Tạp chí Khoa học Trường Đại học Quốc tế Hồng Bàng
Tạp chí của Trường đại học Quốc tế Hồng Bàng
A-IPLA: A symmetric, non-monotonic activation function for convolutional neural network
Trong bài viết này, một hàm kích hoạt đối xứng tâm, không bão hòa và không đơn điệu mới gọi là hàm kích hoạt tuyến tính nghịch đảo thích ứng (A-IPLA) được đề xuất để tránh vấn đề sai lệch ở đầu ra của các nơ-ron, cải thiện được hiệu quả nhận dạng và tốc độ hội tụ của mạng nơ-ron. Hàm này sử dụng phương pháp kích hoạt phân đoạn, đồng thời tùy theo sự thay đổi của điểm phân đoạn và hệ số góc, từng phân đoạn sử dụng các hành vi kích hoạt khác nhau bao gồm kích hoạt tuyến tính và kích hoạt nghịch đảo. Đầu tiên, hàm A-IPLA có ưu điểm về đối xứng tâm giúp tránh được giá trị trung bình đầu ra khác 0, do đó giải quyết được vấn đề dịch chuyển đầu ra. Thứ hai, hệ số góc của A-IPLA có thể tự động cập nhật thông qua quá trình huấn luyện giúp cải thiện tính linh hoạt của hàm kích hoạt. Các thử nghiệm sử dụng mô hình Lenet-5 được thực hiện trên các bộ dữ liệu chuẩn khác nhau (MNIST, CIFAR-10) cho thấy rằng hàm kích hoạt được đề xuất hoạt động tốt hơn các hàm kích hoạt hiện hành trong tất cả các thử nghiệm với mức cải thiện độ nhận dạng chính xác là 0.20% trên MNIST, 5.34% trên CIFAR-10. Đồng thời, trong điều kiện độ nhận dạng chính xác như nhau, tốc độ hội tụ của hàm được đề xuất nhanh hơn 3.55 lần trên MNIST và nhanh hơn 2.69 lần trên CIFAR-10.
The cooperation between competition law enforcement authorities and public procurement authorities in the fight against bid rigging: The case of Vietnam
The cooperation between competition law enforcement authorities and public procurement authorities has been widely recognized as an effective tool in detecting and preventing bid-rigging in the public procurement market. By employing empirical research in the form of in-depth interviews, this paper seeks to examine such cooperation in the Vietnamese context. The findings reveal that neither the Vietnamese public procurement agencies nor the Vietnamese competition authorities have successfully fulfilled their cooperative roles in fighting against bid-rigging. These findings provide valuable lessons for both Vietnamese and international policy-makers by emphasizing the need to examine the relationship between competition authorities and public procurement agencies towards effective anti-bid rigging enforcement.
A new technique of two iliac cortical bone blocks sandwich technique for secondary alveolar bone grafting in cleft lip and palate patients
Objectives: To describe in detail treatment procedure and outcomes of a new technique of two iliac cortical bone blocks sandwich for alveolar cleft in patients with unilateral cleft palate. Materials and methods: Based on previous techniques, our clinical experience with 32 cleft sites had confirmed the alveolar cleft bone graft outcomes and implant success with new technique of two iliac cortical bone blocks sandwich. Patient selection criteria was patients over 15 years old, patients in good health for endotracheal anesthesia, patients already had palatoplasty, patients with complete unilateral alveolar cleft, lack of permanent tooth germ in the cleft and did not receive any alveolar cleft bone graft. The patients underwent general dental treatment and pre-surgical orthodontic treatment. Any tooth extraction was performed 2 months before bone graft if necessary. All patients underwent late secondary bone grafting for alveolar cleft. This paragraph focused on introducing new technique and clinical results with follow-up time of 96 months after alveolar bone grafting. Results: After 4 to 6 months, 100% of cases showed good mucosal healing. After 4 to 6 months' follow-up, the bone formation score I was 90.6% in 29 patients and score III was 9.4% in 3 patients. After 90 months, all 18 implants were recorded success in 15 patients remained follow-up. Conclusion: A new treatment method was suggested for patients with cleft lip and palate defect, not only to recover the function but also to meet the esthetic demand helping patients communicate confidently for community integration.
