全文获取类型
收费全文 | 2349篇 |
免费 | 23篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 65篇 |
废物处理 | 177篇 |
环保管理 | 155篇 |
综合类 | 276篇 |
基础理论 | 484篇 |
环境理论 | 1篇 |
污染及防治 | 818篇 |
评价与监测 | 236篇 |
社会与环境 | 162篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 26篇 |
2022年 | 68篇 |
2021年 | 77篇 |
2020年 | 33篇 |
2019年 | 40篇 |
2018年 | 78篇 |
2017年 | 83篇 |
2016年 | 122篇 |
2015年 | 75篇 |
2014年 | 132篇 |
2013年 | 228篇 |
2012年 | 135篇 |
2011年 | 178篇 |
2010年 | 100篇 |
2009年 | 71篇 |
2008年 | 149篇 |
2007年 | 161篇 |
2006年 | 112篇 |
2005年 | 92篇 |
2004年 | 63篇 |
2003年 | 56篇 |
2002年 | 62篇 |
2001年 | 37篇 |
2000年 | 21篇 |
1999年 | 19篇 |
1998年 | 6篇 |
1997年 | 9篇 |
1996年 | 6篇 |
1995年 | 12篇 |
1994年 | 7篇 |
1993年 | 12篇 |
1992年 | 3篇 |
1991年 | 7篇 |
1990年 | 10篇 |
1989年 | 3篇 |
1988年 | 6篇 |
1983年 | 3篇 |
1975年 | 2篇 |
1967年 | 4篇 |
1966年 | 2篇 |
1964年 | 8篇 |
1963年 | 7篇 |
1962年 | 7篇 |
1960年 | 5篇 |
1959年 | 2篇 |
1958年 | 8篇 |
1957年 | 3篇 |
1956年 | 4篇 |
1955年 | 2篇 |
1943年 | 2篇 |
排序方式: 共有2378条查询结果,搜索用时 31 毫秒
931.
József Vuts Till Tolasch Lorenzo Furlan éva Bálintné Csonka Tamás Felf?ldi Károly Márialigeti Teodora B. Toshova Mitko Subchev Amália Xavier Miklós Tóth 《Chemoecology》2012,22(1):23-28
The presence of geranyl octanoate, previously found in pheromone gland extracts of Agriotes lineatus females, was also demonstrated in gland extracts of A. proximus females. Similar to A. lineatus, geranyl butanoate was present only in trace amounts in A. proximus female gland extracts. In air entrainment samples of female A. lineatus and A. proximus beetles, the relative ratio of geranyl butanoate and geranyl octanoate was higher than that in gland extracts. In addition,
comparison of a segment of the mitochondrial cytochrome c oxidase subunit I gene of feral specimens of A. lineatus and A. proximus showed >99% similarity. Both pheromone profile and nucleotide sequence analysis delineate close relationship between the
investigated taxa and postulate taxonomic revision. Further studies on sympatric populations of A. lineatus and A. proximus are underway to investigate and better understand possible processes of species diversification. 相似文献
932.
Hipólito Amanda Caretta Talita de Oliveira Silveira Victória Akemi Itakura Bersaneti Gabrielly Terassi Mali Suzana Celligoi Maria Antonia Pedrine Colabone 《Journal of Polymers and the Environment》2021,29(10):3199-3209
Journal of Polymers and the Environment - Sophorolipids are glycolipid biosurfactants produced by the yeast Starmerella bombicola. They have great potential for application in the food industry due... 相似文献
933.
Bioavailability and accumulation of trace elements in soils and plants of a highly contaminated estuary (Domingo Rubio tidal channel,SW Spain) 总被引:1,自引:0,他引:1
Madejón P Burgos P Murillo JM Cabrera F Madejón E 《Environmental geochemistry and health》2009,31(6):629-642
The Domingo Rubio tidal channel (Palos de la Frontera, Huelva, Spain) is an estuary located in the mouth of the Tinto River.
