The safety of fetoscopy: (I). Effect of umbilical vessel puncture on the fetal heart rate and cord histology

The fetal heart rate (FHR) was continuously monitored during 42 umbilical vessel punctures performed at the placental insertion of the cord in 24 diagnostic fetoscopies in which pure fetal blood was obtained. In only one patient did a deceleration first appear during puncture and aspiration of fetal blood. In two patients decelerations preceded fetoscopy and in two others they began during the fetoscopy but before puncture of an umbilical vessel. In 19 patients, the FHR did not change at all during the procedure. Fetal haemorrhage after sampling was either absent or minimal. Six pregnancies were terminated because a positive diagnosis had been made and 18 healthy babies were born. Umbilical cords were examined after 7 terminations of pregnancy and after 6 deliveries. In the former group the puncture could just be seen with the naked eye and the needle track was demonstrated histologically in 6. No traces of the puncture or other abnormalities were found in the cords after delivery. Fetal blood sampling from umbilical cord vessels, particularly at the placental insertion of the cord, is the technique of choice since pure fetal blood can be obtained without increasing the risk of fetoscopy.     

Intra-specific variations of two Leymus chinensis divergence populations in Songnen Plain, northeast China

Population demography, seed production, biomassallocation, net photosynthesis and transpiration of two Leymus chinensis divergence populations and between two years in Songnenplain, northeast China were compared. Strong differences betweenthe dry 1997 and moist 1998 occurred in vegetative shoot and sexualshoot densities, sexual differentiation and tiller densities, aswell as in the lengths of inflorescence, seed numbers perinflorescence, seed weights and biomass allocation in eachpopulation respectively (P<0.01). While strong differences betweenthe two populations occurred in vegetative shoot densities, sexualshoot densities, sexual differentiation and seed weights in eachyear (P<0.01). The differences between the two populations intiller densities and in biomass allocation to sexual shoots were significant (P<0.05). But there were no significant differences between the two populations in the lengths of inflorescence, seed numbers per inflorescence and biomass allocation to rhizomes and vegetative shoots (P>0.05). Excepting the transpiration rate in the early June, the differences between the two populations in net photosynthesis and transpiration rate of vegetative shoots and sexual shoots were strongly significant in the early June and July respectively (P<0.01). Relative stable variations in population demography and physiological traits between the two populations indicated that they are divergently in the Songnen Plain.     

草浆造纸中段废水的生物处理动力学

利用静态溶解氧消耗速率（OUR）试验模拟草浆造纸中段废水生物处理的生化反应过程,并运用Lawrence-McCarty模式进行了动力学分析。由OUR试验结果和小试研究结果建立的草浆造纸中段废水好氧生物处理的动力学方程为v=0.72S/(60.43 S）。将该动力学方程预测结果和实际工程的运行数据进行了比较,结果表明,动力学方程的比基质降解速率预测值高于实际工程的计算值,分析原因可能在于：实际工程中中段废水中的纤维素类悬溪物在生物处理装置的积累导致了污泥活性的降低。     

废干电池浸出的试验研究

以锌碳电池和碱性锌锰电池为实验对象，通过固体废物浸出毒性试验，探讨废电池在不同破坏程度、不同pH值和不同浸取级数条件下的浸出规律。试验发现，锌碳电池中Pb、Cd、zn、Mn浸出浓度相对较高，碱性锌锰电池中Cu、As、Hg浸出浓度较高。对于锌碳电池，中性浸取剂和酸性浸聚剂影响不大，而对于碱性锌锰电池，酸性浸取剂条件下浸浓度反而较低。锌碳电池和碱性锌锰电池都是在完全破坏条件下浸出浓度高。在实际中，电池外壳腐蚀是一个缓慢的过程。     

