Postprandial hyperglycemia is an early effect of type 2 diabetes and one of primary anti-diabetic targets. Treatment of postprandial hyperglycemia can be achieved by inhibiting intestinal α-amylase and α-glucosidase, the key enzyme for starch digestion and further glucose absorption. This study evaluated the anti-diabetic potential of guava leaf by determining their anti-postprandial hyperglycemic activities in vivo and in vitro. Ethanolic extract of the leaves of Psidium guajava was orally tested at doses of 400 mg/kg body weight for evaluating the hypoglycemic effect in nomal and alloxan monohydrate induced diabetic mice. The results proved that diabetic mice treated with this plant extracts showed significant (P

Rambutans fruits cv. “nhãn” (Nephelium lappaceumL.) are grown mostly in Cho Lach, Ben Tre. Fruits were packed in PE, PP, EPS, PVC bags, cartons and stored at temperatues ranging from 10 to 30°C. The quality criteria (skin color, weight loss, soluble solids content, citric acid and ascorbic acid contents) and sensory value were analysed. Maximum shelf life for rambutan was attained at 10oC in PE and PP bag, retarded colour loss and expended shelf-life by 10-11 days (in comparison to 30oC) and limited weight loss (0.5 to 0.6%) while these maintained only 4 days at 30°C with relatively high weight loss (21.9%). The soluble solids content, sugar and acid almost did not change during storage, while ascorbic acid content tended to decline slightly. Using of PE (or PP) bag showed advantages for low temperature rambutan storage. In addition, odd ratios (sensory analysis by logistic regression) were highly correlated to temperature and time of storage.

Our investigation aims to propose random trees to classify gene data which have very small amount of samples in very high dimensions and noise. The random forest algorithm proposed by Breiman is usually suited for classifying very-high-dimensional datasets. However, the classical majority rule of a decision tree degrades the classification accuracy of random forests. We have proposed to improve the classification performance of random forests by using in each leaf of the tree a local class labeling rule instead of the majority rule. The numerical test results on gene datasets from datam.i2r.a-star.edu.sg/datasets/krbd/ showed that that our proposal gives good classification results compared with classical random forests and support vector machine (SVM) in terms of Precision, Recall, F1 and Accuracy.

Collected folk tales of the Nguyen Lord in the South is Nguyen Anh?s stories associated with the journey "national escape to the South" in the fight against the Tay Son. In particular, the group of ?divine things, strange signs? is one of the typical story groups giving a stunning impression and having a deep meaning for the story system. Surveys of materials, structural features and contents, story meaning of the group of ?divine things, strange signs? lead to a foundation for the generalization of characteristics of the story system.

The research aims to identify factors effecting provide and use the suporting services and proposing solutions to develop its services for agricultural enterprises in Can Tho city. The research used secondary and primary data collected from 163 enterprises, including 112 enterprises in the field of business assistance and 51 agricultural enterprises by stratified sampling method. The methods applied in the study are descriptive statistics and factor analysis. The results showed that the factors effecting provide and use the suporting services are high service price, low service quality, limitted types of services and small scale of capital of enterprises. From the suggested problems, the research proposes the solutions to help develop supporting services such as developing demand and supply of supporting services for the  enterprises, providing capital support and improving competitiveness for the enterprises.

Gac, pumpkin, and lucuma are popularly planted in Vietnamand have high content of b?carotene in their fruits. Our results showed that Soxhlet system with diethyl ether solvent was the best method for gac oil extraction in comparison to the maceration with other organic solvents. The spectrophotometer was approved a reliable equipment for quantifying b-carotene from plant materials. b-Carotene content in gac oil was much higher than those in pumpkins and lucuma. Boiling temperature not only had strong effect on b-carotene degradation in gac oil, pumpkins, and lucuma, about 50% of b-carotene was disappeared after boiling the pumpkin fruit tissue for 5 minutes, but also lowered the total soluble protein in pumpkin fruit tissue about 14 times after boiling with the same mentioned duration.