The estuary is affected by different sources of pollution (waters of the Tinto River, contaminated with trace elements from
the Iberian Pyrite belt, and effluent from the Huelva chemical industrial area). Soil and the most frequent plant species
were collected in 2004 and 2006 at six different locations on the estuary. In general, N-Kjedahl, Total Organic Carbon values,
salinity and contamination (total trace elements up to 1,000 mg kg−1 As, 6 mg kg−1 Cd, 2,500 mg kg−1 Cu, 1,900 mg kg−1 Pb and 1,300 mg kg−1 Zn) tended to increase downstream of the tidal channel. Soil biochemical properties were not negatively affected either by
the high salinity or by trace element contamination. Despite the high values of the trace elements, analysed plant samples
showed that Cu was the only metal that could be a serious risk for the food chain. 相似文献
934.
Rita Hargitai Kathryn E. Arnold Márton Herényi József Prechl János Török 《Behavioral ecology and sociobiology》2009,63(6):869-882
Offspring survival can be influenced by resources allocated to eggs, which in turn may be affected by the environmental factors
the mother experiences during egg formation. In this study, we investigated whether experimentally elevated social interactions
and number of neighbouring pairs influence yolk composition of collared flycatchers (Ficedula albicollis). Social challenge was simulated by presentation of a conspecific female. Experimental females spent more time near the cage
and produced eggs with higher androgen concentration, but local breeding density did not affect yolk androgen level. Moreover,
we found that females exposed to more intra-specific interactions and those that bred at higher density produced eggs with
smaller yolk. These females may be more constrained in foraging time due to more frequent social encounters, and there might
be increased competition for food at areas of higher density. In contrast, the present study did not reveal any evidence for
the effect of social environment on yolk antioxidant and immunoglobulin levels. However, we found that yolk lutein and immunoglobulin
concentrations were related to the female’s H/L ratio. Also, yolk lutein and α-tocopherol levels showed a seasonal increase
and were positively related to the female’s plasma carotenoid level. Mothers may incur significant costs by transferring these
compounds into the eggs, thus only females in good physiological condition and those that lay eggs later, when food is probably
more abundant, could allocate higher amounts to the eggs without compromising their defence mechanisms. Our results suggest
that environmental circumstances during egg formation can influence conditions for embryonic development. 相似文献
935.
Joan Navarro Lourdes López Marta Coll Claudio Barría Raquel Sáez-Liante 《Marine Biology》2014,161(7):1697-1707
Knowing the trophic ecology of marine predators is essential to develop an understanding of their ecological role in ecosystems. Research conducted on deep-sea and threatened shark species is limited. Here, by combining analyses of individual stomach contents and stable isotope values, we examined the trophic ecology (dietary composition and trophic position) of the kitefin shark Dalatias licha, a deep-sea shark considered as near threatened globally and as data deficient in the Mediterranean Sea. Results revealed the importance of small sharks in the diet of the kitefin shark at short- and long-term scales, although fin-fish, crustaceans and cephalopods were also found. Predation on sharks reveals the high trophic position of the kitefin shark within the food web of the western Mediterranean Sea. Stable isotope values from liver and muscle tissues confirmed our results from stomach content analysis and the high trophic position. 相似文献
936.
Melania C. López-Castro Karen A. Bjorndal George D. Kamenov Alan B. Bolten 《Marine Biology》2014,161(10):2269-2278
Many species of marine organisms go through ontogenetic shifts that occur in unknown or inaccessible locations. Finding these areas is crucial to understand connectivity and resilience of populations, both of which have conservation implications. When extrinsic markers are not suitable to track organisms, intrinsic markers can be useful to infer the location of inaccessible areas where these cryptic stages occur. Our study focuses on the location of oceanic foraging areas of the cryptic early juvenile stage of green turtles, Chelonia mydas, in the Atlantic. Due to the small size of hatchlings, the use of telemetry is limited to short periods of time and small spatial ranges, which do not allow determining the location of oceanic foraging areas. We used lead (Pb) stable isotopes to determine the possible location of oceanic foraging areas of small green turtles in the Atlantic Ocean. Pb stable isotope ratios in the scute tissue deposited when turtles were in the oceanic habitat were compared to ratios of major sources of lead in the Atlantic and oceanic areas in the Atlantic to determine the location of oceanic foraging grounds. The Pb isotope ratios in the scute of oceanic-stage green turtles indicated that turtles use different regions in the Atlantic and that they are capable of transatlantic migrations. We compare the oceanic locations identified by this study with those suggested by two previous studies. 相似文献
937.