Applying deep learning to forecast the demand of a Vietnamese FMCG company
In the realm of Fast-Moving Consumer Goods (FMCG) companies, the precision of demand forecasting is essential. The FMCG sector operates in a highly uncertain environment marked by rapid market shifts and changing consumer preferences. To address these challenges, the application of deep learning techniques, particularly Long Short-Term Memory (LSTM) networks, has emerged as a vital solution for enhancing forecast accuracy. This research paper focuses on the critical role of demand forecasting in FMCG, emphasizing the need for LSTM-based deep learning models to deal with demand uncertainty and improve predictive outcomes. Through this exploration, we aim to illuminate the link between demand forecasting and advanced deep learning, enabling FMCG companies to thrive in a highly dynamic business landscape.
Research impact of digital culture on digital transformation in Vietnam businesses
Objective: Digital transformation is a process that has an impact on all sectors of society, especially on the economy, economy and businesses. Digital transformation opens up new and limitless possibilities for business operations. However, an organization that wants to accelerate digital transformation needs to first focus on its people-or its culture. Digital transformation is not only about technology, but the key issue is transforming the values, beliefs and goals of the business first. Businesses are one of the organizations that are experiencing the rapid and powerful impact of digital transformation in many fields. Method: this study focuses on understanding the influence of digital cultural factors on the digital transformation process in Vietnamese enterprises, using the framework of 7 digital cultural factors (feasibility, openness, knowledge, reliability, agility, interdependence and accountability) by Cigref research. The study has collected 305 survey questionnaires by means of an online Google form survey and sent to business members operating in Vietnam at random. Conclusion: The survey data is processed by SPSS 16 software to find out the influence of each factor through the standardized regression model of the research variables.
Opportunities and challenges for Vietnam's social order in the digital economy
The acceleration of information technology has oriented the development of a digital society where a new social order was formed based on data relationships. The research used a systematic literature review and qualitative research methods to explore the characteristics of new social order in an AI-enabled world. The research aims to identify the formation of new social order and its impacts on the socio-economic development in Vietnam. The results contributed to theories of transcendental phenomenology, social construction, and urbanism. The results identified intertwined opportunities and challenges for Vietnamese digital society, including social identity management, smart urban infrastructure management, and data colonialism. Recommendations suggested a transformative strategy based on a collaboration between government, education, and business to develop human capital concerning digital citizenship, culture reinforcement, and social support.
Evaluation of in silico anticancer activity of some striazine derivatives as VEGFR2 inhibitors
The s-triazine derivatives have been shown to have diverse biological activities, especially anticancer activity. Fifty s-triazine derivatives were screened for anticancer activity through inhibition of VEGFR2 (vascular endothelial growth factor receptor-2) by molecular docking method using AutoDock Vina software. Compounds 20 and 40 showed the strongest interactions among all tested compounds with the binding affinity values of -10.8 and -10.5 Kcal/mol, respectively compared to reference drugs Gedatolisib (-9.1 Kcal/mol) and Paclitaxel (-7.8 Kcal/mol) at the active site of VEGFR2. These compounds established one carbon-hydrogen bond at amino acid HIS1026, specifically exhibiting better electrostatic and hydrophobic interactions than the reference drugs Gedatolisib and Paclitaxel. Moreover, compounds 20 and 40 also showed interactions with the VEGFR2 receptor that resemble the reference drug Gedatolisib at amino acids such as ARG1027, ASP1046, and HIS1026. Therefore, these compounds could be a potential lead molecule for anticancer activity.
Responsible tourism - Pathway to realizing sustainable development: Introduction to responsible tourism and its implementation in the ASEAN
The concept of sustainable tourism first emerged in 1992. After more than 30 years on a journey towards establishing sustainable values, we have shown signs of perplexity in various aspects, focusing on issues such as: whose responsibility it is, how it should be implemented, and how it can be measured. Although each country has demonstrated efforts to minimize the impact of tourism on life across three dimensions: economic, environmental, and social. It must be acknowledged that these relentless efforts reflect a high sense of responsibility from governments and organizations. However, it seems the process of protecting the environment and human life is weaker than the rate of tourism development. We need to clarify more about who is responsible and how in this global campaign. Responsible tourism emerged in 2002 and became stronger after the COVID-19 pandemic as a global revolution for the tourism industry. Utilizing qualitative research methods: data collection and processing, case study, observation, and interviewing, this article (the first part) delves into the core aspects of responsible tourism as a strategic direction for achieving sustainability in the tourism sector. Furthermore, the paper summarizes the application of Responsible Tourism in some Southeast Asian countries in recent times.
