Three new dibromopyrrole alkaloids from the South China Sea sponge Agelas nemoechinata

Three new dibromopyrrole alkaloids, 9-N-methylcylindradine A (1), 1-N-methylugibohlin (2), nemoechine H (3), together with one known dibromopyrrole alkaloid N-methyldibromoisophakellin (4) were isolated from the South China Sea sponge Agelas nemoechinata. Their structures were elucidated by comprehensive spectroscopic methods including HRESIMS and NMR, and the absolute configuration of compound 1 was further confirmed by comparison of optical rotation. Compound 3 exhibited moderate cytotoxic activity against K562 and L-02 with IC₅₀ values of 6.1 μM and 12.3 μM, respectively.     

A review of recent advances in catalytic combustion of VOCs on perovskite-type catalysts

Along with the rapid development of industry, VOCs gradually move into the spotlight, and now become a kind of harmful environmental pollutants that cannot be overlooked. This paper introduces the hazards of VOCs and the common catalytic combustion catalysts, noble metal catalysts and non-noble metal catalysts, for the elimination of VOCs. Perovskite catalysts, as one of the non-noble catalysts, play an important role in the field of catalytic combustion in recent years. According to the classification of elements doping in perovskites, the research achievements in the past five years were analyzed and reviewed. In addition, this paper also analyzes and elaborates the reaction kinetics and QSAR/QSPR models for the introduction of structural properties and reaction mechanisms.     

The 7th International Conference on Fluid Mechanics May 24-27,2015,Qingdao,China

正http://www.icfm7.org First Announcement and Call for PapersThe objective of International Conference on Fluid Mechanics(ICFM)is to provide a forum for researchers to exchange new ideas and recent advances in the fields of theoretical,experimental,computational Fluid Mechanics as well as interdisciplinary subjects.It was successfully convened by the Chinese Society of Theoretical and Applied Mechanics(CSTAM)in Beijing(1987,     

北太平洋海温与青岛汛期降水间的典型相关分析

利用典型相关分析方法，研究北太平洋前一年6月至当年8月的海温与青岛汛期6月至8月降水间的相关关系，并对1月和4月海温与降水间的相关性进行了详细的分析．结果表明青岛汛期降水与北太平洋海温主要表现为1年和半年的时滞，另外也出现同期相关的特性；青岛汛期降水与北太平洋1月和4月海温有明显正相关；1月和4月的几个关键海区与汛期降水有较好相关性、     

吸附伏安法测定中草药中的钼

叙述了测定痕量钼的一种灵敏的吸附伏安法。本法以钼（Ⅵ）和茜素红络合物在悬汞电极上的吸附行为为基础，在０．０１ｍｏｌ／ＬＮａＡｃ、０．０８ｍｏｌ／ＬＨＡｃ和１．５×１０－６ｍｏｌ／Ｌ茜素红底液条件下，该体系１．５、２．５阶微分吸附伏安法的线性范围是７．５×１０－１１～７．５×１０８ｍｏｌ／Ｌ；对２．５阶微分吸附伏安法，富集３ｍｉｎ的检测下限是５×１０－１１ｍｏｌ／Ｌ。用此法直接测定了中草药中的痕量钼。     

Dicitrinones E and F,citrinin dimers from the marine derived fungus Penicillium citrinum HDN-152-088

Two new citrinin dimers named dicitrinones E and F (1 and 2), together with one biogenetically related known citrinin monomer (3), were isolated from the marine derived fungus Penicillium citrinum HDN-152-088. All structures including the absolute configurations were elucidated on the basis of comprehensive spectroscopic data, and assisted by ECD calculations. Among them, compounds 1 and 2 belong to the class of citrinin dimers with a rare carbon-bridged C-7/C-7′ linkage. Compound 1 displayed antioxidant activity with IC₅₀ value of 23.73 μM.