五氯酚钠与二英对人外周血淋巴细胞的影响

将五氯酚钠(Na-PCP)与二(噁)英(2,3,7,8-TCDD)作为受试物,观察了人外周血淋巴细胞的彗星率和微核率.结果显示:Na-PCP与二噁英各质量浓度组的彗星率与微核率均比阴性对照组有明显的增高(P＜0.001),而且随着质量浓度的增加而增高,呈明显的剂量-效应关系;阴性对照组与助溶剂对照组没有明显差异(P＞0.05);Na-PCP与二(噁)英(2,3,7,8-TCDD)会对人外周血淋巴细胞的DNA造成损伤,而且随着质量浓度的增加,其对DNA的损伤将更加严重;Na-PCP对人外周血淋巴细胞造成的损伤为联合毒性所致.      

大力推进重庆市生态农业建设实现社会可持续发展

经过多年实践,中国生态农业建设取得了显著的经济、生态、社会效益。本文针对重庆市农业生态环境现状,从可持续发展的角度,提出重庆市生态农业建设的对策措施。     

Degradation of recalcitrant organic matter in SAARB leachate by a combined process of coagulation and catalytic ozonation

Environmental Science and Pollution Research - A combined coagulation and γ-Al2O3 catalytic ozonation process was used to treat semi-aerobic aged refuse biofilter (SAARB) effluent from...     

Vinasse-based biochar magnetic composites: adsorptive removal of tetracycline in aqueous solutions

Environmental Science and Pollution Research - Highly efficient and cost-effective adsorbents for antibiotic removal are the key to mitigate pollution by industrial wastewaters. Pyrolyzing low-cost...     

Spatial and temporal variations of the diatom communities in megacity streams and its implications for biological monitoring

Environmental Science and Pollution Research - Diatoms have been proven to be good indicators of natural stream conditions, but little is known about the seasonal variability of diatom communities...     

Correction to: Study on habitat suitability of overwintering cranes based on landscape pattern change—a case study of typical lake wetlands in the middle and lower reaches of the Yangtze River

Environmental Science and Pollution Research - The correct corresponding Author of this paper is Bin Dong.     

Microbial response to repeated treatments of manure containing sulfadiazine and chlortetracycline in soil

Substantive addition of antibiotic-contaminated manure to agricultural soil may lead to “persistent” residues of antibiotics and may affect soil health. Therefore, this study examines the effects of repeated manure treatments containing sulfadiazine (SDZ) and chlortetracycline (CTC) residues, both individually and combined, on the functional diversity and structure of soil microbial communities in the soils under laboratory conditions. The average well color development (AWCD), Simpson diversity index (1/D, dominant populations), Shannon-Wiener diversity index (H′, richness), and McIntosh diversity index (U, evenness) in the antibiotics-treated soils decreased in the first 60-day treatment and then gradually recovered or even exceeded the initial level in the unamended soils with increasing treatment frequency. A total of 11 specific bands in temperature gradient gel electrophoresis (TGGE) profiles were observed and sequence analyzed for five repeated treatments, and most of them belonged to the phyla Firmicutes, Actinobacteria, and Proteobacteria. These results indicate that repeated treatments of manure containing SDZ and CTC residues can alter soil microbial community structure, although they have a temporary suppression effect on soil microbial functional diversity.     

石化企业苯泄漏检测影响因素实验研究

为考察石化企业含苯物质泄漏检测结果的影响因素,在不同风速、不同苯浓度和不同检测距离的条件下,对苯泄漏检测结果影响因素进行了实验研究.结果表明,在距离泄漏源20,50,100,200cm处均未检测到苯的浓度,只在距离泄漏源5cm处检测到了数据;当风速一定时,泄漏气体浓度越大,泄漏检测结果越大,检测结果达到峰值所用时间越短;当泄漏气体浓度一定时,风速越大,泄漏检测结果越小,检测结果达到峰值所用时间越短.     

常见烯烃爆炸特性的研究

为减少烯烃类爆炸事故带来的严重危害,采用国际通用的20L球型爆炸测试装置测试了常温初始压力为0.1 MPa条件下,4种常见烯烃的爆炸特性参数.结果表明,随着烯烃含量的增加各项爆炸特性参数均呈现出先增大后减小的特征,最大爆炸压力和爆炸指数均在化学计量比附近获得,4种烯烃最大爆炸压力分别为乙烯1.5 MPa、丙烯1.3 MPa、正丁烯1.5 MPa、异丁烯1.6 MPa,爆炸指数分别为16.56 (MPa·m)/s、7.37(MPa·m)/s、16.98 (MPa·m)/s、29.07(MPa· m)/s.     

变截面轻型门式刚架拼接处设计方法研究

采用ANSYS有限元分析软件,对一单层单跨变截面轻型门式刚架厂房进行有限元模拟与分析.对变截面轻型门式刚架试件进行单调和循环加载,得出试件荷载-位移曲线和滞回曲线.并对变截面柱和变截面梁翼缘进行路径分析,得出柱和梁Yon Mises应力较小与较大的位置.从结构的破坏结果得出结构易破坏与较安全的部位,以供类似工程在设计时作为参考.