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排序方式: 共有316条查询结果,搜索用时 62 毫秒
191.
Elshanbary Alaa Ahmed Awad Alaa Abdelsameia Abdelsalam Alaa Ibrahim Islam H. Abdel-Aziz Walid Darwish Youssef Bahaaeldin Isa Alaa Saad Drid Boutheyna Mustafa Marwa Gamal Allam Radwa Hamdy Abo Ali Amira A. Nourelden Anas Zakarya Ragab Khaled Mohamed AlGwaiz Hussah I. M. Awaji Aeshah A. Germoush Mousa O. Albrakati Ashraf Piscopo Marina Ghaboura Nehmat Zaazouee Mohamed Sayed 《Environmental science and pollution research international》2022,29(32):47931-47941
Environmental Science and Pollution Research - Sentinel lymph node (SLN) sampling is important for evaluating the nodal stage of breast cancer when the axillary nodes are clinically free of... 相似文献
192.
Honscha Laiz Coutelle Penteado Julia Oliveira de Sá Gama Valério da Silva Bonifácio Alícia Aikawa Priscila dos Santos Marina Baisch Paulo Roberto Martins Muccillo-Baisch Ana Luíza da Silva Júnior Flavio Manoel Rodrigues 《Environmental science and pollution research international》2022,29(10):14176-14184
Environmental Science and Pollution Research - Coal exploration and burning activities are among the activities with the greatest potential to cause atmospheric pollution due to the combustion... 相似文献
193.
Maja A. Shishovska Vera P. Trajkovska Marina T. Stefova 《Journal of environmental science and health. Part. B》2013,48(7):694-701
An isocratic High Performance Liquid Chromatographic (HPLC) method was optimized for 3-phenoxybenzyl (1RS)-cis-trans-3-(2,2-dichlorovinyl)-2,2-dimethyl-cyclopropanecarboxylate (permethrin) residues identification and quantification in wine matrix. Analytical reverse phase (RP) C-18 column was used (25 cm × 4 mm i.d., 5 μ m) with mobile phase consisting of acetonitrile and water in ratio 70 %/30 % (v v?1), flow-rate 2.0 mL min?1, UV-detection at 215 nm and controlled oven temperature at 25°C. The peaks of isomers were identified with the retention times as compared to standard cis-/trans- mixture and confirmed with characteristic spectra using photodiode array detector. Under these conditions, permethrin isomers were well separated with resolution 2.8 and no interference with the naturally present wine compounds was observed. The method was validated for linearity, precision, accuracy, limit of detection (LOD) and limit of quantification (LOQ). Linear regression analysis data proved a good linear relationship (correlation coefficients, r2, for cis- and trans-isomer are: 0.9995 and 0.9997, respectively) between response of the detector and concentration of permethrin isomers over a wide concentration range for both isomers (0.55 mg L?1 ?4.40 mg L?1). Experimental data showed mean recoveries between 93.95% and 96.58% with RSD values in range: 0.89% ?3.69%. The effect of ethanol content in the solvent on permethrin isomers peak areas was also studied and 60% v v?1 ethanol was found to be optimal for sample preparation. The method was successfully tested on 20 commercial wine samples from the market in which no permethrin was detected. Thus, it was proved that it is suitable for routine permethrin residues analysis. The proposed method is suitable for routine analysis because of the simple sample preparation, acceptable run-time, low cost and its applicability with conventional instruments. 相似文献
194.
195.
Several investigations were carried out on biotic and abiotic samples to determine the difference between Chernobyl and preChernobyl environmental radiocontamination of the Adriatic Sea. Special emphasis was put on the determination of 137Cs which resulted in the most abundant radionuclide in a wide variety of samples (sea water, sediment, pelagic and benthic species). Attention was also given to the neutron activation products 110mAg and 134Cs that were first discovered in the Adriatic ecosystem after the Chernobyl event in particular, although the 110Ag fallout deposition over the area was neglected in comparison to that of 137Cs, its bioaccumulation in macroalgae and molluscs was much higher suggesting some particular physiological accumulation mechanism. 相似文献
196.
