全文获取类型
收费全文 | 351篇 |
免费 | 3篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 5篇 |
环保管理 | 20篇 |
综合类 | 128篇 |
基础理论 | 89篇 |
污染及防治 | 80篇 |
评价与监测 | 17篇 |
社会与环境 | 8篇 |
出版年
2022年 | 3篇 |
2018年 | 4篇 |
2017年 | 6篇 |
2016年 | 8篇 |
2015年 | 6篇 |
2014年 | 7篇 |
2013年 | 17篇 |
2012年 | 21篇 |
2011年 | 20篇 |
2010年 | 15篇 |
2009年 | 14篇 |
2008年 | 10篇 |
2007年 | 14篇 |
2006年 | 17篇 |
2005年 | 8篇 |
2004年 | 11篇 |
2003年 | 7篇 |
2002年 | 13篇 |
2001年 | 12篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 10篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1974年 | 2篇 |
1967年 | 3篇 |
1966年 | 8篇 |
1965年 | 4篇 |
1964年 | 5篇 |
1963年 | 5篇 |
1962年 | 5篇 |
1960年 | 2篇 |
1959年 | 2篇 |
1958年 | 3篇 |
1957年 | 3篇 |
1955年 | 4篇 |
1954年 | 2篇 |
1952年 | 2篇 |
1951年 | 3篇 |
1943年 | 2篇 |
1940年 | 2篇 |
1939年 | 2篇 |
排序方式: 共有356条查询结果,搜索用时 15 毫秒
261.
It is expected that the Baltic region becomes a major centre of economic growth and prosperity in Europe already during this
decade (Anon. 2000). Therefore, an Agenda 21 for the Baltic region (Baltic 21) was developed to ensure a sustainable development.
Especially the coastal ecosystems are subject to increasing anthropogenic pressure e.g. eutrophication, traffic, harbours,
tourism or offshore wind parks. Eutrophication remains the main ecological problem in the Baltic Sea and has serious negative
social and economical consequences. Inner and outer coastal waters play an important role as buffers and filters for the Baltic
proper. Consequently, the utilization and preservation of their self-purification capacity is of great importance.
Combined results of our own coastal research and of the international workshop ‘Baltic coastal ecosystems: structure, function
and coastal zone management’ (Rostock University, November 2001) are presented here. Conclusions for an improved integrated
coastal zone management of Baltic coastal ecosystems will be presented. 相似文献
262.
263.
Dietmar Glindemann Ulrich Stottmeister Armin Bergmann 《Environmental science and pollution research international》1996,3(1):17-19
The possible liberation of highly toxic and mutagenic phosphine from putrefying media raises the question of its significance as a problem of hygiene. Free phosphine was established by gas chromatography as a universal trace component in gas emitted from the anaerobic biosphere. Sources of phosphine include landfills, compost processing, sewage sludge, animal slurry and river sediments. We detected maximum concentrations in the order of 20 ppb(v/v). 相似文献
264.
Summary Scent-marking of artificial food sources by workers of the bumblebee,Bombus terrestris, was investigated. Odour marks deposited on artificial flowers were subsequently collected and chemically analysed. Alkanes and alkenes were identified as the main components. The behaviour mediating capacity of synthetic mixtures of the identified compounds was bioassayed using an artificial flower system. A mixture of alkanes and alkenes, close to natural proportions, released regular foraging behaviour. The reaction proved to be dose-dependent. 相似文献
265.
The subterrestrial groundwater treatment (in situ treatment) is a multifunctional technology which is effective for the removal of such water constituents as iron, manganese, arsenic and ammonia. The in situ treatment can be applied efficiently for decentralised water supply. Within the framework of a research project, biofilms which play an important role in the in situ treatment will be localised, isolated and examined. Microorganisms will be identified and characterised in order to make the in situ treatment controllable regarding both planning and design of facilities, and to increase the efficiency of the technology. 相似文献
266.