Factors influencing Vietnam's rice export to Europe
Vietnam is known as one of the biggest rice exporters in the world but its export value is not high and increases slowly. Rice importing partners of Vietnam are many world's biggest trading partners, such as America, Japan, China, Europe,…Especially, Europe is a great potential import market but Vietnam has not been able to exploit it effectively. Therefore, this paper examines the factors affecting the rice export activities of Vietnam into the European market. The series panel data of bilateral trade from 2000 to 2019 and the gravity model are used to estimate the export activities of rice. The results have revealed that the gross domestic product of Vietnam, the exchange rate of European countries (in VND/USD), institute quality of Vietnam positively affect the flow of rice trade; while per capita income of European countries, exchange rate of Vietnam (in USD/VND) and the geographical distance between Vietnam and importers impact negatively.
Evaluation of functional activity components in the occupational therapy program for patients with stroke
Occupational Therapy (OT) with the aim of improving Functional Activities (FAs) for patients. In theory framwork, the FAs should be the main component and take up most of OT intervention. This research's goal is to assess the ratio of the composition of FAs to different therapeutic modalities on stroke's patient by observing 31 OT sessions of 12 therapists with a lisence of 3 years experience or more on 31 stroke patients (14 acute stage, 17 recovery stage) in Japan. The result showed that the duration time for one session was with an average of 45.5 ± 11.3 minutes; of which 30% of session was used for FAs. Activities relating to cooking (8.5%) and functional mobility (7.8%) were the most frequently used activities. Three forth of the treatment time is spent on activities in the sitting and standing positions, and the remaining time is spent on activities in the lying position. At the acute stage, there is a link between the level of patients independence (FIM) and the use of FAs in the tre program (P<0.05). However, at the recovery stage, the level of independence of the patients increased significantly but did not change the composition of the FAs. This study illustrated that the therapists seem to have focused more on activities with the aim of improving body structure and function defects according to the ICF classification.
Creating mutant Murine Cytomegalovirus using signature tag mutagenesis
Cytomegalovirus (CMV) belongs to the Beta subclass of Herpes virus family. Human Cytomegalovirus (HCMV) was found to be ubiquitous in human populations. While remaining asymptomatic or only causing mild subclinical consequences in healthy populations, HCMV causes debilitating symptoms in individuals whose immune system is compromised such as blindness, pneumonia in AIDS patients, mental or behavioral dysfunction in neonates, and allograft rejections. To make matters worse, the virus will establish a life-long latent and persistent infection. Currently, there are no effective vaccine or treatment methods for the virus clinically. In addition, HCMV research is challenging because Beta Herpes virus infections are highly species-specific. To overcome this barrier presented by HCMV, researchers make use of Mouse Cytomegalovirus (MCMV) because MCMV shares a high degree of genetic similarity and disease manifestation with HCMV. In this study, Bacterial Artificial Chromosome techniques developed in the Liu Fenyong Lab - UC Berkeley is coupled with signature tag mutagenesis to generate deletion mutants for each of the 170 genes in pSM3fr - our MCMV BAC construct. Using our novel design, we successful generate tagged mutants and demonstrate that we can distinguish each separate tagged virus from one another.
South Korean unmarried single women's images in the 2000s through major South Korean newspapers
South Korean women's images mostly connect with the ideal women's images of “good wives, wise mothers”. However, the number of single women in South Korea population has been increasing significantly in recent years. Various media outlets such as television and newspapers have been mentioning and discussing the lifestyles and mindsets of Korean single women, often using hot keywords such as "Gold Miss", "unmarried single women (Bihon)", and "single women (Mihon)" in both positive and negative contexts. This study aims to explore the most popular and representative characteristics of South Korean single women and figure out the transition of single women's images in the 2000s since the Asian financial crisis in South Korea. Based on literature reviews and newspaper reference sources, this research also aims to find out what people think about the most popular images of South Korean single women nowadays, then summarizes the similarities and differences in the popular images of South Korean unmarried single women described by Korean newspapers's discourse and existing literature reviews.