Marina?Fontaine Alice?Carravieri Beno?t?Simon-Bouhet Paco?Bustamante Nicolas?Gasco Frédéric?Bailleul Christophe?Guinet Yves?CherelEmail author 《Marine Biology》2015,162(1):207-219
The food and feeding ecology of the poorly known southern long-finned pilot whale (Globicephala melas edwardii) was investigated using ecological tracers (muscle and skin δ13C and δ15N, and total mercury, Hg) on individuals from two mass strandings together with at-sea observations of live animals in Kerguelen waters, southern Indian Ocean. Sightings of cetaceans from longliners over 9 years (2003–2012) emphasized the regular occurrence of pilot whales in slope waters surrounding the archipelago. Tissue δ13C values (a proxy of consumer foraging habitat) suggest that pilot whales fed in slope waters and in oceanic subantarctic waters over the last months preceding stranding. Tissue δ15N values and Hg concentration (dietary proxies) indicate a high trophic position (~4.7) for the pilot whales, likely corresponding to a mixed diet of fish and squid (not crustaceans) of undetermined species. Both skin and muscle Hg concentrations were positively and linearly correlated to individual size with no concomitant δ15N changes, which can be interpreted as a progressive Hg accumulation in tissues of individuals throughout life with no parallel dietary shift. Skin and muscle Hg concentrations were linearly and positively related; hence, Hg skin could be used as a proxy of Hg concentration in muscle (a main Hg reservoir of the body). Kerguelen southern long-finned pilot whales were less Hg contaminated than most pilot whale populations studied so far, thus suggesting that they are not at a high risk to Hg-induced damages in the remote islands of the Southern Ocean. 相似文献
197.
Octavio Cota-Arriola Mario Onofre Cortez-Rocha Josafat Marina Ezquerra-Brauer Jaime Lizardi-Mendoza Armando Burgos-Hernández Rosario Maribel Robles-Sánchez Maribel Plascencia-Jatomea 《Journal of Polymers and the Environment》2013,21(4):971-980
Recent studies have demonstrated the antibacterial effect of micro and nanoparticles of chitosan (CS) crosslinked with sodium tripolyphosphate (TPP), and incorporating metallic ions, bringing that the size, shape, and zeta potential are related to the antimicrobial potential. However, there are few studies on the antifungal activity and the effect of TPP on the antimicrobial potential. Micro and nanoparticles were prepared from CS by ionotropic gelation with TPP, and structurally characterized by transmission and scanning electron spectroscopy, and Fourier transformed infrared spectroscopy. Depending on the concentration of CS and TPP, spherical particles were obtained from 80 nm to 20 μm. Subsequently, particles were evaluated for their antifungal potential against Aspergillus parasiticus assessing radial growth, spore germination, and morphological changes. An increase in the antifungal potential compared with CS in solution was observed, inhibiting the development of the fungus causing clear morphological changes in both, hyphae and spores. Particle size and the availability of functional groups of CS/TPP (amino group and phosphate), suggest a possible synergistic effect between CS and TPP. 相似文献
198.
199.
M. Carla de Aranzamendi Ricardo Sahade Marcos Tatián Marina B. Chiappero 《Marine Biology》2008,154(5):875-885
The limpet Nacella concinna (Strebel 1908) was the focus of numerous studies dealing with Antarctic benthos. One of the main characteristics of the species
is the presence of two distinguishable morphotypes, one inhabiting the intertidal (during summer) and the other inhabiting
the subtidal. For a long time these forms were considered as an expression of phenotypic plasticity, since previous studies
did not found genetic differences between them. In the present work, we performed both a morphometric and a genetic differentiation
analysis (using ISSR-PCR markers) of these two forms in three stations sampled at Potter Cove, South Shetland Islands. The
results confirmed the morphological differences between intertidal and subtidal forms reported in other Antarctic localities.
The genetic differences detected indicate that the two forms can be considered as genetically distinct populations maintaining
low levels of gene flow. The degree of reproductive isolation of the ecotypes is discussed, as well as the possible origin
of the divergence. The genetic differentiation observed can also have behavioral and physiological correlates, pointing out
the importance of taking into account the potential differences in the response of both populations to different conditions
in future studies in this species.
M. C. de Aranzamendi and R. Sahade contributed equally to this paper. 相似文献