No abstract

Liquid metal (LM) catalysts have been demonstrated to accelerate chemical reactions, providing an intriguing route to fine chemical synthesis with immense technological implications. Herein, we explore gallium-based LMs as catalysts to promote the oxidative self-polymerization of natural polyphenols, an emerging class of natural building blocks for surface functionalization with diverse biochemical properties. The oxidative polymerization of polyphenols, triggered by eutectic alloy of gallium and indium, results in nanocoatings with remarkably high reaction kinetics. The oxidative polymerization occurs in a wide pH range including an acidic environmenta condition previously unexplored for the deposition of phenolic coatings. The LM triggers the generation of highly active radical species from the oxidant causing the rapid oxidation of the polyphenols and their subsequent deposition on a range of different substrates. We further show that the LM-based catalytic system addresses several other limitations of existing coating methods including a narrow pH range, substrate specificity (precursor–dependent), and low coating uniformity. Finally, we demonstrate that the phenolic nanocoatings obtained from the acidic pH environment have excellent antioxidant and antibacterial properties without requiring any post-functionalization step. This process for creating phenolic nanocoatings may find applications in a wide range of industries, food science, and biomedicine.

Resumen El propósito de este trabajo es profundizar en el concepto de actividad de imagen y defender su utilidad como categoría de estudio para comprender diferentes tipos de comportamiento que afectan a la imagen social de los hablantes en la interacción comunicativa: cortesía, descortesía y actividad de autoimagen. Teniendo como base estudios sociopragmáticos del español desde una perspectiva cultural y estudios teóricos en inglés de la última década, se tratará el concepto de actividad de imagen, el cual se caracteriza de acuerdo con dos conceptos claves: el del efecto social que un comportamiento comunicativo tiene sobre las imágenes de los hablantes y el del continuo social, la conexión que se establece entre sus imágenes en la interacción. De esta forma, se propone tratar la actividad de imagen desde dos perspectivas relacionadas: la de la dirección seguida por el efecto social hacia los interactuantes (la direccionalidad) y la de las características de este efecto (la modalidad), siendo su interrelación el factor que permite identificar y caracterizar el tipo de actividad de imagen.

No abstract

As part of the quality improvement program “Health Alliance for Prudent Prescribing, Yield And Use of anti-microbial Drugs In the Treatment of respiratory tract infections” (HAPPY AUDIT) South America, we planned to implement an intervention based on the use of quality indicators as a means to influence General Practitioners’ (GPs) prescribing decision. Knowledge on the acceptability and applicability of an intervention is crucial to decide whether the intervention is suitable and will achieve the expected outcomes. This study explores GPs’ views about the acceptability and applicability of using quality indicators as an intervention to influence their prescribing decision in patients with suspected Respiratory Tract Infections (RTIs) across four countries in South-America. In March 2015, GPs that were participating in HAPPY AUDIT South America were invited to participate in focus groups. A discussion guide covering the domains acceptability and applicability was used. Data was analyzed through systematic text condensation with an inductive approach. 171 GPs were invited and 48% participated. Acceptability ranged from totally acceptable to slightly acceptable. This spectrum of GPs views on acceptability was influenced by themes concerning applicability. In conclusion, there is a positive attitude towards the use of quality indicators. Nonetheless, applicability challenges have to be taken into consideration and solved if we are to achieve a large effect with the implementation of this intervention.