全文获取类型
收费全文 | 283篇 |
免费 | 4篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 17篇 |
废物处理 | 24篇 |
环保管理 | 31篇 |
综合类 | 29篇 |
基础理论 | 51篇 |
环境理论 | 1篇 |
污染及防治 | 106篇 |
评价与监测 | 18篇 |
社会与环境 | 11篇 |
出版年
2023年 | 7篇 |
2022年 | 7篇 |
2021年 | 7篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 14篇 |
2017年 | 11篇 |
2016年 | 12篇 |
2015年 | 14篇 |
2014年 | 14篇 |
2013年 | 26篇 |
2012年 | 16篇 |
2011年 | 24篇 |
2010年 | 12篇 |
2009年 | 10篇 |
2008年 | 16篇 |
2007年 | 18篇 |
2006年 | 11篇 |
2005年 | 20篇 |
2004年 | 15篇 |
2003年 | 4篇 |
2002年 | 4篇 |
2001年 | 6篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1982年 | 1篇 |
1974年 | 1篇 |
1963年 | 1篇 |
1961年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有288条查询结果,搜索用时 156 毫秒
141.
dos Santos Costa Rafaela Quadra Gabrielle Rabelo de Oliveira Souza Helena do Amaral Viviane Souza Navoni Julio Alejandro 《Environmental science and pollution research international》2021,28(31):41638-41650
Environmental Science and Pollution Research - Cyanobacteria are important for ecosystem functioning, but eutrophication may affect the surrounding biome by losing ecosystem services and/or through... 相似文献
142.
143.
Virginie Marques Paul Castagné Andréa Polanco Fernández Giomar Helena Borrero-Pérez Régis Hocdé Pierre-Édouard Guérin Jean-Baptiste Juhel Laure Velez Nicolas Loiseau Tom Bech Letessier Sandra Bessudo Alice Valentini Tony Dejean David Mouillot Loïc Pellissier Sébastien Villéger 《Conservation biology》2021,35(6):1944-1956
Assessing the impact of global changes and protection effectiveness is a key step in monitoring marine fishes. Most traditional census methods are demanding or destructive. Nondisturbing and nonlethal approaches based on video and environmental DNA are alternatives to underwater visual census or fishing. However, their ability to detect multiple biodiversity factors beyond traditional taxonomic diversity is still unknown. For bony fishes and elasmobranchs, we compared the performance of eDNA metabarcoding and long-term remote video to assess species’ phylogenetic and functional diversity. We used 10 eDNA samples from 30 L of water each and 25 hr of underwater videos over 4 days on Malpelo Island (pacific coast of Colombia), a remote marine protected area. Metabarcoding of eDNA detected 66% more molecular operational taxonomic units (MOTUs) than species on video. We found 66 and 43 functional entities with a single eDNA marker and videos, respectively, and higher functional richness for eDNA than videos. Despite gaps in genetic reference databases, eDNA also detected a higher fish phylogenetic diversity than videos; accumulation curves showed how 1 eDNA transect detected as much phylogenetic diversity as 25 hr of video. Environmental DNA metabarcoding can be used to affordably, efficiently, and accurately census biodiversity factors in marine systems. Although taxonomic assignments are still limited by species coverage in genetic reference databases, use of MOTUs highlights the potential of eDNA metabarcoding once reference databases have expanded. 相似文献
144.
Lopes Jéssica Costa Silva Bruno Garcia Dias Maria Eduarda Simões Carneiro Rodrigo Braz Damianovic Márcia Helena Rissato Zamariolli Foresti Eugenio 《Environmental science and pollution research international》2023,30(5):11755-11768
Environmental Science and Pollution Research - The nutrient biological removal from sewage, especially from anaerobic reactor effluents, still represents a major challenge in conventional sewage... 相似文献
145.
Roger Hoel Bello Poliana Linzmeyer Cláudia Maria Bueno Franco Ozair Souza Noeli Sellin Sandra Helena Westrupp Medeiros Cintia Marangoni 《Waste management (New York, N.Y.)》2014,34(8):1501-1509
Banana waste has the potential to produce ethanol with a low-cost and sustainable production method. The present work seeks to evaluate the separation of ethanol produced from banana waste (rejected fruit) using pervaporation with different operating conditions. Tests were carried out with model solutions and broth with commercial hollow hydrophobic polydimethylsiloxane membranes. It was observed that pervaporation performance for ethanol/water binary mixtures was strongly dependent on the feed concentration and operating temperature with ethanol concentrations of 1–10%; that an increase of feed flow rate can enhance the permeation rate of ethanol with the water remaining at almost the same value; that water and ethanol fluxes was increased with the temperature increase; and that the higher effect in flux increase was observed when the vapor pressure in the permeate stream was close to the ethanol vapor pressure. Better results were obtained with fermentation broth than with model solutions, indicated by the permeance and membrane selectivity. This could be attributed to by-products present in the multicomponent mixtures, facilitating the ethanol permeability. By-products analyses show that the presence of lactic acid increased the hydrophilicity of the membrane. Based on this, we believe that pervaporation with hollow membrane of ethanol produced from banana waste is indeed a technology with the potential to be applied. 相似文献
146.
