First trimester diagnosis of β-thalassaemia in a twin pregnancy

This paper reports the results of first trimester prenatal diagnosis in a twin pregnancy at risk for homozygous β°−thalassaemia (β°−39 mutant). Trophoblast samples from both twins were obtained at 10 weeks gestation with a forceps guided by ultrasound. Trophoblast DNA analysis, carried out with the oligonucleotide technique, revealed that one fetus was homozygous and the other heterozygous for the β−39 mutant. This diagnosis was confirmed at 17 weeks gestation by amniocyte DNA analysis. DNA polymorphism analysis within the α-globin gene provided useful genetic markers for twin differentiation.     

桂林酸雨中不可溶成份的电镜分析

对广西省桂林市１９８８－０３－１６－１９８８－０３－２９出现的四次系统酸性降水，进行了降水的连续联样和过滤，用电子显微镜观测降水中的不可溶成分，共得到了１２种元素，即Ａｒ，Ｍｇ，Ａｌ，Ｓｉ，Ｐ，Ｓ，Ｃｌ，Ｋ，Ｃａ，Ｆｅ，Ｎｉ和Ｃｒ。用平均值法和聚类法，分析了桂林酸雨中１２种不可溶元素的重量谱特征，以及它们与降水系统之间的关系。     

膨胀石墨吸附材料在环境保护中的应用

介绍了膨胀石墨吸附材料的特点、结合国内外研究资料和我们对膨胀石墨吸附性能的研究，重点分析了这种新型吸附材料在环境保护中的各种用途     

伊春河流域土壤与沉积物中水溶性有机物的含量与吸着系数

利用改变水土比的动态方法测定了采自伊春河流域土壤和沉积样品中水溶性有机物的含量与吸着系数;比较了不同样品间的差异及影响水溶性有机物含量和吸着系数的因素。研究结果表明,草甸沼泽土中水溶性有机物含量最高,沉积物中含量最低。水溶性有机物的吸着系数也呈同样的递变趋势。     

Emission of landfill gas in Qingdao, China

ＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅｓ，Ｂｅｉｊｉｎｇ１０００１２，Ｃｈｉｎａ）Ａｂｓｔｒａｃｔ：ＡｓｔｕｄｙｏｎｌａｎｄｆｉｌｌｇａｓｅｍｉｓｓｉｏｎｉｎＱｉｎｇｄａｏ，Ｃｈｉｎａｗａｓｃａｒｒｉｅｄｏｕｔ．Ｔｈｅｒｅｓｕｌｔｓｓｈｏｗｅｄｔｈ...     

厌氧折流反应器对硝基苯冲击负荷适应性的研究

在9L、4格室的厌氧折流反应器（ABR）中,处理以葡萄糖为共基质的含硝基苯废水,温度为5～10℃,进水COD浓度为200-400mg／L,HRT为3h。结果表明ABR对有毒废水浓度变化的适应能力强,当进水硝基苯的浓度为0．48mg／L时,出水COD在21天恢复正常,运行稳定,反应器经硝基苯连续3天冲击（0．48mg／L）后,经历了原有微生物死亡、新微生物生长直到最终项级群落和稳定发酵类型的形成的过程。     

浅析喀斯特生态系统健康影响因子及评价指标——以毕节地区为例

从喀斯特生态系统以及喀斯特生态系统健康评价的概念出发,以毕节地区为例,分析了影响喀斯特生态系统健康的各类因子,如水土流失及石漠化、水资源、生物多样性、地貌、人类活动强度与方式、人-社会-生态健康可持续性等,利用因子载荷分析方法,从生态系统的结构功能、可持续利用能力、动态变化等三个方面筛选出26个因子构建了喀斯特生态系统健康评价的指标体系。     

Stability of alpine timberline ecotone on Taibai Mountain,China

--Landscape boundaries are always indicated by thevegetation boundaries. As an ecotone between closed forest andtreeline, alpine timberline may respond to global climate changessensitively. The stability of timberline and treeline depend notonly on climate change, but also on the interaction of both sidesof the ecosystems. Three natural boundaries existing in thetimberline transitional zone are recognized (1) timberline (upperlimit of closed forest zone); (2) treeline (upper limit of treeislands zone); (3) tree-species line (upper limit of individualtree growth). Paleobotanical and sedimentary evidences suggest thatthere were several times of climate fluctuation during the Holoceneperiod in this area. The timberline of Taibai Mountain must havemoved for four times on the millennium scale. Being a stochasticoscillation boundary, treeline appears in a semi-stable conditionon the century scale. The tree-species line is even more unstable,which appears in an unstable status on the decades scale. Thecomparison of the stability within several landscape boundaries,shed light on the sensibility of these communities to variousperturbation and environmental heterogeneity, i.e., herb community is the most sensitive one, which is followed by shrubs, and forestis the most stable one. Trees and shrubs can adapt to rocky andpoor soils. On the contrary, alpine herbs are able to adapt towetter and cooler soils. Finally, under a scenario of a temperatureof 1.5-4.5℃ increase, the present timberline will be relativelystable but treeline and tree-species line will move upward.     

静电除尘净化球团竖炉烟气技术研究

介绍了球团坚炉的烟尘排放特性,分析研究了影响静电除尘器工作性能的主要因素,总结了静电除尘改造工程中技术改进经验和运行管理所取得的经验。     

应用UBET模拟环形件金属流动及毛坯尺寸优化

利用上限单元法(UBET)数值模拟了自行车飞轮外壳的成形过程.优化出模锻自行车飞轮外壳的圆环毛坯尺寸.研究了环形件金属的流动规律和过程.并且用实验验证优化出的毛坯尺寸.试验结果与优化结果基本吻合.