Browsing by Subject "Interference"

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    L’analyse des erreurs en production écrite chez les apprenants arabophones en classe de FLE.
    (2018) Afifi, Dalia
    In the teaching of foreign languages, the status of the error has evolved because it is no longer considered as a negative sign that refers to a lack of knowledge. Nevertheless, language in- terference remains a major source of difficulties for Arabs learning French as a foreign langua- ge. This study focuses on the analysis of essays written by Palestinian learners of A1-A2 level at Birzeit University. It aims to analyze the ty- pes of errors committed as well as their sources.
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    The use of cyclodextrins as solubility enhancers in the ORAC method may cause interference in the measurement of antioxidant activity
    (Elsevier, 2022-02-26) Navarro Orcajada, Silvia; Rodríguez Bonilla, Pilar; Matencio Durán, Adrián; Conesa Valverde, Irene; López Nicolás, José Manuel; García Carmona, Francisco; Bioquímica y Biología Molecular A
    The ability of cyclodextrins to enhance the water solubility of lipophilic compounds is used to modify the waterbased Oxygen Radical Absorbance Capacity (ORAC) method to measure antioxidant activity in vitro. However, the use of these solubility enhancers may alter fluorescent readings, which has led to contradictory results being described in the literature. The low specificity of these oligosaccharides and their controlled release effect can result in cyclodextrins forming inclusion complexes with other reagents in the assay, changing the kinetics. In this study, the cause of cyclodextrins’ interference in the ORAC method is evaluated through a physicochemical and computational approach. Cyclodextrins showed a clear increase in the fluorescent signal both in the presence and absence of the antioxidant oxyresveratrol, the precise effect being dependent on the type and concentration of cyclodextrin. Although the glucidic nature of cyclodextrins could play a minimal role in this effect, it seems that the main cause was the encapsulation of other substrates in the reaction, fluorescein and AAPH.