388 research outputs found

    Impact of Time in College on Learner Autonomy: A Comparative Study on English-Major Students with Different Academic Years

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    Learner autonomy (LA) is proven to have a significant impact on English learning and teaching. However, almost no research has examined the impact of students’ time at university on their LA. Therefore, this study focuses on clarifying the impact of students’ time at university on their LA by comparing students’ awareness of LA in different academic years. This research stems from the hypothesis that the more students are at university, the more their LA will increase. Designed as a comparative study, the study used a questionnaire and semistructured interviews to collect data from three groups of English majors studying in different academic years, then compared the hypothesis to check whether or not the students’ awareness of LA is affected by their time in college. The results show that the hypothesis was partly correct because the juniors and seniors had higher LA than the sophomores. However, the juniors even had higher LA than the seniors. In other words, students’ time at university changes their perception of LA. The cause of the difference in LA, besides time at university, was also the difference between high school and higher education, individual differences, or subject matters. Some suggestions profoundly given to help increase LA as well as the quality of teaching are mentioned. The big difference between teaching and learning in high school and university needs to be shortened so that students’ transition from high school to university could be smoother. Also, due to the difference between the two levels of study, first-year students need much more attention to avoid being shocked when they change their learning environment

    A modern purification by accelerated solvent extraction and centrifugal partition chromatography and biological evaluation of capsaicin from Capsicum chinense

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    A special alkaloid compound known as capsaicin, which can only be found in the fruit of the Capsicum plant, was isolated and tested for its anti-inflammatory activity. The purpose of this work is to establish a simple and quick approach for capsaicin purification utilizing centrifugal partition chromatography (CPC) as well as an effective method - accelerated solvent extraction (ASE), for extracting capsaicin from Capsicum chinense. After purification, capsaicin was validated by HPLC-DAD at 281 nm to be > 90% purity. The in vivo anti-inflammatory activity of the isolated capsaicin was also investigated, and the IC50 value of the capsaicin was determined to be 57.61 ”g/mL. The current work emphasizes how an ASE and CPC system may combine to extract high-purity capsaicin from Capsicum chinense, which have the anti-inflammatory activity, as we evaluated in the experiment

    Data of the study entitled "<i>Exploring the Cultural Portrayal of Vietnamese Teachers: An Analytical Study of Professional Identity in Vietnamese Teaching-Themed Songs</i>"

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    Data of the study entitled "Exploring the Cultural Portrayal of Vietnamese Teachers: An Analytical Study of Professional Identity in Vietnamese Teaching-Themed Songs"</p

    A LASSO-based model for financial distress of the Vietnamese listed firms: Does the covid-19 pandemic matter?

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    AbstractFinancial distress is a vexing managerial challenge for businesses worldwide, especially during a turbulent period like the COVID-19 pandemic. Motivated by an increasing number of closed businesses in Vietnam during the recent COVID-19 pandemic, this study is conducted to provide a comprehensive analysis of financial distress for Vietnamese listed firms. Machine learning approaches are employed using the annual data of 492 listed firms from 2012 to 2021. Specifically, we aim to identify the appropriate distress predictors for the Vietnamese listed firms using LASSO, a technique known to be superior compared to other variable selection techniques. Empirical results reveal that there are four key financial distress predictors for the Vietnamese listed firms, namely the ratios of (i) working capital and total assets, (ii) retained earnings and total assets, (iii) earnings before interest and taxes and total assets and (iv) net income and total assets. We also conducted an industry-level analysis and found that the Energy sector experienced the highest number of financially distressed firms during Covid-19. In contrast, Communication Services, Health Care, and Utilities had the lowest number of distressed firms. Policy implications have emerged based on these important findings from our analysis

    Intersecting Traditions and Modernity: Perceptions of Quality Assurance in Outcome-Based Education among Vietnamese University Lecturers

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    In the continuously evolving landscape of global education, the role of Quality Assurance (QA) in fortifying and maintaining the relevance of teaching and learning processes has grown ever more critical. In this context, Vietnam—a country delicately balancing its rich traditions with a strong push towards modern educational paradigms—offers a unique vantage point. The primary aim of this study was to delve deep into Vietnamese university lecturers’ perceptions regarding the intersection of QA and Outcome-Based Education (OBE), particularly focusing on its ramifications on their academic practices. Adopting a qualitative methodology, we engaged with ten lecturers from two distinct universities in the Mekong Delta. Through semi-structured interviews, participants shared their narratives, which were subsequently analyzed using a thematic analysis approach. This analysis was enriched and contextualized through the lens of established theoretical frameworks. The emergent themes painted a multifaceted picture. While recognizing the transformative potential that QA can bring within the OBE framework, lecturers often found themselves grappling with the challenges of seamlessly integrating traditional teaching methodologies with the demands of OBE. Adding to this complexity were concerns about the potential erosion of the ‘human touch’ in teaching as technological interventions become more pervasive in QA processes. Another intriguing dimension was the interplay of deeply rooted Vietnamese cultural norms with contemporary QA practices, serving at times as barriers while at others as catalysts for innovation. The revelations from this study underscore the imperative for establishing culturally resonant QA systems, crafting comprehensive and contextual training modules, and ensuring a judicious blend of technology and traditional pedagogical practices. While resonating with universal themes in education, the findings also spotlight the nuances specific to Vietnam’s academic landscape, making a case for contextually tailored educational interventions