Aspergillus protuberus exposing chitinolytic activity was isolated from Can Gio Mangrove Forest. Conditions affecting the production of chitinases by Aspergillus protuberus were optimised under solid substrate fermentation (SSF). The most suitable conditions for chitinase production by A. protuberus were 106 spore/g culture medium containing 15% chitin,  0-2% Na. with pH 5.5 and moisture of 80%, the incubation time was 48 hours  at 300C. Aspergillus protuberus yielded maximum chitinase 1,252U/g fresh biomass. Chitinase preparation from mould fresh biomass in distilled water showed optimum activity at temperature 550C and pH 5.0.

CanthoUniversityLibrary System including main library (LearningResourceCenter) and 13 branch libraries in the schools and institutes was established in 1997.  Branch libraries are located within the schools and are reported to the school management, while LRC is in charge of collection development. Every year the branch libraries receive a significant budget to develop their information resource and facilities but have not attracted students to the library.  Project ?Research on the improvement of performance and the service models for  the branch libraries withinCanthoUniversitylibrary system? was conducted to evaluate the services of the school library systems and the resources of branch libraries.  The study used survey methods with quantitative analysis techniques to find results for research questions ( 677 surveys were collected and analyzed).  Research results indicate the current status of resources and services of the libraries.  This is the basic for designing an appropriate operational model for the library system to improve the operational capabilities of the library service.

This study aims at identifying the factors affecting the level of student satisfaction with the quality of tourism training among universities in the Mekong Delta. Data from the study were collected from 294 final-year students in the tourism sector among various universities in the Mekong Delta. Research methods include descriptive statistics, Cronbach's Alpha test, exploratory factor analysis (EFA) and linear regression analysis. Research results showed that fundamental factors affecting the level of student satisfaction with the quality of tourism training consist of "practice conditions", "social knowledge", "degree of teachers' interactions" and " foreign language skills". Among them, " degree of teachers' interactions " is the factor that has the most influence on student satisfaction level with the quality of the tourism training among the universities in the Mekong Delta.

Hydrocotyle bonariensis and Hydrocotyle vulgaris, two new species in the Mekong- delta, were first analysed of the chemical composition. From the material collected in Tien Giang and Can Tho, three sterols, sterol glycosides, dibenzylbutyrolactone lignans and flavonol glycosides were isolated and identified. These compounds had some differences in the stereochemical structures. Hydrocotyle bonariensis has not been studied in the world and Hydrocotyle vulgaris has not been studied in Vietnam. The structures of these compounds were elucidated based on the data of spectrocopic techniques 1D, 2D-NMR and MS. The research has been continued.

Optimal selection of strains, fermentation conditions and substrates, which are very important for the successful production of cellulase by bacteria, were investigated in this study. A total of 37 anaerobic bacteria was screened on modified Delafield medium, in which Whatman filter paper powder was used as substrate. The results showed that the isolate VK52 adopted the highest cellulase productivity, illustrated by the largest haloes in diameter (20.5 mm) on Congo red-containing medium. The optimal conditions for cellulase production by VK52 were determined as 300C, pH 8 and 4-day-incubation on the medium supplemented with 0.4 % yeast extract. Paper and cellulose powder were the most favorable subtrates for cellulase production by the isolate VK52 in comparision with rice straw, sugarcane bagasse and rice husk.

In the literature, romance and reality are two concepts which are often said to have contradictory meanings and associated with each other in antagonistic relations. However, the practice of literature shows that there is interference, mutual penetration between these literary issues with many different levels. This means that the boundary between romantic literature and reality literature is not immutable. However, recognizing this boundary still causes controversy in some controversies, literary criticism. Therefore, the recognition of blurred boundary between romantic literature and reality literature is necessary to survey both past literary and contemporary literature.

