Regionalized soil roughness indices     

S. Guillobez  M. Arnaud 《Soil & Tillage Research》1998,45(3-4):419-432

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Synthesis and insecticidal activities of novel solanidine derivatives     

Rmi Beaulieu  Eric Grand  Imane Stasik  Jacques Attoumbr  Quentin Chesnais  Virginie Gobert  Arnaud Ameline  Philippe Giordanengo  Jos Kovensky 《Pest management science》2019,75(3):793-800

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Implication of human drug transporters to toxicokinetics and toxicity of pesticides     

Nelly Guniche  Arnaud Bruyere  Marc Le Ve  Olivier Fardel 《Pest management science》2020,76(1):18-25

Human membrane drug transporters are recognized as major actors of pharmacokinetics. Pesticides also interact with human drug transporters, which may have consequences for pesticide toxicokinetics and toxicity. The present review summarizes key findings about this topic. In vitro assays have demonstrated that some pesticides, belonging to various chemical classes, modulate drug transporter activity, regulate transporter expression and/or are substrates, thus bringing the proof of concept for pesticide‐transporter relationships. The expected low human concentration of pesticides in response to environmental exposure constitutes a key‐parameter to be kept in mind for judging the in vivo relevance of such pesticide‐transporter interactions and their consequences for human health. Existing data about interactions of pesticides with drug transporters remain, however, rather sparse; more extensive and systematic characterization of pesticide‐transporter relationships, through the use of high throughput in vitro assays and/or in silico methods, is, therefore, required. In addition, consideration of transporter polymorphisms, pesticide mixture effects and physiological and pathological factors governing drug transporter expression may help to better define the in vivo relevance of pesticide‐transporter interactions in terms of toxicokinetics and toxicity for humans. © 2019 Society of Chemical Industry  相似文献   

Occurrence and genesis of secondary magnesium-bearing calcites in soils     

R.J. St. Arnaud  A.J. Herbillon 《Geoderma》1973,9(4):279-298

The presence of magnesium-bearing calcites is indicated in soil carbonate accumulation layers and concretions. A differential solubility method permitted estimation of the mol percent magnesium-carbonate content of calcites in the presence of dolomite. The relationship between diffraction spacings and mol percent MgCO₃, of selected samples is in good agreement with that depicted by other workers for biogenic magnesium-bearing calcites.Magnesium-containing calcites are concentrated in clay (< 2 μ) and fine silt (2–10 μ) sizes of Cca horizons. Their presence in the clay fraction of Ck horizons is an indication that carbonate mineralogy may change at profile depths often considered to be unaffected by pedogenic processes.The dissolution of existing carbonates within solum horizons, the translocation of ions in solution and the reprecipitation of calcite in Cca and underlying horizons are the main processes applicable to a variety of different natural situations. The Mg level of the secondary calcites is likely regulated by the partitioning effect during their precipitation. Periodic moisture movement to greater depths and lateral movement of soil solutions serve as a regulating factor in maintaining soluble Mg at levels favorable to the precipitation of low-magnesium calcites in upland chernozemic soils of central Saskatchewan; higher magnesium contents occur in calcites occurring in subsoils underlying solonetzic and depressional chernozemic soils of the same area. Formation of magnesium-bearing calcites within concretions in soils of the Rusizi basin in Africa were likely influenced by Mg-rich ground waters; associated dolomite may also have been of a secondary nature.  相似文献   

Quantification of Common Wheat Adulteration of Durum Wheat Pasta Using Real‐Time Quantitative Polymerase Chain Reaction (PCR)     

Rmi Alary  Arnaud Serin  Marie‐Pierre Duviau  Philippe Jourdrier  Marie‐Franoise Gautier 《Cereal Chemistry》2002,79(4):553-558

Common wheat adulteration of durum wheat pasta was quantified using real‐time duplex polymerase chain reaction (PCR). The total DNA content of pasta was determined by amplifying part of a wheat gene encoding a lipid transfer protein, and common wheat DNA was quantified by amplifying part of the puroindoline‐b gene. Under the conditions defined by this study, for pasta with a theoretical adulteration of 3%, the experimentally determined mean value was 2.6–3.4%, depending on drying temperature. Pure durum wheat pastas were distinguished from adulterated pastas without ambiguity. This study demonstrates the feasibility of using real‐time duplex PCR to quantify common wheat adulteration of pasta dried at high temperature, quantification that was impossible with the French official peroxidase‐marker method.  相似文献