Coupled bio-physical models of larval dispersal predict that the Costa Rica–Panama (CR–PAN) reefs should constitute a demographically
isolated region in the western Caribbean. We tested the hypothesis that CR–PAN coral reef fish populations would be isolated
from Mesoamerican Barrier Reef System (MBRS) populations. To test that, we assessed population genetic structure in bicolor
damselfish (Stegastes partitus) from both regions. Adult fish were genotyped from five reefs in CR–PAN and from four reefs along the MBRS at 12 microsatellite
loci. Between-region F
ST (F
ST = 0.0030, P < 0.005) and exact test (x
2 = 74.34, df = 18, P < 0.0001) results indicated that there is weak but significant genetic differentiation between regions, suggesting some restriction
in connectivity along the Central American coastline, as predicted by bio-oceanographic models. Additionally, there is among-site
genetic structure in the CR–PAN region, relative to the MBRS and between regions, suggesting higher self-recruitment within
CR–PAN. This finding may be explained by differences in habitat characteristics. 相似文献
147.
Rui Rosa Marta S. Pimentel Miguel Baptista Katja Trübenbach Ricardo Calado Maria L. Nunes Ana Moreno João Pereira 《Marine Biology》2013,160(2):263-275
The present study provides a comprehensive analysis of the biochemical composition (proximate composition, amino acids and fatty acids in gonad, digestive gland and muscle) of the cirrate octopod, Opisthoteuthis calypso, collected off the coast of Portugal. Protein and energy contents of O. calypso were significantly lower (p < 0.05) than those observed for coastal octopods, suggesting that the gelatinous musculature of the cirrate octopus may not be a direct consequence of food limitation, but rather associated with reduced selective pressure for strong swimming ability in the deep sea. Moreover, principal component analyses of fatty acid (FA) data clearly separated coastal octopods from O. calypso. Saturated FA biomarkers (namely 16:0, 17:0, 18:0) and monounsaturated FA 22:1 suggest a higher phytodetrital influence on diet of O. calypso. A clear separation between groups was also observed with amino acid (AA) data. However, essential AA and non-essential AA designations (based on the flow of carbon through biochemical systems) do not necessarily provide an accurate picture of the origins of amino nitrogen in the deep-sea environment. Consequently, the interpretation of the present data is a challenging task but opens a new window of opportunity to unravel new trophic biomarkers in the deep sea. 相似文献
148.
Furcellaria lumbricalis is a red algae occurring in low salinity to fully marine conditions. Here, both putatively neutral and EST-derived microsatellite
markers were developed and used to examine the genetic structure of northern European populations inhabiting different salinity
conditions ranging from 35 to 3.6 psu. The amount of genetic variation did not differ between ocean and brackish populations,
but differences were observed between marker types; EST-derived markers possessed less variation and showed greater differentiation
than the putatively neutral microsatellites. No multicopy multilocus genotypes were detected despite expected asexuality in
brackish populations. The Bayesian STRUCTURE analysis, when conducted for expressed marker data, indicated the presence of
two main clusters, the Atlantic Ocean and Baltic Sea, while no clear structuring was observed based on putatively neutral
microsatellites. The moderate level of genetic differentiation at neutral loci is probably due to genetic drift, a feasible
explanation considering long distances between many populations, while the high level of differentiation in EST-linked markers
reflects selection pressures. 相似文献
149.
Escalation theory proposes enemy-related selection as the most relevant factor of natural selection among individual organisms.
When hazardous to predators, prey might be considered enemies that influence predator evolution. Opisthobranch molluscs that
prey on chemically defended prey are an interesting study case on this subject. Predation on chemically defended species paved
the way for opisthobranchs to enter in an arms race, developing means to detoxify and/or excrete harmful compounds, which
led to the sequestration of those compounds and their self-defensive use, an escalation of defenses. Here we aim to understand
whether the opisthobranch predator is better protected than its chemically defended prey, using as predator–prey model, a
nudibranch (Hypselodoris
cantabrica) and the sponge it preys upon (Dysidea fragilis), and from which it obtains deterrent chemical compounds. Specimens of both species were collected on the Portuguese coast,
and their crude extracts were analyzed and used in palatability tests. Nudibranchs revealed a higher natural concentration
of crude extract, probably due to a progressive accumulation of the compounds. Both predator and prey extracts revealed similar
mixtures of deterrent metabolites (furanosesquiterpenes). Palatability tests revealed a more effective deterrence in the nudibranch
extracts because significant rejection rates were observed at lower concentrations than those necessary for the sponge extracts
to have the same effect. We concluded that the predator is chemically better protected than its prey, which suggests that
its acquisition of chemical defenses reveals a defensive escalation. 相似文献
150.
Increasing interest for recreational SCUBA diving worldwide is raising the concern about its potential effects on marine ecosystems. Available literature is still much focused either on impacts on coral reefs of tropical regions or on diver’s behaviour underwater. In this study we analysed, through photo-quadrats, the benthic community composition in a section of a decommissioned Portuguese navy ship that was sunk for touristic purposes. The ship broke down and became separated in two sections enabling a Control versus Impact sampling design, as one section is less attractive for diving. Gorgonians (mainly belonging to the species Leptogorgia sarmentosa and Eunicella verrucosa) were the taxa more negatively affected in the dived ship section, with smaller coverage and size. More resilient species such as the acorn barnacle Amphibalanus amphitrite were positively correlated with the Impact samples. In the case of the study area, according to the available data, 70% or more of the total amount of dives are now on the sunken ships. From these results, lessons can be taken to apply on natural reefs and related management plans. 相似文献