Applications of readability findings in teaching languages
Readability or text readability, particularly in English, has been studied since the end of the 19th century with hundreds of thousands of published works. The research results on this issue are not only quite rich in resources but also universally applicable in many fields. Currently, it is an interesting problem and still being continuously studied by researchers, not only for English but also for many other languages. However, in Vietnam, the study of readability is still limited research to find the solutions to meet the social needs. Based on the findings and applicable results of readability studies, the paper, initially, presents an overview about readability and the linguistic factors having influence on readability. On the view from readability and applications, the paper investigates and analyses the linguistic factors on 3 main levels: Words, Sentences, and Texts by the illustrative case studies in English language, or Vietnamese language. On this basis, the paper suggests the practical applications of readability in teaching languages ​​in general, particularly in the context of teaching English in Vietnam currently, to meet the demand for users and Vietnamese community in the era of technology.
Translanguaging in English teaching in higher education
Recently, whether to use translanguaging in teaching English has received great attention from language researchers and language teachers all over the world. This critical review aims to systematically synthesize literature on the use of translanguaging in teaching English in higher education. Research results show that translanguaging has added a new dimension to the long-standing debate on the use of mother tongue (L1) in foreign language teaching/learning because it basically emphasizes viewing language as a unitary system in contrast to the traditional perception that each language belongs to a separate system. The revolution in the perceptions of the importance of using L1 in foreign language teaching/ learning is justified because translanguaging promotes a more effective teaching and learning process. However, students' native language must be used strategically in the classroom with the aim of facilitating and supporting the teaching process and enabling learners to develop comprehension, communication skills and acquisition of the target language.
Risks at commercial banks and some recommendations for Vietnamese commercial banks
The recent consecutive banking crises in the world have raised concerns about a global financial crisis like what happened more than a decade ago. Facing the risk of possible crises due to political and social instability globally, what should Vietnam prepare to avoid a crisis in the banking system or to be ready to respond if a crisis occurs? This article research banking crises, analyzes risks in banking system and proposes recommendations to avoid banking crises.
Green human resource management in the era of digitalization: Hospitality sector
In the precipice of the digital age, organizations are navigating through a transformation that is not only technological but also ecological. In light of the increasing emphasis on sustainability within the business sector, Green Human Resource Management (Green HRM) has surfaced as a crucial approach that incorporates environmental stewardship into fundamental human resource operations. The convergence of digitalization and Green HRM signifies an unprecedented paradigm shift, presenting a chance to reconceptualize the function of human resources in promoting environmentally conscious business strategies. This study investigates the incorporation of Green HRM into the digital age in the hospitality sector with 252 respondents including staffs and managers, examining how digital platforms and tools can facilitate the implementation of environmentally sustainable human resource practices.
Quality improvement at Eastern People Military Hospital
Quality improvement is a permanent goal of all types of organizations. The change in hospital quality management towards patient satisfaction is an inevitable and objective trend. Objective: Compare the importance level with the implementation level of each criterion according to the IPA matrix to arrange the order of improvement at Eastern People Military Hospital based on the Vietnam Hospital Quality Criteria Set (Version 2.0). Methods: The research design is quantitative with a general analysis method to achieve the goals. Results: Determine the position of each criterion on the IPA matrix and identify improvement directions for the criteria applied at the Eastern People Military Hospital. Conclusion: The article emphasizes the importance of the IPA matrix when evaluating quality at hospitals and suggests directions for improving service quality according to world practices.
Comparison of immunomodulatory proprieties and antioxidant effect between chicken protein, casein and gluten consumption in mice
This study was designed to evaluate the immunomodulatory proprieties and antioxidant effect of chicken protein by comparing with gluten and casein consumption. 18 Six-week-old female Balb/c mice were randomly separated into 3 groups. Without acclimation, mice were fed ad libitum for 8 weeks with AIN-93G (without protein) supplemented with casein or gluten or chicken protein (20% of the total amount) for casein, gluten and meat group respectively. Flow cytometric analysis was used to measure the cell surface expression of CD11b as macrophage marker, and CD11c+ cells in the spleen. In addition, for distinguishing the phenotype of macrophage, ELISA was performed to measure the interferon-ɣ and interleukin-10 in the supernatant of splenocytes cultured with 10μg/mL of concanavalin A. Oxidative stress was evaluated by measuring the total reactive oxygen species generation in liver. For this purpose, the probe, 2', 7'- dichloro-dihydrofluorescein-diacetate was used, and the result was expressed as fluorescence intensity per mg of protein in the liver homogenate. Regarding the results, splenocytes isolated from mice for each group contained high rate of macrophage, 5.71±0.41%, 5.95±0.47% and 5.24±0.63% for casein, gluten and meat group respectively. Yet, the level of interferon-ɣ and interleukin-10 in the supernatant of splenocytes cultured with concanavalin A for 96h showed no significant differences. In addition, the variation intra-group was a bit high. In fact, interferon -ɣ production was ranged from 30.57 to 162.95 pg/mL, 0 to 122.95 pg/mL and 16.29 to 188.67pg/mL for casein, gluten and meat group respectively. Interleukin-10 production was varied from 7.75 to 185.25pg/mL, 0 to 75.25pg/mL and 0 to 272.75pg/mL for casein, gluten and meat group respectively. Concerning reactive oxygen species generation, no significant difference was also found. However, the trend showed that meat group produced less reactive oxygen species than the 2 other dietary groups. In fact, it was ranged from 0.49±0.03 to 0.96±0.06, 0.68±0.16 to 1.12±0.22 and 0.49±0.08 to 0.74±0.11 fluorescence intensity/mg of protein for casein, gluten and meat group respectively after 40 and 80min of incubation of liver homoginate with DCFDA. Taken together, despite the high rate of macrophage, it was difficult to draw any conclusion about the dominant phenotype in each group. Concerning the antioxidant effect, the trend showed that meat group produces less reactive oxygen species than the other 2 dietary groups.
