全文获取类型
收费全文 | 930篇 |
免费 | 9篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 27篇 |
废物处理 | 56篇 |
环保管理 | 94篇 |
综合类 | 144篇 |
基础理论 | 212篇 |
环境理论 | 2篇 |
污染及防治 | 303篇 |
评价与监测 | 55篇 |
社会与环境 | 59篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 2篇 |
2022年 | 15篇 |
2021年 | 17篇 |
2020年 | 8篇 |
2019年 | 8篇 |
2018年 | 29篇 |
2017年 | 36篇 |
2016年 | 37篇 |
2015年 | 31篇 |
2014年 | 29篇 |
2013年 | 95篇 |
2012年 | 47篇 |
2011年 | 75篇 |
2010年 | 56篇 |
2009年 | 55篇 |
2008年 | 66篇 |
2007年 | 53篇 |
2006年 | 49篇 |
2005年 | 32篇 |
2004年 | 30篇 |
2003年 | 33篇 |
2002年 | 19篇 |
2001年 | 9篇 |
2000年 | 6篇 |
1999年 | 6篇 |
1998年 | 8篇 |
1997年 | 9篇 |
1996年 | 4篇 |
1995年 | 13篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1987年 | 2篇 |
1981年 | 4篇 |
1965年 | 7篇 |
1964年 | 3篇 |
1963年 | 4篇 |
1962年 | 9篇 |
1961年 | 11篇 |
1958年 | 2篇 |
1957年 | 1篇 |
1956年 | 1篇 |
1954年 | 1篇 |
1947年 | 1篇 |
1942年 | 1篇 |
1941年 | 2篇 |
1938年 | 1篇 |
1932年 | 1篇 |
排序方式: 共有954条查询结果,搜索用时 406 毫秒
101.
Brain RA Wilson CJ Johnson DJ Sanderson H Bestari KJ Hanson ML Sibley PK Solomon KR 《Environmental pollution (Barking, Essex : 1987)》2005,138(3):425-442
The impact of a mixture of oxytetracycline, chlortetracycline, tetracycline and doxycycline on Myriophyllum sibiricum and Lemna gibba was investigated using fifteen 12,000-L microcosms (k=5, n=3). Significant concentration-response relationships were only found for M. sibiricum, where dry mass was 69, 47, 30, and 7% of controls at respective treatment concentrations of 0.080, 0.218, 0.668, and 2.289 micromol/L. Somatic endpoints were strongly and negatively correlated with percent light transmission, except plant length, which was positively correlated. Treated microcosms experienced a reduction in the percent of surface irradiance penetrating the water column as high as 99.8% at a depth of 70 cm, relative to controls. Position relative to the water column was likely responsible for the differential effects observed between floating (L. gibba) and submerged (M. sibiricum) species of macrophytes. A hazard quotient assessment of the lowest EC10 value indicated significant risk, exceeding the critical HQ value, but not the lowest EC25 value. 相似文献
102.
Thomas Meinelt Ralf Krüger Michael Pietrock Reiner Osten Christian Steinberg 《Environmental science and pollution research international》1997,4(1):32-36
From June 1993 to October 1994, studies have been carried out on the effects of mercury in the Oder River and pike tissue
contamination (muscle, kidney, liver). The mean mercury contents in the sediment range from 0.03 to 1.1 mg/kg dry weight.
In the pike muscle, between 0.22 and 0.85 mg/kg, on a wet weight basis, were found. The measured mercury concentrations were
analysed in relation to the number of macrophage centres of the liver, spleen and kidney of the pike. Positive correlations
between mercury and MC response (0.54 ≤ r ≤ 0.79, p < 0.05) were found in all of these organs. The suitability of the macrophage-centre-response
as a possible bioindicator for mercury pollution is discussed in the literature. In our study, the response of MCs was found
to be suitable as a biomarker for the impairment of fish health. 相似文献
103.
Rainer Brüggemann Andreas Kaune Laszlo Zelles Anton Hartmann Christian Steinberg 《Umweltwissenschaften und Schadstoff-Forschung》1995,7(5):265-274
Die ?kotoxikologie mu? sich mit biologischen Systemen und ihren Antworten auf schadstoffinduzierten Stre? auseinandersetzen.
Die hierzu verwendete experimentelle Technik eilt dabei den M?glichkeiten dynamischer, proze?orientierter mathematischer Modellierung
weit voraus.
In dieser methodisch orientierten Arbeit werden Techniken aus der mathematischen Disziplin der Verbandstheorie vorgestellt,
die eine Datenanalyse unter den Aspekten vergleichender Bewertung erlauben. Wichtige Ergebnisse sind dabei
相似文献
– | • Aussagen zur Diversit?t mikrobieller Systeme (soweit durch die hier verwendeten Muster von vier Phospholipidfetts?uren erfa?bar), |
– | • Analysen ordinaler Abh?ngigkeiten sowie |
– | • komprimierte Darstellung komplexer Befunde im Zusammenhang mit der Toxizit?t von Huminstoff-Chemikalien-Systemen. |
104.
105.
106.
107.
