Background: This research’s aims are to determine the prevalence of anxiety among students at Hanoi Medical University in the academic year 2020-2021 and some related factors. Methods: This study used a descriptive cross-sectional study on 1325 students at Hanoi Medical University, using DASS-21 scale with questionnaire of anxiety subscale and a self-designed questionnaire. Students were chosen to the study conveniently during the period of data collection. Results: The result of this study showed that the prevalence of anxiety among students was 42.3%. In this population, the moderate subgroup accounted for the biggest prevalence, at 19.1%. The figures for other subgroups, including mild, severe and extremely severe, were 8%, 6.6% and 8.6% respectively. Relevant factors to students’ anxiety were financial difficulties, online learning difficulties and a factor related to Covid 19, which was “afraid of coming home due to the chance of infecting family members with the disease”. Conclusion: Nearly half of students were likely to have anxiety disorders, requiring support measures. Students needed to practice physical exercises, manage schedules to improve their health. Besides, universities should provide financial and academic support to struggling students.

Thailand is one of the largest citrus producers in Southeast Asia. Pathogenic infection by Phytophthora, however, has become one of major impediments to production. This study identified a pathogenic oomycete isolated from rotted roots of pomelo (Citrus maxima) in Thailand as Phytophthora nicotianae by the internal transcribed spacer ribosomal DNA sequence analysis. Then, we examined the in vitro and in vivo effects of Chaetomium globosum, Chaetomium lucknowense, Chaetomium cupreum and their crude extracts as biological control agents in controlling this P. nicotianae strain. Represent as antagonists in biculture test, the tested Chaetomium species inhibited mycelial growth by 50~56% and parasitized the hyphae, resulting in degradation of P. nicotianae mycelia after 30 days. The crude extracts of these Chaetomium species exhibited antifungal activities against mycelial growth of P. nicotianae, with effective doses of 2.6~101.4 microg/mL. Under greenhouse conditions, application of spores and methanol extracts of these Chaetomium species to pomelo seedlings inoculated with P. nicotianae reduced root rot by 66~71% and increased plant weight by 72~85% compared to that in the control. The method of application of antagonistic spores to control the disease was simple and economical, and it may thus be applicable for large-scale, highly effective biological control of this pathogen.
Asia, Southeastern ; Biological Control Agents* ; Chaetomium* ; Citrus* ; Complex Mixtures ; DNA, Ribosomal ; Hyphae ; Methanol ; Oomycetes ; Phytophthora* ; Plants ; Seedlings ; Sequence Analysis ; Spores ; Thailand ; Tobacco*

Phytophthora diseases have become a major impediment in the citrus production in Thailand. In this study, an isolate of Phytophthora denominated as PHY02 was proven to be causal pathogen of root rot of Pomelo (Citrus maxima) in Thailand. The isolate PHY02 was morphologically characterized and identified as Phytophthora palmivora based on molecular analysis of an internal transcribed spacer rDNA sequence. This work also presents in vitro evaluations of the capacities of Chaetomium spp. to control the P. palmivora PHY02. As antagonists, Chaetomium globosum CG05, Chaetomium cupreum CC3003, Chaetomium lucknowense CL01 inhibited 50~61% mycelial growth, degraded mycelia and reduced 92~99% sporangial production of P. palmivora PHY02 in bi-culture test after 30 days. Fungal metabolites from Chaetomium spp. were tested against PHY02. Results showed that, methanol extract of C. globosum CG05 expressed strongest inhibitory effects on mycelial growth and sporangium formation of P. palmivora PHY02 with effective dose ED50 values of 26.5 microg/mL and 2.3 microg/mL, respectively. It is interesting that C. lucknowense is reported for the first time as an effective antagonist against a species of Phytophthora.
Chaetomium* ; Citrus ; DNA, Ribosomal ; Methanol ; Phytophthora* ; Sporangia ; Thailand