Immediate prenatal diagnosis of Zellweger syndrome by direct measurement of very long chain fatty acids in chorionic villus cells

We report a gas chromatographic-mass spectrometric method which allows the very long chain fatty acids content of trophoblastic tissue to be directly measured in samples collected by biopsy between 8 and 11 weeks of gestation. This method has been successfully applied to the detection of fetal Zellweger syndrome in two pregnant women who had previously delivered affected infants. In one of them, increased concentrations of C26:0 (0.254 versus 0.108±0.035 μ/mg proteins) and C24:0 (1.32 versus 0.815±0.325 μ/mg proteins) in trophoblast indicated that the fetus had Zellweger syndrome, a diagnosis confirmed by pathological findings after abortion. In the second case, the pregnancy was allowed to proceed, on the basis of normal concentrations of very long chain fatty acids in trophoblastic tissue, and its outcome was actually a healthy newborn.     

Direct hydride derivatization of methyl- and ethylmercury chlorides in aqueous solution with KBH4

A convenient hydride derivatization procedure of methyl-and ethylmercury chlorides to volatile hydrides was reported. In sealed vials methylmercury and ethylmercury compounds in acidic aqueous solutions were converted into their volatile forms by the reaction with potassium tetrahydroborate(KBH4) and elvolved to the headspace of the vials. The gaseous analytes in the headspace were extracted and concentrated by solid phase microextraction(SPME) and injected into gas chromatography (GC) for separation and identified by mass selective detector(MS).     

海洋四水团混合的定量化分析和方法比较及其在东海西南海区的应用

通过构造理想的四水团混合模型,对传统温-盐二指标图解和三指标钜阵求解分析水团混合的方法进行比较,认为三指标估算结果更接近真实值.但温、盐数据因为易得且准确性好,所以传统方法仍具有一定的实用价值.在东海西南海区的应用中,检验了天然放射性226Ra核素作为第三个指标的可行性,并对实际水团混合情况进行了评估.证实黑潮次表层水在夏季顺陆坡边缘爬升后沿底部向岸运移,并在近岸涌升,是东海陆架区营养盐外源补充的一个重要动力.     

等离子体技术处理环境污染物进展

概述了等离子体的概念、分类，介绍了冷等离子体在废气、废水、固体废弃物处理等方面的应用，讨论了存在的一些问题。等离子体技术在环保领域具有良好的发展前景。     

Toluene removal characteristics by a superimposed wire-plate dielectric barrier discharge plasma reactor

A superimposed wire-plate dielectric barrier discharge reactor was used to remove toluene in this study. The effects of oxygen content, gas flow rate, gas initial concentration and with/without catalyst on toluene decomposition were investigated. It was found that an optimal toluene removal was achieved when the oxygen content was about 5%. Under this condition, the highest toluene removal efficiency of 80.8% was achieved when the gas concentration was 80 mg/m^3. The toluene removal efficiency decreased with the increase of the gas flow rate and the initial concentration of toluene. In addition, the ozone concentration decreased with the increase of the initial concentration of toluene. It suggested that combining DBD （dielectric barrier discharge） with Co3O4/Al2O3/foam nickel catalyst in-situ could improve the toluene removal efficiency and suppress ozone formation. Products analysis showed that the main products were CO and CO2 when oxygen was more than 5%.     

氢化物发生一原子荧光光谱法测定气田废水中的痕量砷

采用氢化物发生－原子荧光光谱法测气田废水中的痕量砷。方法有取样量少，操作简单、灵敏度高、准确度高、重现性好等优点。砷的测定线性范围为1～200ng/mL，方法的检出限为0．0453ng/mL，相对标准偏差小于等于1．6％，加标回收率在96．0％～97．7％范围内。测定密码标样与气田废水中的痕量砷，获得了满意的结果。     

干法烟气脱硫反应的实验研究

本文建立了干法烟气脱硫反应的实验装置 ,对以氧化钙为脱硫剂的干法烟气脱硫反应进行了实验研究 ,并利用压汞仪分析反应过程中参与反应的固体颗粒的孔隙结构的变化情况 ,对干法烟气脱硫反应过程中的固体颗粒孔隙结构特性进行动态分析 ,揭示和确定了反应过程中固体颗粒孔隙结构变化规律和脱硫转化率。研究结果表明 ,孔隙结构 ,包括孔径分布、最可几孔半径等是决定和影响干法烟气脱硫反应的因素 ,其中孔隙率决定脱硫反应的最终转化率 ,孔隙分布则控制着反应的过程特性。     

长江常熟段排污口布置方案数值模拟论证研究

为合理确定常熟氟化工项目排污口布置方案 ,本文在分析长江常热段水环境特征的基础上 ,针对其复杂的水下地形和水流流场 ,建立了较为准确和实用的平面二维水流水质耦合数学模型 ,预测计算了三套方案污水对重点保护水域影响程度和范围 ,并从水流流场、水质影响评价、技术经济多角度对方案进行了比较论证 ,最终推荐污水江中排放的方案 ,为项目的工程设计和环境管理提供了科学依据。     

柯树背岩体铀金成矿远景分析

本文在研究柯树背岩体矿物岩石学特征基础上 ,通过对该岩体的铀金成矿元素丰度、铀金矿化类型、铀金矿石物质成分及成矿阶段的划分、矿脉的铀金含量及其相关关系、围岩蚀变及原生晕特点、铀金矿化控制因素的详细研究 ,从岩体的放射性地质地球化学特点、岩体蚀变及剥蚀强度、岩石化学及稀土元素地球化学、矿脉向深部的变化趋势等几个方面分析了该岩体的铀金成矿远景及今后找矿工作的意见 ,指出该岩体西体南部断续出现的柯树背—隘高断裂上盘 1km范围与下寮—大坑里断裂夹持区为铀金成矿远景区。     

Serum PAPP-A levels are depressed in women with fetal Down syndrome in early pregnancy

The value of maternal serum pregnancy-associated plasma protein (PAPP)-A in screening for Down syndrome in early pregnancy was assessed using stored samples. Seventeen cases of Down syndrome and 66 unaffected control pregnancies were studied. The median PAPP-A level in the cases was 0.42 multiples of the expected value in controls (p <0.0001). Eleven cases (65 per cent) had levels less than half the expected value compared with only six controls (9 per cent). A commercial assay kit is now needed so that prospective screening with this marker can begin.