Prenatal diagnosis of a familial complex chromosomal rearrangement involving chromosomes 5, 10, 16 and 18

We report one case of a familial complex chromosomal rearrangement (CCR) involving four different chromosomes 5, 10, 16 and 18. The CCR was detected prenatally at 20 weeks' gestation because of advanced maternal age and history of recurrent miscarriages. Cytogenetic analysis of cultured amniotic fluid cells with GTG banding showed a 46,XX,t(5;16;10;18)(q13;q22;q11.2;q21) karyotype. Parental cytogenetic study revealed that the mother has the same CCR. RBG banding, high-resolution banding and fluorescence in situ hybridization (FISH) were used to characterize further and confirm the conventional banding data. No physical abnormalities were shown in the targeted fetal ultrasonography examination. The parents decided to continue the pregnancy. The child is now 2 years old and has neither congenital anomalies nor evidence of delayed psychomotor development. The fetal targeted ultrasound and FISH analysis helped us reassure fetal status. Copyright © 2002 John Wiley & Sons, Ltd.     

三峡库区土地自然坡度和高程对经济发展的影响

坡度和高程是土地资源固有的二个重要环境因子 ,对土地利用和土地生产力有直接作用。在山区 ,坡度和高程基本上决定了土地利用方向和利用方式 ,从而影响到经济效益和发展潜力。三峡库区面积 6 2 6 4 0km2 ,为丘陵、低中山区 ,山高坡陡。按坡度和高程对农业生产的影响程度进行分级 :0～ 7°、7～ 15°、15～ 2 5°、>2 5° ;80 0m以下 ,80 0m以上。在编制的 1:10万土地自然坡度和高程分级图及土地利用图的基础上获取各坡度、高程级及其土地利用类型和数据。 4个坡度级土地面积随坡度的增加而加大 ,随海拔的增高而减小。耕地大部分集中在 80 0m以下 7～ 15°和 15～ 2 5°的坡度上 ,优质耕地少 ,中、低产地多 ,并存在大量的陡坡耕地。森林大多分布在 80 0m以上 >2 5°陡坡上。根据对 1980～ 1996年库区主要县、市农业年产值与自然坡度和高程的定量分析比较 ,可以看出它们之间存在着明显的反比例关系。综合提高库区土地生产力 ,必须遵循“有所为 ,有所不为”原则 ,进行农业结构调整 ,不片面强调增加粮食产量而盲目扩大耕地面积 ,大力改造 15～ 2 5°的中、低产地 ,有计划、按步骤并在尊重农民意愿的基础上进行退陡坡旱地还林 (草 ) ,改善生态环境。     

城市政府建立环境管理体系的绩效分析

从城市的可持续发展和建立循环经济社会框架的需求出发．阐述了城市政府建立环境管理体系的必要性和意义；并分别从构筑沟通、监督、服务、链接四大平台．提高政府对突发事故的应急能力。建立循环经济社会框架，提高招商引资的竞争力和培养全员环境保护意识从五个方面分析论证了建立环境管理体系可以取得的环境绩效，最终做到规范政府管理，实现环境与经济，社会的协调发展。     

“限塑令”的公众行为响应与白色污染控制对策——以咸宁市为例

以咸宁市消费者人群为研究对象,通过问卷调查统计并分析了消费者对政策（塑料购物袋收费）的行为响应。与此同时根据咸宁市统计年鉴和环境公报.统计估算了城市生活垃圾及白色污染的产生量及其变化趋势,研究结果表明：政府强制措施的出台限制了白色垃圾的产生量,但公众配合意愿尚不高。在此基础上,基于系统化原理,本研究提出了城市生活垃圾及白色污染治理的对策措施。     

间接原子吸收法测定水中硫化物

通过将水样酸化后转化成硫化氢,用氮气带出,被含有定量且过量的铜离子吸收液吸收。分离沉淀后,通过测定上清液中剩余的铜离子,对硫进行间接定量。方法检出限为0.2 mg·L^-1,对实际水样进行分析,加标回收率在90%～95%之间,结果令人满意。     

Effect of nutrient level on phytoplankton community structure in di erent water bodies

Increasing levels of pollution within water bodies can cause eutrophication and an associated rapid growth in and reproduction of phytoplankton. Although most frequently occurring in bodies of water such as lakes and dams, in recent years an increasing number of river systems in China have suffered serious algal blooms. The community structure of phytoplankton may differ, however, dependent on the hydrodynamic conditions and nutrient levels within the water body. The field investigation results obtained fro...     

Modeling the effects of constructed wetland on nonpoint source pollution control and reservoir water quality improvement

This article describes the integrated modeling approach for planning the size and the operation of constructed wetlands for maximizing retention of nonpoint source pollutant loads and reservoir water-quality improvement at a catchment scale.The experimental field-scale wetland systems (four sets,0.88 ha each) have been in operation since 2002,where water depth was maintained at 30–50 cm and hydraulic loading rate was at 6.3–18.8 cm/day.The wetland system was found to be adequate for treating polluted stream water with stable removal efficiency even during the winter.The integrated modeling system (modified-BASINS) was applied to the Seokmoon estuarine reservoir watershed and calibrated with monitoring data from constructed wetland,stream,and reservoir.The calibrated integrated modeling system estimated that constructing wetlands on 0.5% (about 114 ha) of the watershed area at the mouth of reservoir could reduce 11.61% and 13.49% of total external nitrogen and phosphorus loads,respectively.It also might improve the nitrogen and phosphorus concentration of the reservoir by 9.69% and 16.48%,respectively.The study suggested that about 0.1%–1.0% of the watershed area should be allocated for constructed wetland to meet specified water-quality standards for the estuarine reservoir at the polder area where land use planning is relatively less complicated.     

再看环保五年规划

<正>近40年来,中国环境保护规划(计划)伴随着环保事业的发展,经历了孕育起步、尝试、发展、完善提高、约束转变等五个阶段,逐渐成为传统八项环境制度的龙头。尤其是"十一五"期间,两项主要污染物减排指标作为约束性指标纳入国民经济与社会发展"十一五"规划,国家环境保护"十一五"规划首次由国务院     

隔油-共沉淀-Fenton预处理制药废水

采用隔油-共沉淀-Fenton法对含有大量的苯、甲苯、铝及苯甲酮的制药废水进行处理。经隔油处理,COD由147 490.8 mg/L降至139 518.4 mg/L,后通过调节pH值来去除大部分的铝离子,pH=7时效果最佳,COD大约降至10 000 mg/L。Fenton最佳氧化条件为:pH为7,H2O2的投加量为1.6 g/L,H2O2和Fe2+的投加量比为14,反应去除时间为5 h,在此条件下COD降为840 mg/L,去除效率为91.6%;Fenton氧化预处理后废水的可生化性也得到较大提高。