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321.
Michel Trousseau Julio Hermida 《生态毒理学报》2001,(2):38-42
布宜诺斯艾利斯市的增长伴随着环境的逐渐恶化,其中包括水流的质量.随着情况的全面恶化,1993年政府将饮用水厂进行了为期30年的私有化,并在布宜诺斯艾利斯市及其17个郊区社区进行净化处理.阿瓜斯阿根廷斯(AguasAgentinas)的用水操作者是里昂水业集团,为了响应当局的要求,提出并着手进行净化处理的新指导模式,这有助于解决该承包区目前的环境问题. 相似文献
322.
Nogaro G Mermillod-Blondin F Montuelle B Boisson JC Lafont M Volat B Gibert J 《Chemosphere》2007,70(2):315-328
The purpose of this study was to quantify the influences of tubificid worms on the biogeochemical functioning of an infiltration system impacted by a stormwater sediment deposit. Effects of worms with stormwater sediment deposit were compared with effects of worms with two other natural sediment deposits (one low and one rich-particulate organic matter deposits). We measured the effects of invertebrates on sediment reworking, organic matter processing, solute fluxes, microbial characteristics, and pollutant release from stormwater deposit to water. Our results showed that tubificid worms had slight effects on microbial activities in presence of the stormwater deposit whereas they significantly stimulated microbial activities in columns impacted by the other two deposits. High contents of labile organic matter contained in stormwater sediments probably led to very strong microbial activities that could not be easily stimulated by worm activities. In our experimental conditions, no significant influence of tubificid worms on the fate of pollutants (heavy metals and PAHs) contained in the stormwater deposit was measured. In conclusion, our study demonstrated that the organic matter characteristics of the stormwater sediments limited the efficiency of tubificid worms to stimulate organic matter mineralization in infiltration systems. 相似文献
323.
Lemmens B Elslander H Vanderreydt I Peys K Diels L Oosterlinck M Joos M 《Waste management (New York, N.Y.)》2007,27(11):1562-1569
Plasma gasification is an innovative technology for transforming high calorific waste streams into a valuable synthesis gas and a vitrified slag by means of a thermal plasma. A test program has been set up to evaluate the feasibility of plasma gasification and the impact of this process on the environment. RDF (refuse derived fuel) from carpet and textile waste was selected as feed material for semi-pilot gasification tests. The aim of the tests was: (1) to evaluate the technical feasibility of making a stable synthesis gas; (2) to characterize the composition of this synthesis gas; (3) to define a suitable after-treatment configuration for purification of the syngas and (4) to characterize the stability of the slag, i.e., its resistance to leaching for use as a secondary building material. The tests illustrate that plasma gasification can result in a suitable syngas quality and a slag, characterized by an acceptable leachability. Based on the test results, a further scale-up of this technology will be prepared and validation tests run. 相似文献
324.
Jules Sadefo Kamdem Ange Nsouadi Michel Terraza 《Environmental Modeling and Assessment》2016,21(2):279-289
In this paper, interactions or co-movement between the CER and EUA futures prices are examined in order to shed light on the dependency between the European Union Emissions Trading Scheme (EU ETS) and the clean development mechanism (MDP). Our analysis uses the wavelet method to model the correlation between CER and EUA in the time-frequency domain. It highlights the impact of different investors (according to their investment horizons) on the co-movement between the CER and EUA prices, and therefore, the behavior of individual investors as speculators, arbitrageurs, and hedgers on European allowance and CDM credits cumulatively. In this vein, we analyze according to the frequency intervals, price convergence, identification of potential factors that could explain a difference in futures prices, and structural changes in the EUA and CER prices. The application is made using daily EUA’s and CER’s prices data. 相似文献
325.
Julie Langeron Stéphanie Sayen Michel Couderchet Emmanuel Guillon 《Environmental science and pollution research international》2014,21(7):4906-4913
The transfer of eleven phenylurea herbicides through soil columns was investigated in laboratory conditions in order to determine leaching properties in a calcareous soil. Elution curves with distilled water were plotted after herbicide application on the soil column. Phenylurea retention by the soil indicating interactions with soil can be classified as follows: fenuron < fluometron ≤ isoproturon = monuron < metoxuron < monolinuron < metobromuron < chlorotoluron < linuron = diuron < chlorbromuron. The number and nature of halogen atoms on the phenyl ring had an important influence on leaching. Retention was higher for molecules with higher number of halogen, and it was also higher for bromine than chlorine. Column elution experiments were compared to batch experiments from which the distribution coefficients K d were determined. According to Kendall correlation coefficients, parameter m/m 0max from column experiments was relatively well linked to K d. In case of phenylurea, a linear relationship between K d and m/m 0max was established. 相似文献
326.
327.