Christian Reichle Stefan Jarau Ingrid Aguilar Manfred Ayasse 《Die Naturwissenschaften》2010,97(5):519-524
The ability to learn food odors inside the nest and to associate them with food sources in the field is of essential importance for the recruitment of nestmates in social bees. We investigated odor learning by workers within the hive and the influence of these odors on their food choice in the field in the stingless bee Scaptotrigona pectoralis. During the experiments, recruited bees had to choose between two feeders, one with an odor that was present inside the nest during the recruitment process, and one with an unknown odor. In all experiments with different odor combinations (linalool/phenylacetaldehyde, geraniol/eugenol) a significant majority of bees visited the feeder with the odor they had experienced in their nest (χ 2-tests; p?<?0.05). By contrast, the bees showed no preference for one of two feeders when they were either baited with the same odor (linalool) or contained no odor. Our results clearly show that naïve workers of S. pectoralis can learn the odor of a food source during the recruitment process from the nest atmosphere and that their subsequent food search in the field is influenced by the learned odor. 相似文献
108.
Keeping the blood flowing—plasminogen activator genes and feeding behavior in vampire bats 总被引:1,自引:0,他引:1
Tellgren-Roth A Dittmar K Massey SE Kemi C Tellgren-Roth C Savolainen P Lyons LA Liberles DA 《Die Naturwissenschaften》2009,96(1):39-47
The blood feeding vampire bats emerged from New World leaf-nosed bats that fed on fruit and insects. Plasminogen activator,
a serine protease that regulates blood coagulation, is known to be expressed in the saliva of Desmodus rotundus (common vampire bat) and is thought to be a key enzyme for the emergence of blood feeding in vampire bats. To better understand
the evolution of this biological function, we studied the plasminogen activator (PA) genes from all vampire bat species in
light of their feeding transition to bird and subsequently mammalian blood. We include the rare species Diphylla ecaudata and Diaemus youngi, where plasminogen activator had not previously been studied and demonstrate that PA gene duplication observed in Desmodus is not essential to the vampire phenotype, but relates to the emergence of predominant mammalian blood feeding in this species.
Plasminogen activator has evolved through gene duplication, domain loss, and sequence evolution leading to change in fibrin-specificity
and susceptibility to plasminogen activator inhibitor-1. Before undertaking this study, only the four plasminogen activator
isoforms from Desmodus were known. The evolution of vampire bat plasminogen activators can now be linked phylogenetically to the transition in feeding
behavior among vampire bat species from bird to mammalian blood.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
109.
Vanesa Alzaga Paolo Tizzani Pelayo Acevedo Francisco Ruiz-Fons Joaquín Vicente Christian Gortázar 《Die Naturwissenschaften》2009,96(10):1157-1168
Deviance partitioning can provide new insights into the ecology of host-parasite interactions. We studied the host-related factors influencing parasite prevalence, abundance, and species richness in European brown hares (Lepus europaeus) from northern Spain. We defined three groups of explanatory variables: host environment, host population, and individual factors. We hypothesised that parasite infection rates and species richness were determined by different host-related factors depending on the nature of the parasite (endo- or ectoparasite, direct or indirect life cycle). To assess the relative importance of these components, we used deviance partitioning, an innovative approach. The explained deviance (ED) was higher for parasite abundance models, followed by those of prevalence and then by species richness, suggesting that parasite abundance models may best describe the host factors influencing parasitization. Models for parasites with a direct life cycle yielded higher ED values than those for indirect life cycle ones. As a general trend, host individual factors explained the largest proportion of the ED, followed by host environmental factors and, finally, the interaction between host environmental and individual factors. Similar hierarchies were found for parasite prevalence, abundance, and species richness. Individual factors comprised the most relevant group of explanatory variables for both types of parasites. However, host environmental factors were also relevant in models for indirect life-cycle parasites. These findings are consistent with the idea of the host as the main habitat of the parasite; whereas, for indirect life-cycle parasites, transmission would be also modulated by environmental conditions. We suggest that parasitization can be used not only as an indicator of individual fitness but also as an indicator of environmental quality for the host. This research underlines the importance of monitoring parasite rates together with environmental, population, and host factors. 相似文献
110.
I. Richard Schaffner Crystal L. Leavey Kevin J. Davis Daniel V. Takoushian Kaleigh Ewing 《补救:环境净化治理成本、技术与工艺杂志》2016,26(2):87-100
Residual dense nonaqueous phase liquid (DNAPL) composed of trichloroethene (TCE) was identified in a deeper interval of an overburden groundwater system at a manufacturing facility located in northern New England. Site hydrostratigraphy is characterized by two laterally continuous and transmissive zones consisting of fully‐saturated fine sand with silt and clay. The primary DNAPL source was identified as a former dry well with secondary contributions from a proximal aboveground TCE storage tank. A single additive‐injection mobilization in 2001 utilizing a food‐grade injectate formulated with waste dairy product and inactive yeast enhanced residual TCE DNAPL destruction in situ by stimulating biotic reductive dechlorination. The baseline TCE concentration was detected up to 97,400 μg/L in the deeper interval of the overburden groundwater system, and enhanced reductive dechlorination (ERD) achieved >99 percent reduction in TCE concentrations in groundwater over nine years with no evidence of sustained rebound. TCE concentrations have remained nondetect below 2.0 μg/L for the last five consecutive sampling rounds between 2013 and 2015. ERD utilizing a food‐grade injectate is a green remediation technology that has destroyed residual DNAPL at the site and achieved similar results at other residual DNAPL sites during both pilot‐ and full‐scale applications. ©2016 Wiley Periodicals, Inc. 相似文献