Xem 1-20 trên 130 kết quả Terpenoids
  • Phytochemical analysis of the leaves of Aglaia gigantea, Aglaia dasyclada and Aglaia oligophylla collected in Vietnam yielded three terpenoids, which included two triterpene Foveolin B (1), Niloticin (2) and one tetraterpene Lutein (3). The structures of these compounds were elucidated through extensive 1D and 2D NMR spectroscopy and analysis of their mass spectrometric data.

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  • Giáo trình Các hợp chất thiên nhiên có hoạt tính sinh học: Phần 1 do TS. Phan Quốc Kinh biên soạn trình bày các hợp chất thiên nhiên có hoạt tính sinh học đang được sử dụng làm thuốc, mỹ phẩm, thực phẩm chức năng cho người, các sản phẩm dùng cho nông nghiệp như các chất alcalloid, terpenoid, steroid.



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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Targeted isolation, sequence assembly and characterization of two white spruce (Picea glauca) BAC clones for terpenoid synthase and cytochrome P450 genes involved in conifer defence reveal insights into a conifer genome

    pdf13p panasonic06 25-12-2011 28 2   Download

  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Wertheim cung cấp cho các bạn kiến thức về ngành y đề tài: Pre-clinical development as microbicide of zinc tetra-ascorbo-camphorate, a novel terpenoid derivative: Potent in vitro inhibitory activity against both R5- and X4-tropic HIV-1 strains without significant in vivo mucosal toxicity...

    pdf11p toshiba21 18-11-2011 26 1   Download

  • Tại Việt Nam, cây lá diễn có mọc tại nhiều tỉnh ở khu vực phía Bắc nước ta. Cây dễ trồng và thời gian cho thu hoạch nhanh (khoảng 3 tháng). Cây này hoàn toàn có thể sử dụng làm nguyên liệu làm thuốc, nếu được nghiên cứu đầy đủ về thành phần hóa học, tác dụng sinh học. Vì vậy, nhóm nghiên cứu đã chiết xuất, phân lập một số thành phần và công bố trong bài viết này.

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  • Seven terpenoids were isolated from the dried leaves of Pinus dalatensis Ferré, including one caryolane sesquiterpenoid (1), five labdane diterpenoids (2, 3, 4, 5, 6) and one serratane triterpenoid (7). The structures of the isolated compounds were determined on the basic of spectroscopic methods (ESI-MS, NMR) and comparison with reported data. Among these compounds, the mixture of compounds 2 and 3 showed inhibitory effects on the growth of acute myeloid leukemia (OCI-AML) cells. This is the first report on the chemical compositions of Pinus dalatensis in Vietnam.

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  • The phytochemical investigation of the hexane extract from the twigs and leaves of Dacrycarpus imbricatus (Blume) de Laub led to the isolation of a rare sesquiterpene, spathulenol (1) along with three diterpenes named pimaric acid (2), trans-communic acid (3) and cis-communic acid (4). Their structures were determined by combination of spectral analysis and comparison with reported data. This is the first report on isolation of compound 1 from the Podocarpaceae family.

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  • Periodontitis is one of the most common oral diseases and is characterised by gingival inflammation and alveolar bone resorption (Savage et al. 2009). Periodontitis is a multifactorial irreversible and cumulative condition, initiated and propagated by bacteria and host factors (Kinane 2001). More than 500 different bacterial species are able to colonise the oral biofilm and up to 150 different species of bacteria are possible in any individual’s subgingival plaque.

    pdf114p pt_1669 26-03-2012 230 114   Download

  • terminator cassette casset kết thúc terminator sequence trình tự kết thúc terpenes terpen (hóa chất từ thực vật, tạo h−ơng vị cho thịt cá, khi cá ăn) terpenoids terpenoid terrestrial communities quần x∙ trên cạn territory l∙nh thổ tertiary structure cấu trúc bậc ba tertiary thickening hóa dày cấp ba tertiary wall vách cấp ba test vỏ hạt, vỏ, bộ x−ơng ngoài, vỏ giáp, mai testa 1.vỏ hạt 2.

