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Senda Zarrouk Alain Bermond Naïma Kolsi Benzina Valérie Sappin-Didier Laurence Denaix 《Environmental Chemistry Letters》2014,12(1):191-199
Food contamination by Cd and Pb is of increasing concern because contaminated composts and sewage sludges are used as soil fertilizers. Indeed, Cd and Pb from sewage sludge and compost can be transferred to plants and, in turn, to food. Predicting the quantity of metals transferred to plants is difficult and actual models are unable to give accurate concentrations. Therefore, new techniques are needed. For instance, diffusive gradient in thin-film (DGT) is commonly used to measure metal bioavailability in waters, sediments and soils, but DGT has not been well studied for metal uptake in plants. Moreover, actual models for soil–plant transfer are too complex and require many soil parameters. Here, we simplified the modelization of metal uptake by plants by considering only DGT fluxes and roots surfaces. We grew durum wheat in a greenhouse on sandy soils amended with urban compost or sewage sludge. Results show that Cd uptake was slightly underestimated when whole roots were considered as an absorbing surface. For Pb, the best estimation was found by using root tip surface. Overall, our model ranks correctly the samples but underestimates Pb uptake by 15 % and Cd uptake by 45 %. It is nonetheless a simpler way of modelling by using only DGT fluxes and root system morphology. 相似文献
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Cytomegalovirus (CMV) is the most common cause of congenital infection. Recent studies show amniocentesis to be a 100 per cent sensitive and 100 per cent specific predictor of congenital infection, and recommend that it be offered in the at-risk pregnancy. However, these publications have focused on pregnancies at or beyond 22 weeks' gestation. Here, we report a case of maternal CMV hepatitis at 7–8 weeks' gestation, in which culture and polymerase chain reaction testing for CMV in amniotic fluid at 20 weeks' gestation were negative, but the infant had a positive CMV urine culture shortly after delivery. Implications for the prenatal diagnosis of CMV infection are discussed. 相似文献
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Christel Thauvin-Robinet Thierry Rousseau Nicole Laurent Christine Durand Catherine Maingueneau Valérie Cormier-Daire Paul Sagot Laurence Faivre Annie Nivelon-Chevallier 《黑龙江环境通报》2002,22(8):710-714
We report here the fourth case of hypomandibular faciocranial dysostosis (HFD). The diagnosis was made at birth on the association of severe retrognathia, microstomia, severe hypoglossia with glossoptosis, persistent buccopharyngeal membrane, median cleft palate, bifid uvula, down-slanting palpebral fissures, short nose with anteverted nares, laryngeal hypoplasia, and low-set ears. A severe microstomia and micrognathia were detected by ultrasound at 31 weeks of gestation. Interestingly, even though the present case exhibits many facial dysmorphic features characteristic of HFD, craniosynostosis was absent. This report suggests that craniosynostosis is not mandatory for the diagnosis of this condition. Furthermore, we present a new argument for an autosomal recessive mode of inheritance for HFD. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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Marie Maud Bear Valérie Langlois Daniel Robic Richard Bourbouze Philippe Guerin 《Journal of Polymers and the Environment》1999,7(3):127-134
Design of optically active polymeric materials for temporary therapeutic and environmental applications requires the working-out of functionalized polymers with structures and properties adjusted to the considered applications. Biocompatibility of selected polymers is a required property in regard to the interactions between living organisms and macromolecular systems. It is therefore important to prepare highly optically active monomers and their corresponding hydrolyzable and biocompatible polymers. Bacterium Clostridium tetanomorphum is an useful source of enzymes for bioconversion and particularly in the chemoenzyrnatic route to optically active alkylmalolactonic acid esters and their optically pure stereoisomers. 3-Methylaspartase, involved in the glutamate fermentation pathway, is a very interesting enzyme, which can provide chiral precursors with high optically purity. This chemoenzymatic strategy can be used to prepare the four stereoisomers of 3-methylmalolaconic acid esters, by enzymatic resolution of natural and artificial stereoisomers of 3-methylaspartic acid. A series of 3-alkymalolactonic acid esters with alkyl equal to ethyl or isopropyl, have been also synthesized and transformed into corresponding optically active polyesters. 相似文献
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Sinsin Corine Bitossessi Laurenda Salako Kolawolé Valère Fandohan Adandé Belarmain Kouassi Konan Edouard Sinsin Brice Augustin Glèlè Kakaï Romain 《Environment, Development and Sustainability》2022,24(4):4901-4917
Environment, Development and Sustainability - Mangroves are one of the most threatened ecosystems globally. Likewise, they benefit many restoration efforts. However, these efforts have often... 相似文献