Prenatal diagnosis of a fetus with terminal deletion of chromosome 1 (q41)

Many authors have suggested that individuals affected by a terminal 1q deletion display a phenotypically definable and recognizable syndrome. In all of the 27 cases reported to date, the breakpoints were at band q42 or distally to it. To our knowledge, we report the first case of a terminal 1q41 deletion. Diagnosis was made prenatally by amniocentesis, following ultrasonographic diagnosis of omphalocele, cerebral ventriculomegaly, and increased nuchal fold thickness in a 19-week female fetus. Multiple facial and extremity features were consistent with the proposed distal 1q deletion syndrome; omphalocele, however, has not been reported previously. The absence of liver herniation into the omphalocele sac in this case supports the previously reported association of this finding with chromosomal anomalies.     

美国城市生活垃圾处理的借鉴

近十年来．美国垃圾产量一直在稳步增长，垃圾回收率增幅较大，垃圾填理率趋于稳定．垃圾焚烧率已呈下降趋势。美国政府从70年代初开始以立法的形式来解决垃圾处理问题，在制订全面的垃圾管理法律的基础上，实现从垃圾产生的源头削减到垃圾最终处理的减量化，最终减少垃圾对环境的危害。经过几十年的发展和变革，形成了一套比较完善和行之有效的垃圾处理管理体系，在垃圾的管理上取得了十分明显的效果，值得各国借鉴。     

国外感染性废弃物的管理

感染性废气物对人们的身心健康有极大的威胁．然而从目前的实际情况来看，相当一部分是与一般城市生活垃圾混合在一起处理的情况较常见。鉴于上述情况．文中将欧美日发达国家对感染性废气物的收集．管理及处理情况给予介绍。     

掺杂改性纳米二氧化钛粒子光催化降解甲苯的研究

通过共沉淀法制备了掺铁纳米TiO2粒子，并用掺铁后的纳米TiO2粒子作为催化剂，对气相甲苯进行光催化降解实验。利用色谱、质谱、红外等测试方法研究了掺铁浓度对TiO2光催化性能的影响，同时探讨了光催化降解甲苯的机理。     

德国《环境责任法》的基本内容和特色介评

简要论述了德国《环境责任法》的主要内容和特色 ,包括因果关系推定、无过失责任原则、受害人的咨询请求权制度以及责任保险、财务担保制度等。     

Fluid Mechanics of Biological Surfaces and their Technological Application

 A survey is given on fluid-dynamic effects caused by the structure and properties of biological surfaces. It is demonstrated that the results of investigations aiming at technological applications can also provide insights into biophysical phenomena. Techniques are described both for reducing wall shear stresses and for controlling boundary-layer separation. (a) Wall shear stress reduction was investigated experimentally for various riblet surfaces including a shark skin replica. The latter consists of 800 plastic model scales with compliant anchoring. Hairy surfaces are also considered, and surfaces in which the no-slip condition is modified. Self-cleaning surfaces such as that of lotus leaves represent an interesting option to avoid fluid-dynamic deterioration by the agglomeration of dirt. An example of technological implementation is discussed for riblets in long-range commercial aircraft. (b) Separation control is also an important issue in biology. After a few brief comments on vortex generators, the mechanism of separation control by bird feathers is described in detail. Self-activated movable flaps (=artificial bird feathers) represent a high-lift system enhancing the maximum lift of airfoils by about 20%. This is achieved without perceivable deleterious effects under cruise conditions. Finally, flight experiments on an aircraft with laminar wing and movable flaps are presented.     

WTO:中国环境立法挑战与整合

探讨了我国“入世”后环境立法所面对的挑战问题。分析了世贸组织法中的环保条款及中国环境立法不完善之处，指出这将对中国“入世”后对外贸易产生不利影响。对完善中国环境立法提出建议。     

沸腾炉底灰的特性研究

用化学分析、Ｘ射线能谱、扫描电子显微镜、偏光显微、激光粒度分析仪等仪器地沸腾炉燃烧所产生的底灰的化学成分、颗粒形貌、粒度、物理性质和工艺性质等系统的分析，并一全国电厂煤粉炉产煤灰的特性进行了对比，结果表明，沸腾炉产底灰具有形态不规则、矿物相中无莫来石矿物、未燃烬炭量低、细底低、比表面积小、火山炭活性高等特点，为沸腾炉底灰的加工利用提供了重要的科学依据。     

取代苯类化合物的二维息定量结构-活性相关研究

为了预测非反应性麻醉型化合物对发光菌的发光半抑制浓度,评价该类化合物的毒性效应,采用独特的二维HQSAR分析方法,根据分子碎片的类型,将分子结构转变成具有特征的分子指纹,并用数字进行标记。这些标记出的数字作为QSAR的描述符,经过偏最小二乘法计算,建立起化合物结构与生物毒性之间的相关关系,由此所获得的HQSAR预测值与实测值之间也存在较好的相关性,即-1g_(pre)EC_(50)=0.311 0.929(-1g_(exp)EC_(50))(n=13,r=0.964)。这一模型的预测效果明显优于传统的二维QSAR模型,其结果可以为定量评估同类化合物的生物毒性提供可靠依据。     

甲基汞神经毒性检测和评价效应指标--即刻早期基因研究

论述了甲基汞神经毒性研究现状，通过分析即刻早期基因（IEG）在甲基汞神经毒性机制中的作用，得出即刻早期基因能作为甲基汞神经毒性检测和评价的效应指标，同时也简要介绍即刻早期基因的研究方法，并指出利用基因芯片技术能够被步筛选出甲基汞对大鼠脑基因表达影响的相关基因。