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151.
Copper-ligand complex for the decolorization of synthetic dyes 总被引:1,自引:0,他引:1
The reaction system containing Cu(II), hydrogen peroxide and D-arabinono-1,4-lactone was found to be effective in the decolorization and reduction of toxicity of azo, thiazine-, triphenylmethane- and anthraquinone-based synthetic dyes. More than 85% decolorization was obtained with 100ppm Acridine Orange, Azure B, Chicago Sky Blue 6B, Crystal Violet, Evans Blue, Poly B-411, Reactive Blue 2, Reactive Blue 5, and Remazol Brilliant Blue R incubated for 24h in the presence of 10mM CuSO(4), 20mM D-arabinono-1,4-lactone and 80 mM H(2)O(2). The rate of decolorization was not affected by pH in the range of 3-9. The rapid decolorization was accompanied by a fast decomposition of H(2)O(2) in the reaction mixture and by a fast production of hydroxyl radicals. 相似文献
152.
153.
Verma Y Rana SV 《Journal of environmental biology / Academy of Environmental Biology, India》2003,24(2):135-140
Metabolites viz. phenol, hippuric acid and total trichloro compounds of benzene, toluene and trichloroethylene respectively were estimated in the urine samples of male and female rats after exposure for a period of 30 days. The results exhibited higher metabolism in female rats than the male rats. Their metabolism might be regulated by cytochrome P450 isozymes in a gender specific manner. However, sex differences in the activity of glutathione-S-transferases of the liver have also been found to determine their toxicity. Results have been discussed with quantitative profiles of other enzymes established in the liver of male and female rats. 相似文献
154.
155.
Testosterone manifests some protective effects against benzene-induced toxicity in rats. However, mechanism of protection remains to be established. Data showed that testosterone modulates conjugation of reactive metabolites of benzene by influencing phase-II enzymes viz. glutathione-S-transferase, glutathione peroxidase, and catalase in both liver and kidney. These observations are supported by the opposite results obtained in castrated rats. It is postulated that testosterone decreases the formation of reactive oxygen species resulting into an increase in phase-II enzymes. Enhanced activity of these antioxidant enzymes is responsible for DNA strand repair as demonstrated by short comet tail length in liver and kidney of benzene and testosterone treated rats. Castration alters benzene pharmacokinetics by influencing these enzymes, a response which may be abolished by testosterone supplementation. 相似文献
156.
157.
A new spectrophotometric method for the determination of benzene in air is described. The method is based upon the nitration of benzene to m-dinitrobenzene and subsequent reduction to m-phenylenediamine. m-Phenylenediamine is determined by diazotization-coupling reaction. α-Naphthol is used as a coupling reagent. Beer's law is obeyed in the range of 10–80 μg of m-dinitribenzene per 25 mL sample. The dye shows a wavelength of maximum absorption at 530 nm. The dye is stable for ~ 30 h. Toluene, the major interferent, can be separated. Beer's law, sensitivity, reproducibility, and other reaction conditions such as time, temperature, and acidity were studied. Formation of stable dye is the main advantage of the method over the butanone method for benzene, in which the colored complex is stable for only 5 min. It is possible to determine traces of benzene (0.05–0.30 μg/mL) by extracting the azo dye in 10 mL iso-amyl alcohol; this also increases the stability of the dye up to 42 h. 相似文献
158.
Rahul B. Hiremath Bimlesh Kumar P. Balachandra N. H. Ravindranath 《Mitigation and Adaptation Strategies for Global Change》2010,15(6):571-590
The paper aims to assess the potential of decentralized bioenergy technologies in meeting rural energy needs and reducing
carbon dioxide (CO2) emissions. Decentralized energy planning is carried out for the year 2005 and 2020. Decentralized energy planning model
using goal programming technique is applied for different decentralized scales (village to a district) for obtaining the optimal
mix of energy resources and technologies. Results show that it is possible to meet the energy requirements of all the services
that are necessary to promote development and improve the quality of life in rural areas from village to district scale, by
utilizing the locally available energy resources such as cattle dung, leaf litter and woody biomass feedstock from bioenergy
plantation on wastelands. The decentralized energy planning model shows that biomass feedstock required at village to district
level can even be obtained from biomass conserved by shifting to biogas for cooking. Under sustainable development scenario,
the decentralized energy planning model shows that there is negligible emission of CO2, oxide of Sulphur (SOx) and oxide of nitrogen (NOx), even while meeting all the energy needs. 相似文献
159.
The surface sediments of Vembanad Lake, a tropical estuary on the west coast of India, were analyzed for carbon (TC, TOC,
TIC), nitrogen (TN), amino acids and two amino sugars. C/N ratios for the surface sediments vary from 1.0–21.8, indicating
terrestrial sources of organic matter. Various biogeochemical indicators based on amino acids such as Asp/β-ala and Glu/γ-aba
ratios revealed that the organic matter in the 5- to 10-cm surface sediments was fresh and had not undergone extensive degradation.
However, the Gluam/Galam ratio for surface sediments of Vembanad Lake varies from 0.4–2.1, indicating the dominance of bacterial
biomass in the sediments. Organic matter in the sediments was found to be highly reactive, with a reactivity index ranging
from 2.4–7.4, suggesting rapid remineralization.
Electronic Publication 相似文献
160.
Goswami Rahul Kumar Agrawal Komal Mehariya Sanjeet Verma Pradeep 《Environmental science and pollution research international》2022,29(41):61905-61937
Environmental Science and Pollution Research - Urbanization is a revolutionary and necessary step for the development of nations. However, with development emanates its drawback i.e., generation of... 相似文献