http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/4 2026-09-16T02:45:15Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21849 Tín chỉ cacbon từ hệ sinh thái rừng ngập mặn và tiềm năng phát triển sinh kế bền vững của cộng đồng ven biển Việt Nam Nguyễn, Tâm; Nguyễn, Linh Trong bối cảnh biến đổi khí hậu và xu hướng phát triển thị trường cacbon, tín chỉ cacbon từ hệ sinh thái rừng ngập mặn là một giải pháp tiềm năng nhằm góp phần giảm phát thải khí nhà kính và hỗ trợ phát triển bền vững vùng ven biển. Bài báo này nhằm tổng quan về cơ sở khoa học về tín chỉ cacbon từ rừng ngập mặn, phân tích tiềm năng phát triển tại Việt Nam và đánh giá khả năng đóng góp cho sinh kế cộng đồng ven biển. Kết quả nghiên cứu cho thấy rừng ngập mặn Việt Nam có tiềm năng lớn trong phát triển tín chỉ cacbon. Tuy nhiên, việc phát triển lĩnh vực này vẫn còn gặp nhiều hạn chế như thiếu hệ thống đo lường - báo cáo - thẩm định (MRV) hoàn chỉnh, chi phí triển khai cao và cơ chế chia sẻ đồng lợi ích chưa rõ ràng. Nghiên cứu cũng cho thấy tín chỉ cacbon có thể tạo nguồn tài chính hỗ trợ bảo tồn rừng và phát triển sinh kế bền vững cho cộng đồng ven biển. Từ đó, đề xuất hoàn thiện khung pháp lý, nâng cao năng lực kỹ thuật và thúc đẩy các dự án thí điểm trong thời gian tới. 2026-09-11T00:00:00Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21845 Study on biocharacteristics of Symbiodinium sp. isolated from soft coral in coastal water of Quang Nam, south central Vietnam. Dang, Diem Hong; Pham, Van Nhat; Hoang, Thi Huong Quynh; Luu, Thi Tam; Ngo, Thi Hoai Thu; Nguyen, Cam Ha; Hoang, Thi Lan Anh; Nguyen, Hoai Nam; Nguyen, Thi Minh Hang; Chau, Van Minh Phototrophic dinoflagellates of the genus Symbiodinium (= zooxanthellae) are well known as symbionts of corals. They play an important role in maintaining the healthy as well as establishment of new reefs. In addition, products such as toxins or pigments from these symbiotic microalgae are potentially important for applications in the biomedical sciences, especially in new drug development. In this study, we isolated successfully a symbiotic microalga from soft coral Sinularia sp. which was collected in Cu Lao Cham coastal waters of Quang Nam province. Based on morphological characteristics and 18S rRNA gene sequences, isolated SHM8 strain was identified as Symbiodinium goreaui. This symbiont was cultured in different media such as ASP-A8, F2, ES, IMK, K, and L1. L1 culture medium supplemented with taurine concentration of 4.88 mM led to the cell density of SHM8 strain increased in 50% compared to control on day 2 in cultivation; amino acid mixture enhanced cell density by 31.7% on day 5 in cultivation. Supplementation of carbon source (bicarbonate salt of 16.8 g/L) and nitrogen source (nitrate salt of 0.055 g/L) enhanced the cell density by 40% and 27%, respectively on day 6 in culture. Obtained results in this study proved that this microalga can live independently without host. Successful isolation and cultivation of Symbiodinium microalga are one of the necessary conditions for promising researches on the natural bioactive substances from this microalgal biomass in the future in Vietnam. 2026-09-11T00:00:00Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21844 Extraction of bio - oil rich in omega 3-6 fatty acid using different methods from heterotrophic marine microalga Schizochytrium mangrovei. Le, Thi Thom; Nguyen, Cam Ha; Dang, Diem Hong In recent years, producing bio-oil from microalgae has gained increasing interest. Schizochytrium mangrovei is a heterotrophic marine microalga that is capable of producing high levels of biomass and lipid. In this study, S. mangrovei strain TB17 was investigated for production of bio-oil consist of omega 3-6 fatty acids using different methods, including a one-stage (direction transesterification of biomass) or a two-stage method (crude oil extraction followed by transesterification). In the one-stage method, omega 3-6 fatty acid alkyl esters (FAAE) extracted from dried biomass