Motives influencing the co-production behavior of Vietnamese tourists: Scale development and validation
The study highlights a number of incentives that impact product co-production behavior, including: economic, psychological, and social motivations. It was developed from the research framework "Descriptive model of the consumer co-production process" by M. Etgar. Nevertheless, particularly for travel-related goods, defined measurement scales for these variables are still lacking. A credible and dependable scale measuring the social, psychological, and economic factors influencing co-production behavior through a conceptual approach is needed to close this study gap. Multidimensional ideas become essential and significant. From an operational standpoint, tourist managers can assess or track the success of co-production techniques using measuring scales as a reference. The main purpose of this research is to develop a measurement scale for the group of psychological motives, economic motives and social motives that influence tourists' co-production behavior. With this goal, the techniques implemented for measuring these concepts will follow the guidelines (Churchill, 1979) of including the following steps: 1) Identify topics and create categories; 2) Screening and correction; and 3) Validate the scale.
Application of simulated annealing in logistics vehicle allocation system: A case study from Vietnamese FMCG company
Fast-moving consumer goods (FMCG) are products that sell quickly with a reasonable price. The FMCG business segment is characterized by efficient distribution systems to manage a vast array of products with varying shelf lives and consumer demand patterns. For any FMCG and consumer durables company, optimizing the market converge may be a very profitable and productive activity. Sales managers of FMCG products can enhance their overall sales by allocating their field resources such as deliver staff to reach the greatest number of customers. Through the process of analysing related documents and object characteristics in FMCG companies, paper aim to build vehicle routing with time window (CVRTW) model to optimize the delivering process, thus satisfying customer demand. To ensure the quality of the results, the model will be solved using the simulated annealing algorithm (SA-algorithm). The overall results support the decision maker the delivery allocation strategy, ensuring the delivery time and client contentment.
A survey on the consumer knowledge of organic cosmetics at Can Tho City in 2022-2023
Background: The organic cosmetics market in Vietnam has been developing for a long time. However, to have a more objective view of the organic cosmetics market, a comprehensive understanding of the market for organic cosmetics is necessary to provide development directions that are genuinely correct, unfortunely there isn't much research to support it. Therefore, studying the knowledge of organic cosmetic consumers will aid in the advancement of both intellectual and economic domains. Objectives: The purpose of study is to assess knowledge about organic cosmetics of consumers in Can Tho City. Materials and methods: The present study used a cross-sectional descriptive method, based on using a cross-sectional descriptive design, interviewing 559 organic cosmetics consumers in Can Tho City using a set of interview questions to assess consumers' knowledge of organic cosmetics. Results: The majority of consumers aged 18 to 25 (72.1%) are interested in and use organic cosmetic products more than other ages. Women consumers was found with higher proportion (70.7%) than men consumer (29.3%). Most consumers have average or higher knowledge with a proportion of (61.4%). The study also found that medical staff have better knowledge about organic cosmetics than other groups. Conclusions: The results of the study have shown that the majority of people have good knowledge, but there are many who are not. However, whether or not this knowledge status is connected to the intention to purchase organic cosmetics requires further research.
