全文获取类型
收费全文 | 38篇 |
免费 | 0篇 |
专业分类
废物处理 | 1篇 |
环保管理 | 1篇 |
综合类 | 30篇 |
基础理论 | 2篇 |
污染及防治 | 2篇 |
评价与监测 | 2篇 |
出版年
2020年 | 1篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2012年 | 2篇 |
2011年 | 2篇 |
2010年 | 2篇 |
2009年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1998年 | 2篇 |
1996年 | 4篇 |
1994年 | 1篇 |
1990年 | 1篇 |
1984年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1965年 | 1篇 |
1955年 | 3篇 |
1952年 | 1篇 |
1946年 | 1篇 |
1924年 | 1篇 |
排序方式: 共有38条查询结果,搜索用时 15 毫秒
11.
12.
Occurrence and distribution of organophosphorus flame retardants and plasticizers in anthropogenically affected groundwater 总被引:1,自引:0,他引:1
Regnery J Püttmann W Merz C Berthold G 《Journal of environmental monitoring : JEM》2011,13(2):347-354
Occurrence and distribution of chlorinated and non-chlorinated organophosphates in 72 groundwater samples from Germany under different recharge/infiltration conditions were investigated. Tris(2-chloro-1-methylethyl) phosphate (TCPP) and tris(2-chloroethyl) phosphate (TCEP) were the most frequently detected organophosphates in groundwater samples. Highest individual organophosphate concentrations (>0.1 μg L(-1)) were determined in groundwater polluted by infiltrating leachate and groundwater recharged via riverbank filtration of organophosphate-loaded recipients. In samples from springs and deep groundwater monitoring wells that are not affected by surface waters, organophosphate concentrations were mostly below the limit of detection. The occurrence (3-9 ng L(-1)) of TCPP and TCEP in samples from aquifers with groundwater ages between 20 and 45 years indicates the persistence of both compounds within the aquifer. At urban sites organophosphate-loaded precipitation, surface runoff, and leakage of wastewater influenced groundwater quality. For rural sites, where groundwater recharge is only influenced by precipitation, organophosphates were very rarely detectable in groundwater. 相似文献
13.
Mature male dab (Limanda limanda) acclimated at 10° and 16°C were orally administered a single dose of 0.5 mg/kg 3,3′,4,4′-tetrachlorobiphenyl (CB77). At both temperatures, levels of cytochrome P450 1A (CYP1A) protein and 7-ethoxyresorufin O-deethylase (EROD) activity showed a two to six fold induction 40 days after CB77 treatment compared to control groups. Maximum responses of both EROD activity and CYP1A protein for the warm-acclimated fish were observed at 5 days after treatment. For the cold-acclimated fish a slow, progressive elevation for both EROD activity and CYP1A protein was observed and maximum responses were measured 40 days after treatment. Absolute EROD activity and CYPIA protein levels of fish from both temperatures were equally high at 40 days after treatment. Since in the control groups EROD activity and CYP1A protein levels were higher in the cold-acclimated fish, the magnitude of induction was higher in the warm acclimated ones. The highest concentrations of CB77 in muscle of fish from both temperatures were found at 5 and 10 days after treatment. The liver somatic index (LSI) showed 1.5 fold significantly higher values for the fish acclimated at 10°C. 相似文献
14.
15.
Martin Volk Sven Lautenbach Hedwig van Delden Lachlan T. H. Newham Ralf Seppelt 《Environmental management》2010,46(6):834-849
This article analyses the benefits and shortcomings of the recently developed decision support systems (DSS) FLUMAGIS, Elbe-DSS,
CatchMODS, and MedAction. The analysis elaborates on the following aspects: (i) application area/decision problem, (ii) stakeholder
interaction/users involved, (iii) structure of DSS/model structure, (iv) usage of the DSS, and finally (v) most important
shortcomings. On the basis of this analysis, we formulate four criteria that we consider essential for the successful use
of DSS in landscape and river basin management. The criteria relate to (i) system quality, (ii) user support and user training,
(iii) perceived usefulness and (iv) user satisfaction. We can show that the availability of tools and technologies for DSS
in landscape and river basin management is good to excellent. However, our investigations indicate that several problems have
to be tackled. First of all, data availability and homogenisation, uncertainty analysis and uncertainty propagation and problems
with model integration require further attention. Furthermore, the appropriate and methodological stakeholder interaction
and the definition of ‘what end-users really need and want’ have been documented as general shortcomings of all four examples
of DSS. Thus, we propose an iterative development process that enables social learning of the different groups involved in
the development process, because it is easier to design a DSS for a group of stakeholders who actively participate in an iterative
process. We also identify two important lines of further development in DSS: the use of interactive visualization tools and
the methodology of optimization to inform scenario elaboration and evaluate trade-offs among environmental measures and management
alternatives. 相似文献
16.
17.
18.
19.
20.
The neural mechanisms underlying cricket singing behavior have been the focus of several studies, but the central pattern
generator (CPG) for singing has not been localized conclusively. To test if the abdominal ganglia contribute to the singing
motor pattern and to analyze if parts of the singing CPG are located in these ganglia, we systematically truncated the abdominal
nerve cord of fictively singing crickets while recording the singing motor pattern from a front-wing nerve. Severing the connectives
anywhere between terminal ganglion and abdominal ganglion A3 did not preclude singing, although the motor pattern became more
variable and failure-prone as more ganglia were disconnected. Singing terminated immediately and permanently after transecting
the connectives between the metathoracic ganglion complex and the first unfused abdominal ganglion A3. The contribution of
abdominal ganglia for singing pattern generation was confirmed by intracellular interneuron recordings and current injections.
During fictive singing, an ascending interneuron with its soma and dendrite in A3 depolarized rhythmically. It spiked 10 ms
before the wing-opener activity and hyperpolarized in phase with the wing-closer activity. Depolarizing current injection
elicited rhythmic membrane potential oscillations and spike bursts that elicited additional syllables and reliably reset the
ongoing chirp rhythm. Our results disclose that the abdominal ganglion A3 is directly involved in generating the singing motor
pattern, whereas the more posterior ganglia seem to provide only stabilizing feedback to the CPG circuit. Localizing the singing
CPG in the anterior abdominal neuromeres now allows analyzing its circuitry at the level of identified interneurons in subsequent
studies. 相似文献