• Sinh tổng hợp TerpenSinh tổng hợp Terpen

    GPP vẫn còn một đơn vị pirophosphat alil nên nó cũng có khả năng đưa nhóm geranil vào một tâm thân hạch nữa. Việc này sẽ diễn ra trong sự sinh tổng hợp sesquiterpen. Sự sinh tổng hợp monoterpen chi phương Một khi GPP hình thành, có nhiều sự lựa chọn cho sự biến đổi tiếp theo, mỗi hướng biến đổi được kiểm soát diếu tố đặc biệt. Bước đầu tiên là...

    pdf12 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 680 | Lượt tải: 0

  • Secondary metabolites from the stem barks of Rhizophora mucronata lamSecondary metabolites from the stem barks of Rhizophora mucronata lam

    Abstract. Using various chromatographic separations, three phenolic derivatives (1‒3) and three phytosteryl glycosides (4-6) were isolated from a methanolic extract of R. mucronata Lam. stem barks. Their structures were elucidated to be cinchonain Ib (1), breynioside B (2), polystachyol (3), β-sitosterol 3-O-β-D-glucopyranoside (4), β-sitosterol...

    pdf12 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 623 | Lượt tải: 0

  • Anti-inflammatory effect of oligostilbenoids from Vitis heyneana in LPS-stimulated RAW 264.7 macrophages via suppressing the NF-κB activationAnti-inflammatory effect of oligostilbenoids from Vitis heyneana in LPS-stimulated RAW 264.7 macrophages via suppressing the NF-κB activation

    Abstract Background: Vitis heyneana is widely distributed in the north of Vietnam, it has been used in Vietnamese traditional medicine as an agent for treatment of arthritis, bronchitis, carbuncles and inflammatory conditions, and menstrual irregularities. However, this plant has not been investigated in phytochemical constituents and biological...

    pdf9 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 853 | Lượt tải: 0

  • Modification and comparison of three Gracilaria spp. agarose with methylation for promotion of its gelling propertiesModification and comparison of three Gracilaria spp. agarose with methylation for promotion of its gelling properties

    Abstract In order to improve the gelling properties of agarose, we modified it by methylation. The agarose was prepared from Gracilaria asiatica, G. bailinae, and G. lemaneiformis with alkaline, treated with diatomaceous earth and activated car‑ bon, and anhydrous alcohol precipitation. The methylation reaction process of agarose was performed w...

    pdf10 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 586 | Lượt tải: 0

  • Anti-cholinesterases and memory improving effects of Vietnamese Xylia xylocarpaAnti-cholinesterases and memory improving effects of Vietnamese Xylia xylocarpa

    Abstract Background: Alzheimer’s disease (AD) is the most common cause of dementia among the elderly and is characterized by loss of memory and other cognitive functions. An increase in AChE (a key enzyme in the cholinergic nervous system) levels around β-amyloid plaques and neurofibrillary tangles is a common feature of AD neuropathology. Amnes...

    pdf10 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 507 | Lượt tải: 0

  • Α-Glucosidase inhibitors from the bark of Mangifera mekongensisΑ-Glucosidase inhibitors from the bark of Mangifera mekongensis

    Abstract Background: Mangifera mekongensis (Anacardiaceae) is cultivated for its edible fruit and has been used in traditional Vietnamese medicine for its anti-aging properties and for treating diabetes, vermifuge, and dysentery. As part of a search for biologically active compounds with reduction of the rate of glucose absorption, a screening h...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 671 | Lượt tải: 0

  • Tyrosinase inhibitory activity of flavonoids from Artocarpus heterophyllousTyrosinase inhibitory activity of flavonoids from Artocarpus heterophyllous

    Abstract Background: Tyrosinase is an oxidoreductase that is very important in medicine and cosmetics because the excessive production of melanin causes hyperpigmentation. The development of novel, effective tyrosinase inhibitors has long been pursued. In preliminary tests, we found that an extract of the wood of Artocarpus heterophyllous (AH) p...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 590 | Lượt tải: 0

  • Synthesis and antibacterial and antifungal activities of N-(tetra-O-acet yl-β-d-glucopyranosyl)thiosemicarbazones of substituted 4-formylsydnonesSynthesis and antibacterial and antifungal activities of N-(tetra-O-acet yl-β-d-glucopyranosyl)thiosemicarbazones of substituted 4-formylsydnones

    Abstract Background: Sydnone is a heterocycle that exhibits remarkable pharmacological activities, including antimicrobial, anti-inflammatory, analgesic, antipyretic and antioxidant activities. Thiosemicarbazones are of compounds that contain the –NHCSNHN=C< linkage group and are considerable interest because they exhibit important chemical prop...

    pdf14 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 579 | Lượt tải: 0

  • Responses of green algae and diatom upon exposure to chromium and cadmiumResponses of green algae and diatom upon exposure to chromium and cadmium

    Abstract: In this study, the detrimental effects of trace metals on the growth of phytoplankton and the phytoremediation potential of microalgae from Vietnam are elucidated. Two green algae Scenedesmus accuminatus var biseratus and Scenedesmus protuberans, along with the diatom species Cyclotella sp., were exposed to chromium (Cr) and cadmiu...

    pdf5 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 537 | Lượt tải: 0

  • Các nhân tố ảnh hưởng đến quyết định mua nhà ở xã hội của người dân địa bàn tỉnh Vĩnh LongCác nhân tố ảnh hưởng đến quyết định mua nhà ở xã hội của người dân địa bàn tỉnh Vĩnh Long

    Abstract The research model is proposed by the author with six factors: Location, Financial Situation, Architecture, Legal, Habitat and Social Influence affecting people's decision to buy social housing in the province of Vĩnh Long. By surveying 347 inhabitants in the province of Vinh Long bought apartments in the housing residential quarters, and...

    pdf9 trang | Chia sẻ: thanhle95 | Ngày: 08/07/2021 | Lượt xem: 879 | Lượt tải: 1