Dallel Arabet Sébastien Tempel Michel Fons Yann Denis Cécile Jourlin-Castelli Joshua Armitano David Redelberger Chantal Iobbi-Nivol Abderrahmane Boulahrouf Vincent Méjean 《Environmental science and pollution research international》2014,21(8):5619-5627
Sulfonylurea herbicides are widely used on a wide range of crops to control weeds. Chevalier® OnePass herbicide is a sulfonylurea herbicide intensively used on cereal crops in Algeria. No information is yet available about the biodegradation of this herbicide or about its effect on the bacterial community of the soil. In this study, we collected an untreated soil sample, and another sample was collected 1 month after treatment with the herbicide. Using a high-resolution melting DNA technique, we have shown that treatment with Chevalier® OnePass herbicide only slightly changed the composition of the whole bacterial community. Two hundred fifty-nine macroscopically different clones were isolated from the untreated and treated soil under both aerobic and microaerobic conditions. The strains were identified by sequencing a conserved fragment of the 16S rRNA gene. The phylogenetic trees constructed using the sequencing results confirmed that the bacterial populations were similar in the two soil samples. Species belonging to the Lysinibacillus, Bacillus, Pseudomonas, and Paenibacillus genera were the most abundant species found. Surprisingly, we found that among ten strains isolated from the treated soil, only six were resistant to the herbicide. Furthermore, bacterial overlay experiments showed that only one resistant strain (related to Stenotrophomonas maltophilia) allowed all the sensitive strains tested to grow in the presence of the herbicide. The other resistant strains allowed only certain sensitive strains to grow. On the basis of these results, we propose that there must be several biodegradation pathways for this sulfonylurea herbicide. 相似文献
328.
Leticia Burone Silvia Helena de Mello e Sousa Michel Michaelovitch de Mahiques Paulo Valente Aurea Ciotti Cíntia Yamashita 《Marine Biology》2011,158(1):159-179
Foraminiferal data were obtained from 66 samples of box cores on the southeastern Brazilian upper margin (between 23.8°–25.9°S
and 42.8°–46.13°W) to evaluate the benthic foraminiferal fauna distribution and its relation to some selected abiotic parameters.
We focused on areas with different primary production regimes on the southern Brazilian margin, which is generally considered
as an oligotrophic region. The total density (D), richness (R), mean diversity ([`(H¢ )] \overline{{H^{\prime } }} ), average living depth (ALD
X
) and percentages of specimens of different microhabitats (epifauna, shallow infauna, intermediate infauna and deep infauna)
were analyzed. The dominant species identified were Uvigerina spp., Globocassidulina subglobosa, Bulimina marginata, Adercotryma wrighti, Islandiella norcrossi, Rhizammina spp. and Brizalina sp.. We also established a set of mathematical functions for analyzing the vertical foraminiferal distribution patterns, providing
a quantitative tool that allows correlating the microfaunal density distributions with abiotic factors. In general, the cores
that fit with pure exponential decaying functions were related to the oligotrophic conditions prevalent on the Brazilian margin
and to the flow of the Brazilian Current (BC). Different foraminiferal responses were identified in cores located in higher
productivity zones, such as the northern and the southern region of the study area, where high percentages of infauna were
encountered in these cores, and the functions used to fit these profiles differ appreciably from a pure exponential function,
as a response of the significant living fauna in deeper layers of the sediment. One of the main factors supporting the different
foraminiferal assemblage responses may be related to the differences in primary productivity of the water column and, consequently,
in the estimated carbon flux to the sea floor. Nevertheless, also bottom water velocities, substrate type and water depth
need to be considered. 相似文献
329.
Jesse S. Michel Lindsey M. Kotrba Jacqueline K. Mitchelson Malissa A. Clark Boris B. Baltes 《组织行为杂志》2011,32(5):689-725
This study provides and meta‐analytically examines an organizing framework and theoretical model of work–family conflict. Results, based on 1080 correlations from 178 samples, indicate that work role stressors (job stressors, role conflict, role ambiguity, role overload, time demands), work role involvement (job involvement, work interest/centrality), work social support (organizational support, supervisor support, coworker support), work characteristics (task variety, job autonomy, family friendly organization), and personality (internal locus of control, negative affect/neuroticism) are antecedents of work‐to‐family conflict (WFC); while family role stressors (family stressors, role conflict, role ambiguity, role overload, time demands, parental demands, number of children/dependents), family social support (family support, spousal support), family characteristics (family climate), and personality (internal locus of control, negative affect/neuroticism) are antecedents of family‐to‐work conflict (FWC). In addition to hypothesized results, a revised model based on study findings indicates that work role stressors (job stressors, role conflict, role ambiguity, role overload) and work social support (organizational support, supervisor support, coworker support) are predictors of FWC; while family role stressors (family stressors, role conflict, role ambiguity, role overload), family involvement (family interest/centrality), family social support (family support, spousal support), and family characteristics (family climate) are predictors of WFC. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
330.