The survey results from 13 members of a Long Tuyen agricultural cooperative and 35 farmers outside the cooperative showed that this cooperative contributes significantly to improve technical knowledge for the cooperative members? and surrounded community and plays an important role in promoting a farming contract between its farmers and entrepreneur. However the results also illustrated there is correlation unspecific in improvement of the household?s income and joining cooperative. The results also indicated that their cooperative from initial period bring the high economic efficiency for the members and itseft, but later on the cooperative activities? are likely perfunctory and uneffective.

Analogy is an important reasoning in learning and scientific research. In teaching mathematics, analogy is used not only to construct meaning for knowledge but also build hypothesis to discover learning content. To use analogy better, teachers need to analyze clearly the features of the source and target, then map their shared attributes. In this article, we introduce an analogy teaching model to help teachers to practise the above analysis: FAR model (the Focus-Action-Reflection).

In this study, some characteristics of free Candida rugosa and Porcine pancreas lipase were studied by the biocatalyst performance in aqueous (hydrolysis) media. Firstly, two enzyme lipases were compared in term of molecular weight (MW) and boundary conditions such as pH, temperature, level reaction, pH and thermal stability, the influence of metal ion and active energy (Ea) following the olive oil hydrolysis. The new optimum values of the two enzymes were then established. The results showed that the activity of the biocatalysis of lipase from Candida rugosa was better than that from Porcine pancreas. New optimum values of Candida rugosa enzyme found were: MW of lipase from Candida rugosa was about 60 kilodalton, the phosphate buffer pH was of 7.0, the temperature was of 40°C. Under these conditions, the batch was repeated in order to determine the pH stability after 60 minutes. The results showed that enzyme activity was still of 79.6% (1023.8 U/mg protein.min), half-life time (t1/2) was found to be 210 (min), deactivation constant (kd) was 3.3ì10-3 (min-1), after 60 minutes thermal stability of enzyme activity was still of 84% (940.48 U/mg protein.min) and Ea was found to be 15.176 (kJ/mol). Similarly, the results from Porcine pancreas enzyme were: MW of lipase from Porcine pancreas was about 50 kilodalton, the borate buffer pH was of 8.5, the temperature was of 40°C. The batch under these conditions was repeated in order to determine the pH stability after 30 minutes. The results showed that enzyme activity was still of 100% (5,88 U/mg protein.min), t1/2 was found to be 148 (min), kd is 4.7ì10-3 (min-1), after 60 minutes thermal stability of enzyme activity was still of 71.4% (4,2 U/mg protein.min) and Ea was found to be 72.156 (kJ/mol). From the results of this study, it was concluded that the two enzymes were influenced by Ca2+, Mg2+, and Al3+; and  the hydrolysis reaction was found to be at level one.

Tang poetry from its birth to present day has always been a special concern of scholars. That is probably dued to the variety in content and the artistic value of the poetry in general. In the evaluation process of arts in Tang poetry, it can be said that nearly no issue has not been mentioned, but the cultural codes of Tang poetry is relatively lack the necessary attention (some research and books have referred to the issue, but there is probably no works on its own). In this article, we focus mainly on analyzing some typical cultural codes of Tang poetry often appear, indicate systematic sense of them, as well as ralate those codes with Vietnamese medieval poetry to eventually give preliminary look about the cultural codes of Tang poetry in its own system.

A study on efficiency of recombinant Bacillus subtilis expressed chicken interferon alpha (B. subtilis-ChIFNa) in prevention of Newcastle disease for chickens was carried out in 3 week old chickens of Tamhoang breed by oral supply of 0.5x1010 spores of B. subtilis-ChIFNa per chicken and comparing the efficiency of standard ChIFNa with dose of 104UI/chicken. The experimented results showed that after challenging by virulent Newcastle disease virus with dose of 104 ELD50 per experimented chicken, the survive rate of chickens in B. subtilis-ChIFNa treatment was (79.17%) higher than that of chickens in standard ChIFNa treatment (45.83%) and than that of control (12.50%). Our results suggestted that B. subtilis-ChIFNa could be potentially useful in the prevention of Newcastle disease in chickens.