    Microplastic accumulation in oysters: Insights from aquaculture and laboratory conditions

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    International audienceMicroplastics, emerging pollutants, are present in seafood and pose a potential health risk to consumers. The objective of this study was to assess microplastic concentrations in the surface water, sediments, and oysters of the Cha Va River, an aquaculture production area in southern Vietnam. Laboratory experiments were also conducted to examine rates of ingestion by and bioconcentration of microplastics in oysters. Microparticles including microplastics were measured in all samples collected from the field, and presented 9-27 items m − 3 in surface water, 3300-8000 items kg − 1 dry weight in sediments, and 0.67-8.33 items ind − 1 or 0.02-0.33 items g − 1 wet weight in oysters. Fibre shapes and blue colour were the most common while polypropylene, polyester, polyethylene, and polyethylene terephthalate acrylate, alkyd were identified. The presence of microparticles in surface water and sediment was influenced by the complex vertical motion characteristic of tidal environments whereas the microparticles in natural oysters seemed to be closer related to those in sediment than in the surface water. Laboratory experiments showed that oysters incubated in 10 and 1000 microplastics L − 1 tanks accumulated 4.1 ± 2.0 and 19.0 ± 11.0 microplastics per individual, respectively. However, bioconcentration of microplastics in oysters was higher (12.37 ± 6.95) in tanks with lower microplastic concentrations than in tanks with higher microplastic concentrations (0.62 ± 0.35). It is a high potential human health risk to the local oysterconsumers because of the annually microparticle ingestion from 657 to 3942 items per person. We suggested further studies on the severity of this potential health risk and policies for minimising microplastic emissions into the environment in Vietnam

    Seroepidemiology and Carriage of Diphtheria in Epidemic-Prone Area and Implications for Vaccination Policy, Vietnam

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    In 2019, a community-based, cross-sectional carriage survey and a seroprevalence survey of 1,216 persons 1–55 years of age were conducted in rural Vietnam to investigate the mechanism of diphtheria outbreaks. Seroprevalence was further compared with that of an urban area that had no cases reported for the past decade. Carriage prevalence was 1.4%. The highest prevalence, 4.5%, was observed for children 1–5 years of age. Twenty-seven asymptomatic Coerynebacterium diphtheriae carriers were identified; 9 carriers had tox gene–bearing strains, and 3 had nontoxigenic tox gene–bearing strains. Child malnutrition was associated with low levels of diphtheria toxoid IgG, which might have subsequently increased child carriage prevalence. Different immunity patterns in the 2 populations suggested that the low immunity among children caused by low vaccination coverage increased transmission, resulting in symptomatic infections at school-going age, when vaccine-induced immunity waned most. A school-entry booster dose and improved infant vaccination coverage are recommended to control transmissions

    Hexavalent Chromium Inhibited Zebrafish Embryo Development by Altering Apoptosis- and Antioxidant-Related Genes

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    This study aimed to assess the effects of hexavalent chromium on zebrafish (Danio rerio) embryo development. The zebrafish embryos were treated with solutions containing chromium at different concentrations (0.1, 1, 3.125, 6.25, 12.5, 50, and 100 ”g/mL). The development of zebrafish embryos was estimated by the determination of survival rate, heart rate, and the measurement of larvae body length. Real time RT-PCR and Western blot were performed to assess the expression of apoptosis- and antioxidant-related genes. The results showed that the reduced survival rate of zebrafish embryos and larvae was associated with an increase in chromium concentration. The exposure of higher concentrations resulted in a decrease in body length of zebrafish larvae. In addition, a marked increase in heart rate was observed in the zebrafish larvae under chromium treatment, especially at high concentrations. The real-time RT-PCR analysis showed that the transcript expressions for cell-cycle-related genes (cdk4 and cdk6) and antioxidant-related genes (sod1 and sod2) were downregulated in the zebrafish embryos treated with chromium. Western blot analysis revealed the upregulation of Caspase 3 and Bax, while a downregulation was observed in Bcl2. These results indicated that hexavalent chromium induced changes in zebrafish embryo development by altering apoptosis- and antioxidant-related genes