Fe<Subscript>3</Subscript>O<Subscript>4</Subscript>@PAM@NTA-Ni<Superscript>2+</Superscript> Magnetic Composite Nanoparticles for Highly Specific Separation of His-tagged Proteins

A facile approach has been developed to synthesize Fe₃O₄@PAM (polyacrylamide) nanoparticles (NPs) with carboxyl groups on the surfaces by copolymerization with acrylamide and acrylic acid in Fe₃O₄ NPs aqueous suspension. Nitrilotriacetic acid (NTA) was conjugated to the magnetic NPs via well-known carboniimide chemistry using EDC and NHS. The Ni²⁺ ions loaded on the surface of NPs provide abundant docking sites for immobilization of His-tagged green fluorescent proteins (His-tagged GFP). The high magnetic property of Fe₃O₄@PAM@NTA-Ni²⁺ allows an easy separation of the NPs from solution under an external magnetic field, with high His-tagged protein binding capacity (42 μg protein/mg of NPs). The NPs can be recycled for at least four times without significant loss of binding capacity to proteins. These materials show great potential to separate His-tagged protein with low-cost purification at industrial scale.     

蛋白质和多糖在界面处的相互作用研究进展

蛋白质和多糖两种生物大分子在界面处的相互作用对于乳状液和泡沫体系有显著影响。蛋白质和多糖混合后的协同效应可构建新的、功能性的纳、微或宏观结构,改变食品的力学和流动特性,对改良食品,降低生产成本具有重要意义。本文对近年来蛋白质的界面行为,多糖的界面行为以及蛋白质-多糖复合物的界面行为所做的一些研究进行综述。      

丁腈橡胶、腰果油改性酚醛树脂的研究

以丁腈橡胶粉和腰果油改性酚醛树脂为改性剂，通过对多种原料、橡胶助剂、摩擦性能调节剂的研究和配方筛选，制得高性能载重汽车刹车片内衬材料。该材料磨耗低、抗冲击强度高、硬度和摩擦系数适中、高温抗热衰退明显，生产过程中可省去投资大、能耗高的密炼工艺，具有重要的工业价值。     

聚羧酸系高效减水剂的合成及其作用机理研究

分析了聚羧酸系高效减水荆的结构与性能之间的关系，探讨了减水剂分子的主链结构单元与支链结构单元的功能与作用，并分类介绍了聚羧酸系的分子结构设计及其合成的研究与进展。结果表明，聚羧酸系减水剂的性能与其分子结构的主链和支链的结构单元、官能团的位置及其种类有关。在分子主链上引入大量合适大小分子量的聚乙二醇或聚氧乙烯接枝链和少量它们的嵌段链及一定构成比例的磺酸基团，可使减水剂在发挥低掺量高分散性的同时，产生良好的保塑性，且在合成过程中发现，聚氧烷基中的端羟基易引起凝胶。在此基础上结合原料的来源及其成本，选用聚乙二醇与丙烯酸在对甲苯磺酸作催化剂的条件下进行酯化，然后与甲基丙烯磺酸钠进行共聚，并加入一定量的丙烯酸单体来调节主链的大小及侧链上的羧基与磺酸基的相对构成比例，从而得到一种高性能减水剂。     

Influence of nucleating agent on the formation of C4A3S

The reference test methods are carried out parallelly, by means of chemical analysis, X-ray diffraction, differential scanning calorimetry-thermogravimetry, scanning electron microscopy and polarized optical microscope to study the formation of C4A3S in the presence and absence of nucleating agent. The results show that nucleating agent with high calcium and low heat consumption as tricalcium silicate (C3S) promotes the formation of C4A3S and increases desulfurization degree obviously. During calcining raw meals doped with C3S, the grain sizes of C4A3S are larger compared with that without C3S. And at the same calcining level, the mass loss and the heat consumption belonged to CaCO3 decomposition is reduced.     

高温燃烧中和法测定玻璃中硫溶解度的研究

提出了一种测定玻璃中S溶解度的方法高温燃烧中和法,它简便实用、重现性好、成本低、易于实施。本文采用高温燃烧中和法,研究了样品量、助剂的比例、测试温度、测试时间等因素对玻璃中硫溶解度测定结果的影响,得到最佳测定条件：以氧气作载气、WO3作助剂,样品量为0.3g、助剂的比例为1：1、测试温度为1400℃时,测试时间为20min.     

用于荧光免疫检测的荧光纳米球制作方法研究

分别采用Stber溶胶-凝胶法、反相微乳聚合法和原位聚合法研究制得3种荧光纳米球:(1)羧基功能化二氧化硅(SiO_2)荧光纳米小球;(2)聚丙烯酰胺聚丙烯酸共聚物(PAAAM)荧光纳米小球;(3)SiO_2为核,PAAAM为壳的核壳结构SiO_2@PAAAM荧光纳米小球。以上3种纳米球具有较好的水分散性和稳定性。采用透过电镜、动态光散射和红外光谱、荧光光谱等对样品进行了表征。荧光光谱分析结果表明,荧光分子偶联加入量为1%(wt,质量分数)的3种纳米球均具有最大荧光强度。采用SNP@PAAAM纳米球与罗丹明红X(RhX)偶联,制得的SNP@PAAAM@RhX既可以很好的从水中离心分离也具有良好的水分散性,电动电位为-22.7mV,平均粒径90nm。所制备的3种荧光纳米球,可应用于快速体外检测、疾病追踪等重要领域。     

矿用双向非变频小型中继器的研制

提出了将地面移动通信应用于井下，并配备合适的中继器进行中继接力，实现井下移动通信的方案。设计了适于井下移动通信用的中继接力器，并对所设计的电路进行了实验调试。结果表明，利用井下双向非变频中继器实现井下移动通信是很有前途的。     

Analysis and Research of Multiplexing System

The development of optical transmission was summarized. The multiplexing system was show in detail. The concepts, characteristic, key technology, expand trend and application prospect of frequency-division multiplexing, time-division multiplexing, code-division multiplexing and wave-division multiplexing were illustrated.