Kathrin P. Lampert Ximena E. Bernal A. Stanley Rand Ulrich G. Mueller Michael J. Ryan 《Behavioral ecology and sociobiology》2006,59(6):796-804
In most sexually reproducing animals, the behavior of one or both sexes during courtship critically influences the success
at mating of the opposite sex. This behavior is often interpreted as “mate choice,” and there is great interest in why such
choices are exercised. The explanation for the evolution of mate choice that has received the most attention and generated
the most controversy is based on assumed genetic effects. In this study, we investigated whether female túngara frogs, which
choose mates based on acoustic cues, have a preference for genetically less related males. Specifically, we determine if there
is disassortive mating based on microsatellite markers, if there is information in the advertisement call that could be used
to assess genetic similarity, and if females exhibit acoustic-based mating preferences that would promote choice for genetic
diversity. Using seven microsatellite markers, we found no correlation of male call similarity and male genetic relatedness.
Female choice experiments showed no female preference for calls of less related males, and there was no evidence for inbreeding
avoidance in the field. Our results do not support the hypothesis of mate choice based on information about genetic relatedness
conveyed by acoustic signals in túngara frogs. 相似文献
267.
268.
Kirmizakis Panagiotis Doherty Rory Mendonça Carlos A. Costeira Ricardo Allen Chris C. R. Ofterdinger Ulrich S. Kulakov Leonid 《Environmental science and pollution research international》2019,26(10):9981-9991
Environmental Science and Pollution Research - Here, we show the electrical response, bacterial community, and remediation of hydrocarbon-contaminated groundwater from a gasworks site using a... 相似文献
269.
In order to avoid the occurrence of boar taint, castration of piglets without pain relief is a common practice in pork production. Due to increasing animal welfare concerns, the practice will be banned in organic agriculture from 2012 and alternative methods will have to be implemented. An important factor for the successful implementation of such alternatives is consumers’ acceptance of the methods, as consumers’ daily buying decisions are crucial to the further development of the organic pork sector. Thus, this paper explores organic consumers’ attitudes towards piglet castration without pain relief and three alternative methods and examines which aspects of these alternatives are important to consumers of organic products. The analysis of nine focus group discussions in Germany conducted in fall 2009 and involving a total of 89 participants, shows that castration without pain relief in organic farming was unacceptable for participants. Animal welfare, food safety, taste, and costs were principal aspects that participants used to assess the three alternatives. Participants had mainly favorable attitudes towards castration with anesthesia and analgesia. Although participants had some concerns regarding the fattening of boars (taste), there was openness towards this alternative due to its perceived naturalness. Immunocastration was seen quite critically because participants feared that this alternative might lead to (hormone) residues in meat. Overall, the results suggest that fattening of boars and castration with anesthesia and analgesia could be acceptable alternatives to consumers of organic pork. 相似文献
270.
Inhibition of gap junctional intercellular communication (GJIC) is affiliated with tumor promotion process and it has been employed as an in vitro biomarker for evaluation of tumor promoting effects of chemicals. In the present study we investigated combined effects of anthropogenic environmental contaminants 2,2′,4,4′,5,5′-hexachlorobiphenyl (PCB 153) and fluoranthene, cyanotoxins microcystin-LR and cylindrospermopsin, and extracts of laboratory cultures of cyanobacteria Aphanizomenon gracile and Cylindrospermopsis raciborskii, on GJIC in the rat liver epithelial cell line WB-F344. Binary mixtures of PCB 153 with fluoranthene and the mixtures of the two cyanobacterial strains elicited simple additive effects on GJIC after 30 min exposure, whereas microcystin-LR and cylindrospermopsin neither inhibited GJIC nor altered effects of PCB 153 or fluoranthene. However, synergistic effects were observed in the cells exposed to binary mixtures of anthropogenic contaminants (PCB 153 or fluoranthene) and cyanobacterial extracts. The synergistic effects were especially pronounced after prolonged (6-24 h) co-exposure to fluoranthene and A. gracile extract, when mixture caused nearly complete GJIC inhibition, while none of the individual components caused any downregulation of GJIC at the same concentration and exposure time. The effects of cyanobacterial extracts were independent of microcystin-LR or cylindrospermopsin, which were not detected in cyanobacterial biomass. It provides further evidence on the presence of unknown tumor promoting metabolites in cyanobacteria. Clear potentiation of the GJIC inhibition observed in the mixtures of two anthropogenic contaminants and cyanobacteria highlight the importance of combined toxic effects of chemicals in complex environmental mixtures. 相似文献