Prenatal diagnosis of sacrococcygeal teratoma with constitutional partial monosomy 7q/trisomy 2p

We report the prenatal diagnosis of a fetus with sacrococcygeal teratoma and facial dysmorphism attributed to a constitutional terminal deletion of chromosome 7q and partial trisomy of chromosome 2p likely resulting from a de novo balanced translocation. The cytogenetic abnormality was diagnosed prenatally after sonographic detection of teratoma and confirmed on peripheral blood cells at birth. The newborn died of post-operative complications at seven days of age. FISH analysis demonstrated haploinsufficiency of HLXB9, a gene identified in the triad of a presacral mass (teratoma or anterior meningocele), sacral agenesis, and anorectal malformation, which constitutes the Currarino syndrome. Despite the absence of other features of the triad, the teratoma observed in the fetus we describe might represent a partial form of Currarino syndrome. Copyright © 2003 John Wiley & Sons, Ltd.     

高铝粉煤灰综合利用节能减排对比分析

高铝粉煤灰是近年来在我国内蒙古中西部地区发现的一种粉煤灰新类型,特别是鄂尔多斯高原东北缘的准格尔煤田,煤中富铝矿物燃烧后产生的粉煤灰中氧化铝含量达到50％左右,相当于我国中级品位铝土矿中氧化铝的含量。本文首先介绍了我国铝土矿的资源现状,然后叙述了目前国内外利用高铝粉煤灰提取氧化铝主要生产工艺及工艺特点,并对不同工艺的能源消耗和节能减排进行了对比分析。     

基于ANSYS技术的尿素高压气提塔管束剩余寿命的评估

以乌鲁木齐石化公司化肥厂尿素气提塔管束为例,运用ANSYS有限元分析技术,将设备剩余寿命评估技术引入到管板类高压设备剩余寿命的评估中,建立了一套完整的管板类高压设备剩余寿命评估体系与流程,给出了尿素气提塔管束剩余寿命的简化计算评估方法和有限元的精细计算评估方法,并根据剩余寿命评估实例对评估体系进行了分析和说明.     

基于风险的检测技术(RBI)在尿素合成装置中的应用

采用基于风险检测的(RBI)方法对尿素合成装置进行风险评估.根据风险评估结果对装置中的四大高压设备进行了风险排序,并给出了合适的检测措施,制定了基于RBI分析的优化的检验策略.通过评估,降低了设备的风险,提高了设备的检修效率,增加了企业的经济效益.     

遥感影像小波特征与城市大气污染相关性对比分析

PM10质量浓度是表征城市空气质量最为重要的污染指标之一.快速了解其浓度和大范围的分布状况,有利于控制PM10质量浓度,并最终提高空气质量.卫星遥感可在瞬间获取大区域的地表和大气信息,在污染监测上具有广泛的应用前景.本文在对覆盖杭州市2004年至2007年的MODIS数据进行了小波分析的基础上,建立了小波系数与同期PM10质量浓度实测数据的回归模型,并进一步比较了不同空气质量条件下的相应图像特征.初步实验表明,MODIS遥感影像特征与PM10浓度存在相关关系.     

利用空心微球和介电泳去除水中Pb~(2+)

利用空心微球吸附水中的重金属Pb2+,将悬浮液注入装有微电极阵列芯片的微介电泳池中,施加交流电压,用介电泳捕获悬浮液中的空心微球.同时,研究了空心微球吸附铅离子前后的介电迁移规律.结果表明,吸附了Pb2+的空心微球发生了正介电泳现象.此方法可以将吸附了重金属离子的空心微球捕集到一定的区域中,为工业废水中重金属离子的治理提出一种可能的方法.     

A novel approach to the sequential extraction of plutonium from oxic and anoxic sediment using sodium citrate to inhibit post-extraction resorption

Sequential extraction has been used extensively to study the solid partitioning of radionuclides in soils and sediments. A difficulty with sequential extraction is that radionuclides released by a particular extractant can be resorbed and artificially redistributed amongst the remaining solid phases. Here, we describe experiments (on selected model phase and natural materials), which were designed to determine whether the inclusion of a chelating agent (sodium citrate) in an established sequential extraction protocol (a) inhibits post-extraction resorption of plutonium, (b) increases non-targeted dissolution of sediment phases, and (c) gives rise to unwanted ligand competition for plutonium. The results clearly demonstrate the capacity of citrate to inhibit the resorption of plutonium from the various extractants, and confirm that there is no discernible increase in non-targeted phase dissolution, but indicate significant ligand competition with the carbonate phase. The merits of using citrate are discussed and an optimised sequential extraction protocol that includes citrate is proposed. Finally, the protocol is applied to oxic and anoxic sediments sampled in the NE Irish Sea and the Roads of Cherbourg, and it is shown that the bulk of the plutonium on these sediments is associated with the more labile geochemical fractions.     

V系列转基因银中杨(Salix alba var Tristis)与非转基因组长势差异的初步分析

经对鄂尔多斯市达拉特旗树林召镇的转基因试验林中的v系列转基因银中杨与非转基因对照组的生长性状的对比研究证明:该转基因系列具有较强的环境适应性,生长状况明显优于非转基因杨树。     

Variability of soil organic carbon reservation capability between coastal salt marsh and riverside freshwater wetland in Chongming Dongtan and its microbial mechanism

Two representative zones in Chongming Dongtan which faced the Yangtze River and East China Sea respectively were selected to study the variability of soil organic carbon (SOC) reservation capability between coastal wetland and riverside wetland in the Chongming Dongtan wetland as well as its mechanism by analyzing soil characteristics and plant biomass. The results showed the SOC content of riverside wetland was only 48.61% (P = 0.000 < 0.05) that of coastal wetland. As the organic matter inputs from plant litter of the coastal wetland and riverside wetland were approximately the same, the higher soil microbial respiration (SMR) of riverside wetland led to its lower SOC reservation capability. In the riverside wetland, the high soil microbial biomass, higher proportion of β-Proteobacteria, which have strong carbon metabolism activity and the existence of some specific aerobic heterotrophic bacteria such as Bacilli and uncultured Lactococcus, were the important reasons for the higher SMR compared to the coastal wetland. There were additional differences in soil physical and chemical characteristics between the coastal wetland and riverside wetlands. Path analysis of predominant bacteria and microbial biomass showed that soil salinity influenced β-Proteobacteria and microbial biomass most negatively among these physical and chemical factors. Therefore the low salinity of the riverside area was suitable for the growth of microorganisms, especially β-Proteobacteria and some specific bacteria, which led to the high SMR and low SOC reservation capability when compared to the coastal area.     

A survey of parabens in aquatic environments in Hanoi,Vietnam and its implications for human exposure and ecological risk

Environmental Science and Pollution Research - Seven parabens including methylparaben (MeP), ethylparaben (EtP), propylparaben (PrP), iso-propylparaben (iPrP), butylparaben (BuP), benzylparaben...