首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   255篇
  免费   26篇
  国内免费   8篇
综合类   21篇
化学工业   157篇
金属工艺   3篇
机械仪表   1篇
建筑科学   25篇
矿业工程   8篇
能源动力   6篇
轻工业   13篇
水利工程   11篇
石油天然气   32篇
一般工业技术   6篇
冶金工业   4篇
自动化技术   2篇
  2023年   4篇
  2022年   5篇
  2021年   12篇
  2020年   4篇
  2019年   12篇
  2018年   8篇
  2017年   6篇
  2016年   7篇
  2015年   6篇
  2014年   10篇
  2013年   31篇
  2012年   16篇
  2011年   12篇
  2010年   15篇
  2009年   19篇
  2008年   22篇
  2007年   17篇
  2006年   19篇
  2005年   15篇
  2004年   15篇
  2003年   12篇
  2002年   5篇
  2001年   6篇
  2000年   2篇
  1999年   3篇
  1998年   1篇
  1996年   1篇
  1994年   2篇
  1991年   1篇
  1989年   1篇
排序方式: 共有289条查询结果,搜索用时 15 毫秒
1.
Bioremediation strategies have been applied to clean up petroleum hydrocarbon (PHC) impacted sites. Introducing PHC degrading microorganisms (bioaugmentation) and enhancing the in‐situ nutrients availability (biostimulation) are widely used strategies. These strategies can be combined to lead to a better bioremediation performance. In this work, Pseudomonas fluorescens was isolated from a PHC impacted site. Through a 23 factorial design plan, the effect of various combinations of nitrate, sulphate, and phosphate ions on the PHC bioremediation performance by P. fluorescens was investigated using catechol, an essential metabolic intermediate of BTEX degradation, as the sole carbon source. The maximum specific catechol degradation rate was chosen as the response to evaluate the catechol bioremediation performance. The ANOVA results indicated that the presence of nitrate ions alone lowered the maximum specific catechol degradation rate, which can be explained by the accumulation of nitrites and ammonia during the denitrification process by P. fluorescens. It was noted that dosing sulphate ions alone did not affect the bioremediation performance, which indicates P. fluorescens can grow in a sulphur‐limited environment. In contrast, the presence of sulphate and nitrate ions together can lead to a higher specific catechol degradation rate. This may be caused by the presence of sulphate that can suppress the production of nitrites. The importance of phosphate ions on catechol biodegradation was investigated. The absence of phosphate led to incomplete biodegradation. Introducing phosphate ions can accelerate catechol degradation, which can be explained by the secretion of organic acids.  相似文献   
2.
A commercial microbial agent (Devoroil) was applied to study the biodegradation efficiency of four petroleum contaminated soils/sediment collected all around China. After 40 days of biodegradation, the total petroleum hydrocarbons removal rates were 41.8%, 95.7%, 84.5% and 93.5%. The soil achieved the lowest biodegradation efficiency was chosen to conduct another bioremediation experiment to study the degradation dynamics of petroleum and the microbial mechanism. The results showed that biodegradation dynamics correspond to a negative index relation. The analysis of PCR-DGGE exhibited that Thioalkalivibrio sp., Nocardia sp. and Mycobacterium sp. were probably the dominant functional microbes in the contaminated environment.  相似文献   
3.
采用高通量测序法研究东营某炼油厂不同污染程度的土壤中细菌、真菌和古菌的群落结构,分析石油污染对土壤微生物群落结构的影响。结果表明:微生物群落可操作分类单元(OTU)数量随着油污土壤油含量的增加先增多后减少;Beta多样性与土壤石油污染程度有一定的关系;受污染程度相近的土壤样品,微生物群落结构的相似度较高。细菌、真菌、古菌群落中相对丰度最大的分别为变形菌门(Proteobacteria)、子囊菌门(Ascomycota)和奇古菌门(Thaumarchaeota),分别为44.8%~79.5%、54.4%~83.2%和28.3%~93.1%。属水平群落聚类分析结果显示,随着土壤油含量增加,真菌踝节菌属(Talaromyces)的相对丰度由0增加到31.6%,细菌寡养单胞菌(Stenotrophomonas)由0.1%增加到1.9%,古菌甲烷八叠球菌属(Methanosarcina)由5.8%增加到37.8%。微生物群落结构与土壤中烃类组分含量相关性分析发现,真菌炭疽菌属(Colletotrichum)、细菌节杆菌属(Arthrobacter)、古菌盐红菌属(Halorubrum)与烷烃含量呈显著正相关性,细菌甲基杆菌属(Methylobacterium)、古菌甲烷八叠球菌属(Methanosarcina)与芳香烃含量呈显著正相关性。  相似文献   
4.
