全文获取类型
收费全文 | 228篇 |
免费 | 23篇 |
国内免费 | 135篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 27篇 |
环保管理 | 19篇 |
综合类 | 184篇 |
基础理论 | 60篇 |
污染及防治 | 81篇 |
评价与监测 | 6篇 |
出版年
2024年 | 1篇 |
2023年 | 6篇 |
2022年 | 5篇 |
2021年 | 9篇 |
2020年 | 5篇 |
2019年 | 6篇 |
2018年 | 10篇 |
2017年 | 8篇 |
2016年 | 12篇 |
2015年 | 10篇 |
2014年 | 18篇 |
2013年 | 29篇 |
2012年 | 16篇 |
2011年 | 27篇 |
2010年 | 20篇 |
2009年 | 19篇 |
2008年 | 17篇 |
2007年 | 30篇 |
2006年 | 25篇 |
2005年 | 23篇 |
2004年 | 14篇 |
2003年 | 32篇 |
2002年 | 10篇 |
2001年 | 13篇 |
2000年 | 4篇 |
1999年 | 9篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 2篇 |
排序方式: 共有386条查询结果,搜索用时 11 毫秒
21.
Karina Martínez-Aguilar Eustacio Ramírez-Fuentes MA. Nieves Trujillo-Tapia Luis Alfredo Ortega-Clemente 《Journal of environmental science and health. Part. B》2013,48(12):771-776
AbstractMalathion is an organophosphorus pesticide widely used in agricultural crops, despite its toxicity. In addition, malaoxon occurs by oxidation of malathion being more toxic. The toxic effects of malathion and malaoxon in humans include hepatoxicity, breast cancer, genetic damage and endocrine disruption. The aim of this study involved assessing the effect of malathion commercial grade on Chroococcus sp., and its potential as an alternative to the removal of this pesticide and its transformation product such as malaoxon. We evaluated the effect of malathion at different concentrations (1, 25, 50, 75 and 100?ppm) on the biomass of the cyanobacteria Chroococcus sp. grown in medium BG-11; also, we analyse its ability to degrade both malathion and malaoxon into a temperature of 28?±?2?°C and at pH 6. The results showed that 50?ppm of malathion the cyanobacteria Chroococcus sp. reached the highest removal efficiency of malathion and malaoxon (69 and 65%, respectively); also, the growth rate of Chroococcus sp. increased without inhibiting the production of chlorophyll “a”, this can be explained by the hormesis phenomenon. Therefore, we consider that the cyanobacteria Chroococcus sp. may be a good candidate for bioremediation of aquatic systems contaminated with organophosphorus pesticides such as malathion and its transformation product such as malaoxon. 相似文献
22.
生物修复技术是治理大面积污染区域的一种有价值的修复方法。对国内外最新的生物刺激和生物强化技术进行调研,总结了该技术对治理近岸海域石油污染的研究进展,分析总结了施加营养盐技术对海洋环境的影响,以及生物修复技术尚存在的一些局限性。 相似文献
23.
Mary Beth LEIGH Wei-Min WU Erick CARDENAS Ondrej UHLIK Sue CARROLL Terry GENTRY Terence L. MARSH Jizhong ZHOU Philip JARDINE Craig S. CRIDDLE James M. TIEDJE 《Frontiers of Environmental Science & Engineering》2015,9(3):453
Stable isotope probing (SIP) was used to identify microbes stimulated by ethanol addition in microcosms containing two sediments collected from the bioremediation test zone at the US Department of Energy Oak Ridge site, TN, USA. One sample was highly bioreduced with ethanol while another was less reduced. Microcosms with the respective sediments were amended with 13C labeled ethanol and incubated for 7 days for SIP. Ethanol was rapidly converted to acetate within 24 h accompanied with the reduction of nitrate and sulfate. The accumulation of acetate persisted beyond the 7 d period. Aqueous U did not decline in the microcosm with the reduced sediment due to desorption of U but continuously declined in the less reduced sample. Microbial growth and concomitant 13C-DNA production was detected when ethanol was exhausted and abundant acetate had accumulated in both microcosms. This coincided with U(VI) reduction in the less reduced sample. 13C originating from ethanol was ultimately utilized for growth, either directly or indirectly, by the dominant microbial community members within 7 days of incubation. The microbial community was comprised predominantly of known denitrifiers, sulfate-reducing bacteria and iron (III) reducing bacteria including Desulfovibrio, Sphingomonas, Ferribacterium, Rhodanobacter, Geothrix, Thiobacillus and others, including the known U(VI)-reducing bacteria Acidovorax, Anaeromyxobacter, Desulfovibrio, Geobacter and Desulfosporosinus. The findings suggest that ethanol biostimulates the U(VI)-reducing microbial community by first serving as an electron donor for nitrate, sulfate, iron (III) and U(VI) reduction, and acetate which then functions as electron donor for U(VI) reduction and carbon source for microbial growth. 相似文献
24.
