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21.
Phaseolus vulgaris L. cv. Black Valentine when sprayed with Corexit dispersants shows a rapid inhibition of photosynthesis. The plant retains the ability to translocate fixed carbon, and this involves mobilising previously fixed carbon in the sprayed leaf or the repartitioning of carbon from unsprayed regions of the plant towards the growing sink regions. The ability to maintain carbon translocation while photosynthesis is declining maximises the regrowth potential of the plant. 相似文献
22.
Larval and post-larval crab distribution was surveyed in three different habitats in Kachemak Bay, Alaska to determine temporal
and spatial variability. Distribution varied temporally and spatially from June 2005 to September 2006. Nine sites of varying
habitat complexity were surveyed monthly using scuba surveys and light traps to measure habitat variables and quantify crab
zoeae and megalopae. A total of 10,016 crabs belonging to seven families were identified. Four species comprised the majority
(97%) of the total crab assemblages and included Cancer oregonensis, Fabia subquadrata, Telmessus cheiragonus, and Pugettia gracilis. Peak abundances occurred in summer but varied on small temporal scales with species. No single bay-wide variable determined
the appearance of all species. Depending on species, appearance may be influenced by seasonality of environmental variables.
Spatially, highest abundances occurred in habitats with less structural complexity. Spatial differences in crab abundance
may have resulted from variability on large scale physical transport mechanisms and not kelp-mediated flow alterations. 相似文献
23.
24.
Some heavy metals have been determined using voltammetry in freshwaters forming part of a karstic hydrological system (the Timavo River, north of Trieste), during attempts to characterize and discriminate the different sources of the springs. The trace elements can be considered natural markers, with lead appearing to be the most discriminating variable. Non parametric statistics and cluster analysis were used to estimate the significance of the determined parameters with respect to the considered ecosystem. 相似文献
25.
Distribution and mobility of metals in contaminated sites. chemometric investigation of pollutant profiles 总被引:8,自引:0,他引:8
Abollino O Aceto M Malandrino M Mentasti E Sarzanini C Barberis R 《Environmental pollution (Barking, Essex : 1987)》2002,119(2):177-193
The distribution and mobility of heavy metals in the soils of two contaminated sites in Piedmont (Italy) was investigated, evaluating the horizontal and vertical profiles of 15 metals, namely Al, Cd, Cu, Cr, Fe. La, Mn, Ni, Pb, Sc, Ti, V, Y, Zn and Zr. The concentrations in the most polluted areas of the sites were higher than the acceptable limits reported in Italian and Dutch legislations for soil reclamation. Chemometric elaboration of the results by pattern recognition techniques allowed us to identify groups of samples with similar characteristics and to find correlations among the variables. The pollutant mobility was studied by extraction with water, dilute acetic acid and EDTA and by applying Tessier's procedure. The fraction of mobile species, which potentially is the most harmful for the environment, was found to be higher than the one normally present in unpolluted soils, where heavy metals are, to a higher extent, strongly bound to the matrix. 相似文献
26.
27.
Walter A. Korfmacher Kenneth R. Rowland Ronald K. Mitchum James J. Daly Robert C. McDaniel Michael V. Plummer 《Chemosphere》1984,13(11):1229-1233
Several snake tissue samples and one set of snake eggs were collected and analyzed for 2,3,7,8-tetrachlorodibenzo--dioxin. The isomer-specific analysis was performed using fused silica GC combined with atmospheric pressure ionization MS. The results ranged from a low of 38 parts-per-trillion (ppt) to high levels over 500 ppt. 相似文献
28.
Gary D. Bishop M. Robbins Church Christopher Daly 《Journal of the American Water Resources Association》1998,34(1):159-166
ABSTRACT: We evaluated maps of runoff created by means of two automated procedures. We implemented each procedure using precipitation estimates of both 5-km and 10-km resolution from PRISM (Parameter-elevation Regressions on Independent Slopes Model). Our goal was to determine if using the 5-km PRISM estimates would improve map accuracy. Visual inspection showed good general agreement among our runoff maps, as well as between our maps and one produced using a manual method. A quantitative uncertainty analysis comparing runoff interpolated from our maps with gage data that had been withheld showed slightly smaller actual and percentage interpolation errors for the 5-km PRISM-based maps. Our analyses suggest a modest region-wide improvement in runoff map accuracy with the use of PRISM-based precipitation estimates of 5-km (compared to 10-km) resolution. 相似文献
29.
Marina Monini Edoardo Vignolo Giovanni Ianiro Fabio Ostanello Franco Maria Ruggeri Ilaria Di Bartolo 《Food and environmental virology》2016,8(4):283-288
Torque teno viruses (TTV) are small DNA viruses widespread among humans and pigs. The clinical significance of TTV infections in either humans or pigs is uncertain. In fact, TTV viremia is highly prevalent in patients with different pathologies, but it can also be frequently observed in healthy subjects. Virus infection in pigs is considered a putative cofactor in several diseases; despite being detected frequently in healthy animals, its role still remains unknown. The present study aimed to investigate the presence of Torque teno sus virus (TTSuV) in 62 bile samples collected from pigs at slaughterhouse and in 36 fresh pork liver sausages bought at point of sale. Quantitative Real-Time PCR, confirmed that 19.4 and 58.3 % of bile and sausage samples tested positive for TTSuV, respectively. The mean viral load was established as 5.6 × 104 GE/µl for bile and 7.16 × 103 GE/g for sausages. TTSuV nucleotide sequence analysis confirmed a wide heterogeneity among the circulating TTSuV strains, which included both TTSuV1 and TTSuV2. 相似文献
30.
Herman Daly 《Conservation biology》2009,23(2):252-253