Rullia tuberosa L. is used for treatment of diabetes mellitus, anti-inflammation, etc. However, its hypoglycemic and anti inflammatory activities has not been investigated so far.In the present study, the α-glucosidase inhibitory, anti inflammatory activities of the extract of this plant were investigated. Our results showed that the crude extract as well as ethyl acetate and methanol fractions showed α-glucosidase inhibitory activity with IC 50 of 15.84, 4.73 and 8.27 µg/ml, respectively. In addition, the hexane and ethyl acetate fractions are capable of inhibiting LPS-induced NO production with IC 50 of 17.41 and 23.95 µg/mL, respectively. From the ethyl acetate and methanol fractions, eight compounds, including isobargaptol 5-O-β-D-glucopyranoside (1), syringaresinol (2), catechin (3), pulmatin (4), stigmast-4-en-3-on (4), verbascoside (5), hydroxymethylfurfural (6), rutin (7), and homoplantaginin (8) were extracted and isolated. Their chemical structures were elucidated by spectroscopic method including MS, 1D and 2D-NMR and comparison with the literature values.

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This study represents data on diatom composition in water samples collected in the Red River near Son Tay town, Hanoi. Diatom samples were selected from marcophyte and stone surfaces during dry season of 2014. 79 diatom species belonging to 8 families were identified. The most species rich genera are Nitzchia (16 species), Navicula (14 species), Gomphonema (5 species). There are five diatom species which are dominant in Red River diatom community including Navicularecens (30 % of the total community), Nitzschiapalea (9.3 %), Synedra fasciculate (8.1 %), Luticola minor (5 %) and Gomphonemaparvulum (2.8 %). The Oligosaprobous and α -m esosaprobous diatom taxa make up only around 3% and to 20 % of the total community. However, polysaprobous and ß-mesosaprobous taxa dominate in the Red River accounted 13 to 51 % total community.

Influenza A/H5N1 virus evolves rapidly and generate new variants, therefore it is essential to develop effective vaccines against the currently circulating influenza strains. Among clades and subclades of highly pathogenic avian influenza (HPAI) H5N1 viruses circulating in Vietnam, H5N1 clade 1.1 and clade 2.3.2.1c possess genetic relationships to many strains of influenza; thus they are suggested to be used for producing vaccines against avian influenza. In this article, two HA gene segments of two types of A/H5N1 influenza clade have been designed: HA clade 1.1 gene consists 1825 nucleotides encoding 565 amino acids, HA clade 2.3.2.1c gene consists 1822 nucleotides, encoding 564 amino acids. Most importantly, nucleotide sequence of the pathogenic region of HA was removed. Each of the two HA segments corresponding to the two clades were successfully cloned into pHW2000 vector and will be used as a candidate for production of avian influenza vaccines using reverse genetics technique.

Virus H5N1 thuộc chi virus cúm A, họ Orthomyxoviridae. Trong nhóm virus cúm A, H5N1 thuộc phân type có độc lực cao nhất, thường gây chết gia cầm hàng loạt và có khả năng lây sang người với dấu hiệu lâm sàng trầm trọng và tỷ lệ tử vong cao. Phương pháp phòng chống hiệu quả loại virus H5N1 là tiêm phòng vaccine. Vaccine cúm có hiệu quả cao và an toàn nhất hiện nay là vaccine được sản xuất bằng kỹ thuật di truyền ngược - cho phép thao tác với genome của virus, tái tạo hạt virus từ các cDNA tách dòng sau khi chuyển nạp vào tế bào động vật. Trong nghiên cứu này, chúng tôi đã tách dòng thành công sáu phân đoạn RNA (M, NP, NS, PA, PB1, PB2) của virus cúm vào vector pHW2000. Sáu plasmid tái tổ hợp khi kết hợp với plamid mang gen H5 và N1, biến nạp vào tế bào động vật sẽ là nguồn tái tạo chủng virus tái tổ hợp làm giống gốc cho sản xuất vaccine phòng chống cúm H5N1.