11-钨硼酸钾的合成、性质和结构研究

本文改进了文献中合成11-钨硼酸钾的方法。通过 x-射线粉末衍射分析确定了该化合物的晶体和阴离子结构。详细测定了文献中尚无报导的11-钨硼酸钾的 UV、1R 和 Raman 光谱性质,指认了主要的谱带;通过与四方钨硼酸和六方钨硼酸相比较,从光谱性质上进一步确证了 x-射线分析结果,并讨论了与两种钨硼酸在结构和性质上的联系。     

嗜甲基菌DM11菌株的二氯甲烷脱卤素酶是二聚体蛋白

经ＳＤＳ－聚丙烯酰胺凝胶电泳测定,嗜甲基菌ＤＭ１１菌株二氯甲烷脱卤素酶的亚基分子量为３１０００。通过沉降平衡超离心分析和凝胶过滤色谱分析证明,上述脱素酶的天然酶的分子量分别是６５８００和６３５００。这些结果表明,ＤＭ１１菌株的二氯甲烷脱卤素酶是二聚体蛋白。     

优半模的几个性质

本文给出了“优半模类模类”的一个反例,并且讨论了模与优半模的关系。     

Structural organization and cellular localization of tuftelin-interacting protein 11 (TFIP11)

Tuftelin-interacting protein (TFIP11) was first identified in a yeast two-hybrid screening as a protein interacting with tuftelin. The ubiquitous expression of TFIP11 suggested that it might have other functions in non-dental tissues. TFIP11 contains a G-patch, a protein domain believed to be involved in RNA binding. Using a green fluorescence protein tag, TFIP11 was found to locate in a novel subnuclear structure that we refer to as the TFIP body. An in vivo splicing assay demonstrated that TFIP11 is a novel splicing factor. TFIP11 diffuses from the TFIP body following RNase A treatment, suggesting that the retention of TFIP11 is RNA dependent. RNA polymerase II inhibitor (-amanitin and actinomycin D) treatment causes enlargement in size and decrease in number of TFIP bodies, suggesting that TFIP bodies perform a storage function rather than an active splicing function. The TFIP body may therefore represent a new subnuclear storage compartment for splicing components.Received 8 December 2004; received after revision 27 January 2005; accepted 8 March 2004The nucleotide sequence for the cDNA to mouse TFIP11 (previously known as TIP39 and TIP39kDa) has been submitted to Gen- Bank^TM/ EBI Data Bank with accession numbers AF290474 and NM_018783. The accession number for the human TFIP11 homologueis NM_012143.     

高功率天馈系统的设计——可控相位波导阵列天线

以磁化等离子体为终端负载,设计一种可控相位波导阵列天线的天馈系统,通过相邻波导间相位的任意调节,可以获得所期望的Ｎ１１功率谱,从而把高功率的微波有效地耦合到等离子体中。数值计算表明,该系统完全满足所设计的要求,为系统的设计提供了理论依据。     

Glucose-evoked recovery of hepatic thyroxine 5′-deiodinase independent of de novo protein synthesis in fasted rat

Summary The glucose-evoked recovery of Type I thyroxine 511l/xxlarge8242.gif" alt="prime" align="BASELINE" BORDER="0">-deiodinase activity in the hepatic microsomes of fasted rat was not inhibited by either cycloheximide, puromycin or actinomycin D during 3 h after glucose feeding; however, [³H]-leucine uptake by the liver or the hepatic microsomal fraction was significantly inhibited by cycloheximide and puromycin but not by actinomycin D. These results indicate that the glucose-evoked recovery of deiodinase activity may be independent of de novo protein synthesis.     

New C26 δ-lactones from the Dufour's gland of the urticating antTetramorium aculeatum

(6R^*)-{(2S^*)-2-hydroxyheneicos-12-enyl}-5,6-dihydro-2H-pyran-2-one (1)^o is the major constituent of the secretion of freshly dissected Dufour's gland of the urticating antTetramorium aculeatum. In solution, compound 1 is slowly transformed into (1S^*, 5R^*, 7S^*)-7-(nonadec-10-enyl)-2,6-dioxabicyclo[3.3.1]nonan-3-one (2)^o on standing. The structures of compounds 1 and 2 have been established on the basis of their spectral and chemical properties. Compound 1 could be responsible for the urticating properties of the ant.^o IUPAC numbering.     

一个同余式的简单证明

给出了下列同余式的一个简单证明∑ｐ－１ｋ＝１１ｋ２ｋ≡∑（ｐ－１）／２ｋ＝１（－１）ｋ－１ｋ（ｍｏｄｐ）．     

钛硅沸石的制备及其选择氧化性能

采用水热晶化法和气固相同晶取代法成功地合成了Ｔｉ－ＺＳＭ－５和Ｔｉ－ＺＳＭ－１１型分子筛；应用苯酚羟基化，苯乙烯氧化和丙烯环氧化反应为探针，详细考察了不同方法合成的钛硅沸石的催化性能。