全文获取类型
收费全文 | 1015篇 |
免费 | 18篇 |
国内免费 | 14篇 |
专业分类
安全科学 | 21篇 |
废物处理 | 83篇 |
环保管理 | 94篇 |
综合类 | 107篇 |
基础理论 | 205篇 |
环境理论 | 1篇 |
污染及防治 | 325篇 |
评价与监测 | 117篇 |
社会与环境 | 85篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 21篇 |
2022年 | 72篇 |
2021年 | 74篇 |
2020年 | 32篇 |
2019年 | 32篇 |
2018年 | 67篇 |
2017年 | 42篇 |
2016年 | 60篇 |
2015年 | 42篇 |
2014年 | 69篇 |
2013年 | 94篇 |
2012年 | 50篇 |
2011年 | 58篇 |
2010年 | 43篇 |
2009年 | 39篇 |
2008年 | 42篇 |
2007年 | 38篇 |
2006年 | 33篇 |
2005年 | 27篇 |
2004年 | 16篇 |
2003年 | 20篇 |
2002年 | 24篇 |
2001年 | 18篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 4篇 |
1989年 | 1篇 |
1985年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1973年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有1047条查询结果,搜索用时 15 毫秒
71.
Maria das Graças Alonso de Oliveira Jean Nunes dos Santos Patrícia Ramos Cury Victor Hugo Pereira da Silva Nara Rejane Cruz Oliveira Ricardo da Costa Padovani Adriana Marcassa Tucci Daniel Araki Ribeiro 《Environmental science and pollution research international》2014,21(8):5760-5764
The aim of the present study was to comparatively evaluate genomic damage (micronucleus) and cellular death (pyknosis, karyolysis, and karyorrhexis) in exfoliated oral mucosa cells from crack cocaine users by micronucleus test. A total of 30 crack cocaine users and 30 health controls (non-exposed individuals) were included in this setting. Individuals had epithelial cells from cheek mechanically exfoliated, placed in fixative, and dropped in clean slides, which were checked for the above nuclear phenotypes. The results pointed out significant statistical differences (p?<?0.05) of micronucleated oral mucosa cells from crack cocaine users. Exposure to crack cocaine caused an increase of other nuclear alterations closely related to cytotoxicity such as karyolysis in oral cells as well. In summary, these data indicate that crack cocaine is able to induce chromosomal breakage and cellular death in oral mucosa cells of users. 相似文献
72.
Flávio Henrique Tincani Osório Luis Felipe Oliveira Silva Laercio Dante Stein Piancini Ana Carolina Barni Azevedo Samuel Liebel Flavia Yoshie Yamamoto Vivian Prá Philippi Marcos Leandro Silva Oliveira Claudia Feijó Ortolani-Machado Francisco Filipak Neto Marta Margarete Cestari Helena Cristina da Silva de Assis Ciro Alberto de Oliveira Ribeiro 《Environmental science and pollution research international》2014,21(15):9145-9160
The Tubarão River rises in Santa Catarina, Brazil, and has been historically affected by coal mining activities around its springhead. To evaluate its water conditions, an investigation regarding a possible decontamination gradient associated with the increased river flow toward the estuary, as well as the influence of seasonality over this gradient was performed through a series of biomarkers (vitellogenin, comet assay, lipid peroxidation, protein carbonylation, gluthatione, gluthatione S-transferase, acetylcholinesterase, light microscopy in liver, and scanning electron microscopy in gills) and chemical analysis (polycyclic aromatic hydrocarbons (PAHs) in bile and metal analysis in sediment) in the cichlid Geophagus brasiliensis. Two collections (summer and winter) were made in four distinct sites along the river, while sediments were sampled between those seasons. As expected, the contamination linked exclusively to mining activities was not observed, possibly due to punctual inputs of contaminants. The decontamination gradient was not observed, although seasonality seemed to have a critical role in the responses of biomarkers and availability of contaminants. In the summer, the fish presented higher histopathological damages and lower concentrations of PAHs, while in the winter they showed both higher genetic damage and accumulation of PAHs. The Tubarão suffers impacts from diverse activities, representing health risks for wild and human populations. 相似文献
73.
Elisama Vieira dos Santos Shirley Feitosa Machado Sena Djalma Ribeiro da Silva Sergio Ferro Achille De Battisti Carlos A. Martínez-Huitle 《Environmental science and pollution research international》2014,21(14):8466-8475
Scale-up of anodic oxidation system is critical to the practical application of electrochemical treatment in bio-refractory organic wastewater treatment. In this study, the scale-up of electrochemical flow system was investigated by treating petrochemical wastewater using platinized titanium (Ti/Pt) and boron-doped diamond (BDD) anodes. It was demonstrated that flow cell was successfully scaled-up because when it was compared with batch mode (Rocha et al. 2012b), higher performances on organic matter removal were achieved. Under the suitable operating conditions and better anode material, the chemical oxygen demand (COD) of petrochemical wastewater was reduced from 2,746 to 200 mg L?1 within 5 h with an energy consumption of only 56.2 kWh m?3 in the scaled-up BDD anode system. These results demonstrate that anode flow system is very promising in practical bio-refractory organic wastewater treatment. 相似文献
74.