Molecular docking study of anticancer activity of some s-triazine derivatives as HDAC6 inhibitors
A novel series of s-triazine derivatives was designed and screened for in silico anticancer activity in histone deacetylase 6 (HDAC6) target by molecular docking method using AutoDock Vina. Compound 12 showed the strongest interactions among all tested compounds with the affinity value of -11.3 Kcal/mol compared to the reference drugs Gedatolisib (-8.9 Kcal/mol) and Paclitaxel (-9.0 Kcal/mol) at the active site of HDAC6. In particular, compound 12 established strong hydrogen bonds and showed hydrophobic interactions that resemble Gedatolisib and Paclitaxel at amino acids such as SER150, LYS142, TRP261, and ALA145. Therefore, this compound could be a potential lead molecule and support for experimental testing against an HDAC6 enzyme as an anticancer agent.
Factors affecting the solvency of agricultural cooperatives in Vinh Long province
This study has identified the factorsfactors affecting the solvency of agricultural cooperatives in Vinh Long province, Vietnam. This study conducted surveys of 626 farmers and filtered out 297 farmers who are currently in debt to credit institutions and whose payments are not due or have been paid within 12 months. Multivariable linear regression method was used to determine factors affecting solvency of agricultural cooperatives in Vinh Long province. Based on the data, binary logistic was used for research. SPSS ver26 was used to measure the factors including age, educational level, size of farm, farm income, natural disasters - epidemics, interest rate to the solvency of agricultural cooperatives. The result of the study indicates that educational level, size of farm, farm income significantly affected the solvency of agricultural cooperatives. The results show five factors affecting the solvency of agricultural cooperatives in Vinh Long province, Vietnam, including three positive factors, two negative factors of the six initially factors of the research model. This result provides the basis for lenders to have a realistic view of their loan repayment effectiveness, and to adopt appropriate policies and practices to mitigate risk during operation. On the other hand, it can also help local, state, and local macro managers to adopt appropriate policies, implement poverty alleviation programs and ensure social security.
Tooth supported overdenture: Case report
Objective: Preserving the natural tooth root in prosthetic treatment improves the support, retention and stability of the restoration. The concept of tooth supported overdenture with attachments is based on a reduction in the root/crown ratio and a combination of retention on a custom attachment to improve retention for the denture. The aim of this case report is to present the clinical steps to perform tooth supported overdenture with cast attachment in patients with large maxillary torus. Methods: A 60-year-old female patient came to the clinic because her old denture cannot be used due to loose abutment teeth. The patient has a large maxillary torus extending to the vibration line. The final treatment plan is to extract the hopeless loose teeth and use the remain maxillary roots to serve as abutment teeth for the new removable partial denture. The sequence of treatment after periodontal and endodontic treatments is preparation of post space, taking impression and cast post with attached male part. The steps of fabricating removable dentures are performed simultanously with the post fabrication to save time for the patient. Female part of the attachment (Kugel hook) is mounted on the male part of the post and clinical pick up of attachment dental is performed chairside using to the self curing dental acrylic. Conclusion: The incorporation of attachment into the tooth supported overdenture improves the support, retention and stability of the restoration and slows down the bone resorption process. This is one of the goals of preventive prosthodontics.
Development and validation of HPLC method for determination of β-ecdysone from Callisia fragrans (Lindl.) woodson
The HPLC method for the determination of β-ecdysone from Callisia fragrans was developed and validated. Thereby, crushed herbal powder of stem and leafs of Callisia fragrans (Lindl.) Woodson was extracted with MeOH by sonification. The MeOH extract was evaporated at low pressure to obtain the residue of total extract. This MeOH fraction was carried out liquid - liquid extracting method with solvents of increasing polarity: n-hexane, EtOAc. The fraction EtOAc containing β-ecdysone was performed by using the HPLC method. The simple chromatographic separation condition was carried out on a C18 column using isocratic mobile phase consisting of 60% (v/v) methanol and 40% (v/v) water with flow rate of 1.0 mL/min. The eluted process was monitored by a diode-array detector at wavelength of 242 nm. Results obtained in validation demonstrated an linear relationship between the corresponding peak areas and the concentration of β-ecdysone: y = 164896x - 42687, as confirmed by the correlation coefficient of 0,998. The concentration of β-ecdysone in Callisia fragrans (Lindl.) Woodson was determined by using the HPLC with 0.052% of dry powder.
