https://scholar.dlu.edu.vn/handle/123456789/156 2026-03-05T17:15:33Z https://scholar.dlu.edu.vn/handle/123456789/6428 Title: Antibacterial activity and burn wound healing properties of biosynthesized silver nanoparticles using Mentha aquatica L. var. aquatica leaf extract Authors: Lê, Thị Anh Tú; Lê, Hữu Trọng Abstract: Introduction: Mentha aquatica L. var. aquatica is a commonly used herb with medicinal prop- erties. Phytochemicals in the leaf extract act as reducing and stabilizing agents during the bio- synthesis of silver nanoparticles (SNPs). The bactericidal and wound healing properties of SNPs biosynthesized from M. aquatica L. var. aquatica leaf extract remain largely unexplored. This study therefore aimed to optimize SNP biosynthesis from M. aquatica L. var. aquatica leaf extract and investigate its antimicrobial properties against S. aureus (gram positive) and P. aeruginosa (gram negative) and potential applications in wound care. Methods: SNPs were synthesized using M. aquatica L. var. aquatica leaf extract; AgNO3 concen- tration, amount of initial leaf extract, and reaction time were analyzed to evaluate the efficiency of biosynthesis. SNPs were characterized through UV–Vis absorption, dynamic light scattering, scan- ning electron microscopy, and transmission electron microscopy. The functional groups of the leaf extract and SNPs were investigated using Fourier transform infrared spectros-copy (FTIR). Further analyses using the well diffusion method and burn wound contraction were performed to investi- gate the antibacterial activity and wound healing properties of SNPs in mice. Results: Optimum SNP synthesis was attained with 5 mM AgNO3, 40 mg/ml leaf extract, and a reaction time of 1 h. FTIR analysis confirmed the involvement of phytochemicals in SNP syn-thesis. SNPs had an average size of 67.05 nm with an irregular spherical shape. SNPs inhibited P. aeruginosa (ATCC 15442) and S. aureus (ATCC 6538); the bactericidal effects were greater on P. aeruginosa than S. aureus. SNP dressings accelerated the wound healing process without causing weight gain in mice. Conclusions: SNPs biosynthesized from M. aquatica L. var. aquatica leaf extract inhibited P. aerugi- nosa and S. aureus. Dressings containing 10% SNPs accelerated wound healing in mice. SNPs could potentially be used as an antibacterial agent to promote wound healing. 2026-01-01T00:00:00Z https://scholar.dlu.edu.vn/handle/123456789/6426 Title: ẢNH HƯỞNG CỦA MẬT ĐỘ TRỒNG ĐẾN KHẢ NĂNG SINH TRƯỞNG VÀ TÍNH CHẤT GỖ CỦA CÂY GÁO TRẮNG (Neolamarckia cadamba (Roxb.) Bosser) TRÊN HAI KIỂU ĐỊA HÌNH KHÁC NHAU TẠI ĐỨC TRỌNG, LÂM ĐỒNG Authors: Nguyễn, Văn Giang; Trần, Văn Tiến; Nguyễn, Văn Bình; Lê, Bá Lê; Nguyễn, Thị Ái Minh; Hoàng, Việt Bách Khoa Abstract: Mô hình kinh tế nông lâm kết hợp đóng vai trò rất lớn trong phát triển kinh tế vùng Tây Nguyên nói riêng và cả nước nói chung. Trong nghiên cứu này chúng tôi xây dựng mô hình trồng cây Gáo trắng theo các mật độ ở các địa hình khác nhau tại Lâm Đồng nhằm đánh giá khả năng sinh trưởng và phát triển để chọn ra mô hình phù hợp cho chuỗi giá trị nông nghiệp bền vững. Kết quả cho thấy, cây Gáo trắng trồng trên địa hình khô ráo có chiều cao và thể tích thân vượt trội hơn so với trên địa hình bán ngập. Mật độ trồng tỷ lệ nghịch với sự phát triển về đường kính thân, đường kính tán và thể tích gỗ. Mật độ 2.500 cây/ha (2m x 2m) và 1.100 cây/ha (3m x 3m) cho thấy hiệu quả tăng sinh khối tốt hơn hai mật độ còn lại. Sau 24 tháng trồng, cây Gáo trắng đã có chiều cao tối đa là 345,31 cm, đường kính thân 11,19 cm, thể tích 15.797,12 cm3 và chỉ số thành phần hóa học gỗ C/N đạt 34,52. Nghiên cứu cho thấy việc lựa chọn mật độ trồng và điều kiện