Published: 2020-11-30

The dietary supplement efficiency of essential oil of chive (Allium macrostemon) on the productivity and health performance of broilers

Phan Vu Hai, Pham Hoang Son Hung , Ho Thi Dung, Tran Ngoc Liem, Nguyen Dinh Thuy Khuong, Nguyen Xuan Hoa
Abstract | PDF
This experiment was conducted to study on the effect of chive essential oil (Allium macrostemon) (CEO) on the production and health of broilers. One-day old roosters (Ross 308) were allocated to 4 treatments with 3 replications (10 birds/replication). The experiment consisted of control group (CT) with a basal diet and T1, T2 and T3 groups with the supplement in the basal diet by levels of CEO at 100, 300 and 500 mg/kg respectively. In general, boilers supplemented with CEO had the better FCR compared to the CT.  However, broilers in T2 group (300 mg/kg) showed the highest efficiency in terms of weight gain, FCR and PEI. In addition, the use of CEO in T2 and T3 group tended to reduce the incidence of respiratory and diarrhea syndrome in broilers by more than 50% of cases. It can be concluded that the supplement of CEO at the level of 300 mg/kg in the diet had improved the productive and health performance and may be a viable alternative to growth promoter in broiler production.

Facile synthesis of bimetallic ZnCo-ZIFs and Ag nanoparticles loading on ZnCo-ZIFs (Ag/ZnCo-ZIFs)

Dang Huynh Giao, Ho Ngoc Tri Tan, Doan Van Hong Thien, Pham Van Toan, Le Thi Anh Thu, Ta Kieu Anh
Abstract | PDF
A bimetallic Zn/Co zeolitic imidazole frameworks (ZnCo-ZIFs) was successfully synthesized from 2-methylimidazole and two metal salts including zinc nitrate, cobalt (II) nitrate by a solvothermal method at the room temperature. Subsequently, Ag nanoparticles (AgNPs) loading on bimetallic frameworks was prepared by a facile impregnation method in acetone solvent. Both ZnCo-ZIFs and Ag/ZnCo-ZIFs was analyzed by several characterization techniques including X-ray powder diffraction (PXRD), scanning electron microscope (SEM), Fourier transform infrared spetroscopy (FT-IR), thermogravimetric analysis (TGA) and energy-dispersive X-ray spectroscopy (EDX). The results showed that ZnCo-ZIFs crystals had sodalite structure, high thermal stability and AgNPs was successfully loaded on the ZnCo-ZIFs with content of 18.42%. Ag/ZnCo-ZIFs in this combination may pave a way for the preparation a kind of heterogeneous catalyst to remove organic compounds from aqueous solutions.

Adsorption of chromium (VI) ion using adsorbent derived from lignin extracted coir pith

Luong Huynh Vu Thanh, Cao Luu Ngoc Hanh, Tran Nguyen Phuong Lan, Tran Thi Bich Quyen, Ha Quoc Nam
Abstract | PDF
In this study, coconut coir pith (cellulose-lignin compound) was first treated with water and sodium hydroxide solution to remove lignin and impurities, then lignin-extracted coir pith was calcined at 200°C for 6 h. The obtained absorbent  was applied to remove Cr(IV) ions by using adsorption method. Some analytical methods such as thermal gravimetric analysis (TGA), Fourier Transform Infrared Spectroscopy (FT-IR), Brunauer–Emmett–Teller analysis (BET), X-ray powder diffraction analysis (XRD), pHpzc analysis, Boehm titration and potentiometric titration were employed to characterize structure, specific surface area, functional groups and surface charge of the absorbent. Adsorption results showed that 95.23% of Cr(IV) was removed from solution of 100 mg.L-1 by using certain amount of absorbent at pH 2.0 within 20 min at room temperature. Kinetics of Cr(VI) adsorption from aqueous solution on absorbent fit to Pseudo-second-order kinetic equation and adsorption isotherm of Cr(IV) followed to Freundlich model.

Teachers’ motivation and its influence on quality education: A study at a center for foreign languages in Vietnam

Luu Nguyen Quoc Hung
Abstract | PDF
Teacher is one of the most important elements in education. The quality of education is largely determined by the teacher’s quality. Few would argue against the view that motivated staff are a central resource for the success and quality of an organization, and thus attention needs to be given to examining teachers’ motivation as a key to guaranteed quality education. At the Center of Foreign Languages, Can Tho University, teachers are always recognized as key factors for the success of the institution. This small-scale study was conducted with 42 teachers of English of the Center for Foreign Languages with the aim to examine common factors affecting teachers’ motivation and their perceptions towards quality education. The results of the survey revealed the most common factors for teachers’ motivation and the findings from focus group discussions indicated the positive relationship of teachers’ level of motivation with quality education.