Claudia Yared Michel-López Esaú Ruiz-Sánchez Roberto Zamora-Bustillos 《Chemistry and Ecology》2014,30(3):227-232
The effects of copper (Cu2+) on photochemical efficiency, cellular viability and total phenolic content in Prosopis glandulosa leaves were evaluated after 4, 8 or 12 h exposure to 0.1, 10 or 100 mM Cu2+ using the tissue tolerance test. The results showed that significant reductions (p<0.003) of photochemical efficiency in P. glandulosa leaves were found after 8 h exposure to 100 mM Cu2+ compared with controls leaves. The results also showed a significant increase (p<0.05) on electrolyte leakage values in P. glandulosa leaves after 4 h exposure to 100 mM Cu2+ compared with control leaves. Total phenolic content in P. glandulosa leaves only differed significantly when exposed 12 h to the highest concentration of Cu2+. These results suggest that Cu2+ can produce reactive oxygen species that may form hydroxyl radicals that damage proteins and lipids, which in turn causes loss of integrity and reduce photochemical efficiency of leaves. In conclusion, the photochemical efficiency and cellular viability analyses can be used as useful physiological tools to assess early changes in photosynthetic performance of P. glandulosa in response to copper pollution. 相似文献
938.
Carlos Rosano-Peña Patricia Guarnieri André Luiz Marques Serrano Herbert Kimura 《国际发展与全球生态学杂志》2014,21(3):210-222
The social and environmental impacts caused by the modernization of Brazilian agribusiness have evoked a growing interest in the search of balance between social-economics development and the adequate use of natural resources, driving the country to sustainable development. Therefore, the main aim of this article is to estimate a set of indicators of relative efficiency in the Brazilian agricultural sector, which satisfy the concept of Pareto optimality, potentiates simultaneously both economic, ecological dimensions and social functions. To reach this purpose, the method of directional distance functions and data envelopment analysis was applied. These indicators confirm, in different ways, the hypothesis that it is possible to perform consistent productive strategies with the maximization of social welfare, despite the apparent antagonism among these three dimensions. In addition, it is shown that efficient Brazilian states tend to combine the three dimensions in different ways. Hence, it can be concluded that several equilibrium taken sustainable can be achieved through different actions on poverty and environmental impact reduction without necessarily generating productive inefficiencies. This result can be considered of prominent importance for sustainable development in Brazil and can also serve as a reference in the definition of goals of the plan ‘Brazil without Misery’ and international commitments to reduce Greenhouse Gas – GHG – in Brazil, especially for the 17 inefficient Brazilian states. 相似文献
939.
940.
Edelmira García-Nieto Libertad Juárez-Santacruz Elvia Ortiz-Ortiz Héctor Santos Luna-Zendejas Dora María Frías-Márquez Hipólito Muñoz-Nava 《Chemistry and Ecology》2019,35(4):300-318
This study assesses the potential risk of Texcalac River and riparian area. The p,p′ DDT and ∑DDTs levels in agricultural soils (3.9–208.0?µg/kg) and in surface sediments (0.6–137?µg/kg) surpassing the guidelines for protection of aquatic life (75% > TEC). The ∑PCBs concentration oscillated from 135 to 93941?µg/kg; the half of sediments exceeded the international guidelines (PEL, PEC), as well as two soils (SQGE?=?500?µg/kg). The TEQ concentration of four PCB-DL varied between 0.1 and 24.9?µg TEQ/kg, chiefly affected by PCB 169. Five sediments were lethal for E. foetida, two resulted to be cytotoxic and the 58% produced genotoxicity higher than negative control (A?=?0.28?±?0.05; DICA?=?72.5?±?16.9 au). Likewise, 31.6% of samples increased the micronuclei frequency in V. faba in comparison with negative control. The analytical data and the bioassays results suggest a significant and immediate risk to exposed biota of this region, highlighting a specific area in Texcalac River and other one in Sambrano Ravine. It is necessity assess the dispersion of pollutants and perform biomonitoring studies that display the exposure levels in biota with the goal to characterise the ecotoxicological risk. 相似文献