Ordered pattern formation from dewetting of polymer thin film with surface disturbance by capillary force lithography

The dewetting process of thin polystyrene (PS) film with built-in ordered disturbance by capillary force lithography (CFL) has. been investigated in situ by AFM. Two different phenomena are observed depending on the excess surface energy (DeltaF(gamma)) of the system. When DeltaF(gamma) is less than a certain critical value (i.e., the disturbance amplitude is under a critical value), the PS film would be flattened and become stable finally by heating above T-g. While, if the size of the disturbance amplitude is larger than the critical value, ordered PS liquid droplets form by further dewetting. The pattern formation mechanisms and influencing factors have been discussed in detail.

Study on the phase behavior of BaEu2Mn2O7 through heat treatment of a single crystal

A new orthorhombic phase of BaEu2Mn2O7 with the space group of Ccmm (no.63) was identified for single crystals after heat treatment and its Crystal Structure was determined by single crystal X-ray diffractometry. The volume Of the unit cell has twice the fundamental tetragonal cell and corner-shared MnO6 octahedra are slightly distorted and Mn-O-Mn angle between the neighboring octahedra tilts with an angle by around 3 degrees from b-axis. It is concluded from the results of the heat treatment of single crystals at various temperatures that this orthorhombic phase changes into a tetragonal One With superstructure (P4(2)/mnm) at 402 K and changes once more into the fundamental tetragonal phase (I4/mmm) above 552 K. The tetragonal phase with superstructure which has been expected to be an unstable one is stable between the two temperatures.

Effect of lanthanum ion on peroxidase in plant

The interaction of MP-11 as a model of antioxidatase enzymes with La3+ was investigated. It was found that La3+ can increase in the non-planarity of heme and the content of alpha helix and beta turn conformations of the MP11 molecule. The change in the secondary structure of the MP-11 molecule can increase in the exposure extent of heme to the solution. Therefore, the electrochemical reaction of MP-11 is promoted and the electrocatalytic activity to the reduction of H2O2 is increased. The results are consistent with that for the interaction of peroxidases(POD), one of the antioxidatase enzymes, obtained in the living plant experiments at low concentration of La3+.

Fabrication and characterization of ordered oligoaniline film

highly organized phenyl-capped teraniline (PC-teraniline) film at the molecular level was fabricated on carbon surfaces by electrochemical reduction of diazonium salts. Cyclic voltammetry (CV). scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) were employed for the characterization of the film.

A novel dimer - Heteropolytungstate with a vanadium atom as the centre - Synthesis and structural characterization of (H3O)(4)[VW12O40Na (H2O)(4)](2)

A novel dimer-tungstovanadate, (H3O)(4)[VW12O40Na (H2O)(4)](2), was hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction, IR spectra, TGA-DSC thermal analysis and polarograpy. The yellowish crystal crystallized in the triclinic system, space group P1, a = 1.464 5(3) nm, b = 1.468 6(3) nm, c = 1.411 1(3) nm, alpha = 111.82(2)degrees, beta = 93.17(3)degrees, gamma = 117.47(3)degrees, V = 2.210 6(8) nm(3), Z = 1, D-c = 4.552 g . cm(-3), lambda (Mo K alpha) = 0.071 073 nm, mu = 31.402 mm(-1) F(000) = 2 6481 R = 0.078 0. The title compound consists of two Keggin structure units linked together with two hydrated sodium cations to form a dimer with a porous structure with the pore dimension of 0.766 nm X 0.778 5 nm.

西洋参中皂甙成分的研究

目的：研究西洋参水溶性部分的化学成分。方法：西洋参根８０％甲醇提取物的水悬浮液，乙醚、水饱和正丁醇萃取，水溶液部分大孔树脂柱脱糖，硅胶柱反复层析，光谱分析鉴定结构。结果：分得１种单体化合物，确定为丙二酸单酰基人参皂甙Ｒｂ１。另外还分得人参皂甙Ｒｂ１和人参皂甙Ｒｅ。结论：首次发现并鉴定了西洋参中存在的水溶性皂甙。

{MoOS_3Cu_3(PPh_3)_3Cl}的合成及晶体结构

本文合成并测定了{MoOS_3Cu_3(PPh_3)C1}的晶体结构,簇合物属正交晶系,空间群为P_(212121)晶胞参数:a=12.833(5)×10~(-10)m,b=17.552(5)×10~(-10)m,c=22.778(7)×10~(-10)m;Z=4。结构用直接法解出,经最小二乘法修正,偏离因子R=0.069.

