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排序方式: 共有296条查询结果,搜索用时 187 毫秒
81.
Pesticide risk assessment and management in a globally changing world—report from a European interdisciplinary workshop 总被引:1,自引:1,他引:0
Marc Babut Gertie H. Arts Anna Barra Caracciolo Nadia Carluer Nicolas Domange Nikolai Friberg Véronique Gouy Merete Grung Laurent Lagadic Fabrice Martin-Laurent Nicolas Mazzella Stéphane Pesce Benoit Real Stefan Reichenberger Erwin W. M. Roex Kees Romijn Manfred Röttele Marianne Stenrød Julien Tournebize Françoise Vernier Eric Vindimian 《Environmental science and pollution research international》2013,20(11):8298-8312
82.
Mathilde Lefebvre Fabienne Dufernez Ange-Line Bruel Marie Gonzales Bernard Aral Judith Saint-Onge Nadège Gigot Julie Desir Caroline Daelemans Frédérique Jossic Sébastien Schmitt Raphaele Mangione Fanny Pelluard Catherine Vincent-Delorme Jean-Marc Labaune Nicole Bigi Dominique D'Olne Anne-Lise Delezoide Annick Toutain Sophie Blesson Valérie Cormier-Daire Julien Thevenon Salima El Chehadeh Alice Masurel-Paulet Nicole Joyé Claude Vibert-Guigue Luc Rigonnot Thierry Rousseau Pierre Vabres Philippe Hervé Antonin Lamazière Jean-Baptiste Rivière Laurence Faivre Nicole Laurent Christel Thauvin-Robinet 《黑龙江环境通报》2015,35(7):675-684
83.
The spatial configuration of metapopulations (numbers, sizes, and localization of patches) affects their ability to resist demographic extinction and genetic drift, but sometimes with opposite effects. Small and isolated patches, for instance, contribute marginally to demography but may play a large role in genetics by maintaining a sizeable amount of genetic variance among demes. In source-sink systems, similarly, connectivity may be beneficial in terms of effective size, but detrimental in terms of survival, by lowering the reproductive value of source populations. How to reconcile these opposite effects? Here we propose an analytical framework that integrates fixation time (ability to resist genetic drift) and extinction time (ability to resist demographic extinction) into a single index of resistance, measuring the ability of a metapopulation to maintain its demo-genetic integrity. We then illustrate with numerical examples how conflicting demands may be resolved. 相似文献
84.
Laurent Dupont Jamila Bouanda Jacques Dumonceau Michel Aplincourt 《Environmental Chemistry Letters》2005,2(4):165-168
We studied the removal of copper and zinc ions from aqueous solutions using a lignocellulosic substrate obtained by an acido-basic treatment of wheat bran. The sorption capacity of this material was investigated through batch and column experiments. Batch experimental results showed that the retention capacity of the lignocellulosic substrate was 0.20×10–3 mol g–1 at pH 4.5 for copper(II) and 0.24×10–3 mol g–1 at pH 6.5 for zinc(II). Column experiments showed a reduced sorption capacity for both ions compared to batch experiments. Batch and column data were analysed using the Langmuir equation in order to determine the affinity constant and the binding capacity of the sorbent and to compare both retention processes. 相似文献
85.
86.
A Multi-Channel Continuous Water Toxicity Monitoring System: Its Evaluation and Application to Water Discharged from a Power Plant 总被引:2,自引:0,他引:2
A multi-channel continuous water toxicity monitoring system was, after confirming the systems' performance, implemented to
samples of water discharged from power plants to detect and classify their toxicity using several recombinant bioluminescent
bacteria. Each channel of the system is composed of a series of two mini-bioreactors to enable a continuous operation, i.e.,
without system interruption due to highly toxic samples. A different recombinant bacterial strain was present in each channel:
DPD2540 (fabA::lux CDABE), DPD2794 (recA::luxCDABE), and TV1061 (grpE::luxCDABE), which are induced by cell membrane-, DNA-, and protein-damaging agents, respectively. GC2 (lac::luxCDABE) is a constitutive strain, whose bioluminescence is reduced by an increase in cellular toxicity. Phenol and mitomycin C (MMC)
were used for evaluating the system's performance to detect toxic chemicals. These samples were injected into the second mini-bioreactor
according to a step or bell-curve manner. The field samples used in this study were obtained from the water discharged from
two different power plants in Korea – from a nuclear power plant and a thermo-electronic power plant, and were injected into
the second mini-bioreactor to initiate the toxicity test. Each channel showed specific bioluminescent (BL) response profiles
due to the toxic compounds present in the water samples. Comparing the BL signals between the standard toxic chemical samples
and discharged water samples, the equivalent toxicity of the field water could be estimated. Finally, it was proved that this
novel continuous toxicity monitoring system can be used as an alternative tool for the quick monitoring and control of water
quality, as well as aid in the setting up of a new monitoring strategy to protect the source of tap water and in the prevention
of polluted water discharge. 相似文献
87.
