 mg TAE/g extract) were highest in F2. The highest reduction ability of H2O2, Fe3+ was in F2 with IC50 values ​​of 20.81±0.06 and 7.40±0.12 (µg/mL), respectively. All fractions were antibacterial (concentration of 100 mg/mL, 24 hrs). The highest antibacterial activity was in F2 with the zones of inhibition E. coli (9.8±0.3 mm); S. aureus (4.9±0.1 mm); B. subtilis (5.8±0.3 mm) (insignificant difference between F1 and F2); L. acidophilus (5.8±0.8 mm). MIC values were E. coli (0.5 mg/mL), B. subtilis (1.0 mg/mL). MBC value was E. coli (1.5 mg/mL). The experiment revealed that all fractions are antioxidant and antibacterial activities, of which F2 is most effective.

Developing the business value of e-banking services’ quality is an important aspect in the digital era. A survey of 389 customers in Nha Trang city was done to clarify the impact of e-banking service quality on customer’s satisfaction. Through exploratory factor analysis, confirmatory factor analysis and structural equation modeling, five factors that directly affect the quality of e-banking services include design characteristics, security, reliability, information quality, and response time. Besides, the results showed that the quality of e-banking service directly affects customers’ satisfaction. The solutions have proposed for improving the quality of e-banking services and increasing customers’ satisfaction. Implications were discussed to improve quality of e-banking services in order to increase customer’s satisfaction.

This study is aimed to measure the total factor productivity growth (TFPG) of agricultural sector of the Mekong Delta region during the period of 1990 – 2015 as well as decompose it into technical change, technical efficiency change and scale efficiency change. With Malmquist TFP index as non – parametric approach (DEA), the result indicated that the contribution of technical change component to TFP growth is positive at 2.94 percent per year, while the technical efficiency change component caused the decrease of total factor productivity at -0.37 percent per year into 2.57 percent per year of TFP change for whole period of time. Moreover, it is revealed that the growth of  total factor productivity of ten out of thirteen provinces of the Mekong Delta are positive in this period.

Investigating the connectedness between countries is one of the most interesting research topics of economists. This paper is designed to determine the level and direction of the connectedness across ASEAN-6 stock markets including Indonesia, Malaysia, Philippines, Singapore, Thailand and Vietnam. The Diebold and Yilmaz (2012) method to calculate the spillover index is applied in combination with the rolling window technique based on data on daily return from 2012 to 2019. Both static and dynamic spillover indices demonstrate a high level of connectedness among ASEAN-6, nearly 27%. However, only 4 out of these 6 countries are well connected, including Indonesia, Malaysia, Thailand and Singapore. Vietnam and Philippines play roles as receivers in ASEAN-6 markets, while Malaysia and Singapore are the countries that play more active roles in the region as senders.

Penta-graphene nanoribbons (PGNRs), an one-dimensional (1D) narrow strip of penta-graphene (PG) hold great potential for applications in sensors. In this paper, the adsorption behaviors of CO, CO2 and NH3 on the edge of the N-doped Sawtooth Penta-Graphene Nanoribbons (N:SSPGNRs) are investigated by calculating the adsorption energy, charge transfer, adsorption distance, electron density difference, density of states, and partial density of states  from first principles method. It was found that the adsorption of CO and CO2 on N:SSPGNR edge shows chemical adsorption, meanwhile the adsorption of NH3 shows physical adsorption. Our results are proposed to predict and understand the CO, CO2 and NH3 adsorpted behaviors on N:SSPGNR edge. This is to guide experimental physicists to apply N:SSPGNRs for gas sensor development.

The family of Yams (Dioscoreaceae) has many species of high nutritional value. Most of which are used as food or medicine (Maynard and O’Hair, 2003; Gupta et al., 2012). Two-year (2016-2017) field trip survey in Bay Nui region (An Giang province), through six places (six habitats - ravines, canyons short-cuts, domestic gardens, residential areas and forests – was surveyed at one place), recorded eight wild species of  Dioscoreaceae. The results showed that seven of eight species are used as medicinal plants, and another species is listed in “Vietnam’s Red Data Book” (2007). Morphological data showed diversity of leaf, stem, and tuberous root. An analysis of leaf anatomy showed that these species are different in terms of size, number, arrangement of epidemis cells of blade edges, and vascular bundles structure of leaf veins and petiole. This difference was also reflected in the xylem structure of leaf veins and petiole, and thickness of schlerenchyma.

