一种新型织绵芋螺毒素可增强神经元钙电流

从中国南海织绵芋螺中分离出生物活性强、电生理效应特异的新的芋螺毒素。通过毒素分离纯化,并经生物活性测定,氨基酸测序,电生理效应等研究。分离到1种新的织绵芋螺毒素Tx7,它是由27个氨基酸组成。其序列为GCSSVCNSHTDCVTHCICTFRGCGAVN,并能引起小鼠痉挛,能增强海马神经元钙电流和提高兴奋性突触后电流的发放频率。实验表明Tx7具有较高的潜在应用价值。1实验部分1.1材料与仪器织绵芋螺,昆明种小鼠(20±2g),Bio-rad凝胶HPLC柱,BIFLEXⅢ型飞行时间质谱仪,491型蛋白质自动测序仪。     

Synthesis and Crystal Structure of 1,4-Bis(2-hydroxymethylphenyl)-1,4-dioxabutane

1 INTRODUCTION Macrocyclic ligands and their metal complexes have received much attention due to their applications in ion transport, ion separation and as models in biomimic researches[1~7]. The synthetic methods of macrocyclic ligands and their metal complexes are mainly divided into three kinds[8]. The first one is synthesizing free ligand, then forming the metal complexes; the second is template synthesis; and the third is synthesizing the end-off or side-off precursor ligand, then c…     

N-环丙甲基-7α-[(R)-1-羟基-1-甲基-3-(2-噻吩)丙基]-6,14-内乙基桥四氢去甲基蒂巴因(噻诺啡)合成和晶体结构

N-环丙甲基-7α-[(R)-1-羟基-1-甲基-3-(2-噻吩)丙基]-6,14-内乙基桥四氢去甲基蒂巴因(噻诺啡)是阿片受体部分激动剂.噻诺啡经过一步法合成其结构通过单晶X射线衍射分析确证,其结构保持吗啡"T"型主体结构.     

6′,6″-二吡啶基-2,2′:4′,4″:2″,2′″-四联吡啶稀土配合物的合成、表征及荧光性质研究(英文)

0 IntroductionMetallosupramolecular oligomers and polymerscan result from the interaction of metal ions with ap-propriate multidentate ligands designed for multinucle-ar binding[1,2], and there are considerable interests in thedesign of species containing known numbers of metalions in defined spatial arrangements. The electronic andphotophysical properties of oligopyridine complexes oftransition-metal ions make their incorporation particu-larlyattractive and the possibilityofinter-metallic ele…     

飞行时间质谱中的空间电荷效应研究

在分子多光子电离实验中, 发现母体离子的飞行时间(TOF)质谱峰随激光强度的提高而展宽, 此现象归因于离子团内离子间库仑排斥作用的空间电荷效应. 为从理论上解释此现象, 尝试了从一个简单的理论模型进行推演, 得到飞行时间质谱峰的半高全宽(FWHM)与激光能量、样品气体的分压比、电极板的总电压、离子质量及所采用的透镜聚焦焦距之间关系的解析表达式, 所得的结果能够很好地说明实验现象.     

A New Asterosaponin from the Starfish Culcita novaeguineae

A new asterosaponin named novaeguinoside A, along with a known saponin, asteronyl pentaglycoside sulfate, was isolated from the starfish Culcita novaeguineae. The new compound was identitied to be sodium 6α-O-{β-D-fucopyranosyl-(1→2)-β-D-fucopyranosyl-(1→4)-[β-D-quinovopyranosyl-(1→2)]-β-D-xylopyranosyl-(1→3)-[β-D-quinovopyranosyl}-5α-pregn-9(11)-en-20-one-3β-yl-sulfate by extensive spectral analysis and chemical evidence.     

