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C19H17BrN2O2S2, triclinic, P1‾ $P\overline{1}$ (no. 2), a = 7.8069(5) Å, b = 8.0787(5) Å, c = 15.7738(9) Å, α = 97.540(2)°, β = 90.179(2)°, γ = 104.507(2)°, V = 954.13(10) Å3, Z = 2, R gt(F) = 0.0423, wR ref(F 2) = 0.1134, T = 296.15 K.

An understanding of solid-liquid interfaces is of great importance for fundamental research as well as industrial applications. However, it has been very challenging to directly image solid-liquid interfaces with high resolution, thus their structure and properties are often unknown. Here, we report a quasi-liquid phase between metal (In, Sn) nanoparticle surfaces and an aqueous solution observed using liquid cell transmission electron microscopy. Our real-time high-resolution imaging reveals a thin layer of liquid-like materials at the interfaces with the frequent appearance of small In nanoclusters. Such a quasi-liquid phase serves as an intermediate for the mass transport from the metal nanoparticle to the liquid. Density functional theory-molecular dynamics simulations demonstrate that the positive charges of In ions greatly contribute to the stabilization of the quasi-liquid phase on the metal surface.

In this study, the contents of total phenols and total anthocyanins in blue honeysuckle fruit from six regions (Jiagedaqi, Xinlin, Hongwei, Amur, Tuqiang and Tahe) of the Greater Khingan Mountains were determined and compared, the antioxidant capacity of phenols from blue honeysuckle fruit was comprehensively analyzed using three different methods, and the hypoglycemic activity was evaluated by measuring its half maximal inhibitory concentration (IC50) against α-amylase and α-glucosidase. The crude extract rich in polyphenols were separated and purified, and the resulting fractions were analyzed qualitatively and quantitatively. The results showed that the contents of total phenols and total anthocyanins in blue honeysuckle fruit from these six regions differed significantly, but the compositions were basically the same and all phenolic extracts had high antioxidant capacity. They had inhibitory activity against α-amylase and α-glucosidase, indicating the potential of blue honeysuckle fruit from these six regions for development and utilization.

Objective: A simultaneous determination method was established for detecting 19 kinds of quinolones and sulfonamides in aquatic products simultaneously, by using QuEChERS combined with UPLC-MS/MS. Methods: Samples were extracted with 1.0% formic acid acetonitrile solution, ultrasonic for 1 min, and purified by QuEChERS multi-function needle filter. The sample purification and filtering were performed simultaneously. The Mass spectrometry was conducted by using positive (ESI+) electrospray ionization and multi-reactions monitoring (MRM) models, with external standard method. Results: The detection limit of 19 kinds of sulfonamides and quinolones is from 0.5 to 1.0 μg/kg. Compared with the national standard method, the detection sensitivity is improved. The added recoveries were from 81.0% to 113.0%, and the relative standard deviation (RSD) were from 0.2% to 11.7%. Conclusion: This method assisted ultrasonic extraction and QuEChERS, enhanced the efficiency of measuring quinolones and sulfonamides in aquatic products. It is a simple, rapid, sensitivity, accurate method, which provides an efficient technical means for daily monitoring of sulfonamides and quinolones in large quantities of aquatic product samples.

As the only alkaline polysaccharide in nature, chitosan(CTS) is haracterized by its unique physiological activity, good film-forming capacity, well adsorption and antibacterial properties. Various pharmaceutical preparations and clinical applications of CTS and its derivatives have proved the practicability of CTS products in the field of pharmaceutical preparations. CTS and its derivatives have a good development prospect in the field of medicine and clinical application.

La présente étude empirique vise à examiner l’influence de l’aspect lexical sur l’acquisition initiale du passé composé et de l’imparfait chez les apprenants sinophones en français langue étrangère, tout en essayant de dégager des difficultés d’apprentissage sous-jacentes. Selon l’hypothèse de l’aspect, aux stades initiaux de l’acquisition, les apprenants associent de manière préférentielle la morphologie perfective aux prédicats téliques (à savoir les verbes d’accomplissement et d’achèvement) et la morphologie imperfective aux prédicats atéliques (à savoir les verbes d’état et d’activité). Les analyses statistiques effectuées ont mis en évidence cette préférence significative chez les apprenants sinophones testés, dont la L1 est connue pour l’absence de la morphologie temporelle, corroborant les résultats obtenus dans des études menées auprès d’apprenants qui marquent la morphologie temporelle dans leur L1. Il en ressort que l’acquisition de la morphologie verbale pourrait être étroitement liée à l’aspect lexical, indépendamment de la présence ou de l’absence de la morphologie temporelle en L1. Les résultats montrent également que les apprenants testés ont eu plus de difficultés à reconnaître l’emploi atypique des temps verbaux par rapport à leur emploi typique, notamment pour les verbes d’état et d’achèvement, et ce, probablement à cause de l’influence du système aspectuel du chinois, lequel présente de notables différences par rapport à celui du français.