Effects of using E-learning system on learning outcomes of students in Can Tho University

Ngo My Tran, Thach Keo Sa Rate, Nguyen Ngoc Thao
Abstract | PDF
This study is conducted to assess the impact of using E-learning on students’ learning outcomes through combining models of technology acceptance model (TAM) and an information system success model (D&M model) basing on surveyed data from 294 students using E-learning system in Can Tho university. The main method used to evaluate this impact is structural equation model analysis method (SEM). The empirical results showed that perceived learning outcome is statistically influenced by three factors including learning assistance, community building assistance and perceived motivation. Of which, the community building assistance factor was found to play a strong role of students’ perceived learning outcome. Therefore, building solutions to develop of perceived motivation and community building assistance of the system in order to improve E-learning usage in Can Tho university should be paid attention in the coming time.

EFL lecturers’ needs for professional development: A case study of an institution in the Mekong Delta

Le Xuan Mai
Abstract | PDF
Professional development is considered as an essential element in improving teachers’ competencies which, in turn, enhance students’ learning outcomes. In order to provide useful input for the design of more effective and productive professional training programs, this small-scale study was conducted to investigate EFL lecturers’ strengths and weaknesses, and their needs for professional development. Seventeen lecturers were recruited for this descriptive study; they provided information via questionnaire and four of them participated in semi-structured interviews. The English Teacher Competency Framework was mainly used to explore the lecturers’ strengths and weaknesses on five domains, namely knowledge of subject, knowledge of teaching, knowledge of learners, professional attitudes and values, and practice and context of language teaching. The semi-structured interview was employed to get more information about their needs for professional development. Almost all EFL lecturer participants in this study reported a high level of confidence on all domains. The common PD activities that the lecturers need more training or sharing refer to their teaching (e.g. teaching language skills, techniques for classroom management and groupwork management, designing lesson plans for mixed ability class) and their own learning (e.g. reading professional materials and resources, participating activities related to professional community, observing colleagues’ teaching, and attending seminars, workshops or conferences). The findings from this study raise the lecturers’ awareness of their own strengths, weaknesses and needs as well as inform training program developers and administrators in designing appropriate professional training programs and suggest related research areas in the future.

Impacts of a one-shot training program for in-service teachers on the application of Task-based Language Teaching

Nguyen Anh Thi, Phuong Hoang Yen
Abstract | PDF
Tieng Anh:Task-based language teaching (TBLT) has been recently implemented as a potential language teaching method for language education in Vietnam. However, research into the training for teachers on the application of TBLT has remained scarce. This study, therefore, aims to examine how Vietnamese in-service teachers implement the insights from a one-shot training program on TBLT in their classroom-based teaching practices. Three in-service teachers at a university in Vietnam participated. Data were collected through a video-taped classroom observation activity. Findings indicate that the teachers on the whole were unable to transfer the theoretical knowledge of TBLT principles that they had built up during the training program into their actual teaching practices. In addition, the teachers failed to perform TBLT teaching roles throughout the lesson. Accordingly, this study suggests pedagogical implications and insights with regard to the issue of teacher training on TBLT in the context of language education in Vietnam.Tieng Viet:Phuong phap giang day co ten la "Task-based language teaching" (TBLT) duoc thuc thi gan day tai Viet Nam va duoc danh gia la mot phuong phap giang day ngon ngu rat tiem nang. Tuy nhien, den nay van khong co nhieu nghien cuu tim hieu ve hoat dong dao tao, tap huan giao vien de co the ung dung TBLT vao hoat dong giang day tren lop. Vi the, nghien cuu nay tap trung vao viec tim hieu muc do hieu qua cua hoat dong tap huan, cu the la hinh thuc tap huan ngan han (one-shot training) cho giao vien ve phuong phap TBLT, lieu giao vien co the ung dung duoc TBLT vao dieu kien giang day thuc te tren lop sau khoa tap huan hay khong. Ba giao vien giang day mon tieng Anh tai mot truong dai hoc o Viet Nam dong y tham gia vao nghien cuu. So lieu duoc thu thap thong qua hoat dong quay video ve hoat dong giang day cua giao vien tren lop. Ket qua nghien cuu cho thay nhin chung giao vien khong co kha nang thuc thi kien thuc TBLT (nguyen tac cot loi, vai tro giao vien) ma ho da duoc tap huan vao hoat dong giang day thuc te tren lop hoc cua minh. Tu ket qua do, nhom nghien cuu de xuat phuong huong, giai phap va ke hoach hanh dong cho hoat dong tap huan giao vien trong viec ung dung, thuc thi TBLT trong dieu kien giang day ngoai ngu tai Viet Nam.