胡南  陈雪  张辉  李艾书  李广悦  王永东  丁德馨 《化工学报》2021,72(10):5354-5361
对有钙源条件下Sporosarcina pasteurii诱导碳酸盐-铀共沉淀修复低浓度铀废水的性能开展了试验研究。试验结果表明,该细菌能分泌脲酶水解尿素诱导产生方解石并促使其与铀发生共沉淀,使废水中铀的去除率达到95.38%;该细菌能够耐受的铀浓度高达500 mg/L;铀的去除率随Ca2+浓度的升高而增加;温度在30℃左右和碱性环境有利于方解石与铀的共沉淀。对沉淀产物进行XRD、SEM-EDS表征分析表明,其主要成分为方解石,且包含铀元素;消解分析表明,在方解石形成过程中铀以共沉淀的方式被固定到了沉淀产物中。本研究表明,Sporosarcina pasteurii诱导碳酸盐-铀共沉淀对修复低浓度铀废水有潜在应用前景。  相似文献   
5.
This study was carried out to investigate the response and relationship between nitrogen fixing enzymes during the remediation of different concentrations of high molecular weight four rings Polynuclear Aromatic Hydrocarbon (PAH) Pyrene by microalgae Synechocystis sp. (cyanobacteria) with artificial developed indigenous bacterial consortium. One axenic microalgal culture of Synechocystis sp. and two pyrene degrading indigenous bacteria with efficient removal capabilities viz. Pseudomonas indoxyladons and Bacillus benzoevorans isolated from crude oil polluted site and common industrial effluent canal were used to construct the consortium. The effect of pyrene on algal growth in terms of chlorophyll-a was measured and it was found that in the presence of bacteria, the growth and bioremediation capacity of Synechocystis sp. raised tremendously, whereas Synechocystis sp. monoculture exhibited concentration dependent decrease. Moreover, the nitrogen fixing enzymes; nitrate reductase (NR), glutamine synthetase (GS), and succinate dehydrogenase (SDH) showed chronological decrease by 93%, 90%, and 98%, respectively. Increased Bioremediation of pyrene by consortium JPNKA7B2 (Mix culture of Synechocystis sp., Pseudomonas indoxyladons, and Bacillus benzoevorans) was eliminated at 94.1% in 50 mg/L, which indirectly retarded the nitrogen fixing enzymes – NR, GS, and SDH. However, Synechocystis sp. monoculture could remediate up to 36% at 1.5 mg/L after 16 days of incubation.  相似文献   
6.
7.
Microbial fuel cells (MFCs) produce electricity as a result of the microbial metabolism of organic substrates, hence they represent a sustainable approach for energy production and waste treatment. If the technology is to be implemented in industry, low cost and sustainable bioelectrodes must be developed to increase power output, increase waste treatment capacity, and improve service intervals. Although the current application of abiotic electrode catalysts, such as platinum and electrode binders such as Nafion leads to greater MFC performance, their use is cost prohibitive. Novel bioelectrodes which use cost effective and sustainable materials are being developed. These electrodes are developed with the intention to reduce start-up time, reduce costs, extend life-span and improve core MFC performance metrics (i.e. power density, current density, chemical oxygen demand (COD) reduction and Coulombic efficiency (CE)). Comparison of different MFC systems is not an easy task. This is due to variations in MFC design, construction, operation, and different inocula (in the case of mixed-culture MFCs). This high intra-system variability should be considered when assessing MFC data, operation and performance. This review article examines the major issues surrounding bioanode and biocathode improvement in different MFC systems, with the ultimate goal of streamlining and standardising improvement processes. © 2018 Society of Chemical Industry  相似文献   
8.
赖飞  刘彤  赵洪江 《广东化工》2014,(6):123-124
近年来,利用生物修复法来治理受汞污染的土壤得到了迅速发展,并取得了很多的成果。文章对土壤汞污染生物修复技术的国内外研究现状进行综述,进而展望其发展前景,以对今后土壤修复进行指导。  相似文献   
9.
铀矿冶行业的迅速发展造成了铀尾矿(渣)的大量堆积,对周围土壤和地下水的污染日益严重,对人类健康和社会安全造成潜在威胁,铀污染的治理已成为亟待解决的环境问题。针对铀污染的修复技术层出不穷,实践证明只使用传统物理化学方法修复铀污染有时很难达到理想的修复效果,并且修复成本通常非常昂贵。而微生物修复技术的出现,为铀污染的修复提供了更绿色,经济,高效,稳定的手段,引起了研究学者们的广泛关注,具有较大的研究价值和广阔的应用前景。首先对现阶段铀污染的修复技术进行了简单介绍,并重点综述了铀污染的微生物修复技术及其在国内外研究发展现状,接着介绍了铀污染微生物修复作用机制以及环境因子对铀污染修复效果的影响,最后分析了目前铀污染微生物修复技术存在的问题,并提出未来有待深入研究的方向,为铀污染的修复提供了新思路。  相似文献   
10.
植物内生菌在环境污染修复中的应用研究进展   总被引:1,自引:0,他引:1  
植物内生细菌作为微生物学同植物微生态学的重要交叉点,近年来备受关注。国内外学者针对植物内生菌这一宝贵的微生物资源库进行了多方面的研究和探索。本文主要介绍植物内生菌的概念和特点,并重点阐述了植物内生菌在环境污染的生物修复中的应用研究动态。旨在为植物内生菌的实际应用提供新的思路。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号