Efficient expression of human factor Ⅸ cDNA in liver mediated by hydrodynamics-based plasmid administration

The transfection of plasmid DNA into mammalian cells is an indispensable tool in the study of gene transfer and gene function. Since the original report in 1990 on the successful expression of a reporter gene in muscle[1], plasmid DNA injection has been widely used to mediate gene transfer study. As a gene transfer vector, naked DNA has many obvious advantages. It is easy and cheap to be prepared and more safe after transfection. But the plasmid mediated gene expression is low because of t…     

^210Pbex depth distribution in soil and calibration models for assessment of soil erosion rates from ^210Pbex measurements

Throughout the past decade, the potential for using nuclear weapon-produced 137Cs ( half-life 30.2 a) fallout to quantify soil erosion rates on both cultivated and uncul- tivated lands for medium-term timescales (≈ 40 a) has been successfully demonstrated in a wide range of envi- ronments in different regions of the world[1—6]. Because in difficulties of distinguishing Chernobyl-derived compo- nent from total 137Cs input in many parts of Europe, and in measuring low activity samples of…     

Cryptomelane（KxMn8-xO16）： Natural active octahedral molecular sieve（OMS-2）

The Xiangtan manganese deposit (XTM) used to be considered a supergene oxide manganese ore in South China. We reported a new identification of the naturally outcropping cryptomelane by examining the physical, chemical and structural features of the XTM supergene oxide manganese ore. The MnO2 content was over 90%, K2O more than 3%, and water from 2.2%-3.1% which is similar to one in zeolite. The cell parameters of the cryptomelane were given as a0 = 0.9974 nm, b0 = 0.2863 nm, c0 = 0.9693 nm and β= 91.47°. There was a larger pseduotetragonal tunnel in the natural cryptomelane that was formed by [MnO6] octahedral double chains with aperture of 0.462×0.466 nm2, filled with K cations resulting in some Mn3+ substituting for Mn4+ to balance the negative charges of structure. The finding is important not only for prospecting manganese resources in South China, but also in application of octahedral molecular sieve of natural cryptomelane as that developed in the tetragonal molecular sieve of natural zeolite o     

Discovery of the granulite xenoliths in Cenozoic volcanic rocks from Hoh Xil,Tibetan plateau

Two-pyroxene granulite and clinopyroxene granulite xenoliths have been recently discovered in the Late Paleogene toNeogene volcanic rocks (with ages in the range of 4.27～44.60 Ma) that outcropped in Hoh Xil, central Tibetan plateau. Based on theelectron microprobe analysis data, the xenoliths provide constraints for the formation equilibrium temperatures of the two-pyroxene gran-ulite being about 783 to 818℃ as determined by two-pyroxene thermometry and the forming pressure of the clinopyroxene granulite beingabout 0.845 to 0.858 GPa that is equivalent to 27.9～28.3 km depth respectively. It indicates that these granulite xenoliths represent thesamples from the middle part of the thickened Tibetan crust. This discovery is important and significant to making further discussion onthe component and thermal regime of the deep crust of the Tibetan plateau.     

水泥搅拌桩在太浦河泵站地基处理中的应用

太浦河泵站工程主泵房建基面在粉质粘土上，土力学强度较低，不能满足泵房对地基的强度和变形要求，必须进行地基处理.经过方案比选，主泵房地基采用水泥搅拌桩处理.检测结果表明，加固后的地基达到了预期的效果.     

放线菌YIM30997发酵特性及其活性组分提取方法的初步研究

菌株YIM30997是从云南省滇西北采集的土壤样品中分离得到的一株抗白粉病类抗生素产生菌.经发酵试验,通气量和发酵时间长短密切相关.经多种树脂吸附实验,AB-8吸附树脂具有较好吸附特性,可用于活性组分的提取和纯化.     

土地使用证管理计算机辅助系统设计

介绍了《土地使用证申报、调查、审核与颁发计算机辅助系统》（软件）的开发背景，软件的需求。功能、特点及实施过程，并提出了土地管理信息系统建设的一点思考。     

有限元法在口腔种植修复中的应用

采用ANSYS软件对口腔种植修复上部结构进行有限元静力分析，建立了下颌骨，邻牙、种植体及上部构造的三维正交各向异性模型，由应力云图分析了单颗种植入齿在3种不同牙尖斜度设计的条件下对种植修复的影响，为指导种植修复临床，提高种植修复的成功率，提供了理论依据。     

制备及处理工艺对Cu／WC复合材料性能的影响

对采用粉末冶金法制备的Cu／WC复合材料分别进行复压、轧制和热挤压、冷拔等处理，研究表明这些工艺均可不同程度地改善WC颗粒的分布，提高烧体的密度，硬度和导电性，特别是拉伸断裂强度的增加尤为显著。文中借助扫描电镜照片重点分析了不同工艺状态下拉伸断口的形貌和强度增加的原理，探讨了Cu／WC复合材料可能的断裂机理。     

固体酸催化合成乳酸正丁酯

评述了对甲苯磺酸、氨基磺酸、强酸性阳离子交换树脂、磺化聚氯乙烯树脂、六水三氯化铁、聚氯乙烯三氯化铁树脂、氯化聚氯乙烯三氯化铁树脂、十二水合硫酸铁铵、一水合硫酸氢钠、树脂负载三氯化铝、稀土化合物、固体超强酸、杂多酸、沸石分子筛和维生素C等催化剂催化合成乳酸正丁酯的方法。