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排序方式: 共有316条查询结果,搜索用时 140 毫秒
161.
Peter Schröder Soile Juuti Sashwati Roy Heinrich Sandermann Sirkka Sutinen 《Environmental science and pollution research international》1997,4(3):163-171
During long-term exposure of pine (Pinus sylvestris L.) seedlings to trichloro- and monochloroacetic acids via root uptake or acid mist treatments, both substances were removed from the plant tissues by metabolic activity. None of the treated plants exhibited visible stress symptoms at the concentrations used. In addition, the exposure to both substances led to dramatic changes in the activity of xenobiotic detoxification enzymes (peroxidase and gluthatione S-transferase) in the needles of the plants. 相似文献
162.
Wolf-Rainer Abraham Heinrich Lünsdorf Carsten Strömpl Balbina Nogales Edward R. B. Moore Kenneth N. Timmis 《Water, Air, & Soil Pollution: Focus》2003,3(3):57-64
A moorland soil site polluted with PCB showed a high diversity ofmetabolically active bacteria. Beside frequent types of 16S rRNAsequences similar to those of the species ofSphingomonasand the Acidobacterium phylum an unusual high number ofsequences from the genus Burkholderia were found. Burkholderia was also the main genus in isolates enriched onbiphenyl or various chlorobenzoates. In microcosm experimentssterilized surfaces exposed to PCB polluted soil always showed thepresence of clay aggregates formed by bacteria attached to thesubstratum. The bacteria use the PCB loaded clay colloids astransport medium for the water insoluble substrate to get accessto the carbon source. This is a novel mechanism of how bacteria dealwith hydrophobic substrates. 相似文献
163.
Julie S. Miller Lena Rudolph Andrew G. Zink 《Behavioral ecology and sociobiology》2011,65(10):1873-1879
Nest predation imposes a major cost to reproductive females, who should therefore take measures to avoid encounters with predators.
However, when predators are conspecifics, avoidance can be more difficult and may be a consequence of social or aggregative
behaviors. In this study, we measured the consequences of conspecific egg cannibalism on hatching success in the maritime
earwig (Anisolabis maritima), which occasionally form aggregations. We hypothesized that conspecific egg cannibalism is a byproduct of aggregation, and
that cannibalism rates would increase with aggregation density; however, our results do not support this. We combined field
data with a lab experiment to test the effectiveness of maternal nest defense in protecting nests from a conspecific. Nests
with a guard had higher hatching success and lower rates of cannibalism than unattended nests in the presence of a conspecific.
We also measured body and forcep size to see whether the outcome of contests was determined by relative size. Female guards
who were larger relative to the invading conspecific maintained their nest and had higher hatching success than females who
were relatively smaller, suggesting that the maritime earwig is under directional selection for larger body and/or forcep
size. 相似文献
164.
165.
It is shown the 4-bromobiphenyl in soil can be decomposed quickly and almost quantitatively to organic fragments free of bromine, in a specially designed bomb in the presence of a reagent such as cuprous oxide and aqueous alkali, by using microwave energy. 相似文献
166.
167.
168.
Voxi Heinrich S. Amavilah 《Natural resources forum》1993,17(4):273-287
The ideology and praxis of EPZs are reviewed, followed by an analysis of the economics of EPZs. Namibia's EPZ incentives are analysed in the context of successful EPZs elsewhere in the world. Although the Arandis EPZ in Namibia has some credible advantages, its fiscal incentives are not really special by international standards. The zone's incentives appear suitable for non-mineral processing industries, while the country's comparative advantages are in minerals. The conclusion is that EPZs are not of themselves engines of economic development, and must not be sold as such. Traditional investment strategies, eg R&D and joint ventures, offer better opportunities for development at about the same cost as EPZs. 相似文献
169.
Composite Biofilms grown in Acidic Mining Lakes and assessed by Electron Microscopy and Molecular Techniques 总被引:1,自引:0,他引:1
Heinrich Lünsdorf Dirk F. Wenderoth Wolf-Rainer Abraham 《Water, Air, & Soil Pollution: Focus》2002,2(3):69-79
Microbial consortia of composite biofilms, grown in surface water of acidicmining lakes near Lauchhammer, Germany, were investigated. The red-brown colored lake water was acidic (pH 2.5), had high concentrations of Fe(III), Al(III), and sulphate and low concentrations of dissolved organic matter. As a result the abundance of bacteria in the lake is with 104 cells mL-1 rather low. One input of organic material into the lake are autumnal leaves from trees, growing in the lakeside area. From aliquots of unfixed birch leave biofilms the 16S rRNA genes were amplified by PCR and community fingerprints were determined by single-strand conformation polymorphism (SSCP) analysis. Specific bands within the fingerprints were extracted from SSCP gels and sequenced for the taxonomical affiliation.These results were compared with those from the second type of biofilms which were grown on sterile substrata, floating submersed in surface waters of the lakes. By excising the bands from the gel and sequencing the individual bands bacterial taxa, common to both types of biofilms, were found but also some, which were only present in one type of biofilm. Ultrathin sectioned biofilms often showed bacteria associated with electron dense particles as main inorganic constituents. Elemental microanalysis by energy dispersive X-ray analysis (EDX) revealed them to contain iron, sulfur and oxygen as main elemental fractions and electron diffraction ring pattern analysis classified them to be schwertmannite. These bacteria and their interactions with each other as well as with the inorganic minerals formed in this lake generally is of great interest, in order to use these results for bioremediation applications. 相似文献
170.
H. Heinrich A. G. H. Pijpers I. H. Linskens E. van Leeuwen L. D. Eeftinck Schattenkerk J. P. M. Derikx E. Pajkrt 《黑龙江环境通报》2023,43(12):1485-1494