Four flavonols from the seed of Hibiscus sabdariffa Linn growing in Binh Thuan provinceCompound 1 was obtained as a yellow amorphous powder. The NMR spectra of 1 revealed characteristic signals of a flavonol skeleton. Indeed, the 1 HNMR spectrum of 1 showed a hydroxyl group at d 12.58 (1H, s) which was assigned to 5-OH of a 5,7- dihydroxy A ring system in flavonoid while two meta –coupled protons at dH 6.19 (1H, d, 2.0, H-6) and ...
4 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 60 | Lượt tải: 0
Asymptotic behaviors with convergence rates of distributions of negative - Binomial sumsDISCUSSIONS In some situations, it is quite hard to establish the limiting distributions for negative-binomial sums of i.i.d. random variables. Meanwhile, if the limiting distribution of the partial sum is stated, the limiting distribution of corresponding negative-binomial sum will be established by the Gnedenko’s Transfer Theorem (see10). Thu...
7 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 59 | Lượt tải: 0
The species composition and distributive characteristics of perciformes in Hau river basin in Can Tho city, Viet Nam- With regards to the family level, among the 14 families, Gobiidae had the largest number of genus (10 genera), made up 32.26%, followed by Osphronemidae (4 genera) and Eloetridae (3 genera) occupied 12.9% and 9.68%, respectively. Ambassidae, Nanidae and Polynemidae shared the same pattern, which was 2 genera and accounted for 6.45%. The rest o...
9 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 45 | Lượt tải: 0
A new earthworm of the genus pheretima (oligochaeta: megascolecidae) from the mekong delta of vietnam and taxonomical position of pheretima polychaetifera Thai, 1984In 1984, Thai Tran Bai published a new species to science among specimens collected in Long An Province. This new species has setal zone behind male pore areas, which is a very specific characteristic. Therefore, he called it Pheretima polychaetifera. When comparing this species with some different species which have similar setal zones, we beli...
8 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 57 | Lượt tải: 0
Initial result of the raising di long (Earthworms)Conclusion After one year of studying and experimenting on raising Di Long, we obtained the following initial result: - The mature Di Long (Pherrtima aspergillum) had the ability to survive, grow and breed in cultured conditions. - The mature Di Long was captured in nature still increased their mass during experimenting time. Particularly, th...
8 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 57 | Lượt tải: 0
A review of the bat fauna of Con Dao national park, Southern Viet NamHorseshoe Bats (Rhinolophidae) Bornean Horseshoe Bat (Rhinolophus borneensis) together with two leaf-nosed Bat species (Hipposideros bicolor and H. larvatus) were included in a previous publication but misclassified into the same family Rhinolophidae [6]. According to the current classification systems, they belong to two distinct families [1, 4...
6 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 58 | Lượt tải: 0
Application of a toxin-antibody conjugate to treat acute graft versus host disease in mice modelsDoxorubicin-anti-CD137 mAb conjugate effectively treated aGVHD Based on the above result, we treated aGVHD mice by intraperitoneal injection of anti-CD137-anibody-docxorubicin complex at 7 days to detect treatment effects. The GVHD mice were divided into 3 groups including untreated, anti-CD137 antibody treated and doxorubicin-anti-CD13-anibody ...
6 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 69 | Lượt tải: 0
Hydrophobic property of (R)-3 amidinophenylalanine inhibitors contributes to their inhibition constants with thrombin enzymeCONCLUSIONS The 2D-QSAR modeling has been successfully developed from 2D-descriptors of 60 (R)-3- amidinophenylalanine inhibitors associated with their inhibition constants, Ki. The established QSAR modeling was internally, externally, and totally validated, demonstrating satisfactory statistical parameters. Hydrophobicity is an important des...
5 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 49 | Lượt tải: 0
Tác động của điều kiện oxi đến hiệu quả xử lý chất ô nhiễm dinh dưỡng và một số kim loại nặng và OctylphenolMetals and EDCs treatment The removal efficiency of metals ranged from 68% to 97% in both HSFCWs, especially Fe and Mn could be treated up to 90% (Fig 7), there was no difference in the efficiency of metal treatment between the aerobic HSFCW and the combined aerobic/anoxic HSFCW (P > 0.05) in the metal removal. These results are also consist...
8 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 43 | Lượt tải: 0
Thu nhận bột xương từ phụ phẩm cá hồi và ứng dụng trong sản xuất chả cá traThe formation and properties of protein gels not were only highly depending on fish species, the quality and kind of fish flesh but also effected by ionic strength, pH, temperature and other factors [21]. The addition of SBP which contains calcium may contribute to improve the gel strength due to the fact that the calcium ion may form ionic ...
7 trang | Chia sẻ: hachi492 | Ngày: 24/02/2022 | Lượt xem: 70 | Lượt tải: 0
