Fetal urinary insulin-like growth factor I and binding protein 3 in bilateral obstructive uropathies

Fetal urinary concentrations of insulin-like growth factor I (UIGF-I) and binding protein 3 (UIGFBP-3) were determined in patients with prenatal diagnosis of bilateral obstructive uropathy. Patients were retrospectively assigned to three groups, on the basis of outcome: group 1, termination of pregnancies (n = 11) with sonographic evidence of severe oligohydramnios or renal dysplasia, confirmed at histological examination; group 2, patients (n = 10) with postnatal plasma creatinine > 50 μmol/1 at the age of 1 year (1 yr-pCreat); and group 3, patients (n = 16) with 1 yr-pCreat ≤ μmol/1. The results show a significant increase in UIGF-I and UIGFBP-3 in groups 1 (18 159 ± 9083 pg/ml; 2657 ± 669 ng/ml) and 2 (1574 ± 847 pg/ml; 176 ± 50 ng/ml) in comparison with group 3 (35 ± 6 pg/ml; 21 ± 2 ng/ml). UIGF-I and UIGFBP-3 were significantly correlated with postnatal plasma creatinine, and were both sensitive (90 per cent; 80 per cent) and specific (88 per cent; 88 per cent) for prediction of elevated 1 yr-pCreat (>50 μmol/1). Fetal urinary IGF-I and IGFBP-3 are increased in severe fetal bilateral obstructive uropathy, possibly reflecting tubular dysfunction or/and increased synthesis consequent upon fetal kidney injury. Their predictive value for postnatal renal function needs further assessment.     

环境因素对芦苇湿地CH4排放的影响

用封闭式箱法对辽河三角洲芦苇湿地温室气体CH4 排放进行了长期观测 .结果表明 ,CH4 排放有明显的季节变化规律 ,平均通量为 52 0 μg·m- 2 ·h- 1.土壤产CH4 活性主要发生在 0～ 5cm土层中 ,并随土层深度的增加而显著下降 .CH4 排放受环境因素影响很大 ,土壤氧化还原电位在 -1 1 0mV时就有CH4 排放 ,其排放量随氧化还原电位的下降而增加 .另外 ,随着淹水深度的增加 ,CH4 排放反而减少 .在测定期内 ,CH4 排放与温度呈明显的正相关 (R2 =0 1 96,n =2 1 ,P <0 .0 5) .     

基于VFP的冷冲模模架数据管理系统的实现

以VFP(Visual FoxPro5.0)为开发平台，自行开发了冷冲模模架数据管理系统。之中简要介绍了VFP的主要特点，重点阐述了面向对象模架数据管理系统实现的主要技术。     

厦门西港和九龙江口浮游植物生化组成及其环境因子效应

厦门西港和九龙江口浮游植物碳水化合物与光强、盐度和叶绿素ａ均显著正相关，蛋白质与光强有负相关关系，脂类受光强的影响较小，蛋白质与碳水化合物之比与氮磷比显正相关。１０月该海域浮游植物叶绿素ａ与生化组分含量都比４月高，与１０月海水温度和海面辐照度较高有关     

Comparison of UV-based advanced oxidation processes for the removal of different fractions of NOM from drinking water