reached to 96.36% of total fatty acids (TFA), and 12.71% of dry cell weight (DCW) in which content of docosahexaenoic acid (C22: 6ω-3, DHA), eicosapentaenoic acid (C20: 5ω-3, EPA) and docosapentaenoic acid (C22: 5ω-6, DPA) was accounted for 85.01% of TFA. However, using fresh biomass as feedstock was resulted in lower yield of FAAE (90.95% of TFA and 3.26% of DCW). In the two-stage method, when fresh and dried biomass were used as feedstock, omega 3-6 free fatty acids (FFA) were obtained with equivalent yield (99.07% and 99.83% of TFA; 17.09% and 14.85% of DCW, respectively) with DHA, EPA and DPA contents accounting for over 80% of TFA. Thus, fresh biomass could also be used to extract bio-oil instead of dried biomass. These results would contribute to reduce manufacturing cost of the bio-oil rich in omega 3-6 fatty acids from Schizochytrium in the future. 2026-09-11T00:00:00Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21843 Optimization of fermentation conditions for squalene production by heterotrophic marine microalgae Schizochytrium mangrovei PQ6. Nguyen, Cam Ha; Hoang, Thi Minh Hien; Le, Thi Thom; Hoang, Thi Huong Quynh; Dang, Diem Hong Squalene is currently known as chemopreventive agents in reducing the incident of coronary heart disease and cancer. It is also a strong antioxidant used extensively in the food and cosmetic industries. Microbial sources of squalene are being explored in recent years. The objective of this study was to investigate fermentation conditions of Schizochytrium mangrovei PQ6 for high squalene production in 30L bioreactor. Squalene production was influenced by various nutritional factors such as glucose, nitrogen, vitamins etc. and physical factors such as batch and fed-batch fermentation. Our study established that fed-batch fermentation with nitrogen source of 1.2% yeast extract and 6.4% monosodium glutamate and 0.4% mixture of vitamin B1, 6 and 12 as optimal culture condition for maximal production of squalene by S. mangrovei PQ6. In fed-batch culture, the glucose concentration feeding was added up to 22% into the culture at 36 h of fermentation. The maximum squalene production was achieved 6.9 ± 0.1 g/L at 48 h of fed-batch fermentation, respectively. The values were 2-3 times more than that in fed-batch cultivation without adding mixture of vitamins and 4-6 times more than that in batch cultivation. Our obtained results are a breakthrough for the development of alternative squalene source from heterotrophic marine microalgae of Schizochytrium mangrovei PQ6 species for health-promoting functional foods. 2026-09-11T00:00:00Z http://tvhdh.vnio.org.vn:8080/xmlui/handle/123456789/21842 A proteomic analyses to assess the effects of chronic exposure of bisphenol a to adult zebrafish (Danio rerio). Ngo, Thi Mai; Do, Hong Lan Chi; Le, Phi Nga Bisphenol A (BPA) is an endocrine-disrupting compound found in the environment as well as in the plastic food containers for human use. Most impact of this compound to animals is acute toxicity to the liver of young individuals, but little is known about chronic toxicity to the adult liver. Here we report that, when adult zebrafish were exposed to various concentration of bisphenol A for 60 days, we have the number of liver protein spots in 2D-PAGE gels was reduced to 15-25%. Protein identification by HPLC-ESI (electron spray ionization) revealed that sixteen 2D-PAGE spots were remarkably altered and majority of them are related to metabolic energy system; e.g., liver basic L-lactate dehydrogenase B-B chain, ATP synthase subunit beta, and intracellular fatty acid-binding proteins. Besides, heat shock protein 60kDa 1 (HSPD1), which is known to associate with inflammation, was over-expressed in fish liver after exposure to 100 µg/l BPA, but not at lower concentrations of BPA. Thus, chronic exposure to environmental BPA may cause liver dysfunctions. Sixteen hepatic proteins identified in this study would be potential biomarkers for chronic BPA toxicity. 2026-09-11T00:00:00Z