Anti-CD44 mAb remodels biological behaviors of spheroid cells with stemness from human ovarian cancer cell line SKOV-3

There is accumulating evidence that cancer stem cells (CSCs) play an important role in tumor progression. Novel strategies targeting CSCs have been widely researched. In the present study, we explored whether such CSCs existed in human ovarian cancer (OVCA) cell line and whether anti-CD44 antibody had effects on such subpopulation. We isolated and identified spheroid cells from SKOV-3. Then we used A3D8, an anti-CD44 mAb to treat spheroid cells with so-called stemness. Effects of A3D8 on spheroid cells’ biological behaviors were examined. Our findings showed that there was a small subpopulation that had so-called stemness in SKOV-3 cell line. Against spheroid cells, A3D8 can (1) inhibit cell proliferation; (2) change cell cycle distribution and expression of p21, CDK2 and cyclinA; (3) enhance cisplatin (DDP)-induced apoptosis; (4) promote cell differentiation; (5) inhibit clone formation efficiency; (6) reduce invasive efficacy; (7) inhibit tumorigenicity. Thus, to sum up points which we have just showed, spheroid cells isolated from SKOV-3 can be used as an appropriate in vitro model for relevant study of human ovarian CSCs. And our results reasoned that anti-CD44 therapy may become a potential promising strategy for OVCA treatment.     

Mechanism of oxidative damage to DNA by Fe-loaded MCM-41 irradiated with visible light

The mechanism of oxidative damage to deoxyribonucleic acid (DNA) by iron-containing mesoporous molecular sieves (MCM-41) irradiated with visible light was elucidated. Fe-loaded MCM-41 (Fe/MCM-41) was used as a photocatalyst and the damage to calf thymus DNA caused by hydrogen peroxide (H2O2) was studied. The damage and extent of oxidation of DNA were measured by high-performance liquid chromatography (HPLC) and intermediate products were detected by HPLC/electrospray ionization tandem mass spectrometry. Electron spin resonance was used to detect changes in reactive oxygen species and peroxidase catalytic spectrophotometry was used to determine the concentration of H2O2. The results indicated that Fe/MCM-41 efficiently activated H2O2 in solution at pH 4.0-8.0 under irradiation with visible light. The photocatalytic system degraded DNA most effectively at pH 5.0-6.0 but also operated at pH 8.0. At pH 4.2, the degree of DNA damage reached 25.65% after 5 h and the kinetic constant was 5.89×10 2 min 1. Damage to DNA was predominantly caused by hydroxyl radicals generated in the system. The mechanism of DNA damage is of potential concern to human health because it can occur in neutral solutions irradiated by visible light.     

单片机指令的实质与应用

本文从实用角度讨论了ＭＣＳ－５１系列单片机几条指令的实质，指出对汇编语言指令的理解与应用不能只停留在指令字面意义的简单表达上，而应该了解指令的详细执行过程，掌握其实质．     

聚乙烯醇缩对甲酰基苯偶氮变色酸类显色剂的提纯方法

报道了一种用纸色谱选择展开剂范围，薄层色谱确定展开剂，干层柱层析法提纯高分子显色剂的新方法．通过薄层色谱，元素分析及红外光谱测定证明，提纯的结果令人满意     

神经元调节器在双闭环直流调速系统中的应用

叙述人工神经元调节器的结构和原理，给出联接权训练算法的实现方法，设计人工神经元作调节器的双闭环直流调速系统的动态结构，并进行系统仿真研究。     

特性数据模拟的一个简便方法

用Ｅｘｃｅｌ电子表格软件对一元和二元函数的物性数据进行模拟。模拟用的方程来自原始公式、化工热力学、物理化学或经验模型，在多数情况下计算值和实验值之间的误差小于１％，从而为化工计算提供了新的实用手段。     

桑塔纳330K8BLOL柴油机轿车传动系统传动比的优化

对桑塔纳３３０Ｋ８ＢＬＯＬ型轿车以１．９ＬＴＤＩ柴油机为配套动力时，从动力性和经济性角度对传动系统的参数进行了优化，提出了合适的变速器传动比和主传动比．使用ＳａｎｔａｎａＬＸ五档变速器，且主传动比为３．８８９，可使轿车动力性有所提高，并且使油耗减少３０％左右．     

细茎大豆（G.gracilis）rbcS基因结构与分子进化分析

从细茎大豆的嫩叶中提取总ＤＮＡ，用ＰＣＲ方法扩增得到包含完整编码区的ｒｂｃＳ基因并将其克隆到ｐＢＬＵＥＳＣＲＩＰＴ载体中。完成全基因１０８９个核苷酸测序后，运用ＰＣＧＥＮＥ进行顺序编辑和同源比较，并应用ＭＥＧＡ１．０２１软件中的Ｎｅｉｇｈｂｏｒ－ｊｏｉｎｉｎｇ方面画出Ｒｕｂｉｓｃｏ小亚基仓的系统进化树。     

The Surface Properties and Tensile Strength of HSPE Fiber Treated by Controlling Oxidation in Chromic Acid

This work reported on the surface modification of high strength polyethylene(HSPE)fiber by chemical etching in chromic acid.The surface chemistry,the functional group contents, the wetting ability, the surface morphology and the tensile strength of modified fibers were investigated. The results show that, the surface roughness,surface wet properties and active functional group can be introduced on the HSPE fiber surface by this method,which will improve the interface adhesion in the composites, and the decrease of the tensile strength of modified fibers can be controlled.