Application of Pseudomonas stutzeri and Acinetobacter lwoffii to remove ammonia in wastewater of biowaste was carried out to evaluate their ability of ammonia removal at different concentrations with and without aerobic condition in laboratory condition. The results showed that these species had ammonia removal ability effectively at both 50 mg/l and 100 mg/l ammonia. Pseudomonas stutzeri strain D3b and Acinetobacter lwoffii strain TN7 are the best bacterial species to remove ammonia. Besides that, both of species removed ammonia in aerobic condition better than anaerobic condition. In three days, the ammonia removal efficiency of Pseudomonas stutzeri D3b were 97.2% and 98.57% and Acinetobacter lwoffii TN7 were 96.32% and 98.31% in 50 mg/l and 100 mg/l ammonia concentrations in wastewater of biowaste, respectively.

Today, mathematical objects, which are instroduced into curriculums and textbooks, apart from its derivative and developed periods in history. So to teach mathematics effectively, teachers need to take into account the historical elements. Thanks to research didactical transposition of mathematical knowledge from history to textbooks, they will have raised more pedagogical valuable ideas. This paper presents the results of research on the didactical transposition of  fractional numbers in primary schools.

Being rich in natural resources, Can Tho city is also well-equipped with the most modern infrastructure and technology. In addition to its economic, cultural and financial central position in the Mekong Delta. Can Tho city has full conditions for tourist development. Nevertheless, Can Tho is currently not exploiting those full tourist potentials, and tourist services do not completely meet both domestic and international tourists? satifaction. This study was carried out to evaluate the current tourist industry?s business activities in Can Tho city, to analyze both objective and subjective factors that contributed to tourist quality. This study also aimed to determine tourist development tendency for Can Tho city based on which some measure for tourist service improvement in the city in the coming years were suggested. In order to determine which factors had the most contribution to tourists? satifaction, this study used factor analysis method and confirmed that there were five groups such as service provision ability, infrastructure, typical locality, safety, and labor sources being all influence tourists? satisfaction.   

From the ethyl acetate extracts of the aerial parts of Eupatorium odoratum L. from Phu Yen province, one flavone (5,7-dihydroxy-3?,4?-dimethoxyflavone) was isolated. Its structure was interpreted based on spectra including 1H-NMR, 13C-NMR, HMBC and on published data. This flavone was tested for antioxidant activity by DPPH method. The result showed that its antioxidant activity was weak.

Sixteen varieties of common cultivated mushroom in Mekong delta were investigated to observe their genetic diversity. Firstly, fruiting body samples of mushroom were collected. Then all of them were isolated in CHANG medium to get pure cultures of mycelium. DNA from mushroom hyphae was extracted by procedure adapted from Gardes and Bruns (1993). After that, ITS regions were amplified by PCR method with specific primers ITS1 and ITS4. Finally, the ITS sequences of sixteen mushroom varieties were analyzed and phylogenetic tree was created to express genetic relation among studied varieties. The result showed that mushroom varieties had diversity. The dendrogram indicated that mushroom varieties were closely related with high levels of bootstrap support. Genetic tree of studied varieties had two branches, each one had five varieties. The first one includes varieties belong to Volvariella volvaceae and it was divided into two groups. The other branch which includes varieties of oyster mushrooms was also divided into two groups belongs to Pleurotus cystidiosus, Pleurotus floridanus strains, and Pleurotus pulmonarius. Both two golden needle mushroom samples were Flammulina velutipes. And the medicinal mushroom samples were belong to three strains including Ganoderma lucidum, Ganoderma gibbosum và Ganoderma tropicum.