địa hình phù hợp không chỉ tối ưu hóa sự phát triển của cây Gáo trắng mà còn mở ra tiềm năng sử dụng gỗ của loài cây này trong sản xuất nấm, đóng góp tích cực vào mô hình kinh tế tuần hoàn. 2024-09-24T00:00:00Z https://scholar.dlu.edu.vn/handle/123456789/6425 Title: Halophytic Community of Foredunes in South-Central Coast of Vietnam 1 2 1 Hoang Thanh Truong, Le Ba Le , Nguyen Van Binh, Truong Thi Lan Anh , Nguyen Khoa Truong, Tran Thai Vinh , Nguyen Hoang Nghia , Quach Van Hoi , Nguyen Van Authors: Nguyễn, Văn Giang; Trần, Văn Tiến; Nguyễn, Văn Bình; Phan, Hoàng Đại; Nguyễn, Khoa Trưởng; Nguyễn, Thị Ái Minh; Lê, Bá Lê; Trương,Thị Lan Anh Abstract: The halophytic communities on foredunes are increasingly threatened by global climate change and human activities, particularly in the South-Central Coast of Vietnam. The botanical surveys were conducted across 41 study sites in eight provinces along foredunes in this region. The results show that halophytic community comprises 195 native taxa, 64 families, and 165 genera. Fabaceae is the most diverse family, with the highest number of genera (20) and species (25), followed by Asteraceae (13 genera, 13 species), Malvaceae (10 genera, 12 species), and Poaceae (10 genera, 11 species), collectively representing 32.12% of total genera and 31.28% of total species. The ten most species-rich families contribute 55.38% of the total floristic diversity in the coastal foredunes while 37 families, comprising 57.8%, are represented by single genus and single species. The habit spectrum shows that the herbs predominate and constitute 23.59% (46 species) of the recorded taxa. These findings suggest that the halophytic composition of foredunes in the South-Central Coast of Vietnam exhibits similarities to tropical desert regions in Southwest Asia, China, Pakistan. The composition of habits indicates the distinguished vegetation between incipient dune (creepers, prostrate, herbs, r hizomatous 2025-07-15T00:00:00Z https://scholar.dlu.edu.vn/handle/123456789/6409 Title: Green Gamma-Irradiated Chitosan/PVA–Silver Hydrogel for Efficient Methylene Blue Removal Authors: Nguyễn, Thị Huỳnh Nga; Le Thi Thanh Nhi; Pham Bao Ngoc; Tran Anh Tuan; Le Xuan Cuong; Tran Thanh Hoa; Trinh Ngoc Ai; Le Hoang Sinh; Dinh Quang Khieu; Nguyen Minh Abstract: In the context of increasingwater pollution by organic dyes, the development of environmentally friendly materialswith effective treatment capabilitiesis urgently needed. Thisstudy aimed to synthesize a biodegradable nAg-CS/PVAhydrogelwith high compatibility for dye adsorption applications. The dual gamma irradiation technique successfully synthesized nAg-CS/PVAhydrogel material from the immobilization of nAg-CS particles(particle size of 24.95 nm, a polydispersity index of 0.202, and zeta potential of + 20.7 mV)into the PVA polymer network. The formation of nAg-CS/PVAwas confirmed by FTIR, DSC, and FESEM analyses,which showed that the strong interaction between the functional groups of chitosan and PVA, combinedwith the superior complexation ability ofAg, contributed to the enhancement of gelation and swelling properties. The synthesized hydrogelwas applied to remove methylene blue (MB)with a maximum adsorption capacity (qm) of 285.71 mg g−1 under optimal conditions(PVAsolution 150 g l −1 , PVA:nAg-CS volume ratio of 8:2 and irradiation dose of 30 kGy). The neutron activation confirmed the successful immobilization ofAg nanoparticles, ensuring the minimalrelease ofsilverionsinto the environment. These findings highlight the potential of nAg-CS/PVAhydrogel as an efficient and environmentally friendly material forthe treatment of dye-contaminatedwastewater. 2025-11-25T00:00:00Z