GY-IB光纤液位计试验与应用

叙述了GY-IB光纤液位计的工作原理,介绍了人工检测和计量测试研究所的测试情况,分析了该光纤液位计存在的不足和推广应用前景.     

Demonstration of spontaneously dividing male fetal cells in maternal blood by negative magnetic cell sorting and fish

We investigated a case of massive feto-maternal bleeding by using negative magnetic cell sorting (MACS) and fluorescent in situ hybridization (FISH). A 37-year-old pregnant woman had an uncomplicated amniocentesis for advanced maternal age at 16 weeks' gestation. The fetal karyotype was 46, XY. At 19 weeks' gestation, she had a minor car accident and slight vaginal bleeding. A subsequent Kleihauer-Betke test showed a 140 ml feto-maternal haemorrhage. Serial sonographic examinations indicated a normal fetus and placenta. We performed FISH analysis on maternal peripheral blood at 25 weeks. Anti-CD45 and MACS were used to deplete maternal leucocytes, enriching the proportion of fetal nucleated erythrocytes present. The isolated cells were analysed by using dual-colour FISH with X and Y specific probes. Approximately 65 800 nucleated cells were obtained after MACS depletion. A total of 234 cells were analysed by FISH. The results revealed that 70 of the nucleated cells (30 per cent) were male with one X and one Y signal. Among these cells, six male metaphases were observed in spontaneously dividing cells.     

新疆核试验场周围地区主要食品中90Sr(锶)、137Cs(铯)水平及其所致居民剂量

本文报道了新疆核试验场周围地区9个调查区17种主要食品中⁹⁰Sr、¹³⁷Cs含量分别为1.1~72.3,0.3~40.7×10^-2Bq·Kg^-1;3个对照区分别为1.6~68.4,0.6~27.4×10^-2Bq·Kg^-1。两地区同类食品中⁹⁰Sr、¹³⁷Cs平均含量基本一致。调查区⁹⁰Sr、¹³⁷Cs所致成年居民有效剂量当量值分别为2μSV(集体剂量当量为30.0人· SV);0.3μSV(4.5人· SV)。对照区分别为2.2μSV(集体剂量当量为20.9人·SV);0.4μSV(3.0人·SV)。可见我国核试验产生的⁹⁰Sr、¹³⁷Cs对核试验场周围地区食品没有造成明显的局部污染,所致居民剂量当量负担仅为我国天然外照射所致年有效剂量当量(952μSV)的0.2%和0.03%。对该地区的广大居民健康不会产生有害的影响。     

城市生活垃圾场垂直防渗技术应用与认识

为防止生活垃圾场渗滤液扩散 ,造成二次污染 ,本文着重论述了采用帷幕注浆进行垂直防渗的可行性 ,并结合工程实践 ,对生活垃圾场场址选择、帷幕注浆材料使用以及防渗工程布置作了分析和探讨。     

坩埚炉二次熔炼铜、铅、铝烟气中粉尘及其主要金属的排放系数

本文阐述了铜、铅、铝三种金属二次熔炼中埃埚法溶炼过程的烟气排放系数的研究与测试方法,提出了用埃埚炉熔炼不同铜、铅、铝原料时排烟中粉尘和主要金属的排放系数及粉尘的粒度分布数据,并对采样方法的可靠性及结果误差的摈除方法作了讨论.     

Prenatal diagnosis of tetrasomy 12p by in situ hybridization: Varying levels of mosaicism in different fetal tissues

Prenatal diagnosis of tetrasomy 12p is complicated by the discrimination of the 12p isochromosome from the duplication 21q as well as the level of mosaicism demonstrated in the particular tissue sampled. In this disease, a high percentage of chromosomally abnormal cells are generally found in fibroblastic cells, but lymphocyte karyotypes from the same individual may be normal. We report on the pregnancy of a 37-year-old female who presented to our centre at 16 weeks' gestation for genetic amniocentesis. Sonography of the fetus revealed dextrocardia and diaphragmatic hernia. Chromosome analysis of amniocytes demonstrated mosaicism of a 47,XY,+i(12p) line in 80 per cent of cells and a normal male line (20 per cent), consistent with the Pallister-Killian syndrome. Following termination, a 220 g male fetus of 18 weeks was examined. A flattened nose and low-set ears were noted. In situ hybridization with a chromosome 12 centromeric probe in lymphocytes and skin cells unequivocally confirmed the karyotype and showed the presence of a single centromere in the abnormal chromosome, suggesting a true isochromosome. Chromosome analysis of various fetal tissues was performed and the following percentages of abnormal cells were found: skin 100 per cent, chorion 50 per cent, placenta 30 per cent, and blood 80 per cent. The high frequency of tetrasomic cells in fetal blood at this early gestational age is noteworthy, since most reports of this syndrome show a very low percentage of abnormal cells postnatally.     

高效液相色谱法测定多环芳烃化合物辛醇/水的分配系数及其对水溶解度的估算

本文采用反相高效液相色谱法间接测定了29种多环芳烃化合物的辛醇/水分配系数,并估算其水溶解度,所得结果与文献值和计算值基本一致。     

室内微污染有机废气的纳米光催化处理

室内装修产生的污染严重影响人们的身体健康，纳米和光催化技术是国际上新出现并普遍认为是最有应用化前景的高新技术，介绍了应用TiO2纳米光催化技术治理室内空气污染的方法，能在常温下高效、稳定地分解污染物，其处理效果明显，无二次污染，适合室内空气中有害污染物净化。     

乳浊液膜处理含酚废水

本文报道了一种用于分离废水中苯酚的新液膜体系。该体系是以TBP为流动载体，以LMS-2为表面活性剂组成的煤油液膜，在内外相OH-浓度梯度的推动下．苯酚由外相有效地向内相富集，从而达到分离苯酚的目的。该液膜与其它液膜相比，具有稳定性好，选择性高等优点，用此液膜分离苯酚，除酚率可达99％以上。     

苏州河底泥中污染物分布特征及相关性

通过对苏州河市区段底泥的分析测定与研究，揭示了涉是金属，耗氧有机物，无机有害非金属和有毒有害有机物的若干相关性，以及它们的含量在各断面，统一断面的各深度和不同点位之间的分布的共同特征和规律性。