    pdf32p zues05 22-06-2011 90 46   Download

  • The pH values will bring effects in flora and fauna nearby, change the taste of water and lead to heavy corrosion in pipe lines. High conductivity naturally indicates the presence of ionic substances dissolved in the river water. However, the result showed that 90% of the study site exceeded the data reported for non-contaminated rivers due to excessive metal ions within the water. At the site nearer to kaolin industry the conductivity is 852 times higher than the non-polluted study site. The industrial discharge also changed the hardness in river water.

    pdf76p lulanphuong 28-03-2012 62 14   Download

  • Terpenoid với sử dụng tiềm năng là Templates1 thuốc trừ cỏ tự nhiên . Giữa 60 và 70% thuốc trừ sâu được sử dụng trong nông nghiệp ở các nước đang phát triển herbicides.2 Ở Mỹ, nơi mà thuốc diệt cỏ chiếm ưu thế bán hàng thuốc trừ sâu, doanh số bán hàng của $ 4 tỷ USD dự kiến ​​của năm 2000,3 Thuốc diệt cỏ đã giúp nông dân

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  • This category features the broadest application of the use of credit ratings. Member authorities from every jurisdiction submitting responses indicated that their LRSPs contained provisions using credit ratings for the purpose of determining net or regulatory capital, and more LRSPs are applied to capital requirements than to any other category of use. Credit ratings were generally used in those LRSPs as a means of mapping credit risks to capital charges or risk weights.

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  • It has been a decade since book-length writing about law and the Internet began in earnest. Ethan Katsh’s wonderful book Law in a Digital World (1995) is just over a decade old, and anticipated the flood. My first book, Code and Other Laws of Cyberspace (1999), is just under. Most of these early books had a common character. We were all trying first to make the obscure understandable, and second, to draw lessons from the understood about how law and technology needed to interact.

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  • A truly distributed service would allow a client to use services by connecting to a broker nearest to the client’s geographical location. By having such local broker, a client does not have to re-connect all the way back to the broker that it was last attached to. If the client is not satisfied with the response times that it experiences or if the broker that it has connected to fails, the client could very well choose to connect to some other local broker.

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  • The Agency’s FY 2013 budget request supports the Administration’s commitment to ensure that all Americans are protected from significant risks to human health and protect the environment where they live, learn and work. The EPA’s work touches on the lives of every single American, every single day as we protect the environment for our children, but also for our children’s children. The mission, day in and day out, is to protect the health of the American people by keeping pollution out of the air we breathe, toxins out of the water we drink and swim in, and harmful chemicals...

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  • The dehesa is both a resilient and a fragile system; its resilience derives from the perseverance of its operators, and its fragility is its susceptibility to unfavourable economic factors that influence its profitability (Siebold, 2009). Livestock grazing is an integral management component of a dehesa and undergirds the conservation function of the system. The livestock component, including cattle, accounts for the largest fraction of revenue from the dehesa.

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  • Earlier in the year, when the affiliate rule was first implemented, the state expected that the planned expansion of Medicaid to non-elderly adults with incomes under 133% of poverty under the Affordable Care Act in 2014 would ensure that most of the low-income WHP clients would become eligible for Medicaid and that additional support might only be needed for those women with incomes between 138% and 185% of poverty.

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  • Currently there is uncertainty about the degree of difference in nutrient composition between conventionally and organically produced foodstuffs. Organic foodstuffs are those that are produced according to specified standards which, among other things, control the use of chemicals and medicines in crop and animal production, and emphasise protection of the environment. Recently published non-systematic reviews comparing nutrient composition of organically and conventionally produced foods have come to contrasting conclusions.

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  • Given the considerable variation in deposit insurance arrangements and the relatively large number of banking crises, it is possible to use this panel to test whether the nature of the deposit insurance system has a significant impact on the probability of a banking crisis once other factors are controlled for. We carry out these tests using the multivariate logit econometric model developed in our previous work on the determinants of banking crises (Demirg†e-Kunt and Detragiache, 1998).

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  • In this paper we show that nontraded goods (in ¯nal consumption and in retail services) play an important role in exchange rate behavior in the context of an otherwise standard open-economy macro model. In our model, nontraded goods have an important role even though °uctuations in the relative price of nontraded goods account for a small proportion of real exchange rate °uctuations. 3 Our quantitative study with nontraded goods generates implications along several dimensions that are more closely in line with the data relative to the model that abstracts from nontraded goods.

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