Antenatal diagnosis and palliative treatment of non-immune hydrops fetalis secondary to fetal parvovirus B19 infection

Hydrops fetalis was diagnosed at 22 weeks. An ultrasound examination demonstrated cardiomegaly and a fetal blood specimen obtained by cordocentesis revealed thrombocytopenia, anaemia, and neutropenia. Fetal paracentesis yielded straw-coloured fluid with electrolytes indicative of a transudate. Non-enveloped icosahedral viral particles approximately 23 mm in diameter were visualized in the ascitic fluid by electron microscopy. Immune electron microscopy confirmed human parvovirus B19. Direct fetal digitalization led to a reduction in umbilical artery resistance, a decline in the abdominal circumference from 20·3 to 17·8 cm, and resolution of the ascites within 72 h. Despite this dramatic response to therapy, fetal death occurred on day 5 of treatment. The initial maternal serum was positive for anti-B19 IgM and IgG antibodies. Electron microscopy of fetal cardiac tissue obtained post-mortem revealed intranuclear viral particles typical of B19, confirming the antenatal diagnosis of myocarditis. This case demonstrates that direct viral identification is applicable to prenatal diagnosis. To our knowledge, this is the first reported case of the antenatal diagnosis and palliative treatment of fetal viral infection.     

纳米复合GeO2/TiO2的制备及光催化性能研究

采用改进的Sol-gel方法,制备了一种新型的单分散椭球形微孔结构的纳米GeO2/TiO2复合光催化剂,并用TG-DTA、XRD、XPS、UV-vis、FT-IR、TEM、BET等手段进行了表征.以难生化降解的染料罗丹明B为目标降解物,采用HPLC测定不同光照时间下催化剂对染料降解的情况,考察了催化剂的光催化活性结果表明,改进的Sol-gel法制得的复合光催化剂具有明显的孔结构,而且比表面积大、粒径小、粒径分布窄、分散性好;与适量GeO2复合后能够有效提高TiO2纳米粒子的光催化活性;复合光催化剂的最佳制备条件为GeO2摩尔含量为0.1%,煅烧温度为400℃,所制得的GeO2/TiO2光催化活性比纯TiO2有显著提高.     

稳定土技术在土路扬尘治理中的应用及展望

综合分析了稳定土技术用于土路扬尘污染治理的各种方法。然后在此基础上对该课题的研究及其发展提出了有关看法和建议     

OH^—,CO3^2—和HCO3^—碱度测定中S^2—的掩蔽方法研究

用酸碱指示剂滴定法测定废水的中的OH－，CO3^2-,HCO3^-碱度时，S^2-对测定有干扰，此干扰可用H2O2掩蔽。     

过氧化氢存在下HCFC－22光解特性

模拟大气条件研究了ＨＣＦＣ－２２＋Ｈ２Ｏ２在有氧或无氧存在下用低压汞灯进行辐照，在２０ｍ的长光程池中用富里叶红外光仪测量其化学产物，结果表明在没有氧情况下产物为ＣＯＦ２、ＣＯ２、ＨＦ和ＨＣｌ；有氧存在时产物为ＣＯ２、Ｈ２Ｏ、ＨＦ和ＨＣｌ．从这些产物推出其可能的光解机理．     

Prenatal diagnosis of GM2-gangliosidosis B1 variant

Prenatal diagnosis in a pregnancy at risk for a juvenile B1 variant of GM₂-gangliosidosis was carried out. The biochemical study of the cultured amniocytes and the affected fetal brain is reported. The results obtained show that the sulphated artificial substrate can be used in the diagnosis of B1 variant, but not the neutral one. The accumulation of GM₂-ganglioside in the fetal brain of the B1 juvenile form and an infantile form of GM₂-gangliosidosis (0 variant) was compared.     

纳米TiO_2光催化降解酸性红B的实验研究

采用偶联剂法在聚丙烯多面球表面负载化纳米TiO2,在高压汞灯照射下,以酸性红B染料为研究对象,采用光催化氧化法进行降解处理;研究了溶液初始浓度、H2O2和Fe3+投加量、pH以及光照强度等因素对酸性红B染料降解效果的影响。     

基于C/S与B/S混合模式的大气污染监测系统设计

以C／S与B／S混合模式为基础的大气监测系统、既能充分发挥网络资源的便捷化，实现企业监测数据与管理系统的快速链接，又充分利用C／S模式的安全性能，以保证系统的安全性。因而此系统是当前的一种较新型的，功能较为强大的网络监测系统。     

MDEA水溶液膜法天然气脱硫的试验研究

以新配和含有一定H_2S的MDEA溶液为吸收液,以聚偏氟乙烯(PVDF)膜组件为接触器,通过对操作参数的调节和改变膜孔大小等方法对脱硫率和总传质系数进行研究。结果表明:气液压力差以及膜孔孔径的增加均有利于脱硫率和总传质系数的提升,即均有利于脱硫。降低进气流量和低气液比均对H_2S传质有积极作用。     

UV/H_2O_2对氯消毒副产物TCM、DCBM的去除影响因素研究

针对UV/H_2O_2对氯化消毒副产物三氯甲烷(TCM)和一溴二氯甲烷(DCBM)的去除效果及影响因素进行研究,结果表明UV/H_2O_2方法对TCM和DCBM去除效果的影响因素有过氧化氢(H_2O_2)投加量、紫外光照强度、反应p H值和反应物初始浓度。通过不同的反应条件得出:H_2O_2在一定投加量变化范围(10~35 mmol/L)内,随投加量的增加,TCM和DCBM的去除率均呈先上升后下降趋势,H_2O_2最佳投加量分别为25,20 mmol/L;增大紫外光照(UV)强度,TCM和DCBM的去除率均显著提高;随初始p H值的增大,去除率均呈先上升后下降趋势,p H值为7.0时,去除率达到最佳;TCM和DCBM反应初始浓度分别为150,160μg/L时,其去除率最高,在有效时间内去除率分别为95.88%、92.56%。