Increased Exosomal MicroRNA-21 and MicroRNA-146a Levels in the Cervicovaginal Lavage Specimens of Patients with Cervical Cancer

Well-run screening programs for cervical cancer in the population at risk have been shown to result in a sharp decrease in the incidence and mortality of cervical cancer in a number of large populations. Expression patterns of a recently identified biomarker family, microRNA, appear to be characteristic of tumor type and developmental origin. Several tumors have been reported to actively release exosomes carrying microRNAs. The present study has determined the association of microRNAs with cervical cancer-derived exosomes. The cervical cancer-derived exosomes were enriched in the cervicovaginal lavages specimens and the abundance of exosomes and exosomal microRNAs was detected by electron microscopy, western blot analysis, RT-qPCR and microRNA target reporter vector. The microRNA-21 and microRNA-146a, which were up-regulated in cervical cancer patients, were associated with the high levels of cervical cancer-derived exosomes. In conclusion, we demonstrated the abundance of exosomes in the cervicovaginal lavage specimens of women with cervical cancer. Furthermore, our results indicated that abnormally high levels of microRNA-21 and microRNA-146a existed in the cervical cancer-derived exosomes and the two microRNAs were functional in 293T cells.     

原子荧光法测定水中痕量砷的实验探讨

采用AFS-8120双道原子荧光光度计测定水中砷含量,测定结果表明:标准样品相对误差小于5%,仪器检出限为0.017 0μg/L,砷标准曲线的线性范围定在1.00μg/L~10.00μg/L之间的测定结果较准确,为今后日常水质分析砷的检测提供了可靠保证。     

以陶瓷废料为掺合料的混凝土力学试验

采用对比试验的方式,主要对废料掺和下的混凝土试块与水泥、矿粉的试块进行了抗压强度、劈裂抗拉强度和抗折强度对比分析,指出将陶瓷废料应用在混凝土原材中,解决了生产成本高和环境破坏的不利影响,具有广泛推广运用的价值。     

Templated electrodeposition of Ag7NO11 nanowires with very high oxidation states of silver

The templated electrodeposition of 200 nm diameter nanowires of the argentic oxynitrate Ag(Ag₃O₄)₂NO₃ phase is reported. Their high surface-to-volume ratio and the high average oxidation state of Ag make these wires promising candidates for nanoscale redox processes in which both a high volumetric charge density and a high discharge rate are required. The antibiotic activity of these nanowires was demonstrated by inhibiting the growth of Bacillus cereus bacteria.     

Proteomic profile analysis and biomarker discovery from mass spectra using independent component analysis combined with uncorrelated linear discriminant analysis

A strategy based on Independent Component Analysis (ICA) and Uncorrelated linear discriminant analysis (ULDA) was proposed for proteomic profile analysis and potential biomarker discovery from proteomic mass spectra of cancer and control samples. The method mainly includes 3 steps: (1) ICA decomposition for the mass spectra; (2) selection of discriminatory independent components (ICs) using nonparametric Mann-Whitney U-test; and (3) selection of special peaks (m/z locations) as potential biomarkers by executing of ULDA on a mass spectra data set which was reconstructed with the m/z locations that collected from the selected discriminatory ICs. A colorectal cancer data set and an ovarian cancer data set were analyzed with the proposed method. As results, 9 and 10 m/z locations were selected as potential biomarkers for the colorectal and ovarian cancer data set respectively. The classification results of ULDA using the selected potential biomarkers yielded better results than fisher discriminant analysis (FDA) and principal component analysis (PCA), and could distinguish the disease samples from healthy controls on the independent test sets with 100% of sensitivities and specificities for the colorectal cancer dataset and 100% of sensitivity and 96.77% of specificity for the ovarian cancer dataset.     

多相编码信号谱相关特征检测与参数估计

基于时域和频域2种循环谱密度估计方法,研究和总结了多相编码信号的循环谱特征及其与信号参数的关系。提出了一种没有先验知识条件下多相编码信号参数提取方法。首先介绍了多相编码信号的表示形式,然后使用循环谱密度函数估计方法分析了信号的循环谱特征,在此基础上提出了基于循环谱特征的信号参数提取方法。通过对6个典型多相编码信号参数提取相对误差的计算,验证了该算法的有效性。     

NEMP毁伤效应数据自适应建模技术研究

为了在三维地理信息系统中实现NEMP毁伤效应的可视化,利用空间聚类技术对毁伤数据进行分析,得到毁伤数据的空间聚类检验指数;利用多分辨率建模技术的聚合-解聚方法和自适应算法,对毁伤目标空间进行剖分,得到MRRTP模型;该模型与传统的TEN模型混合,实现了NEMP毁伤效应的三维空间数据模型构建;为高效、完整地实现NEMP毁伤效应的三维表达以及空间分析提供了技术支持。     

一种新的自主导航技术-单相机视觉系统

文中提出了一种新的漫游车自主导航技术，将扫描激光器和摄像机相结合，以代替计算机视觉中配准的作用。这种方法可以大幅度节约探测时间，快速识别视场内的地形，从而可以显著提高深空探测中自主导航的速度。     

微提取—离子色谱法快速测定干红葡萄酒中亚硫酸盐

目的:结合离子色谱法的优势,对国标方法蒸馏前处理进行改进,建立一种快速测定干红葡萄酒中亚硫酸盐的微提取—离子色谱准确定量的检测方法。方法:样品通过微提取装置释放出二氧化硫,被氢氧化钠溶液吸收生成亚硫酸根,再将其氧化为硫酸根,经0.45μm滤膜过滤除杂后,用离子色谱仪进行测定。结果:亚硫酸根离子质量浓度为1.0～50 mg/L亚硫酸根浓度与其峰面积呈良好的线性关系,相关系数为0.999 9,检出限为0.24 mg/L。添加不同水平硫酸盐加标回收率平均值为95.2%～99.1%,相对标准偏差(RSD)为6.84%～8.65%。结论:该方法的前处理操作简单、快速,杂质干扰明显减少,适合批量样品的检测。     

Determination of melamine in milk powder,milk and fish feed by capillary electrophoresis: a good alternative to HPLC

BACKGROUND: Since September 2008, an increased incidence of kidney stones and renal failure in infants, associated with the ingestion of infant formula contaminated with melamine has been reported in China. Furthermore, melamine was not only found in many protein‐based food commodities, but also in the feeds for cattle and poultry. So it is necessary to develop a suitable method to determine melamine. RESULTS: A capillary zone electrophoresis (CZE) method for analysis of melamine was developed by use of running electrolyte containing 35 mmol L^?1 sodium dihydrogen phosphate at pH 3.5, with UV detection at 210 nm. Regression equation revealed linear relationships (r = 0.9999) between the peak‐area and the content of melamine from 0.8 to 80 µg mL^?1. The detection limit was 0.08 µg mL^?1. The method was successfully applied to the determination of melamine in milk powder, milk and fish feed, with the recoveries from 94.5% to 103.7%. CONCLUSION: The performance of the CZE method evaluated in terms of precision, limits of detection, accuracy and quantification were comparable and in good agreement with those obtained by the HPLC method, with the advantage of shorter analysis time and lower cost. Copyright © 2010 Society of Chemical Industry