Serum PAPP-A levels are depressed in women with fetal Down syndrome in early pregnancy

The value of maternal serum pregnancy-associated plasma protein (PAPP)-A in screening for Down syndrome in early pregnancy was assessed using stored samples. Seventeen cases of Down syndrome and 66 unaffected control pregnancies were studied. The median PAPP-A level in the cases was 0.42 multiples of the expected value in controls (p <0.0001). Eleven cases (65 per cent) had levels less than half the expected value compared with only six controls (9 per cent). A commercial assay kit is now needed so that prospective screening with this marker can begin.     

Biosorption of nickel(II) from aqueous solution by Aspergillus niger: Response surface methodology and isotherm study

In the present study, the effects of biosorbent Aspergillus niger dosage, initial solution pH and initial Ni(II) concentration on the uptake of Ni(II) by NaOH pretreated biomass of A. niger from aqueous solution were investigated. Batch experiments were carried out in order to model and optimize the biosorption process. The influence of three parameters on the uptake of Ni(II) was described using a response surface methodology (RSM) as well as Langmuir and Freundlich isotherm models. Optimum Ni(II) uptake of 4.82 mg Ni(II) g⁻¹ biomass (70.30%) was achieved at pH 6.25, biomass dosage of 2.98 g L⁻¹ and initial Ni(II) concentration of 30.00 mg L⁻¹ Ni(II). Langmuir and Freundlich were able to describe the biosorption isotherm fairly well. However, prediction of Ni(II) biosorption using Langmuir and Freundlich isotherms was relatively poor in comparison with RSM approaches. The biosorption mechanism was also investigated by using Fourier transfer infrared (FT-IR) analysis of untreated, NaOH pretreated, and Ni(II) loaded A. niger biomass.     

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。     

Prenatal exclusion of stickler syndrome

Stickler syndrome is an autosomal dominant disorder of the connective tissue which includes ocular and systemic manifestations. We report on a large kindred in which we were able to demonstrate very tight linkage between the disease and the type II collagen gene (COL2A1) (LOD score 3·91 at θ=0). In a family in which the father and one of his daughters were severely affected, DNA analysis from a chorionic villus sample demonstrated that the fetus possessed the normal allele of COL2A1. Thereafter a normal child was born.     

On the study of ecosystem health:state of the art

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Solid phase extraction of methomyl and thiodicarb from environmental water with an activated carbon cartridge and their determination by HPLC

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Petro-chemical wastewater treatment by biological process

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废渣──Al(OH)_3凝胶再利用研究

研究了对处理铝材加工含Al3＋的酸性废液过程中产生的二次污染物Al（OH）3凝胶废渣的应用。含水分约90％、80％左右的Al（OH）3凝胶200g分别与14～16mL、22～24mL95％的工业浓硫酸酸反应，可制得浓度为20％～23％的Al（SO4）3溶液，经稀释可用作造纸原料。     

美国环保产业发展政策对我国的启示

当今环保产业作为新兴战略产业在世界范围内迅速成长。美国作为全球环保产业的领头羊,其环保产业的发展离不开政府行之有效的发展政策。美国政府主要通过法律法规、税收、贷款、债券、基金、放宽出口管制、以外交促贸易等政策措施,促进了美国环保产业的技术创新、投融资及国际贸易。借鉴美国政策经验,我国应在环保产业管制政策、技术创新政策、财税政策、国际贸易政策上做出相应改进,以促进我国环保产业积极健康发展。     

用煤矸石合成4A沸石分子筛处理氨氮废水

以煤矸石为原料,采用碱熔-水热法合成4A沸石分子筛。由于煤矸石中铝、硅主要以高岭土形式存在,其活化过程是合成4A沸石分子筛关键环节。为提高4A沸石分子筛钙离子的交换能力,增加对模拟废水氨氮的去除率,实验考察了碳酸钠与煤矸石质量比、活化温度、活化时间、晶化温度和晶化时间对4A沸石分子筛钙离子交换能力的影响,同时也考察了模拟废水的pH、4A沸石分子筛加入量及吸附时间对氨氮去除率的影响。结果表明,最佳工艺条件为,碳酸钠与煤矸石质量比为0.9、活化温度为800℃、活化时间1.5 h、晶化温度90℃和晶化时间3 h。合成4A沸石分子筛的钙离子交换能力为310 mg/g,在pH为6的100 mL模拟氨氮废水中加入6 g 4A沸石分子筛吸附40 min后,废水中氨氮的去除率达到86%。通过最佳工艺条件合成4A沸石分子筛,在处理氨氮废水方面具有一定的应用前景。