水面溢油集油剂研究--天然混合羧酸系列集油剂

利用天然混合羧酸与聚氧丙烯醚以适当比例混合，以乙醇为溶剂制得新型集油剂，燃点８８．７℃，对于柴油、原油膜有优良的集油性能。ＱＳ＝１集油剂在５５ｃｍ长的水槽中，使水面柴油膜收缩距离达４４．０～５０．８ｃｍ，维持时间大于６ｈ；ＱＳ－２集油剂使原油膜面积收缩率７４．３％～７６．５％，维持时间大于１６ｈ。该集油剂在０～４０００ｍｇ／ｄｍ＾３浓度下，不影响小球藻和小新月菱形藻生长。该集油剂在４级海况条件下仍     

西湖底泥不同供氧条件下有机质降解及CO2与CH4释放速率的模拟研究

采用密闭培养实验装置于室温（２５℃左右）及ｐＨ为７５条件下，对西湖底泥中有机质完全降解及转化为ＣＯ２和ＣＨ４的速率进行了模拟研究．结果表明，在西湖湖水现有供氧水平（５０—８６ｍｇ（Ｏ２）／Ｌ）条件下，底泥中有机质完全降解的速率最为缓慢，培养期间（４２天）平均只有０７２ｍｇ（Ｃ）／（ｋｇ·ｄ）．当湖水供氧水平进一步上升（８６→１２０→１６０ｍｇ（Ｏ２）／Ｌ），ＣＯ２释放速率增加，最大值可达到８７ｍｇ（Ｃ）／（ｋｇ·周）；当湖水供氧水平下降（８６→０ｍｇ（Ｏ２）／Ｌ），ＣＨ４释放速率加快，最大值可达到４６ｍｇ（Ｃ）／（ｋｇ·周）．     

Mechanisms of granular activated carbon anaerobic fluidized-bed process for treating phenols wastewater

ＩｎｔｒｏｄｕｃｔｉｏｎＢｅｆｏｒｅｔｈｅ 1 980ｓｃｏｎｖｅｎｔｉｏｎａｌｔｒｅａｔｍｅｎｔｐｒｏｃｅｓｓｅｓｏｆｐｈｅｎｏｌｓｗａｓｔｅｗａｔｅｒａｒｅｓｏｌｖｅｎｔｅｘｔｒａｃｔｉｏｎ ,ｐｈｙｓｉｃａｌａｄｓｏｒｐｔｉｏｎ ,ｃｈｅｍｉｃａｌｏｘｉｄａｔｉｏｎａｎｄａｅｒｏｂｉｃｂｉｏｌｏｇｉｃａｌｐｒｏｃｅｓｓ.Ａｍｏｎｇｔｈｅｂｉｏｌｏｇｉｃａｌｕｎｉｔｐｒｏｃｅｓｓｅｓａｃｔｉｖａｔｅｄｓｌｕｄｇｅｐｒｏｃｅｓｓｉｓｍａｉｎｏｎｅ.Ａｆｔｅｒｔｈｅ 1 980ｓａｎａｅｒｏｂｉｃｂｉｏｌｏｇｉｃ…     

马铃薯淀粉废水的碱式聚合氧化铝处理

本文介绍了用碱式聚合氯化铝处理高浓度有机淀粉废水的效果。用实验室配制的CODw浓度为10000－15000mg/L的淀粉废水以不同用量的碱式聚合氯化铝为絮凝剂处理后，CODw去除率达到28％－47％，再经吸附柱吸附后，CODw去除率可达到65％。     

物化—生化组合工艺在鱼油工业废水处理中的应用

针对鱼油工业废水排放特点及处理技术难点，结合实例，采用混凝、破乳进行物化预处理；采用A／O生化处理技术，提出合适的工艺流程。     

红外分光光度法测定石油类和动植物油

油是污染物达标排放总量控制项目之一，红外分光光度法较重量法、荧光分光光度法、紫外分光光度法测量油准确、可比，且标准油易制备。利用红外分光测油仪，严格控制空白值，做空白试验，能准确、快速的测定水中的石油类和动植物油。