Electrical interaction between two cylinders with an ion-penetrable charged membrane in an oil/water interface

The electrical interaction between two long, parallel cylinders each is covered by an ion-penetrable charged membrane immersed in an oil/water interface is investigated. The effects of contact angle, radius of cylinder, and membrane thickness on the electrical interaction force are examined. The results of numerical simulation reveal that the following conditions lead to a greater electrical interaction force: (i) a larger contact angle, i.e. a larger fraction of a cylinder in the oil phase; (ii) a larger cylinder radius; and (iii) a thinner membrane. For a fixed ionic strength, the electrical interaction force is insensible to the type of electrolytes in the water phase, in general. However, if two cylinders are close enough, then the higher the valence of counterions the greater the electrical interaction force.     

拓扑指数法研究稀土显色剂结构与铈显色反应对比度的关系

计算了４３种不对称变色酸双偶氮膦酸型显色剂的Ａｍ拓扑指数，并将其与结构选择性因子相结合，用于偶氮类显色剂结构与铈显色反应对比度的相关性研究，讨论了显色剂结构对拓扑指数有译比度的影响。     

PtCl^2^—6接着PVP修饰电极及其对Fe^2^＋的催化氧化

研究了ＰｔＣｌ＾２＾－６接着ＰＶＰ修饰电极及其催化动力学，用循环伏安法考察了电极的电化学性质，结果表明在酸性溶液中对Ｆｅ＾２＾＋的氧化有显著的催化作用。采用旋转圆盘电极法，极化曲线法等就电极对Ｆｅ＾２＾＋氧化催化过程的控制步骤及有关动力学参数进行了测定。     

负载型镍金属催化剂上甲烷与二氧化碳重整制合成气

报道了负载型Ｎｉ金属催化剂的表面特征和对ＣＨ４与ＣＯ２重整制合成气的催化性能，反应结果和ＴＰＲ，ＸＲＣ结果表明：Ｎｉ担载量为９．０％的催化剂具有最佳的反应性能，Ｎｉ组分以高散表面化合物形式存在，助剂对催化剂活性的影响随载体和添加方式的不同较大差异，其中少量ＭｇＯ，Ｌａ２Ｏ３对改善催化剂的稳定性和抗积碳能力有十分显著的效果，载体和制备方法对催化剂性能具有明显影响，其中浸渍法制备的Ｎｉ／ＭｇＯ催化剂不     

优化几何构型对高级别从头算能量的影响

对《ＣＲＣ物理与化学手册》（第７７版）中第三周期以前的无机双原子分子,当其理论优化构型的相对误差大于２％时,分别在实验构型和最大偏差的理论构型下,计算了ＱＣＩＳＤ（Ｔ）／６－３１１＋Ｇ（３ｄｆ,２ｐ）能量并作了比较。结果表明,大多数能量的差别在４．２ｋＪ．ｍｏｌ＾－１以内。由此说明,目前一般采用的构型优化理论方法,多数情况下不至于明显影响单点高级别从头算的计算精度。同时还发现,Ｇ２（ＱＣＩ）的高级     

Sensitively probing the cofactor redox species and photo-induced electron transfer of wild-type and pheophytin-replaced photosynthetic proteins reconstituted in self-assembled monolayers