STUDY ON POLYANILINE FILM WITH HIGH-DENSITY AND HIGH MECHANICAL STRENGTH

Free-standing film of polyaniline with excellent mechanical and electrical properties has been successfully prepared by using the solution-casting method. The results show that its tensile strength, Young's modulus and elongation at break are about 87.9 MPa, 1563.9 MPa and 10.2%, respectively. It is essential that the soluble polyaniline should be appropriately treated in some suitable organic solvents before making a free-standing film. Films having lustrous, smooth surface, high density and good flexibili...

土壤中常量元素的X射线荧光光谱测定

本文介绍了以低压聚乙烯垫底、镶边、粉末直接压片、X荧光谱定量测定土壤中常量元素的方法。用逐步回归法选择影响元素,并以散射内标与经验系数相结合校正基体效应,同时对“经验系数法”和“基本参数与经验系数结合法”进行了比较。

Cloning of cytoplasmic heat shock protein 90 (FcHSP90) from Fenneropenaeus chinensis and its expression response to heat shock and hypoxia

Heat shock protein 90 (HSP90) works as a multi-functional chaperone and is involved in the regulation of many essential cellular pathways. In this study, we have identified a full-length complementary DNA (cDNA) of HSP90 (FcHSP90) from Chinese shrimp Fenneropenaeus chinensis. FcHSP90 full-length cDNA comprised 2,552 bp, including a 2,181-bp open reading frame encoding 726 amino acids. Both homology analyses using alignment with previously identified HSP90 and a phylogeny tree indicated that FcHSP90 was a cytoplasmic HSP90. Real-time reverse transcription polymerase chain reaction analysis revealed that FcHSP90 was ubiquitously expressed in all the examined tissues but with highest levels in ovary of F. chinensis. FcHSP90 mRNA levels were sensitively induced by heat shock (from 25A degrees C to 35A degrees C) and reached the maximum at 6 h during heat shock treatment. Under hypoxia conditions, FcHSP90 mRNA levels, in both hemocytes and gill, were induced at 2 h and depressed at 8 h during hypoxia stress. The assessment of FcHSP90 mRNA levels under heat shock and hypoxia stresses indicated that the transcription of FcHSP90 was very sensitive to heat shock and hypoxia, so we deduced that FcHSP90 might play very important roles for shrimp to cope with environmental stress.