The application of the ?Set of National Standards of New Rural? depends on local socio-economic conditions and approaches. This study aims to examine the responsive levels of a village to the 19 criteria of the Set of National Standards of New rural (SNSNR). The study was conducted at Vinh Vien village, a pilot new ruralvillageofHau Giangprovince. Results of the study showed that only 6/19 criteria of the SNSNR were achieved. The criteria achievements were rural market, the forms of production organization, education, health, cultural, and socio-order and security. Four criteria of new rural model are being in process to fulfill as of electricity, post, school and environment. There were four criteria to be considered as of great challenges to local authority and inhabitant in executing to fulfill requirements of SNSNR are housing conditions, incomes, poor household ratio and labor-structure. Lessons learnt in executing of new rural are localities should be based on their reality conditions and advantages to select one or two strategic criteria to impulse the process to be faster and more effective. Enhancement of the participation and empowerment local people are considered as the key for the successful in executing the new rural.

Survey data from 115 enterprises in Can Tho city have been analyzed using descriptive statistics, cross-table analysis with more squared test. The researchers have visualized the process of building and developing brand names of businesses in the city. Through the herringbone pattern, research has suggested four solution groups to develop brand names for businesses in the city. Can Tho namely: (1) Raising awareness of enterprises about the brand, (2) Strengthening human resources in building business brand names, (3) Improving the legal system, policies and action programs for the brand names, (4) Strengthening the assisting role of building brand names from different associations.

Study on the chemical ingredients from the bark of Lagerstroemia speciosa, growing in  Can Tho University, we have isolated and identified three compounds: stigmasterol (1), betulinic acid (2) and oleana-9(11),12-dien-3-ol (3) from the petroleum ether extract. The structures of these compounds have been elucidated by modern spectroscopic methods: ESI-MS, NMR-1D and 2D. The study has been continued.

In the field of audio compression, it has been known to the popular compression standards such as MPEG, MP3, JPEG... A common feature of the compression algorithms are: high compression performance and best sound quality after decompression. However, due to the complexity of the algorithms so that compression and decompression process must always be separated into two distinguished processes makes these algorithms that can not be used in the case of online data compression and decompression. This paper proposed an algorithm for compression and decompression of the voice signal based on the zero-crossing points.

The current study investigates the extent of strategies used in multiple-choice tests by 131 EFL students of Nguyen Binh Khiem High School for the Gifted, Vinh Long city, Vietnam. The sample means of all of the three strategies ? cognitive, metacognitive, and compensation (M = 3.61, SD = .51; M = 3.64, SD = .54; M = 4.11, SD = .46, respectively) were shown. On the basis of the findings, the researchers made some pedagogical implications for teaching and learning English in Vietnamese high school context.

The objective of this paper is to measure satisfied level of enterprises in the Mekong Delta about human resource quality which were trained by the universities. Conclusions from the findings are made more valuable with comparisons of the training quality between the required quality of the enterprises and the observed quality trained by the universities. The descriptive statistics and independent sample t-test have been applied to cross-sectional data obtained for the enterprises in the year 2011. The empirical results indicate that the training quality required are high through the assessed factors. Regarding the human resource quality trained by the universities, the enterprises seem to be satisfied. However, there are few surveyed factors to be somewhat not satisfied from the enterprises such as the ability of students in self-working, in team-working and negotiation ability as well.

The binding of growth hormone (GH) molecule to its two consecutive GH receptors (GHR) will activate GHR, thus resulting in the activation of a series of relative pathways including JAK2/STAT5. This activation will induce pleiotropic actions on cellular development, metabolism and growth. BA/F3 cell lines were transduced with retroviral supernatant containing mutated GHRs on the linker containing the EED motif. Mutations were engineered by inserting 1 or 2 ? helices (4 or 7 Alanines) after EED motif or by substitution of EED (-) by KKR (+) or AAA (nonpolar). There are 10 ways of organizing to produce transfected cell lines: (Wt-Wt), (Wt-KKR), (Wt-AAA), (KKR-KKR), (AAA-AAA), (Wt-7A), (Wt-4A), (4A-7A), (7A-7A), (4A-4A). Relative positive controls with the addition of GH were also set up. Transfected cells were harvested and observed the phosphorylation of STAT5 via Western blot method. Cell proliferation assay was also conducted. The results showed that there was an increase in the phosphorylation of STAT5 and cell proliferation at the cells transfected with (Wt-KKR) and (Wt-AAA) in comparison with other samples. This proved that any change in the polar attraction between 2 linkers of the dimeric complex would reorient the conformation of the transmembrane/cytoplasmic domain towards the realignment of JAK2 thus resulting in the activation of JAK2 or STAT5 that controlling cellular growth and maturation.