Effect of sodium chloride and temperature on biofilm formation and virulence of Flavobacterium columnare isolated from striped catfish (Pangasianodon hypophthalmus)

Nguyen Thi Kim My, Tu Thanh Dung, Channarong Rodkhum, Dong Thanh Ha
Abstract | PDF
This research was conducted to investigate the biofilm formation ability at various salt concentrations and temperatures of Flavobacterium columnare isolated from striped catfish (Pangasianodon hypophthalmus) at Can Tho University. Microtiter plate assay and the in vivo challenge were used to test the virulence of this strain of F. columnare for 10 days by immersion method at different salt concentrations (0, 3, 6, 9, 12 and 15 ppt). Results showed that biofilm formation of F.columnare was inhibited at 3 and 6 ppt and stronger reductions were recorded at 9, 12 and 15 ppt. In the same trend, the higher temperature the lower biofilm formation, the highest biofilm formation was at 25°C treatment, then it was reduced at 28 and 31°C and at 35°C the formed biofilm was greatly reduced. Interestingly, there were no statistically significant differences between 28 and 31°C (P>0.05). The virulent study found that 100% fish died after 1 day post challenge at 0 ppt. There were 10% and 25% of fish died at 3 and 6 ppt respectively. No dead fish was found at 9 and 12 ppt. In conclusion, biofilm formation was inhibited at 3 ppt, was almost controlled at 9, 12 and 15 ppt and was also mostly reduced at 31°C at least in the in-vitro study. Furthermore, the virulence of this bacterial strain was controlled 90% at 3 ppt and completely controlled (100%) at 9, 12 and 15 ppt.

Medical malpractice liability insurance: Comparision of Vietnam to some European countries

Nguyen Thi Bao Anh
Abstract | PDF
Medical malpractice liability insurance (MMLI) is one type of professional liability insurance that protects healthcare professionals from liability associated with wrongful practices. This type of MMLI can cover a result of bodily injury, medical expenses, and property damage, as well as the cost of defending lawsuits related to such claims. The frameworks of MMLI of the countries such as explanations, insurable interest, insured risk, insured premium, indemnification, and the third party will be analysed and compared.  Comparing the systems of MMLI in Vietnam with other countries-Belgium, France, and England- is to be aware of the different and similar regulations. The results from this study may help Vietnam to study more through the models of MMLI of Belgium, France, and England.

In vitro anti-inflammatory resorcinol derivatives and their in silico analysis

Rahen Mahmuda, Tran Quang De, Negar Sultana Shoshi, Khadija Akhter Poly, Pranoy Saha, Sukumar Bepary, Shahenul Islam, Shamima Akhter
Abstract | PDF
Resorcinol with its two hydroxyl groups was derivatized in laboratory to observe the anti-inflammatory potential in vitro. Subsequently in silico docking analysis was done for observing the binding modes in cyclooxygenase enzyme to have idea about the subsequent possible developments. At the doses of 200 mg/ml and 400 mg/ml. the compounds showed the anti-inflammatory property, where 02 offered dose dependent 51% and 70% of inhibition of heat induced hemolysis respectively. The scaffold thus poses as an interesting pharmacophore suitable for lead generation for the inflammatory disorders.

Pyrazole substituted resorcinol derivatives with PI3K inhibitory potential

Sukumar Bepary, Tran Quang De, Ge Hyeong Lee
Abstract | PDF
Phosphoinositide 3-kinase gamma enzymes play significant roles in inflammatory cell recruitment to tumors and accordingly lot of studies have targeted development of small molecule inhibitors against these enzymes for managing various chronic inflammatory disorders. In this study, a number of Pyrazole substituted Resorcinol derivatives have been synthesized in the laboratory and then were evaluated for the inhibitory potential against the gamma isozyme. Highest inhibitory potential was observed from the introduction of non-polar phenyl or methylbenzyl substitution (66.4% and 59.5%) on the OH group of the resorcinol. Addition of relatively polar moiety resulted in decrease in the inhibitory potential and lowest inhibition was observed from 4-pyridyl methyl and 2-morpholino ethyl moieties (23.6% and 24.5% inhibition respectively). The results were encouraging due to remarkable inhibition showed by these compounds against the PI3K enzyme. Thus the scaffold appears as interesting pharmacophore suitable for further development.