Search results for "ship"
showing 10 items of 6731 documents
Convergence properties of classes of decomposable measures
1988
Activity-Centered Design: An Appropriation Issue
2011
When designing workplace computer systems one must take human activity into account. It has become standard practice to approach this issue through user-centered design. The aim of this paper is to stimulate thought on activity-centered design and to propose the concept of appropriation as a fundamental principle of this design approach. This orientation aims to take into consideration the constituent function of tools during conception. We will take the design of computer systems dedicated to customer relations as an example.
From teacher training in Spain to educational practice in Senegal : an international cooperation project based on service learning for Pre-School and…
2021
Este artículo se encuentra disponible en la siguiente URL: https://revistas.uned.es/index.php/REEC/article/view/29393/23408 Este artículo pertenece al número "La educación en los países emergentes: ¿nuevos laboratorios educativos del siglo XXI?". Se presenta y analiza un proyecto de cooperación internacional para alumnado universitario español, en el que se combina la metodología formativa de aprendizaje servicio (ApS) con una estancia en un país emergente. Desde los grados de Educación Infantil y Educación Primaria de la Universidad CEU Cardenal Herrera, se planificó y ejecutó una intervención educativa en Djikesse (Senegal), concretamente en las escuelas de Educación Infantil (Guardería A…
La medición de la felicidad en el trabajo y sus antecedentes : un estudio empírico en el area de alergología de los hospitales públicos españoles
2014
La búsqueda de la felicidad en el trabajo es un objetivo de enorme importancia para muchas personas y organizaciones. Sin embargo, existe una carencia importante la investigación acerca de cómo aumentarla (Chivato Pérez et al., 2011), así como una amplia dispersión de medidas relacionadas (Hackman, 2009). No se conoce ninguna medida que recoja con la suficiente amplitud la medición de la felicidad en el trabajo (Fisher, 2010), por lo que en este estudio proponemos un modelo integrativo que nos aporte la medida de este nuevo constructo. Proponemos que la felicidad en el trabajo se compone de tres constructos ya consolidados en la literatura. La primera hipótesis de esta investigación es que …
El aprendizaje servicio como propuesta metodológica para una pedagogía crítica
2016
El presente artículo aborda la relación entre la pedagogía crítica y los pilaresfundamentales de la metodología del aprendizaje servicio. Su principal objetivo esdemostrar, de un modo concluyente, la idoneidad del aprendizaje servicio comometodología para alcanzar objetivos pedagógicos tales como la emancipación, latransformación y la justicia social. El trabajo parte de la clarificación de los pilaresfundamentales de la pedagogía crítica, entendida como paradigma filosófico-educativoque emerge de la Teoría Crítica de la Escuela de Frankfurt. Posteriormente, el artículoda cuenta de los fundamentos pedagógicos del aprendizaje servicio, aportandoargumentos que evidencian su capacidad para sat…
Toward sustainable environmental quality : Priority research questions for Europe
2018
P.J. Van den Brink et al.
Marine Pyrrole Alkaloids
2021
Nitrogen heterocycles are essential parts of the chemical machinery of life and often reveal intriguing structures. They are not only widespread in terrestrial habitats but can also frequently be found as natural products in the marine environment. This review highlights the important class of marine pyrrole alkaloids, well-known for their diverse biological activities. A broad overview of the marine pyrrole alkaloids with a focus on their isolation, biological activities, chemical synthesis, and derivatization covering the decade from 2010 to 2020 is provided. With relevant structural subclasses categorized, this review shall provide a clear and timely synopsis of this area.
Oxygenated Cembrene Diterpenes from Sarcophyton convolutum: Cytotoxic Sarcoconvolutum A–E
2021
The soft coral genus Sarcophyton contains the enzymatic machinery to synthesize a multitude of cembrene-type diterpenes. Herein, highly oxygenated cembrenoids, sarcoconvolutum A–E (1–5) were purified and characterized from an ethyl acetate extract of the red sea soft coral, Sarcophyton convolutum. Compounds were assemblies according to spectroscopic methods including FTIR, 1D- and 2D-NMR as well as HRMS. Metabolite cytotoxicity was tested against lung adenocarcinoma, cervical cancer, and oral-cavity carcinoma (A549, HeLa and HSC-2, respectively). The most cytotoxic compound, (4) was observed to be active against cell lines A549 and HSC-2 with IC50 values of 49.70 and 53.17 μM, respectively.
Interaction of methyltin(IV) compounds with carboxylate ligands. Part 2: Formation thermodynamic parameters, predictive relationships and sequesterin…
2008
Thermodynamic data of mono-, di- and tri-methyltin(IV)-carboxylate complexes (acetate, malonate, succinate, oxydiacetate, diethylenetrioxydiacetate, malate, citrate, 1,2,3-tricarballylate, 1,2,3,4-butanetetracarboxylate, 1,2,3,4,5,6-benzenehexacarboxylate) in aqueous solution are reported at t = 25 °C and I = 0 mol l−1. Thermodynamic parameters obtained were analysed to formulate empirical predictive relationships as a function of different parameters, such as the number of carboxylate groups of the ligand and the charge of the alkyltin(IV) cation. Sequestration diagrams of citrate and 1,2,3-tricarballylate towards alkyltin(IV) cations at different pH values are also reported and discussed.…
Comparison of global responses to mild deficiency and excess copper levels in Arabidopsis seedlings
2013
[EN] Copper is an essential micronutrient in higher plants, but it is toxic in excess. The fine adjustments required to fit copper nutritional demands for optimal growth are illustrated by the diverse, severe symptoms resulting from copper deficiency and excess. Here, a differential transcriptomic analysis was done between Arabidopsis thaliana plants suffering from mild copper deficiency and those with a slight copper excess. The effects on the genes encoding cuproproteins or copper homeostasis factors were included in a CuAt database, which was organised to collect additional information and connections to other databases. The categories overrepresented under copper deficiency and copper e…