集约化蔬菜种植区地下水中反硝化细菌的分离鉴定 总被引:1,自引:0,他引:1
从研究我国典型集约化蔬菜种植区地下水中硝酸盐的来源和浓度人手,进行富集、培养、分离、纯化,筛选出一株具有反硝化作用的菌株,通过形态学、革兰氏染色结合16SrDNA序列同源性分析鉴定,其鉴定结果为农杆菌(Agrobacterium sp.).该研究为开展地下水硝酸盐污染的生物修复储备宝贵的菌种资源,为地下水中硝酸盐污染的原位微生物修复和相关污水的生物处理提供微牛物基础,对于经济、有效的解决地下水硝酸盐污染和水资源短缺的问题有着十分重要的意义. 相似文献
25.
为研发酸化土壤的生物修复技术,采用水培试验和自动电位滴定装置研究酸性条件下氮素形态对小麦幼苗根系释放氢氧根及培养液pH变化的影响。结果表明,小麦幼苗在初始pH值为4.0,n(NO3-)∶n(NH4+)比值(以下简称硝/铵比)分别为15∶1、3∶1和1∶1的营养液中培养6 d后营养液pH升高,且增幅随硝/铵比的增加而增大,小麦对硝态氮的吸收量和氢氧根释放量呈相同的变化趋势,说明小麦对硝态氮的吸收偏好导致根系释放氢氧根,进而使得培养液pH升高。小麦幼苗在硝/铵比为3∶1,初始pH值分别为4.0、4.5和5.0的营养液中培养6d后,培养液pH和氢氧根释放量的增幅随初始pH的升高而降低,说明低pH条件有利于小麦幼苗对硝态氮的吸收,可促进小麦根系释放更多的氢氧根。10 h的恒定pH试验结果表明,恒定pH条件下小麦根系释放的氢氧根数量大于非恒定pH条件,且硝态氮比例越大,差值越大。因此,可以根据小麦在酸性条件下对硝态氮的吸收偏好建立酸化土壤的生物修复方法,即调节硝态氮含量以加大小麦根系的氢氧根释放量,进而提高土壤pH。 相似文献
26.
27.
C. Lobo M. Sanchez C. Garbi E. Ferrer M. J. Martinez-Iñigo J. L. Allende C. Martín L. Casasús R. Alonso-Sanz A. Gibello M. Martin 《Water, Air, & Soil Pollution: Focus》2003,3(3):35-46
Molecular techniques and modelling are presented as powerful tools required in the performance of efficient soil and water bioremediation systems. An Escherichia coli CC118-D strain was constructed by inserting the Klebsiella pneumoniae hpa B gene, coding for the unstable 3,4-dihydroxyphenylacetate 2,3-dioxygenase, into its chromosome. When the constructed strain was immobilized, both enzyme stability and viability increased along the studied period, in absence of antibiotic. We proposed this strategy as an approach to overcoming plasmid instability and to enhance enzyme activity and stability, avoiding antibiotic utilization. A model was developed to understand and predict the behaviour of bacteria and pollutants in a bioreactor system, considering: fluid dynamics, molecular/cellular scale processes and biofilm formation. 相似文献
28.
29.
本文结合了国内外研究成果,概述了石油污染土壤的现状,分析了生物修复石油污染土壤的环境影响因子,如:pH值、温度、水分、土壤质地等,并对这一治理方法在我国的发展前景进行了展望,为今后这方面的研究提供建议。 相似文献
30.
城市土壤污染研究现状与趋势 总被引:29,自引:0,他引:29
城市土壤是城市生态环境系统的有机组成部分,对城市的可持续发展有着重要的意义.城市化和工业化进程的加快,造成城市土壤污染、侵蚀、酸化和硬化以及土壤生物和植被退化等一系列较为严重的城市环境问题,直接危及到城市居民的健康和安全;因此,城市土壤污染问题已经引起人们的高度重视.近10多年来,国内外有关城市土壤重金属污染,微有机物污染,生源要素污染和城市土壤污染的环境与健康风险评价等诸多研究取得了一系列的研究成果.本文主要就以上研究成果进行了较为系统地总结与阐述,并且在此基础上提出了今后有关城市土壤污染研究的发展重点与趋势,以期为改善城市生态环境质量提供重要的科学依据. 相似文献