In this study, a 3D crystalline metal organic framework based on catecholate linkers was successfully synthesized. The resulting material was obtained by combining titanium isopropoxide (TTIP) and H6THO (where THO6- = triphenylene-2,3,6,7,10,11-hexakis(olate)), known as Ti-76. Its crystallinity was analyzed based on powder X-ray diffraction (PXRD) in combining with the charge-flipping method, by using the program “superflip”. The result showed that the obtaining material is highly crystalline with 3D framework as expected. More specifically, solution was obtained in P21 3 space group with cell parameter a = 17.996 Å. The topology was also determined srs net with double interpenetration.

The study aimed to identify the requirements for hi-tech apply in rice produce in the form of farmers’ field, thereby serving as scientific evidences to build potential regions for hi-tech apply in rice produce development in An Giang province. The study was systematization of the theoretical principles of high-tech apply in agriculture, interview of the expert’s comments and multi-criteria evaluation methods. The study results have identified four general requirements and twenty specific requirements for rice production hi-tech apply in rice produce. In which, specific requirements are paid more attention such as consumption market, profit, investment cost, management ability, production organization method, soil, water resources and environmental requirements. Requests less attention are labor sources and land use rights. This result is the basis for initially building criteria to assess the suitability to identify rice fields applying high technology, towards sustainable agricultural development in the integration period.

Sustainable tourism has been the development trends of tourism industry. Ha Tien city is one of the tourist attractions in Kien Giang. However, the development of tourism brings many positive and nagative impacts on tousit destination. Thus, in order to minimize the negative impacts and take the benefits impacts of sea-island tourism it is essential to develop towards sustainability. Therefore, the main purpose of this study is to explore factors influencing the sustainable tourism development at scenic relics in Ha Tien city, Kien Giang province. The results show that eight factors influencing the sustainable tourism development at tourist destinations, Ha Tien city include:(1) Policies; (2) Safety and security; (3) Environment, road and accommodation; (4) Culture (5)People; (6) Economy; (7) Infrastructure and technical materials; (8)  Entertainment  and parking-lot. Based on outcomes, some solutions are proposed to promote the sustainable tourism development in the study area.

The paper is to study factors affecting international publishing productivity of Can Tho University’s lecturers (researchers not included). The results of regression model based on the data of 158 lecturers show that male lecturers produce more international publications than women counterparts. Academics who studied abroad have more international publications than those studied domestically. In addition, other factors such as professional qualifications, international research preference level, number of research hours per week, and funding for scientific research also have a positive impact on the international publications of academics of Can Tho University.

Professional liability insurance in medical examination and treatment plays an important role for practitioners in compensating for damage happening during their work to a third party. Even so, only a small proportion of the insured is insured because of the following shortcomings. These are inadequate and unsuitable legal regulations, high insurance premiums, and the complexity of career to create the right products. Some suggestions are presented in this content to solve problems.

Student performance prediction is one of the most concerned issues in the field of education and training. The prediction of courses results enables students to select courses appropriately. Moreover, this helps education managers and lecturers to indicate the students who should be monitored and supported to complete the courses with good results. Therefore, the student performance prediction is expected to reduce formal warnings and expulsions from universities due to students’ poor performance. In this study, a method was proposed to predict student performance using deep learning techniques exploring and mining data from universities’ student information system. From collected data, the data was analyzed and pre-processed before fetching them into a multi-layer perceptron to do prediction tasks. The obtained results from the proposed model reveal rather accurate forecasts; hence, the model is expected to apply in practical cases.

This study is to evaluate the effect of the hydrolysis condition of enzyme Pectinex Ultra SP-L on red dragon juice quality and assess the quality of red flesh dragon fruit juice after ferment. Supplement of enzyme Pectinex Ultra SPL preparation facilitated the extraction of dragon juice. The enzyme was used at a level of 0.3% and incubated at 50℃ in 1 hour. The results showed that juice treated with enzyme gave beneficial such as the highest juice recovery yield of 77.03%, the highest betacyanin recovery yield of 82.31%, the highest polyphenol total recovery yield of 41.57% and the transmittance of 86.28%. Gas chromatography analysis results showed that fermented juice had 49 aroma compounds: alcohol (9 compounds) and esters (14 compounds). The sample in this study got the attribute methanol 0.00967 g/L, aldehyde 1.12 mg/L, ethanol content of 9.5%, which meeting the standard of 45:2013 Vietnam standard for wine.

In the new curricula of general education, integrated teaching is an important orientation. In the school year of 2018-2019, researchers piloted integrating reading and essay writing in teaching Class 11A1, Chau Phong High School (located in Tan Chau Town, An Giang Province). In this paper, researchers present the empirical results of integrating reading teaching with essay writing teaching through analysing sample documents and guiding students throughout their reading and writing process using study cards. The analysis of the essays and students’ opinions gained from interviews show that students’ ability in essay writing significantly improved after 20 experimental periods.