This study examined the effectiveness for degradation of hydrophobic (HPO), transphilic (TPI) and hydrophilic (HPI) fractions of natural organic matter (NOM) during UV/H₂O₂, UV/TiO₂ and UV/K₂S₂O₈ (UV/PS) advanced oxidation processes (AOPs). The changing characteristics of NOM were evaluated by dissolved organic carbon (DOC), the specific UV absorbance (SUVA), trihalomethanes formation potential (THMFP), organic halogen adsorbable on activated carbon formation potential (AOXFP) and parallel factor analysis of excitation–emission matrices (PARAFAC-EEMs). In the three UV-based AOPs, HPI fraction with low molecular weight and aromaticity was more likely to degradate than HPO and TPI, and the removal efficiency of SUVA for HPO was much higher than TPI and HPI fraction. In terms of the specific THMFP of HPO, TPI and HPI, a reduction was achieved in the UV/H₂O₂ process, and the higest removal rate even reached to 83%. UV/TiO₂ and UV/PS processes can only decrease the specific THMFP of HPI. The specific AOXFP of HPO, TPI and HPI fractions were all able to be degraded by the three UV-based AOPs, and HPO content is more susceptible to decompose than TPI and HPI content. UV/H₂O₂ was found to be the most effective treatment for the removal of THMFP and AOXFP under given conditions. C1 (microbial or marine derived humic-like substances), C2 (terrestrially derived humic-like substances) and C3 (tryptophan-like proteins) fluorescent components of HPO fraction were fairly labile across the UV-based AOPs treatment. C3 of each fraction of NOM was the most resistant to degrade upon the UV-based AOPs. Results from this study may provide the prediction about the consequence of UV-based AOPs for the degradation of different fractions of NOM with varied characteristics.     

城市交通干线两侧机动车尾气污染状况分析

文中对PM10,SO2，NO2，CO四种污染因子，从时间、车流量、风力、气压、气温等方面进行影响分析，分析结果高浓度CO和NOx的污染出现在城市交通干道两侧和交通密集区域，上述四种污染园予在未来几年里仍然是环境空气中的主要污染物，危害城市人民正常生活的主要污染源，成为未来环境保护工作中的重点内容。     

南通市一次连续空气污染过程的气象特征分析

文章对2005年11月22日至12月2日南通市及邻近地区出现的大范围、长时间连续空气污染过程的天气形势和主要气象要素进行了分析。结果表明：大型稳定性高压伴随而来的稳定层结和小风速，导致大气污染物难于扩散，是这次空气污染过程的主要原因；弱冷空气无法改变大气稳定层结，难于结束空气污染状态；随着强冷空气到来，大气环流形势改变，空气质量改善。     

底泥盐分释放对北塘水库水质成化的影响

为研究南水北调通水后,水源改变及水库调度对底泥盐分释放的影响,2005年7月,取0～60cm深度的北塘水库原状底泥样品,在实验室内模拟分析不同底泥含盐量、不同蓄水水质及水位变动和扰动条件下底泥氯化物释放规律。结果表明,底泥中Cl~-含量为0.043%,释放强度为0.12g/m~2·d,Cl~-含量越高,释放强度越大。在底泥含盐量相同的条件下,蓄去离子水的底泥Cl~-释放强度是蓄水库水的1.87倍。扰动状态下,底泥中的Cl~-有5.0%～9.5%释放出来,高于静止状态的3.2%～5.6%。水库运行水位发生变化,将影响底泥盐分的释放。1.0m水深条件下Cl~-的释放量是1.5m水深的5.8倍。水库四周地下水中Cl~-浓度为8.0×10~3～4.2×10~4mg/L,远高于目前水库水的Cl~-浓度。因此,一定要避免水库在低于设计低水位和周边地下水水位的条件下运行,防止底泥盐分释放及地下水反向补给造成水库水质的成化。     

含半无限长裂纹压电材料的Ⅲ型强度因子

研究了含半无限长裂纹压电材料在平面内电场和反平面荷载作用下的问题 ,得到了满足拉普拉斯方程、裂纹面边界条件的位移函数解和电势函数解及电弹场的基本解 ,并得到了应力、应变、电位移强度因子和能量释放率。研究结果表明 ,在裂尖 ,电场强度没有奇异性 ,而应变、应力、电位移具有奇异性。     

人的安全性评价研究

随着人们对人在整个安全系统中的重要性认识的不断提高 ,如何对人的安全性进行科学的评价也就越来越显得重要。笔者在综合论述了目前我国对机车乘务人员、起重机械作业人员、驾驶员以及电力运行人员的安全性研究以及国外相关研究的基础上 ,提出了有关人的安全性评价的定义 ,并提出如何建立人的安全性评价体系以及对人的安全性评价的通用指标 ,探讨了在实际工作中如何运用上述指标去评价人的安全性。为人的安全性评价提供了一种有效的方法和新的研究思路