Eliana S. Da Silva Vanessa Prevot Claude Forano Pascal Wong-Wah-Chung Hugh D. Burrows Mohamed Sarakha 《Environmental science and pollution research international》2014,21(19):11218-11227
Decatungstate W10O32 4? was efficiently intercalated between the layers of three-dimensionally ordered macroporous Mg2Al-layered double hydroxide. The structural and textural properties of as-prepared intercalated compound were characterized using different solid-state characterization techniques such as X-ray powder diffraction, FTIR and Raman spectroscopies and electronic microscopy. The photocatalytic properties of immobilized W10O32 4? within Mg2Al structure were investigated using 2-(1-naphthyl) acetamide (NAD) as a model of pesticide. The influence of different parameters such as amount of catalyst, pH and oxygen concentration were investigated. An optimal NAD degradation was obtained for a photocatalyst concentration of 60 mg l?1. Under our experimental conditions, this heterogeneous photocatalyst induces photodegradation of 60 % of NAD after 17 h of irradiation at 365 nm and at pH 6.6. Interestingly, pesticide photodegradation leads to the mineralization of substrates to H2O and CO2 and the photocatalyst can be recycled and reused without any loss of activity over four cycles. 相似文献
75.
Salt marsh plants as key mediators on the level of cadmium impact on microbial denitrification 总被引:1,自引:0,他引:1
C. Marisa R. Almeida Ana P. Mucha Marta Nunes da Silva Maria Monteiro Paula Salgado Tatiana Necrasov Catarina Magalhães 《Environmental science and pollution research international》2014,21(17):10270-10278
The fate of excess nitrogen in estuaries is determined by the microbial-driven nitrogen cycle, being denitrification a key process since it definitely removes fixed nitrogen as N2. However, estuaries receive and retain metals, which may negatively affect this process efficiency. In this study, we evaluated the role of salt marsh plants in mediating cadmium (Cd) impact on microbial denitrification process. Juncus maritimus and Phragmites australis from an estuary were collected together with the sediment involving their roots, each placed in vessels and maintained in a greenhouse, exposed to natural light, with tides simulation. Similar non-vegetated sediment vessels were prepared. After 3 weeks of accommodation, nine vessels (three per plant species plus three non-vegetated) were doped with 20 mg/L Cd2+ saline solution, nine vessels were doped with 2 mg/L Cd2+ saline solution and nine vessels were left undoped. After 10 weeks, vessels were dissembled and denitrification potential was measured in sediment slurries. Results revealed that the addition of Cd did not cause an effect on the denitrification process in non-vegetated sediment but had a clear stimulation in colonized ones (39 % for P. australis and 36 % for J. maritimus). In addition, this increase on denitrification rates was followed by a decrease on N2O emissions and on N2O/N2 ratios in both J. maritimus and P. australis sediments, increasing the efficiency of the N2O step of denitrification pathway. Therefore, our results suggested that the presence of salt marsh plants functioned as key mediators on the degree of Cd impact on microbial denitrification. 相似文献
76.
Miguel Angelo Mastella Edivelton Soratto Gislon Fernando Pelisser Cláudio Ricken Luciano da Silva Elídio Angioletto Oscar Rubem Klegues Montedo 《Waste management (New York, N.Y.)》2014,34(8):1495-1500
The creation of metal parts via casting uses molds that are generally made from sand and phenolic resin. The waste generated after the casting process is called waste foundry sand (WFS). Depending on the mold composition and the casting process, WFS can contain substances that prevent its direct emission to the environment. In Brazil, this waste is classified according to the Standard ABNT NBR 10004:2004 as a waste Class II (Non-Inert). The recycling of this waste is limited because its characteristics change significantly after use. Although the use (or reuse) of this byproduct in civil construction is a technically feasible alternative, its effects must be evaluated, especially from mechanical and environmental points of view. Thus, the objective of this study is to investigate the effect of the use of WFS in the manufacture of cement artifacts, such as masonry blocks for walls, structural masonry blocks, and paving blocks. Blocks containing different concentrations of WFS (up to 75% by weight) were produced and evaluated using compressive strength tests (35 MPa at 28 days) and toxicity tests on Daphnia magna, Allium cepa (onion root), and Eisenia foetida (earthworm). The results showed that there was not a considerable reduction in the compressive strength, with values of 35 ± 2 MPa at 28 days. The toxicity study with the material obtained from leaching did not significantly interfere with the development of D. magna and E. foetida, but the growth of the A. cepa species was reduced. The study showed that the use of this waste in the production of concrete blocks is feasible from both mechanical and environmental points of view. 相似文献
77.
