办公室空气颗粒物的粒度分布初探

用气溶胶自动分析仪对办公室内空气中的颗粒物进行了测定。测定结果表明：颗粒物的数量浓度、总表面积、质量浓度与颗粒物粒径在双对数坐标图上均呈直线关系，颗粒物浓度峰 粒径１￣２μｍ处。另外，吸烟对办公室内颗粒物的粒度分布影响较大。     

应对环境突发事故亟需日常风险管理--访清华大学公共管理学院、21世纪发展研究院常务副院长薛澜教授

一直以来，中国人就不太习惯或不敢用危机这样的词汇来讨论国家面临的种种挑战。其实即便从哲学角度来看，危机也未必完全是坏事，危机往往是生机、转机的开始，危机实际上起到了社会“安全阀”的作用，所谓“祸兮福之所倚，福兮祸之所伏”就是这个道理。 过去的20多年里，中国创造了一个经济持续高速发展的繁荣时期，但与此同时，各种社会问题也不断显现出来。此外，按照一般规律，当一个国家的经济发展到人均GDP达500美元至3000美元时。往往对应着人口、资源、环境、效率与公平等社会矛盾较为严重的瓶颈时期，此时比较容易造成社会失序、经济失调、贫富悬殊、心理失衡等问题，形成一些社会不稳定因素。目前，中国正处于经济转轨、社会转型的关键时期，同时也是危机事件的多发期。 古人说：“安而不忘危，治而不忘乱，存而不忘亡”，这也是中国历史上“治国安邦”的重要经验。因此，在中国社会上下努力、转变政府职能，彻底改变旧的行政管理体制和思维模式的情形下，借鉴其他国家的危机管理体系的实践经验，我们就能将环境突发事件防患于未然，并逐步形成环境危机管理的初步机制。[编者按]     

Detection of low-grade mosaicism in fetal cells isolated from maternal blood

Recovering and analysing fetal erythrocytes from maternal blood is being pursued for non-invasive prenatal genetic diagnosis. We report the observation of 46, XY/47, XXY mosaicism in fetal cells from a woman whose first-trimester chorionic villus sampling (CVS) initially showed only 46, XY. Only after exhaustive (500 cells) analysis were four XXY cells found in cultured villi.     

国际爱护动物基金会

国际爱护动物基金会（Internatlonal Fund for Animal Welfare,简称IFAW）创立于1 969年,是全球最大的动物福利组织之一,总部位于美国的马萨诸塞州.     

11种有机磷农药对海洋微藻致毒效应的研究

通过研究不同盐度条件下１１种有机磷农药对扁藻的相对增长率和叶绿素ａ含量的影响，得到了Ｓ＝３０和Ｓ＝２０时的半数有效浓度，并比较其大小。盐度作为环境因子，影响到有机磷农药的毒性。研究发现，遥有机磷农药在低浓度时出现一定限度的促生长作用；容易进攻细胞膜的有机磷农药对扁藻的致毒性相对较强；此外，有机磷农药的毒性大小与其结构密切相关含有苯环结构的有机磷农药毒性大小不含有苯 有机磷农药的毒性。     

The nature of the redshift and directly observed quasar statistics

The nature of the cosmic redshift is one of the most fundamental questions in modern science. Hubble's discovery of the apparent Expansion of the Universe is derived from observations on a small number of galaxies at very low redshifts. Today, quasar redshifts have a range more than 1000 times greater than those in Hubble's sample, and represent more than 100 times as many objects. A recent comprehensive compilation of published measurements provides the basis for a study indicating that quasar observations are not in good agreement with the original predictions of the Expanding Universe theory, but are well fit by the predictions of an alternative theory having fewer adjustable parameters.     

First-trimester prenatal diagnosis of severe alpha-thalassemia

By means of chorion biopsy together with restriction endonuclease analysis of fetal DNA, first trimester diagnoses were successfully made in 33 fetuses at risk for Bart's hydrops fetalis. Seven pregnancies with Hb H or hydrops fetalis were therapeutically terminated before 4 months of gestation. Of the 26 pregnancies intended to continue, 18 have come to term with normal deliveries; one with threatened abortion was terminated at the end of the first trimester and, seven are progresssing normally.     

炼油污水回用方案初探

针对污水处理场改造后的水质情况，结合现有闲置设备的状况，提出一套既符合现场实际又有针对性的污水回用处理方案。