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141.
This study shows the important role of humic acids in the degradation of 14C and 13C labeled isomer of NP by Sphingomonas sp. strain TTNP3 and the detoxification of the resulting metabolites. Due to the association of NP with humic acids, its solubility in the medium was enhanced and the extent of mineralization of nonylphenol increased from 20% to above 35%. This was accompanied by the formation of significant amounts of NP residues bound to the humic acids, which also occurred via abiotic reactions of the major NP metabolite hydroquinone with the humic acids. Gel permeation chromatography showed a non-homogenous distribution of NP residues with humic acids molecules, with preference towards molecules with high-molecular-weight. Solid state 13C nuclear magnetic resonance spectroscopy indicated that the nonextractable residues resulted exclusively from the metabolites. The chemical shifts of the labeled carbon indicated the possible covalent binding of hydroquinone to the humic acids via ester and possibly ether bonds, and the incorporation of degradation products of hydroquinone into the humic acids. This study provided evidences for the mediatory role of humic acids in the fate of NP as a sink for bacterial degradation intermediates of this compound. 相似文献
142.
Study of trace metal leaching from coals into seawater 总被引:1,自引:0,他引:1
The behaviour of three South African coals in water and, particularly in seawater, was examined. A sequential speciation procedure used to evaluate trace metal partitioning in coal has shown that trace metals will not be easily released from these coals into environmental ecosystems. Only a few trace elements are slightly leached from these coals into water or seawater at pH around 8. On the other hand, Mn is highly leached from these coals into water or seawater. It has been clearly shown that Mn concentrations are highly correlated to sulfate and calcium concentrations indicating that Mn is mainly solubilized into water simultaneously to gypsum; the leaching efficiency being severely reduced for coal having a high calcite content. The leaching percentage of Mn into seawater is enhanced by the presence of seawater salts that increases gypsum solubility. The leaching process of Mn from coal into water or seawater is governed by gypsum solubilization and is relatively rapid during the first thirty minutes, then very slow. In this study, it has been also shown that, depending on their physico-chemical properties, trace metals may be removed from seawater solutions in the presence of coal having a high calcite content. In this work, it has been also shown that some elements, particularly Fe, are greatly solubilized into seawater in the presence of a strong chelating agent like EDTA. Like for Mn, the leaching rate of metals from coal in the presence of EDTA is relatively rapid during the first 30 min then much slower, suggesting a solubilization process simultaneously to gypsum or/and calcite solubilization. 相似文献
143.
François Vialard Giuseppe Simoni Denise Molina Gomes Azzedine Abourra Simona De Toffol Fabrice Bru Maria Carmen Martinez Romero Lucio Nitsch Philippe Bouhanna Livia Marcato Thomas Popowski Beatrice Grimi Jose Antonio Martínez-Conejero B. Benzacken Rita Genesio Francesca R. Grati 《黑龙江环境通报》2012,32(4):329-335
144.
Le Billon P 《Disasters》2005,29(1):1-25
This paper examines advocacy initiatives by humanitarian and human rights organisations to address problems of governance in resource-rich and conflict-affected countries, focussing on the case of Angola. Humanitarian principles preclude the use of indiscriminate conditionality and point towards a cautious approach to advocacy aimed at assisting vulnerable populations. Furthermore, the relatively insignificant amount of aid supplied to resource-rich local authorities means that individual agencies have precious little leverage, especially when commercial interests rather than humanitarian or 'good governance' principles influence the priorities of bilateral donors. A context of resource wealth calls for: high levels of coordination and cooperation between human rights groups, aid agencies and donors; balanced use of conditionality, based on the drawing, by donors, of a clear distinction between emergency and development-oriented assistance; and a sustained effort to highlight the responsibilities of local authorities, foreign governments and businesses in meeting humanitarian and development objectives. 相似文献
145.
Ingrid Witters Philippe Moerman Maximilian Muenke Frans-André Van Assche Koen Devriendt Eric Legius Dominique Van Schoubroeck Jean-Pierre Fryns 《黑龙江环境通报》2001,21(10):839-841
We report the prenatal echographic diagnosis of holoprosencephaly (HPE) at 11 weeks' gestation. Fetopathological examination revealed an unusual variant of semilobar HPE with middle interhemispheric fusion associated with sex-reversal: 46,XY normal male karyotype, normal external and internal female genitalia and streak gonads. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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Estienney Marie Daval-Frerot Philippe Aho-Glélé Ludwig-Serge Piroth Lionel Stabile Pascal Gerbet Jean-Yves Rouleau Romain de Rougemont Alexis Belliot Gaël 《Food and environmental virology》2022,14(2):217-221
Food and Environmental Virology - Disinfection of hospital facilities and ambulances is an important issue for breaking the chain of transmission of viral pathogens. Hydrogen peroxide has provided... 相似文献