Seminar khoa học chủ đề: Những tiến bộ bền vững trong biện pháp sinh học và tổng hợp vật liệu nano bằng plasma jet

Vào 14h00, ngày 04/12/2025 Viện IAST tổ chức buổi trao đổi học thuật tại Phòng họp lầu 5 Thư viện (Cơ sở Tân Hưng) và Phòng 604, 99 Trần Quốc Toản (Cơ sở Hà Nội) với nội dung chi tiết như sau:

1/ TS. Nguyễn Thị Thanh Loan trình bày về chủ đề: Exploration of a multifunctional biocontrol agent Streptomyces sp. JCK-8055 for the management of apple fire blight
Abstract: Apple fire blight, caused by the bacterium Erwinia amylovora, is a devastating disease of apple and pear trees. Biological control methods have attracted much attention from researchers to manage plant diseases as they are eco-friendly and viable alternatives to synthetic pesticides. Herein, we isolated Streptomyces sp. JCK-8055 from the root of pepper and investigated its mechanisms of action against E. amylovora. Streptomyces sp. JCK-8055 produced aureothricin and thiolutin, which antagonistically affect E. amylovora. JCK-8055 and its two active metabolites have a broad-spectrum in vitro activity against various phytopathogenic bacteria and fungi. They also effectively suppressed tomato bacterial wilt and apple fire blight in in vivo experiments. Interestingly, JCK-8055 colonizes roots as a tomato seed coating and induces apple leaf shedding at the abscission zone, ultimately halting the growth of pathogenic bacteria. Additionally, JCK-8055 can produce the plant growth regulation hormone indole-3-acetic acid (IAA) and hydrolytic enzymes, including protease, gelatinase, and cellulase. JCK-8055 treatment also triggered the expression of salicylate (SA) and jasmonate (JA) signaling pathway marker genes, such as PR1, PR2, and PR3. Overall, our findings demonstrate that Streptomyces sp. JCK-8055 can control a wide range of plant diseases, particularly apple fire blight, through a combination of mechanisms such as antibiosis and induced resistance, highlighting its excellent potential as a biocontrol agent.
 

2/ ThS. Nguyễn Thị Huyền trình bày về chủ đề: Synthesis of Cobalt Oxide Using a Plasma Jet Technique
Abstract: In this study, nano-structured Co3O4 was successfully synthesized using a plasma jet treatment technique. This method provides a simple, efficient, and environmentally friendly route for material fabrication. Plasma was directly discharged into a precursor solution containing PEG, which served as both a reducing agent and a surfactant, promoting the formation of well-defined Co3O4 nanostructures while eliminating the need for hazardous chemical reductants. The structural and morphological properties of the prepared materials were characterized using UV–Vis spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). Furthermore, the electrochemical performance of the Co₃O₄ nanomaterials was evaluated to explore their potential for energy-storage applications. Overall, the results demonstrate that plasma jet processing is a promising and sustainable strategy for producing high-performance electrode materials suitable for next-generation energy-storage technologies..