Laurent M. Lapierre Yanhong Li Ho Kwong Kwan Jeffrey H. Greenhaus Marco S. DiRenzo Ping Shao 《组织行为杂志》2018,39(4):385-401
This study meta‐analytically examined theoretically derived antecedents of both directions of work–family enrichment (sometimes labeled facilitation or positive spillover), namely, work–family enrichment and family–work enrichment. Contextual and personal characteristics specific to each domain were examined. Resource‐providing (e.g., social support and work autonomy) and resource‐depleting (e.g., role overload) contextual characteristics were considered. Domain‐specific personal characteristics included the individuals' psychological involvement in each domain, the centrality of each domain, and work engagement. Results based on 767 correlations from 171 independent studies published between 1990 and 2016 indicate that several contextual and personal characteristics have significant relationships with enrichment. Although those associated with work tend to have stronger relationships with work–family enrichment and those associated with family tend to have stronger relationships with family–work enrichment, several antecedent variables have significant relationships with both directions of enrichment. Resource‐providing contextual characteristics tend to have stronger relationships with enrichment than do resource‐depleting characteristics. There was very little evidence of gender being a moderator of relationships between contextual characteristics and enrichment. Lastly, meta‐analytic structural equation modeling provided evidence that a theoretical path model wherein work engagement mediates between several contextual characteristics and enrichment is largely generalizable across populations. 相似文献
88.
Gauquelin Thierry Michon Geneviève Joffre Richard Duponnois Robin Génin Didier Fady Bruno Bou Dagher-Kharrat Magda Derridj Arezki Slimani Said Badri Wadi Alifriqui Mohamed Auclair Laurent Simenel Romain Aderghal Mohamed Baudoin Ezekiel Galiana Antoine Prin Yves Sanguin Hervé Fernandez Catherine Baldy Virginie 《Regional Environmental Change》2018,18(3):623-636
Regional Environmental Change - Mediterranean forests are found in the Mediterranean basin, California, the South African Cape Province, South and southwestern Australia and parts of Central Chile.... 相似文献
89.
Vila M Lorber-Pascal S Laurent F 《Environmental pollution (Barking, Essex : 1987)》2007,148(1):148-154
Phytoremediation is of great interest to remediate soil contaminated with hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) and 2,4,6-trinitrotoluene (TNT). The ability of 4 agronomic plants (maize, soybean, wheat and rice) to take up these explosives and their fate in plants were investigated. Plants were grown for 42 days on soil contaminated with [(14)C]RDX or [(14)C]TNT. Then, each part was analyzed for its radioactivity content and the percentage of bound and soluble residues was determined following extractions. Extracts were analyzed by radio-HPLC. More than 80% of uptaken RDX was translocated to aerial tissues, up to 64.5 mgg(-1) of RDX. By contrast, TNT was little translocated to leaves since less than 25% of uptaken TNT was accumulated in aerial parts. Concentrations of TNT residues were 20 times lower than for RDX uptake. TNT was highly metabolized to bound residues (more than 50% of radioactivity) whereas RDX was mainly found in its parent form in aerial parts. 相似文献
90.
Enhanced activity of actinides and some decay products has been reported for the leaves of cypress trees (Chamaecyparis nootkatensis) at the edge of the Malvési uranium-processing facility, southwestern France. The enhanced activity is due to the release of actinides via the smokestacks and from artificial ponds inside the facility. This study was conducted to characterize airborne particulate matter deposited on the leaf surfaces and to investigate whether or not radioactive particles may be identified. Air-dried leaf samples were examined by scanning electron microscopy, in combination with energy-dispersive X-ray spectrometry. The samples were scanned systematically in both secondary and backscattered electron modes. Particles ranging in size from <200 nm to ~40 μm were found on most portions of the adaxial leaf surface, but they are especially abundant at the boundary between facial and lateral leaves. The majority of the analyzed particles could be attributed to five principal classes: carbonates, silicates, sulfates, oxides/hydroxides, and halides. In addition, other types of particles were found, including Fe alloys; scheelite-group phases; phosphates; sulfides; and fly ash spheres. Similar particles were also observed on the surface of a wheat sample used for comparison. Of special interest are U-rich particles, which were observed on the cypress leaves only and which were identified as U oxides, except for one particle, which was a U-oxide-fluoride. These U-rich particles were released into the atmosphere by the nuclear facility prior to their deposition on the leaf surfaces. As most of the U-rich particles are <2.5 μm across, they are respirable. Once inhaled, particles containing alpha-emitting isotopes represent a potentially long-term source of ionizing radiation inside the lungs and thus, pose a threat to the health of people living nearby. 相似文献