Marie-France Dignac

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Understanding the origin of the carbon (C) stabilised in soils is crucial in order to device management practices that will foster Caccumulation in soils. The relative contributions to soilC pools of roots vs. shoots is one aspect that has been mostly overlooked, although it appears a key factor that drives the fate of plant tissueC either as mineralized(More)
Lignin is an aromatic plant compound that decomposes more slowly than other organic matter compounds; however, it was recently shown that lignin could decompose as fast as litter bulk carbon in minerals soils. In alpine Histosols, where organic matter dynamics is largely unaffected by mineral constituents, lignin may be an important part of soil organic(More)
For the last decades, the fate of lignins in soil was analyzed mainly with cupric oxide (CuO) oxidation, which is traditionally used to quantify soil lignin content and characterize its state of degradation. This method presents limitations due to incomplete depolymerization of the lignin structure. In this study, we used a physicochemical soil lignin(More)
The international 4 per 1000 initiative aims at supporting states and non-governmental stakeholders in their efforts towards a better management of soil carbon (C) stocks. These stocks depend on soil C inputs and outputs. They are the result of fine spatial scale interconnected mechanisms, which stabilise/destabilise organic matter-borne C. Since 2016, the(More)
Combining lipid biomarker profiling with stable isotope probing (SIP) is a powerful technique for studying specific microbial populations responsible for the degradation of organic pollutants in various natural environments. However, the presence of other easily degradable substrates may induce significant physiological changes by altering both the rate of(More)
Some commercially available chronometric assays are influenced by the residual antithrombin activity of low molecular weight heparins (LMWH) and they underestimate the ex vivo anti Xa activity. We have evaluated a new kit (Staclot-Heparin) highly specific for the anti Xa activity of LMWH. A comparison with the results given by a reference chromogenic method(More)
RATIONALE The objective of this investigation was to test gas-chromatographic compound-specific analysis for studies on the isotopic composition of (13)C-enriched sugar molecules. The effects of (13)C enrichment and type of sugar (C5, C6) will provide valuable information on isotopic correction for future studies employing (13)C-enriched sugars. METHODS(More)
RATIONALE The efficiency of extraction procedures for the determination of organic compounds in soil may be affected by the presence of the mineral phase. Our aim was to analyse the magnitude of such an effect on both total polysaccharide content and (13)C-isotopic signature of the polysaccharides. METHODS After acid hydrolysis of (13)C-labelled wheat,(More)
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