Chemical reactivity of hemp fibres placed into a cimentitous matrix was studied by using a lime solution as a simplified cement solution. The hemp fibres contain 56.1 wt.% of cellulose, 20.1 wt.% of pectin, 10.9 wt.% of hemicellulose and 6 wt.% of lignin. These compounds are not solubilised in a basic medium rich in calcium but a part located at the fibre surface should be degraded. This treatment leads also to the decrease of the cristallinity index of the cellulose. Calcium ions adsorb in a large quantity onto the fibre surface due to the high concentration of pectin. The structure of the homogalacturonic part of pectin forms with Ca2+ a stable chelate called "egg-box", supporting cation adsorption. The fibres are then covered by Ca(OH)2 nodules after immersion in a lime solution
Fucosylation in plants occurs in glycoproteins and polysaccharides but the function of fucosylation is largely unknown. We aimed to analyze the effects of over-expression of human fucosyltransferase III (hFucT III) on in vivo N-glycan accumulation in tobacco plant leaves and focused on comparing the amount of Lewis a (Le a )-epitope accumulation in transgenic and in wild-type plants. Fucosyltransferase assays, Western blot and mass spectrometry were used to identify, quantify and analyse Le a N-glycans. We found that constitutive overexpression of hFucT III activity had no effect on Le a complex type N-glycans accumulation. Our results suggest that tobacco recombinant hFucT III acts more as a hydrolase than as a transferase.
L’arsenic (As) est un polluant métalloïde normalement présent dans l’environnement. Co-produit de l’extraction du minerai d’or, l’arsenic constitue le principal polluant des terrils miniers comme le terril de la mine de Chéni en Haute Vienne (87). Au cours de ce travail, nous avons démontré qu’il est possible de re-végétaliser un terril riche en As (8 g.kg-1 de substrat) grâce à un apport de terre exempte de polluants. Ce traitement diminue à la fois la contamination des plantes, mais améliore également la rétention de l’eau dans le sol, diminuant ainsi l’expression des contraintes hydriques. La stabilisation des sols par les plantes est importante car elle permettra de réduire l'érosion du terril et, donc, la fuite de polluant vers les cours d’eau bordant cette friche industrielle.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.