Study on the Hydrolysis and Ammonolysis Kinetics of a Monochlorotriazinyl Reactive Dye

To understand the reaction behaviour of the reactive dye with amino groups on protein fibres, the reaction kinetics of competitive hydrolysis and ammonolysis of a monochlorotriazina reactive dye were studied at 50 -80℃ and pH = 8 - 10 by high performance liquid chromatography (HPLC). The results showed the pseudofirst-order phenomenon for the general reaction of concurrent hydrolysis and ammonolysis of the dyes. The ammonolysis reaction was always faster than the hydrolysis reaction in the range of temperature and pH employed, but the preference for ammonolysis to hydrolysis reaction decreased with the increase of temperature and pH value. The ratios of ammonolysis/hydrolysis rate constant reduced from 17.6 to 5.4 when the temperature increased from 50 to 80℃ in pH =10, and from 7.2 to 5.4 when the pH value increased from 8 to 10 at 80℃.     

氟核糖碘胞苷的合成新方法研究

在微波辅助下,以环胞苷为原料,以较高产率合成了具有重要生理活性的2'-脱氧-2'-氟-5-碘胞苷,反应时间短,条件温和,操作简单.所有的中间产物和目标产物均经1H NMR和13C NMR确证.     

Optical Properties of Fluorescent Dyes

Fluorescent dyes have been widely used these years. Because of the special optical performance, conventional CCM systems seem to be unable to predict the recipes of fabrics dyed with fluorescent dyes. In order to enhance the functions of CCM systems, the optical properties of fluorescent dyes in their absorption region were investigated. It has been found that there was a fixed maximum absorption wavelength for each fluorescent dyes whatever its concentration is. Both absorption region and maximum absorption wavelength of the dyes in solution are the same to those in fabric, and that the absorption is directly proportional to the concentration of the dye. So the optical properties obtained in solutions cna be applied for describing the optics performance of fluorescent dyes in fabrics.     

对提高硫化黑纱线染色质量的措施探讨

硫化黑染料在纱线染色中，经常易出现色斑、色差、色花等外观质量问题，影响了染色成品的质量。本文就此问题作了一定的探讨，并提出了改进措施和成功的染色工艺处方。     

新型三氮唑吡啶盐负载的脯氨酸手性离子液体的合成和表征

以脯氨酸和吡啶为起始原料,经多步中间体合成了新型三氮唑吡啶盐负载的脯氨酸手性离子液体,并对各中间体与目标化合物的结构进行了核磁共振、元素分析、高分辨质谱和熔点测定的表征.实验结果表明,各中间体及最终产物的产率为71%~88%.     

A conformationally isoformic thermophilic protein with high kinetic unfolding barriers

The basis for the stability of thermophilic proteins is of fundamental interest for extremophile biology. We investigated the folding and unfolding processes of the homotetrameric Thermoanaerobacter brockii alcohol dehydrogenase (TBADH). TBADH subunits were 4.8 kcal/mol less stable towards guanidinium chloride (GdmCl) unfolding compared to urea, indicating ionic modulation of TBADH stability. Strongly denaturing conditions promoted mono-exponential unfolding kinetics with linear dependence on denaturant concentration. Here TBADH unfolded >40-fold slower when extrapolated from urea as compared to GdmCl unfolding. A marked unfolding hysteresis was shown when comparing refolding and unfolding in urea. An unusual biphasic unfolding trajectory with an exceptionally slow phase at intermediate concentrations of GdmCl and urea was also observed. We advocate that TBADH forms two distinctly different tetrameric isoforms, and likely an ensemble of native states. This unusual supramolecular folding behavior has been shown responsible for formation of amyloidotic yeast prion strains and can have functional importance for TBADH. Received 9 November 2007; received after revision 19 December 2007; accepted 8 January 2008     

Hyperbranched Polymer-Based Electrolyte for Lithium Polymer Batteries

Solid polymer electrolytes have attracted much attention as electrolyte materials for all solid-state rechargeable lithium batteries, and poly （ethylene oxide） （PEO）-based polymer electrolytes axe among the most intensively studied systems Hyperbranched polymers have unique properties such as completely amorphous, highly soluble in common organic solvent and processible because of the highly branched nature.     

采用离子电流法与机体振动法检测爆震的比较

在试验中,采用离子电流法和机体振动法同时检测发动机的爆震,采用双通道示波器同时记录离子电流法和机体振动法检测到的信号,并通过波形对比和快速傅里叶变换对信号进行分析和比较。结果表明：2种方法均可以准确实现爆震测量;相对于机体振动法而言,离子电流法具有安装方便、信噪比高、信号处理简单、测量准确、成本低廉等优点,是一种具有应用潜力的新技术。     

白腐菌降解偶氮金属络合染料的研究

针对白腐菌的特性和独特的降解机理,用Corilus versicolor和Panus conchatus两种典型白腐菌降解金属络合染料,结果表明,白腐菌对这类染料有明显的脱色作用,经驯化的白腐菌对染料废液处理72h脱色率可达90％以上,测定了在特定条件下两种白腐菌产锰过氧化物酶（Mnp)和漆酶（Laccase)的活性,讨论了染料的脱色与酶活及菌丝产量高低的相关性,认为白腐菌对该类染料的脱色作用包括物理吸附和酶促降解两个方面。