原花青素对镉引起的鸡胚睾丸氧化损伤的缓解作用

为探索原花青素对镉引起的鸡胚睾丸氧化损伤的缓解作用,本实验设置了对照组、镉、葡萄籽提取物原花青素(grape seed proanthocyanidin extract,GSPE)和镉+GSPE组,在胚胎期第6.5天(E6.5)注射0.05 mg·kg-1镉或2.5 mg·kg-1GSPE,统计孵化率和睾丸指数,并在E17.5检测睾丸形态、氧化指标、细胞凋亡和内质网应激相关基因的表达情况。结果表明:与对照组相比,镉处理组孵化率和睾丸指数均显著降低;睾丸组织结构出现了细胞核固缩、空泡化和染色质周缘化等变化,过氧化氢和丙二醛水平升高、超氧化物歧化酶活性显著降低、谷胱甘肽含量明显减少,凋亡细胞显著增多;睾丸中抗凋亡基因Bcl-2 mRNA表达水平下降,同时促凋亡基因Caspase3和内质网应激相关基因(XBP-1和HO-1)mRNA表达水平显著上升。然而,GSPE联合处理,明显缓解了镉引起的睾丸损伤,使孵化率和睾丸指数回升,抗氧化水平和内质网应激得到改善,凋亡细胞显著减少,睾丸形态趋于正常。结果表明:GSPE可通过其抗氧化作用降低XBP-1相关的内质网应激基因的表达,从而缓解镉引起的鸡胚睾丸生殖毒性。     

Identifying watershed-scale spatiotemporal groundwater and surface water mixing function in the Yiluo River,Middle of China

Environmental Science and Pollution Research - Researching the watershed-scale spatiotemporal groundwater and surface water mixing function, groundwater recharge heights and age can provide...     

我国政府购买环境公共服务的监督机制研究

近年来,环境类服务购买在政府购买公共服务中的比重不断增多,作为政府购买公共服务的下属概念,其监督不仅存在政府购买公共服务监督的一般性问题,还存在环境领域的专门问题,概括后主要表现为监督主体缺位、被监督对象比例设置不科学、监督内容过于宽泛、监督制度构建有限等。推动全国性专门立法、定位不同监督主体的功能、明确以"合同"为核心的监督内容、拓展配套制度是完善我国政府购买环境公共服务监督机制的必由之路。     

The evolution of CO<Subscript>2</Subscript> emissions in international trade for major economies: a perspective from the global supply chain

Employing global multi-regional input–output models, this paper revisits the carbon dioxide (CO₂) emission trade (including exports and imports) and assesses their positions in the national emissions of 14 major countries with large national emissions or large emission trades during 1995–2009. It especially explores the evolution of the emission trades of these countries from both continuous time series and comparative perspectives, in order to provide an explanation for CO₂ emission spillovers across countries. The main findings obtained were as follows: (1) China was the largest CO₂ exporter to other countries, accounting for over 20 % of global exports since 2005; the CO₂ exports of the United States of America (USA), Germany, and Japan varied slightly over this time period, but overall, their proportions had decreased. (2) The CO₂ imports of the USA were the largest, occupying around 20 % of the global CO₂ imports; meanwhile, China’s CO₂ imports increased rapidly and ranked the second largest. (3) For Chinese Taiwan, its proportion of CO₂ exports in production-based emissions ranked the highest while that of the USA ranked the lowest; highly CO₂ import-dependent countries with an over 40 % proportion of CO₂ imports in its consumption-based emissions included France, Germany, Italy, and Spain, while China, India, and Russia remained the lowest, distinguished from their physical energy imports. These results suggested that the global policy makers should take the CO₂ emissions in trade into consideration when carefully accounting for national emissions inventories.     

攀钢二期工程除尘器评价

通过对攀钢(集团)公司二期工程上马的5种类型除尘器性能进行监测评价，重点对除尘器除尘效率和处理风量的实测值与设计值相比较，调查监测结果表明：电除尘器、水膜除尘器、大型布袋除尘器和旋风多管除尘器性能良好；小型布袋除尘器运行情况良莠不齐，泡沫除尘器运行情况差。针对其使用现状提出相应的建议。     

Study of the Optimization and Adjustment ofthe IndustrialStructure Subjected to Water Resource in the Drainage Area of the Yellow River

Since the 1990s, the Yellow River stream has been temporarily interrupted for several years, which affects the development of society, the economy and human life, limits the economic potential of the drainage areas, and especially causes great harm to regions on the lower reaches. Based on the analysis of the relationship between the development of society and economy and water scarcity, the author thinks it is necessary to optimize and adjust the industrial structure that has extravagantly consumed enormous amounts of water, and to develop ecological agriculture, industry and tourism which are balanced with the ecological environment. Finally, the author puts forward several pieces of advice and countermeasures about how to build the economic systems by which water can be used economically.     

升流式厌氧污泥床工艺处理酵母废液的研究

本文根据酵母废液的水质特点，采用了常温升流式厌氧污泥床处理工艺，即温度在２６．８－２８．０℃，进水ＣＯＤ为７１２９－９８２３ｍｇ·ｌ＾－１时，达到ＣＤＯ去除率６６．０－７１．０％，同时，沼气产率为２．４－３．０Ｌ·ｌ＾－１·ｄ＾－１，沼气中烷含量为６１．５－６９．１％。该法耗能小，沼气可回收，经济效果明显。     

在冶金企业建立隐患排查治理机制的探讨

2009年，国家安监总局提出了深入开展“三项行动”，切实加强“三项建设”活动，核心是查处治理隐患。由此可见，隐患排查治理是近年来安全监管的主要内容和中心任务，而企业作为隐患排查治理责任主体，如何建立隐患排查治理长效机制则是安全管理工作的重中之重。