An ultrathin, ordered, and packed protein film, consisting of the 2-mercaptoacetic acid (MAA), polydimethyldiallylammonium chloride (PDDA), and wild-type (WT) photosynthetic reaction center (RC; termed as WT-RC) or its pheophytin (Phe)-replaced counterpart (termed as Phe-RC), was fabricated by self-assembling technique onto gold electrode for facilitating the electron transfer (ET) between RC and the electrode surface. Near-infrared (NIR)-visible (Vis) absorption and fluorescence (FL) emission spectra revealed the influence of pigment substitution on the cofactors arrangement and excitation relaxation of the proteins, respectively. Square wave voltammetry (SWV) and photoelectric tests were employed to systematically address the differences between the WT-RC films and mutant ones on the direct and photo-induced ET. The electrochemical results demonstrated that ET initiated by the oxidation of the primary donor (P) was obviously slowed down, and the formed P⁺ had more population as well as more positive redox potential in the Phe-RC films compared with those in the WT ones. The photoelectrochemical results displayed the dramatically enhanced photoelectric performances of the mutant ones, further suggesting the slow-down formation of final charge-separated state in Phe-RC. The functionalized protein films introduced in this paper provided an efficient approach to sensitively probe the redox cofactors and ET differences resulting from only minor changes in pigment arrangement in the pigment–protein complex. The favored ET process observed for the membrane proteins RC was potentially valuable for a deep understanding of the multi-step biological ET process and development of versatile bioelectronic devices.     

高效液相色谱检测反－2－苯基－邻－硝基肉桂酸

初探了反－２－苯基－邻－硝基肉桂酸（ＰＮＣＡ）的高效液相色谱分离，优选出了最佳分离条件。所建立的方法简单、快速，适用于工业生产中的控制及分析。     

Synthesis and optical properties of unsymmetrical conjugated dendrimers focally anchored with perylenes in different geometries

Two sets of light-harvesting monodendrons with unsymmetrical conjugated phenylacetylene branches and perylene cores, one with pi-conjugation from the branches to the core and one without, were synthesized and their photophysical properties were studied by steady-state and time-resolved spectroscopic methods. These monodendrons show comparably high fluorescence quantum yields and efficient energy-transfer properties.     

Determination of trace silver by solid substrate room temperature phosphorescence quenching method based on lead carboxymethyl cellulose particles (Pb(CMC)2) containing luminescent salicyl fluorenes molecules

Luminescent particles of lead carboxymethyl cellulose (Pb(CMC)2) containing salicyl fluorones (THBF), Pb(CMC)2-THBF were synthesized by the sol-gel method, using sodium carboxymethyl cellulose (NaCMC) as precursor and Pb2+ as precipitant. Pb(CMC)2-THBF can emit the intense and stable solid substrate room temperature phosphorescence (SS-RTP) on filter paper. And EDTA can chelate Pb2+ in Pb(CMC)2-THBF, causing it to decompose into aqueous soluble components PbY2-, CMC- and THBF, which can react with Ag+ to form Ag(CMC)2-THBF, causing the decrease of phosphorescence intensity. Based on the facts above, a new method for the determination of trace silver by SS-RTP quenching method was established. The linear range of this method is 8.0-40.0 fg spot(-1) (20.0-100.0 pg ml(-1)), with a detection limit (LD) of 2.2 fg spot(-1) (corresponding to a concentration range of 5.5 x 10(-13) g ml(-1)), and the regression equation of working curve is DeltaI(p) = 12.56 + 0.5527C(Ag+) (fg spot(-1), 0.4 microl spot(-1)), n = 8, r = 0.9992. This method has been applied to the determination of trace silver in human hair and tea sample with satisfactory results. The mechanism of SS-RTP emission is also discussed.     

甘氨酸与氯化碱金属在水中的焓相互作用参数

氨基酸在混合溶液中的热力学性质及相互作用的研究不论对溶液化学还是生命科学都是十分重要的．对此国内已有不少的研究h，’1．利用偿效应的方法研究氨基酸与电解质间的相互作用是很有效的卜一句，但大多数的工作都是在低浓度下研究一个氨基酸分子和一个电解质离子对间的相互作用烩．本文测定了甘氨酸在水中和在LICI、NaCI、KCI的水溶液中的溶解偿，计算出甘氨酸与各个公在水中的偿对相互作用参数和三相互作用参数，并由此讨论了甘氨酸与这些盐的对分子相互作用和三分子相互作用．1实验部分试剂：甘氨酸为ARfa，K甲醇一水重结晶．LI…