Rogério Luiz Da Silva Claudia Pereira Da silva Sandro Navickiene 《Journal of environmental science and health. Part. B》2013,48(6):589-594
An extraction method based on matrix solid-phase dispersion was developed to determine pirimicarb, methyl parathion, malathion, procymidone, α -endosulfan and β -endosulfan in lettuce using gas chromatography-mass spectrometry. The best results were obtained using 4.0 g of lettuce, 2.0 g of silica as dispersant sorbent, 0.1 g of activated carbon as clean up sorbent and acetonitrile as eluting solvent. The method was validated using lettuce samples fortified with pesticides at six different concentration levels (0.1 to 2.0 mg/kg). Average recoveries (7 replicates) ranged from 50 to 120 %, with relative standard deviations between 0.6 and 8.0 %. Detection and quantification limits for lettuce ranged from 0.01 to 0.02 mg/kg and 0.04 to 0.10 mg/kg, respectively. 相似文献
78.
Ana L. de Toffoli Kamilla da Mata Márcia C. Bisinoti 《Journal of environmental science and health. Part. B》2013,48(11):753-759
A method for the identification and quantification of pesticide residues in water, soil, and sediment samples has been developed, validated, and applied for the analysis of real samples. The specificity was determined by the retention time and the confirmation and quantification of analyte ions. Linearity was demonstrated over the concentration range of 20 to 120 µg L?1, and the correlation coefficients varied between 0.979 and 0.996, depending on the analytes. The recovery rates for all analytes in the studied matrix were between 86% and 112%. The intermediate precision and repeatability were determined at three concentration levels (40, 80, and 120 µg L?1), with the relative standard deviation for the intermediate precision between 1% and 5.3% and the repeatability varying between 2% and 13.4% for individual analytes. The limits of detection and quantification for fipronil, fipronil sulfide, fipronil-sulfone, and fipronil-desulfinyl were 6.2, 3.0, 6.6, and 4.0 ng L?1 and 20.4, 9.0, 21.6, and 13.0 ng L?1, respectively. The method developed was used in water, soil, and sediment samples containing 2.1 mg L?1 and 1.2% and 5.3% of carbon, respectively. The recovery of pesticides in the environmental matrices varied from 88.26 to 109.63% for the lowest fortification level (40 and 100 µg kg?1), from 91.17 to 110.18% for the intermediate level (80 and 200 µg kg?1), and from 89.09 to 109.82% for the highest fortification level (120 and 300 µg kg?1). The relative standard deviation for the recovery of pesticides was under 15%. 相似文献
79.
Nicholas Molyneux Gil Rangel da Cruz Robert L. Williams Rebecca Andersen Neil C. Turner 《Ambio》2012,41(8):823-840
The climate in Timor Leste (East Timor) is predicted to become about 1.5 °C warmer and about 10 % wetter on average by 2050. By the same year, the population is expected to triple from 1 to 2.5–3 million. This article maps the predicted changes in temperature and rainfall and reviews the implications of climate change and population growth on agricultural systems. Improved cultivars of maize, rice, cassava, sweet potato and peanuts with high yield performance have been introduced, but these will need to be augmented in the future with better adapted cultivars and new crops, such as food and fodder legumes and new management practices. The requirements for fertilizers to boost yields and terracing and/or contour hedgerows to prevent soil erosion of steeply sloping terrain are discussed. Contour hedges can also be used for fodder for improved animal production to provide protein to reduce malnutrition. 相似文献
80.
Pileggi M Pileggi SA Olchanheski LR da Silva PA Munoz Gonzalez AM Koskinen WC Barber B Sadowsky MJ 《Chemosphere》2012,86(11):1127-1132
Mesotrione is a benzoylcyclohexane-1,3-dione herbicide that inhibits 4-hydroxyphenyl pyruvate dioxygenase in target plants. Although it has been used since 2000, only a limited number of degrading microorganisms have been reported. Mesotrione-degrading bacteria were selected among strains isolated from Brazilian aquatic environments, located near corn fields treated with this herbicide. Pantoea ananatis was found to rapidly and completely degrade mesotrione. Mesotrione did not serve as a sole C, N, or S source for growth of P. ananatis, and mesotrione catabolism required glucose supplementation to minimal media. LC-MS/MS analyses indicated that mesotrione degradation produced intermediates other than 2-amino-4-methylsulfonyl benzoic acid or 4-methylsulfonyl-2-nitrobenzoic acid, two metabolites previously identified in a mesotrione-degrading Bacillus strain. Since P. ananatis rapidly degraded mesotrione, this strain might be useful for bioremediation purposes. 相似文献