产结晶纤维素酶的嗜热菌鉴定及其酶学性质

从云南腾冲热海温泉采集的样品中,分离出一株产结晶纤维素酶的嗜热菌TC-1.该菌株呈杆状,革兰氏阴性,生理生化特征分析和16S rDNA序列同源性比对表明它属于亚栖热菌属Meiothermus.结晶纤维素、木聚糖和葡萄糖可以诱导该菌产生结晶纤维素酶,其中结晶纤维素诱导的酶活力最高.对其产生的结晶纤维素酶进行了初步纯化与酶学性质研究,该酶的最适反应温度为70℃,最适pH为6.0,在50℃～70℃和pH5.5～6.5之间酶活力相对稳定.     

强磁性纳米材料CoFe2O4磁稀释体系磁化强度的表征

建立了一个表征强磁性纳米材料磁稀释体系磁化强度的新方法，该方法不同于传统的Gouy法．采用永久磁矩和未偶电子为零的无磁性物质为磁稀释体系，将纳米材料的强磁性稀释后，用Gouy磁天平表征了不同粒径系列的强磁性纳米材料CoFe2O4的磁化强度，探讨了纳米材料粒径与磁稀释体系磁化强度的关系．结果表明，谊方法具有样品用量少、数据准确、重现性好的优点．     

重复模糊简约合作对策核心的特征

将简约对策模型和模糊简约模型进行了拓展,加入重复模糊对策理论,构建了重复模糊简约合作对策模型并研究了其核心的公理化特征.     

Two-dimensional self-organization of 1-nonanethiol-capped gold nanoparticles

A two-dimensional (2D) ordered hexagonal close-packed structure, formed by 1-nonanethiol-capped gold nanoparticles, is reported. The structure was constructed only by dipping the gold nanoparticle colloidal solution on flat substrate. The gold nanoparticles were synthesized as follows: First, AuCl₄^-1 was transferred from aqueous solution to toluene by the phase-transfer reagent of tetraoctylammonium bromide. Then it was reduced with aqueous sodium borohydride in the presence of a given amount of 1-nonanethiol molecules which was used to control the nucleation and growth of the gold nanoparticles for the desired size. The experimental techniques, such as UV-Vis, FT-IR, and X-ray photoelectron spectroscopy (XPS), were employed to characterize the obtained product. Transmission electron microscopy (TEM) measurement demonstrated the size of the gold nanoparticle and the formation of two-dimensional ordered hexagonal close-packed gold nanoparticle structure.     

甘氨酸分子的电子结构和生物活性研究

用密度泛函理论法ROB3P86（6－31G*)计算出气相甘氨酸分子的8种构象，利用扩展的休克尔理论（EFT）研究了甘氨酸在生物过程中的最有效活性构象；分析分子中的原子净电荷，得出了甘氨酸分子的活性位。     

Preparation and characterization of 3-(triethoxysilyl) propyl isocyanate self-assembled monolayer on surface of chip

Monolayer of 3-(triethoxysilyl) propyl isocyanate was prepared on the slide by self-assembled tech-nique. X-ray photoelectron spectroscopy (XPS) was employed to analyze the elementary composition of the film. Contact angle of distilled water was measured to characterize the surface state. It was shown that 3-(triethoxysilyl) propyl isocyanate had been successfully assembled on the slide. The in-crease of contact angle to 80° demonstrated that the hydrophobicity of the surface of chip was in-creased signific...     

纳米氧化锌的制备与表征

以草酸和醋酸锌为原料，用室温固相化学反应首先制备前驱物二水合草酸锌，进而在微波场辐射分解，得到产物纳米氧化锌。用X－射线粉末衍射和透射电镜对产物的组成、大小及形貌进行表征。结果表明：产物纳米氧化锌为粒度分布均匀的球形六角晶系结构，平均粒径约为8nm。     

纳米ZrO2的超声沉淀法制备与表征

将超声辐射应用于以氯氧化锆(ZrOCl2·8H2O)和氨水(NH3·H2O)为原料的沉淀法制备纳米ZrO2粉体的工艺过程,制备出纳米ZrO2粉体。通过XRD、DTA／TG和SEM等技术研究了纳米ZrO2的合成过程及粉体性能。结果表明:超声辐射引入普通沉淀法,超声波的空化作用可使前驱体颗粒细化,抑制其团聚并延缓其向凝胶转变,从而可制备出ZrO2 纳米粉体;这种方法所得纳米ZrO2粒子外貌为球形,粒度分布均匀,分散性好。     

页岩气储层孔隙系统的多尺度联合表征及评价——以焦石坝龙马溪组为例

页岩气储层孔隙系统的研究是页岩气表征与评价的核心工作之一。鉴于页岩矿物成分复杂、孔隙组分多样,多种测试手段的联合分析已成为页岩孔隙系统研究中的一个发展趋势。综合氩离子抛光-扫描电镜、低温液氮吸附、CO2吸附、特高压压汞等对川东南志留系龙马溪组页岩的微观孔隙结构、孔径分布及连通性等进行了配套实验研究。研究结果表明:1页岩储层孔隙以100 nm以下的中孔和微孔占主导,其中孔径为10 nm左右的孔隙所占体积最大;2有机质发育及含量决定了页岩气储层孔隙发育情况及孔径大小分布,表现为随着TOC含量的增大,孔径大的孔隙部分逐渐增多,有效孔隙度逐渐增大;3多种实验手段联合测试才能获得页岩的多尺度孔隙全貌特征,而液氮-高压汞联合测试能反映其孔隙系统的基本特征。总体上,优质页岩气储层具有更大的微孔孔容、比表面积、孔径大小及有效孔隙体积,研究成果和结论对页岩气储层孔隙系统的综合表征和评价具有重要借鉴意义。