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This study was conducted to investigate student barriers to the prospect of online learning in Vietnam, in the context of Covid-19 pandemic. This mixed-method study attracted the participation of 1165 students from twelve universities and nine high schools across thirteen provinces in the Mekong Delta. The findings revealed the additional three obstacles from the qualitative data analysis including (1) geographical features, (2) the economic status of Vietnamese people, and (3) Vietnamese culture and traditions in addition to the six groups of barriers being re-confirmed from Berge's framework (2005). The results of Binary Logistic Regression testified the negative impacts of obstacles in Learner Motivation, Cost and Access to the Internet, and Social Interaction on the prospects of online learning, though it is predicted to go farther in education in Vietnam in the future.

This study was conducted to investigate the impact of gender in learning English online in Vietnam under the impact of COVID-19 pandemic. 1118 students from nine universities and twelve high schools in the Mekong Delta joined in the research. The study indicated gender equality in online education by revealing few discrepancies in the two genders' perceptions about barriers to online learning, excepting for problems about technical skills, cost, and access to the Internet. The results of the mixed-method study which focuses more on quantitative approach also revealed the impacts of perceived barriers on their future online learning readiness through Discriminant Analysis and Chi-square Tests, in which gender had no impact on students' online learning decisions. Qualitative analysis also revealed the influences of economic conditions and regions as additional barriers in addition to the six factors being confirmed from Berge's framework (2005) including (1) Administrative issues, (2) Social interaction, (3) Academic skill, (4) Technical skills, (5) Learners' motivation, and (6) Cost and access to the Internet.

The present study was conducted to select Streptomyces strains that exhibited characteristics of probiotics for application in aquaculture. Streptomyces were isolated from soil and sediment samples collected from various habitats such as riverside, shrimp ponds, pangasius ponds, mangrove forests, or estuaries along the coast of Vietnam. Two strains of Streptomyces (AG12.2 and ND10.1) were selected due to (1) their potent antimicrobial activity against common pathogens that cause serious diseases in shrimp and pangasius such as E. ictaluri, A. hydophila, V. harveyi, V. parahaemolyticus, and (2) their superior ability to produce several extracellular enzymes that strongly hydrolyze organic compounds such as starch, CMC, and skimmed milk, compared to other strains. AG12.2 and ND10.1 can tolerate salinity from 0 ppt to 5 ppt and pH from 3 to 8; however, their growth is most vigorous at salt concentrations and pH between 0 ppt to 2 ppt, and 7.2 to 8, respectively. In vivo evaluation on L. vannamei in this study shows that shrimp that were fed with diets containing AG12.2 and ND10.1 had WG (%) increasing by 1.59 times and 1.61 times respectively, DGW (g/day) increasing by 1.64 times, and FCR decreasing by 1.30 times and 1.35 times respectively. The shrimp treated with AG12.2 and ND10.1 were then challenged with V. parahaemolyticus, resulting in a survival rate increase of 3.9 times and 3.71 times, respectively. Phylogenetic analysis revealed that strains AG12.2 and ND10.1 belong to Streptomyces kunmingensis and Streptomyces angustmyceticus, respectively. The findings of the present study led to the conclusion that Streptomyces kunmingensis AG12.2 and Streptomyces angustmyceticus ND10.1 are excellent candidates for producing beneficial probiotics for aquaculture. [ABSTRACT FROM AUTHOR]