Metaphoric meanings of words denoting animals in English and Vietnamese
Animals are considered very important and significant to human life. Human tends to express different emotions and behaviors with the help of animals. However, people who speak English, and people who speak Vietnamese have different ideas for the same animals. This research deals with the metaphoric meanings denoting animals in English and Vietnamese. It aimed to find out the similarities and differences between the two languages. The research data were collected from many dictionaries and books of languages, idioms, proverbs, and metaphors. They were then described and analyzed on the metaphoric meanings under qualitative and quantitative approaches.
Reading comprehension difficulties among EFL learners: The case of English-majored students at Bac Lieu University
No one denies the important role of reading comprehension in the reading learning process of a language learner. It is assumed that the learners who are unable to read and comprehend face many challenges during their studies and after graduation. This study aims to investigate what common difficulties may influence on reading comprehension and suggest some appropriate solutions to help learners overcome these difficulties. The subjects were 90 first-year students majoring in English Language Studies at Bac Lieu University. The results demonstrated that all of the participants showed the positive attitude towards reading skill, but all of them still had some difficulties in the field of vocabulary, prior knowledge, prediction skill, and decoding at word level in learning reading. The paper also discussed the results, suggested some solutions to get over these kinds of difficulties and recommended some ideas for further research in the field.
Chemical constituents and pharmacological effects from different parts of grape Vitis vinifera L. (Vitaceae): A review
Vitis vinifera fruit (grape) possesses phenolic compounds, flavonoids, and stilbenes. Active substances have recently been found in the whole fruit, flesh, seed, skin, pomace, leaf and tendril, and root of grapes. This article reviews the active constituents of different parts of V. vinifera and their pharmacological effects, including antioxidant, anticancer, anti-inflammatory, antidiabetic, hepatoprotective, cardioprotective, and neuroprotective properties. Intriguingly, the cultivars and extraction technology play a pivotal role in determining individual extracts' biological activity.
Strategies for controlling viral diseases of orchids in Vietnam
Orchids are one of the most important flowering plants in Vietnamese urban agriculture. During the last decade, the orchid cultivation area has expanded significantly and this has led to the increase of the growers' income. The orchid - virus diseases are causing serious damage to orchid production and quality while the treatment hasn't yet been shown. Conventional approaches to control virus spread are time - consuming and costly, however ineffective. In order to control this disease more effectively, it is necessary to establish efficient strategies employing advanced techniques of plant biotechnology. In this report, we present the outputs of our current strategy for managing the viral disease in orchids, including virus detection using the RT - PCR, virus - free orchid micropropagation, meristerm culture for the recovery of virus - infected plants, and development of virus - resistant orchids using RNA interference (RNAi) technology. In addition, the feasibility, effectiveness and prospects of the control strategies for orchid viruses in Vietnam are also discussed.
Khảo sát đặc điểm thực vật và mã vạch ADN của cây Sachi (Plukenetia volubilis L.) - họ Euphorbiaceae
Đặt vấn đề: Cây Sachi (Plukenetia volubilis L.) có nguồn gốc từ rừng rậm Amazon, phổ biến nhất là ở Peru, cây có giá trị dinh dưỡng cao. Tuy nhiên, chưa có nhiều nghiên cứu về cấu trúc vi học, bột dược liệu và dữ liệu về mã vạch ADN của loài cây này. Mục tiêu: Khảo sát đặc điểm thực vật và mã vạch ADN của cây Sachi Plukenetia volubilis L.. Đối tượng và phương pháp: Mẫu cây Sachi thu tại vườn dược liệu Trường Đại học Công nghệ Miền Đông tháng 5/2024 được phân tích, mô tả các đặc điểm hình thái và giải phẫu đồng thời phân tích ADN vùng ITS. Kết quả: Định danh được mẫu cây Sachi trong nghiên cứu là loài Plukenetia volubilis L. thuộc họ Euphorbiaceae dựa vào đặc điểm hình thái, cấu tạo giải phẫu và kết quả phân tích mã vạch ADN; kết quả soi bột dược liệu mẫu cây Sachi có các cấu tử: Mảnh mô mềm, mạch xoắn, mạch vạch, tinh thể canxi oxalat hình cầu gai, khí khổng, lông che chở. Kết luận: Nghiên cứu góp phần định danh chính xác loài Sachi Plukenetia volubilis L. và cung cấp dữ liệu phục vụ cho việc nhận dạng, kiểm nghiệm trong các nghiên cứu tiếp theo.