998 resultados para L111 .A6 1917 no. 9


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Fish stomach content records extracted from the DAPSTOM 4.5 database (held at the UK Centre for Environment, Fisheries and Aquaculture Science - CEFAS). Data collated as part of the EU Euro-Basin project and specifically concerning herring (Clupea harengus), mackerel (Scomber scombrus), blue whiting (Micromesistius poutassou), albacore (Thunnus alalunga) and bluefin tuna (Thunnus thynnus). The data set consist of 20720 records - collected throughout the northeast Atlantic, between 1906 and 2011 - mostly during routine fisheries monitoring research cruises.

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No. 9-18, 20-22 have special title-pages.

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本论文对红树林植物海榄雌的化学成分进行了研究,对其中分离得到的部分化合物进行了初步的生物活性筛选。 海榄雌采自海南东寨港,样品干燥后用氯仿甲醇(1:1)浸泡提取,合并提取物,先后用石油醚、乙酸乙酯和正丁醇萃取。得到石油醚相、乙酸乙酯相、正丁醇相和水相。 各部分采用常规的硅胶柱层析、制备薄层层析、凝胶Sephadex LH-20柱层析、反相硅胶柱层析、半制备HPLC以及重结晶等手段分离得到28个化合物。利用各种现代波谱技术(IR、UV、ESI-MS、FAB-MS、HR-FAB-MS、1D-NMR、2D-NMR等),确定了其中20个化合物的结构,其中包括2个新化合物:化合物A1 2′-O-(5-phenyl-2E, 4E-pentadienoyl)mussaenosidic acid和化合物A2 2′-O-(p-methoxycinnamoyl)mussaenosidic acid,以及13个首次从海榄雌中报道的化合物。 对得到的20个化合物A1-A20进行了DPPH自由基清除活性筛选,化合物A4、A5A6和A16表现出较好的活性,其IC50分别为9.61 μg/mL、8.55 μg/mL、11.72 μg/mL和7.73 μg/mL;化合物A13和A15表现出中等强度的DPPH自由基清除活性,其IC50分别为34.80 μg/mL和44.90 μg/mL;其他化合物只表现出微弱活性,其IC50均大于100 μg/mL;阳性对照BHT的IC50为18.00 μg/mL。 对分离得到的部分样品进行了抑菌活性测试,各样品在测试浓度下对测试菌均未表现出明显的抑菌活性。

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von David Koigen

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ser.9:t.19-20 (1914-1917);Table of Contents (1905-1917)

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Mode of access: Internet.

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Biography of Hermann Falck and story of his execution; contains copies of various letters.