Nitrogen, phosphorus and potassium recycling in an agroforestry ecosystem of Huanghuaihai Plain: with Paulownia elongata intercropped wheat and maize as an example

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First-trimester prenatal diagnosis of spinal muscular atrophy using microsatellite markers

Twenty-five pregnancies at risk for spinal muscular atrophy I (SMA I) have been monitored by first-trimester prenatal diagnosis. Microsatellite markers were used in all cases to amplify polymorphic regions at the D5S125, D5S435, D5S39, D5S127, and D5S112 loci. All families, including 12 SMA I pedigrees with a deceased index child, were fully informative for DNA analysis. Three fetuses were predicted to be affected and 22 fetuses were predicted to be unaffected. Twenty-two newborns were unaffected by clinical examination at birth. These results support the accuracy of SMA I prenatal diagnosis based on linkage analysis.     

氮氧化物污染防治技术进展

氮氧化物 (NOx)是主要的大气污染物之一 ,NOx的治理历来受到国内外研究人员的重视。本文扼要介绍了国内外近 1 0几年来 NOx防治技术的研究进展     

新型文氏除尘脱硫洗涤器的研究

新型文氏除尘脱硫洗涤器是一种复合净化机理的燃煤烟气除尘脱硫一体化设备 ,其特点是体积小、阻力低、除尘脱硫效率高。实验研究和工业试验表明 :该洗涤器可使燃煤烟气二氧化硫和烟尘浓度达标排放     

一体式膜生物反应器运行参数间运动力学分析

运用气、液、固三相流运动力学原理对一体式膜生物反应器运行过程分析,得出:①反应器内错流流速与曝气量、反应器设计高度、主副腔的过流面积的关系.曝气量越大、反应器主腔高度越高、主腔的过流面积越小、副腔过流面积越大,反应器内错流流速越大;②膜抽吸压力与反应器内膜污染错流临界流速及主腔宽度的关系.减小管膜的抽吸压力,减小主腔的宽度,可减小膜面不淤临界流速;③膜管内污染的临界速度与膜管径、污染物与膜壁吸引力关系,消除膜污染的运行控制条件.     

不同测试工况下在用车排放特性对比研究

通过试验方法对在用汽油车在稳态ASM工况、IG195瞬态工况下的排放特性进行研究，并与怠速／双怠速工况下的排放测试结果进行比较，分析车龄与排放、发动机燃油供给方式与排放的关系，以及探讨排放因子与车龄的关系。     

城市污水生物脱氮除磷工艺研究进展

本文阐述了城市污水生物脱氮除磷工艺的发展过程,系统介绍了国内外各种污水生物脱氮除磷工艺,并对其进行了比较分析,对今后的发展趋势作了展望.     

固定化微生物脱氮

应用固定化微生物技术开展单级生物脱氮的研究。结果表明，固定化硝化与反硝化混合污泥可以实现单级生物脱氮，效果好于未固定化污泥，氨氧化速率和总无机氮的脱中分别提高到未固定化污泥的１．７倍和１３．４倍。结果还表明光硬化树脂也是一种较好的固定化介质。     

燃煤电厂的除尘、脱硫、脱硝技术

综述了国内外燃煤电厂除尘、脱硫、脱硝技术与设备,及其我国的发展趋势。     

A new RFLP marker,SP282, at the btk locus for genetic analysis in X-linked agammaglobulinaemia families

X-linked agammaglobulinaemia is an inherited recessive disease in which the primary defect lies in the failure of pre-B cells to develop into mature circulating B cells, due to a defective B-cell cytoplasmic tyrosine kinase (btk). For this study we introduced a new RFLP marker, SP282, which is tightly linked to the XLA locus. In conjunction with the marker DXS178, SP282 was used to identify a carrier female and predict her male offspring to be normal. Subsequently the fetus was shown to have a normal number of circulating B cells, and at 2·5 years of age, the non-affected phenotype of the child was confirmed.