Er~(3 ),Ho~(3 )和Tm~(3 )在硫氧化钆中的余辉发光

非放射性长余辉磷光粉作为美化和清洁光源在发光陶瓷、交通安全标志、紧急突发事件的照明设施、工艺美术涂料等众多领域得到越来越广泛的应用,引起人们的重视.到目前为止,文献报道的稀土长余辉磷光体的激活离子主要有铕离子(Eu3+和Eu2+[1-4]、三价铈离子(Ce3+)[5]、三价铽离子(Tb3+)[6]、三价镨离子(Pr3+)[7]、三价钐离子(Sm3+)[8].Ho3+,Er3+,Tm3+等稀土离子作为红外上转换发光材料的激活离子[9～12],而关于它们的长余辉发光的报道极少.最近,雷炳富等在Tm3+离子[13]激活的硫氧化钇体系中发现了长余辉发光.在此,我们通过高温固相法合成了Er3+,Ho3+和Tm3+掺杂的硫氧化钆长余辉磷光粉,观察到该体系中迄今未见文献报道的Er3+,Ho3+和Tm3+离子的长余辉发光.     

树脂吸附法处理水杨酸甲酯生产废水的研究

采用吸附树脂NDA—99处理水杨酸甲酯生产废水，结果表明该树脂时废水中的5磺基水杨酸及水杨酸均具有良好的吸附—脱附性能．废水经预处理和吸附处理后，CODCr由57000-59000mg／L降至6300mg／L左右，去除率接近89％．用IBV8％NaOH 3BVH2O作脱附剂，在温度为60℃、流量为IBV／h的条件下，脱附率接近100％，树脂可重复使用．高浓度脱附液经酸化、浓缩、冷却结晶，可回收5—磺基水杨酸，回收率为95％左右。纯度为78％。     

Preparation of Micron-size Functional Fluorescent Microspheres

As a kind of special functional microspheres, fluorescent polymer microspheres could be used in cell label and separation, blood flow assay, flow cytometer marking, chemical reaction assay,and in analyst of the transform and diffusion of particles in soil 1. However, one of the most important applications of fluorescent microspheres is in the high-throughput screening of drugs (HTS) 2. Through affinity interaction, radioactive ligands (latent drugs) are bound to fluorescent microspheres covered by receptor, and luminescence is produced by radioactivity, so ligands can be assayed and screened.In this study, we developed a technique for preparing micron-size fluorescent microspheres with different functional groups. The methods included the synthesis of micron-size polystyrene microspheres through the dispersion polymerization of styrene in different media such as ethanol,ethanol-water, and isopropanol; the functional polystyrene microspheres were prepared by introduction of functional monomers into the reaction system of styrene; the functional fluorescent microspheres were obtained by the way of dying functional microspheres in the fluorescent material's ethanol solvent.The average diameter of microspheres was in the range of 1～10 μm, and the distribution was normal distribution. The functional groups included -OH, -CHO, -COOH, -CONH2, and SO3H. The absorbing spectrum and exciting spectrum were tested, the results showed that the maximal absorbance of fluorescent microsphere was near 306.5 nm, and its maximal excitation was near 362 nm. The excitation spectrum of fluorescent material (DPO) and fluorescent microspheres were shown in figure 1, and it indicated that the developed fluorescent microspheres showed the same excitation behavior like DPO, which related to the fluorescent microspheres had stable luminescence property.     

快速响应的温敏性聚(N-异丙基丙烯酰胺)水凝胶 Ⅰ.以CaCO_3为成孔剂制备方法、表征及动力学研究

以不同粒径的CaCO3粒子为成孔剂 ,合成了快速响应的温敏性聚 (N 异丙基丙烯酰胺 ) (PNIPA)水凝胶 .利用扫描电镜观察到水凝胶具有特殊的孔状结构 ,得到水凝胶的孔径大小为几十微米左右 .动力学研究表明 ,该水凝胶在温敏膨胀或收缩时 ,具有快速的响应速率 ,在 10min内的失水率可达 90 % .比较了干凝胶和4 0℃下失水后的凝胶两种不同状态下水凝胶的膨胀曲线 ,发现两者的溶胀动力学曲线明显不同 ,前者的曲线有拐点 .同时发现与失水收缩速率相比 ,水凝胶具有较慢的吸水膨胀速率 .