Pod number and pod shape are two important factors influencing final yield in soybean.  Pod number of eighty genotypes was recorded, and pod shape was evaluated quantitatively by using elliptic Fourier descriptors. Eighty soybean cultivars from different regions were sown from January to April 2010, Hung Thanh ward, Cai Rang district, Can Tho city. The experiment was carried out in Random Complete Block Design with three replications. Each cultivar was sown on two rows, each row with five metre length. The distance for rows and plants was 40 x 10cm, with 2 plants per hill. Five all were randomly selected for measuring agronomic traits. Twelve pods per cultivar were used to analyzed pod shape. 80 elliptic Fourier coefficients for each kind of pod were calculated for each contour. Results showed that Vietnamese cultivar group had highest pod number (about 34 pods) as compared with the other groups, but Chinese cultivar group gave more three-seeded pods than others. The cumulative contribution at the fifth principal component was more than 95% for one-seeded pods, and more than 85% and 82% for two-seeded and three-seed pods, respectively.

The research aimed to construct a scale of motivational employees in offices in Can Tho city, this study had used analytical methods Cronbach?s Alpha, factor analysis to test and determine the scale. Then, this was regression analysis to find the factors affecting the motivating workers. The results showed that the scale of motivational employees consist of the rules and policies; working relationships; work; welfare.

An Giang is one of nine provinces of Mekong Delta affected by monsoon flood annually and is an upstream province bordering withCambodia. Yearly, upstream flood water discharges to downstream along with rain water when they cause flood. When flood comes, it causes a lot of difficulties and damages for agricultural production, especially Summer-Autumn rice crop and third rice crop. In addition, flood also results in many serious damages in term of infrastructure and people, particularly children. Although flood is an annually natural and unavoidable phenomenon but results from study showed that coping and adaptation capacity of households in research sites is limited and livelihood strategies are easily vulnerable to flood ? they depend much and are determined by natural conditions, especially in the context of unexpected climate change, occurring frequency of big floods are considerably high and unforeseen. So, many projects have been conducted and these contents turn normally around two main solutions: structure (infrastructure construction) and non-structure (coping capacity and capacity building) measures. According to research results also, comprehensive and community based approaches are highly evaluated in the process of adaptation with flood and resilience after flood.

Training by credit-based system is a progressive modality of training in the world. The essence of this modality training is enhancing activeness and self-motivated of students. This study presents the nature of training by credit-based system, advantages and disadvantages of this system, contemporary situation and solution to raise self-motivated of students. The research data was collected from 500 students in regular majors of Cantho University. In addition, we refer some opinions and research data of specialists and lectures in some other universities. The result showed that the imperative problem of training by credit-based system was how to raise self-motivated of students. This is one of the important solutions to increase quality of training by credit-based system.

A structured questionnaire-interview based survey on the impacts of natural disasters and climate change on households level was carried out in 4 areas of Binh Thuy and Vinh Thanh districts, Can Tho city. There were 200 households which are randomly chosen in the survey areas for two districts. The survey results showed that collected information was realistic and relevant to local people?s expectations. Local people in rural areas suffered more impacts of climate change than those who lived in suburban areas or nearby markets. Children, the elderly, disable people and the poor were the most vulnerable groups. The disaster preparedness of local people was not good enough; information, training courses organized by local authorities were so limited; there were few civil organization of pollution, natural disasters and climate change; local people?s behavior or awareness were not changed. Through the discussion, some recommendations for reducing the vulnerability and upgrading the adaptation capacity are given.