环境因子对养殖生物白斑综合症传播和分子生物标志物系统的影响研究

本文研究了海洋微藻在白斑综合症(white spot syndrome)暴发中的可能作用，以及阴离子表面活性剂十二烷基硫酸钠(SDS)和十二烷基苯磺酸钠(SDBS)长期暴露对紫贻贝(Mytilus galloprovincialis)生物标志物系统的影响(72 d)。 1．海洋微藻在养殖对虾白斑综合症传播中的作用研究 为了证实海洋微藻是否是养殖对虾白斑综合症的传播途径，我们首先将六种海洋微藻：球定边金藻(Isochrysis galbana)、中肋骨条藻(Skeletonema costatum)、小球藻(Chlorella sp. )、赤潮异湾藻(Heterosigma akashiwo)、锥状斯氏藻(Scrippsiella trochoidea)和盐藻(Dunaliella salina)，与人工注射感染白斑病毒(white spot syndrome virus)的成体日本囊对虾共同培养，用套氏PCR方法检测共培养的微藻能否携带白斑病毒。在此基础上，进一步研究了共培养后的海洋微藻是否能感染幼体日本囊对虾。研究结果表明，除了H. akashiwo，实验海洋微藻均可携带白斑病毒，但它们携带病毒的能力有明显差异，Chlorella sp.和S. trochoidea携带白斑病毒的能力较强；但是，与白斑病毒的其他携带者（如桡足类等）不同，携带病毒的海洋微藻10天后病毒检测结果均呈阴性。共培养后小球藻组可感染幼体日本囊对虾，但幼体携带病毒的量只能通过二步PCR方法才能检测到。上述结果表明，海洋微藻在WSSV的水平传播途径中具有一定的作用。 2．表面活性剂对紫贻贝生物标志物系统的影响研究 以青岛胶州湾现场调查数据为依据，选择阴离子表面活性剂十二烷基硫酸钠(SDS)和十二烷基苯磺酸钠(SDBS)作为污染物、以近海底栖生物紫贻贝为受试生物，研究了长期暴露后紫贻贝生化指标(SOD, CAT, GSH, GPx, GST, iNOS, AKP)和遗传毒理指标(AFLP指纹图谱)的变化。实验结果发现: 经过72d不同浓度暴露后，SDBS实验组紫贻贝体内的SOD、CAT和iNOS活性均有显著下降（除CAT 0.1mg/L组外），GSH、GST和GPx在3.0mg /L SDS、SDBS组较各自对照组均有显著升高。SDBS对紫贻贝生化指标影响的显著性水平大于SDS。统计分析显示，SDBS暴露组下GST与GPx呈显著正相关关系，iNOS与SOD也表现出一定正相关,但GSH与CAT、GSH与SOD呈现显著负相关关系。SDS浓度与GST呈显著正相关，而SDBS浓度与CAT呈显著负相关。另外，实验结果发现后闭壳肌中iNOS是一个具有应用前景的阴离子表面活性剂暴露生物标志物。AFLP标记结果统计显示，在实验给定的污染物浓度下，SDBS基因毒性要大于SDS；不同的DNA指纹图谱以及遗传距离图显示不同的污染物造成的DNA损伤是不同的。结果表明，在长期暴露条件(72 d)下，一定浓度的阴离子表面活性剂可以对岗哨生物紫贻贝的SOD, CAT, GSH, GPx, GST, iNOS和AFLP指纹图谱一组指标产生显著影响。

子午岭森林灰褐土保护有机碳的能力及各密度组分生化特征

物理保护是稳定土壤有机碳的主要方式之一, 为了理解在全球气候变化和碳循环中土壤作为碳汇(或碳源)所起的作用并正确管理土壤, 首先应该知道特定的土壤中有多少有机碳是被物理保护的. 通过密度分组和超声波技术将每个土样分为3个组分: 自由轻组、闭合组分和重组, 并分别分析每个组分的有机碳含量、碳水化合物含量和顽固性碳含量. 结果表明: (ⅰ) 整个土壤剖面上, 重组中的有机碳占明显优势, 自由轻组次之, 闭合组分中有机碳的分布最少, 说明土壤中大部分有机碳是受物理保护的. 随土壤深度增加, 自由轻组有机碳由25.27%下降为3.72%, 而重组有机碳由72.57%上升为95.39%, 闭合组分有机碳为2.16% ～0.89%. (ⅱ) 从顽固性指数看, 轻组碳和重组碳的顽固性是相似的, 甚至在土壤表层以下, 轻组碳的顽固性比重组碳的顽固性高, 说明轻组并非像经常定义的那样是最新鲜或很少被分解的组分, 并且在表层10 cm以下, 受物理保护的有机质, 其有机质质量也相对较高.

实时电子稳像算法研究

实时数字电子稳像是融合了图像处理、模式识别、电子、计算机、数字信号处理等多门学科为一体的新一代图像序列稳定技术，它具有稳像精度高、体积小、功耗低、成本低的特点。电子稳像技术实质上就是通过数字图像处理技术对序列图像进行运动估计进而进行运动补偿来去除图像帧间的诸如抖动、旋转等非正常偏移的一种技术。其中的关键技术是全局运动矢量估计，这也是本文的研究重点。 本文主要针对运动矢量估计算法进行研究，其中以块匹配算法和灰度投影算法作为重点研究对象。一方面对几种常用的块匹配算法进行仿真，对其应用于电子稳像的效果进行比较；另一方面对现在较常用的灰度投影算法进行仿真验证，把分区域进行灰度投影的思想应用于电子稳像，以消除内部运动物体的局部运动矢量对全局运动估计的影响。本文还设计了一种带校正的参考帧变换策略，兼顾了稳像的速度和精度。用本文的方法对实际场景的抖动视频序列进行稳像，达到了较好的稳像效果。