Anaerobic 4-hydroxyproline utilization: Discovery of a new glycyl radical enzyme in the human gut microbiome uncovers a widespread microbial metabolic activity.

The discovery of enzymes responsible for previously unappreciated microbial metabolic pathways furthers our understanding of host-microbe and microbe-microbe interactions. We recently identified and characterized a new gut microbial glycyl radical enzyme (GRE) responsible for anaerobic metabolism of trans-4-hydroxy-l-proline (Hyp). Hyp dehydratase (HypD) catalyzes the removal of water from Hyp to generate Δ1-pyrroline-5-carboxylate (P5C). This enzyme is encoded in the genomes of a diverse set of gut anaerobes and is prevalent and abundant in healthy human stool metagenomes. Here, we discuss the roles HypD may play in different microbial metabolic pathways as well as the potential implications of this activity for colonization resistance and pathogenesis within the human gut. Finally, we present evidence of anaerobic Hyp metabolism in sediments through enrichment culturing of Hyp-degrading bacteria, highlighting the wide distribution of this pathway in anoxic environments beyond the human gut

Motivation and constraints of illocution in the lexical constructional model: the case of the Aux NP construction

This article addresses the motivation and constraints of illocutionary meaning production. Within the framework of the Lexical Constructional Model (LCM), I explore how our knowledge of illocution is understood in terms of high-level situational models which are activated to produce speech act meaning and the way such operations motivate the conventionalized value of linguistic expressions. In so doing, I analyze the realization procedures of the Aux NP construction in relation to their potential to exploit the semantic base of requestive acts. I will study the most conventional linguistic realizations of the construction and explore the way in which such realizations are used to produce a requestive meaning. The resulting account provides a comprehensive understanding of the constructional nature of illocutionary meaning on the basis of naturally occurring data

Análisis de la influencia de la auto-confianza en las intenciones emprendedoras

El presente estudio tiene como objetivo investigar el efecto moderador del género en la relación entre auto-confianza y el desarrollo de intenciones emprendedoras de un grupo de personas en Barranquilla - Colombia. La auto-confianza emprendedora (ESE, pos sus siglas en inglés) es considerada como el conjunto de capacidades que pueden modificar la confianza de una persona para desarrollar las tareas requeridas para iniciar y establecer de manera exitosa un nuevo negocio [1]. De acuerdo con lo esperado, la relación entre intenciones emprendedoras y auto-confianza no está moderada por el género. El autor propone implicaciones prácticas y directrices para investigaciones posteriores.Abstract: This study is aimed to investigate the moderating role of gender in the relationship between self-efficacy and the development of individual intentions to become entrepreneurs in a group of people in Barranquilla-Colombia. Entrepreneurial self-efficacy (ESE) is viewed as having the capabilities that can modify a person’s belief in his or her likelihood of completing the tasks required to successfully initiate and establish a new business [1]. According to expectations, the relationship between entrepreneurial intentions and self-efficacy was not moderated by gender. The author discusses practical implications and directions for future research

Destination website quality, users’ attitudes and the willingness to participate in online co-creation experiences

Purpose – An official destination website (ODW) is a key component for tourist’s decision-making processes. ODW acts as a direct channel where users may share experiences and opinions about previous or future travels. At the same time, it drives user participation in destination branding activities. In this context, it is crucial to identify how the destination website, using Web 2.0 technologies, could motivate user’s participation with the brand. The purpose of this paper is to propose and evaluate a model that posits the destination website quality as a determinant factor to predict users’ attitudes toward the website and their willingness to participate in co-creation experiences. Design/methodology/approach – Using a combined qualitative and quantitative method, this paper provides an exploratory research that examines the role of destination website quality on attitudes toward the website and the willingness to participate in online co-creation experiences. Findings – Findings confirm that there is a direct and significant relationship between website quality, attitudes toward the website and willingness to participate in online co-creation experiences. Moreover, attitudes toward the website partially mediate relationships between destination website quality and willingness to participate in online co-creation experiences. Originality/value – The literature of value co-creation is trying to identify which factors drive consumer’s participation with brands across different consumption contexts. This study provides evidence that confirms, from a tourism destination website point of view, that website quality is one of these key factors that motives user’s co-creation with a destination.This research was funded by a grant from the Spanish Ministry of Economy, Industry and Competitiveness, with the National Plan for Research, Development and Innovation ECO2014-59356-P, and also with the research project ECO2015-69103-

A proposal for an air quality monitoring system for Cartagena de Indias

This paper presents an Air Quality Monitoring System for the city of Cartagena de Indias. The goal of this system is to monitor the air quality in the city and to establish the current state of the air Cartagena's citizen breathe. Data is going to be acquired through a sensor network, and the information is going to be displayed on web or mobile application allowing access from anywhere in the world to anyone that may be interested. It is expected that the availability of this information allows research centers, educational institutions, and government to design plans for prevention and improvement of the air quality in the city based on historical and real-time data. © 2019 Latin American and Caribbean Consortium of Engineering Institutions. All rights reserved

Design, Characterization, and Environmental Applications of Hydrogels with Metal Ion Coordination Properties

In this chapter, we discuss the design and synthesis of hydrogels and related polymeric materials with metal ion coordination properties, with the aim to review the main synthetic strategies used in the area. Then, we focus on the solid-state nuclear magnetic resonance (ss-NMR) spectroscopic technique due to its importance as a structural elucidation tool in both powdered and hydrated state, with emphasis on cross-polarization magic angle spinning (CP-MAS) and high-resolution magic angle spinning (HRMAS). Also, we explain different adsorption models, with the aim to present the methods most commonly used to analyze the uptake properties of hydrogel materials toward metal ions or organic compounds. Finally, we will discuss the applications of these materials for the removal of heavy metal ions and organic compounds, in terms of efficiency in the uptake of these ions and the different techniques commonly used to study the coordination process and the generation of reactive oxygen species (ROS) from hydrogen peroxide (H2O2). The main aim is to provide scientists with a review of the spectroscopic techniques most commonly used for bulk and surface characterization of non-soluble materials

La jácara en el siglo XVII : literatura y música entre las fuentes escritas y la tradición oral

[ES]El trabajo examina el origen y la etimología del concepto de “jácara”. Tras reseñar los distintos significados, estudia la estructura de su esquema musical durante los siglos XVII y XVIII. Para ello analiza las fuentes musicales y literarias de la época.[EN]The paper reviews the origin and etymology of the concept of "jácara". After outlining the different meanings, it studies the structure of its musical pattern during the seventeenth and eighteenth centuries. In order to achieve it, the work analyzes the musical and literary sources of that times