Prenatal diagnosis of isolated bilateral microphthalmia with confirmation by evaluation of products of conception obtained by dilation and evacuation

We describe the prenatal diagnosis of isolated bilateral fetal microphthalmia in a woman at increased risk of having a fetus with microphthalmia. Ultrasound examinations at 161 and 19-5 weeks' gestation demonstrated bilateral fetal microphthalmia with no other associated structural defects. The patient elected to terminate her pregnancy at 19.5 weeks. Pathological evaluation of the products of conception obtained by dilation and evacuation confirmed the prenatal diagnosis of isolated bilateral fetal microphthalmia.     

石英羟基水-分子水的分馏系数与常规混合水δD分析的关系

采集了 4个不同地区花岗岩石英、热液脉石英 ,分析其中包裹体分子水与结构羟基水的含量、包裹体分子水的δDinclusion、结构羟基水的δDOH,计算了结构羟基水 包裹体分子水之间的D/H分馏系数αOH inclusion。考查了混合水 (结构羟基水 +包裹体分子水 )δDwhole water与单独包裹体水δDinclusion之间的差别 ,分析了这种差别与分馏系数αOH inclusion的关系。结果表明 :花岗岩样品中两种水之间的分馏系数小 ,分馏程度大 ,在常规分析中 ,若采用测定混合水δDwhole water值代表实际流体 (包裹体水 )δDinclusion值时 ,二者间有较大的差异。热液石英脉样品总体来说分馏系数接近于 1,分馏程度小 ,常规分析中引起的二者之间差异小。常规的分析方法用于分馏程度小的热液脉石英是可行的 ,但进行花岗岩石英水的氢同位素分析时有必要区分出包裹体水与羟基水。     

钢渣湿法脱硫试验研究

以某厂钢渣为吸收剂,以旋流板塔为吸收器,对湿法脱硫进行了试验研究。通过分析钢渣脱硫前后的化学成分变化,以及试验脱硫率随反应过程的变化,提出了钢渣湿法脱硫的反应机理。同时,试验研究了液气比、进气SO_2浓度、浆液浓度等主要参数对脱硫率的影响,以及加添加剂的效果。试验结果表明,通过合理的设计和适当的操作,可使钢渣湿法应用于中低脱硫率(50％～70％)的场合,以取得综合治理、以废治废的效果。     

Prenatal diagnosis,fetal pathology,and cytogenetic analysis of mosaic trisomy 14

While true mosaicism occurs in only 0–25 per cent of genetic amniocenteses, nearly 2–5 per cent of amniotic fluid cell cultures contain a second cell line. In the common practice of prenatal diagnosis, an aberrant cell line confined to a single colony is usually disregarded. We present a case of mosaic trisomy 14 which was not detected on initial chromosome analysis. At birth, multiple malformations were apparent. Newborn cytogenetic studies revealed mosaicism [46,XX/46,XX,-14,+i(14q)] with an isochromosome 14 in 37 per cent of lymphocytes. Additional cells from the initial amniotic fluid culture were analysed post-delivery and the isochromosome 14 identified in only one of 12 total colonies. This case illustrates two important lessons in prenatal diagnosis. First, amniotic fluid cell cultures may not accurately reflect the relative distribution of the normal and abnormal cell lines within a mosaic fetus. Second, while it is generally reasonable to disregard mosaicism confined to a single colony, this policy will, on rare occasion, result in diagnostic error. This should be taken into consideration, particularly when dealing with autosomal trisomies potentially compatible with livebirth.     

Normal development in two six-year-old boys born after prenatal diagnosis of trisomy 20 mosaicism

Prenatal diagnosis of trisomy 20 mosaicism was made in two pregnancies by chromosome analysis of cultured amniotic fluid cells. In both cases, the pregnancy continued to term and a healthy male infant was delivered. Regular assessments up to the age of 6-5 years revealed normal physical and intellectual development in both children.     

Environmental principles applicable to supply chains design and operation

In this paper we deal with the problem of identifying environmental principles for the design and operation of supply chains. The operations that are included in supply chains are briefly described along with the approaches that are applied in order to improve their environmental performance. A background of environmental principles for achieving eco-efficiency and building of environmentally friendly organizational systems is presented and emphasis is put on the application of such principles “from cradle to grave”. Then, environmental principles applicable to particular objects of logistics networks planning are identified and commented upon. In addition, selective case studies from the literature, which show the applicability of the formulated principles and their relevance to practice, are discussed. The paper concludes with some remarks regarding the benefits for companies and societies, in general, that occur as a result of the application of the formulated principles.     

江宁开发区污水处理厂二期调试运行

江宁开发区污水处理厂建设规模为4万m^3／d，分两期建成，采用氧化沟处理工艺，污泥处理采用不经消化的带式脱水工艺。在此主要叙述了各工艺构筑物的设备配置、功能、设计参数及二期工程的试运行情况。