四苯基卟啉蒽醌化合物的质子化热力学

表观质子化常数;电子吸收光谱;PM3;四苯基卟啉蒽醌化合物的质子化热力学     

单分散纳米Ni(OH)2的制备及其电化学性能

表面活性剂;单分散纳米Ni(OH)2的制备及其电化学性能     

Extraction of plasmid DNA from Escherichia coli cell lysate in a thermoseparating aqueous two-phase system

The primary purification of a 6.1 kilo base pair (kbp) plasmid from a desalted alkaline lysate has been accomplished by a thermoseparating aqueous two-phase system [(50% ethylene oxide-50% propylene oxide)-Dextran T 500]. The partitioning of the different nucleic acids (plasmid DNA, RNA, genomic DNA) in the thermoseparating aqueous two-phase system was followed both qualitatively by agarose gel electrophoresis and quantitatively by analytical chromatography (size exclusion- and anion-exchange mode) and PicoGreen fluorescence analysis. The experimental results showed a complete recovery of the plasmid DNA to the top phase, while 80% of total RNA and 58% of total protein was discarded to the bottom phase. Moreover, a 3.8-fold volume reduction of the plasmid DNA solution was achieved. By using a final thermoseparating step, the EO50PO50 polymer could be efficiently recycled, resulting in plasmid solution containing less than 1% polymer. The developed thermoseparating aqueous two-phase system shows great potential for the large-scale processing of plasmid DNA.     

量热法研究氯化铒与甘氨酸配合物的标准生成焓

量热法测定;量热法研究氯化铒与甘氨酸配合物的标准生成焓     

泽泻醇类化合物与血清白蛋白相互作用的分子机理研究

中药泽泻具有抗肿瘤作用,可能与血清中蛋白成分的改变有关.利用荧光光谱、圆二色谱结合分子模拟技术研究了模拟生理条件下泽泻有效成分泽泻醇类化合物与人血清白蛋白的相互作用.实验结果表明,23-乙酰泽泻醇B与蛋白的结合作用远强于24-乙酰泽泻醇A.分子模拟结果与实验一致,并且表明,结合强弱的差异与小分子的侧链结构有关.该结果可...     

用过剩压法生长金刚石过程石墨再结晶现象的研究

 描述了在过剩压驱动下金刚石晶种外延生过程中，大量伴生的石墨再结晶现象。再结晶石墨抑制了金刚石的自发成核；它们分布于合成腔触媒金属的低温区，结晶数量多，晶粒片状分层，尺寸大，但出现乱层晶体结构；同时产生一定数量的无定形碳。分析认为，这与长时间的低过剩压驱动，触媒金属内有足够的碳源供给，并具备在高温高压下石墨充分结晶但又达不到完全石墨化条件有关。还讨论了在低过剩压驱动下，促进金刚石晶体外延生长的碳源可能是活化的碳原子，而不是具有乱层结构特征的再结晶石墨。     

一种蓝色聚合物激光材料

聚合物作为一种有机发光材料,由于在平板显示和光电子器件中的良好应用前景而受到广泛研究［１～２］．近年来,一个重要进展是在聚合物中观测到了受激发射（简称Ｐｏｌｙ－ｍｅｒ激光）现象［３～６］．Ｐｏｌｙｍｅｒ激光最早是在溶液中实现的［３～４］．作为一种新型...     

液态甲烷的高温密度物态方程理论研究

 采用热力学统计理论研究了液态甲烷在高温高压下分子分解反应特点及该体系的物态方程。着重讨论了体系中CH₄-H₂分子间有效势对体系化学反应平衡及物态方程的影响,并根据实验Hugoniot点(p_H, V)优化确定出其exp-6势函数中的参数值。该势函数的排斥部分值比理想混合条件下Lorentz-Berthelot规则给出的势函数值低约50%,预示着高压下CH₄和H₂之间存在着某种亲合性。用该势函数计算得到的p-T线与现有的两个实验点符合很好。还讨论了CH₄-H₂之间的有效作用势参数对CH₄分子冲击离解度（x）的影响。     

Synthesis of SnO_2 nanorods from aqueous solution:The effect of preparation conditions on the formed patterns

<正>SnO_2 nanorods were deposited on the Si substrates in an aqueous solution containing both SnCl_4 and CO(NH_2)_2.It is found that different self-assembled patterns of SnO_2 nanorods can be obtained by changing the deposition conditions such as the molar ratio of CO(NH_2)_2 to SnCl_4 and the pretreatment of the substrate.Scattered SnO_2 nanorods,for example,can be changed into flower-like patterns when the molar ratio of CO(NH_2)_2 to SnCl_4 is raised,and well-aligned nanorod arrays can be formed when the pretreatment of the substrate is changed.In addition,some interesting patterns,e.g.tree-like patterns,can also be observed.