Search results for "HTTP"
showing 10 items of 580 documents
Electrochemical characterization of mangrove sediments: A proposal of new proxies for organic matter oxidation
2019
Abstract The voltammetric response of microparticulate deposits resulting from solvent evaporation of ethanolic extracts of mangrove sediments in contact with aqueous acetate buffer is hereby described. Dated sediment cores sampled from the Peruvian mangrove system (“Manglares de Tumbes” National Sanctuary) presented voltammetric responses dominated by oxidative signals of organic components that exhibit significant variations depending on the depth. Voltammetric data allowed for the definition of electrochemical indexes representative of the electrochemically oxidable organic matter fraction. These electrochemical indexes were fEAOM (for the total amount of organic matter being electrochem…
El tiempo en las clases de programación: ''Hacés y hacés y no te importa si tocó el timbre''
2021
A través de un estudio de caso en tres escuelas secundarias técnicas con orientación en programación se realizó una investigación cualitativa de corte etnográfica en la que se registraron los modos en que las y los estudiantes resuelven tareas de programación y organizan sus momentos de descanso. Recuperando las experiencias estudiantiles, se pudo observar cómo vivencian el tiempo cuando hay proyectos con desafíos cognitivos interesantes, en donde los cortes en su jornada escolar están fuertemente vinculados a la resolución de actividad escolar propuesta en vez de la estructura del horario escolar. Los recreos se ligan al sentido de la tarea, donde los descansos se vinculan a tres momentos …
Como as práticas ecológicas e o desperdício de alimentos influenciam o capital de marca do restaurante?
2020
Resumen El presente trabajo tuvo por objetivo evaluar la incidencia de las prácticas verdes, la innovación sostenible y el manejo del desperdicio alimentario en la construcción del capital de marca de los restaurantes. A partir de una investigación cuantitativa dirigida a responsables de restaurantes en Ecuador, se obtuvieron 120 cuestionarios válidos que permitieron estimar un modelo de ecuaciones estructurales a través de la regresión de mínimos cuadrados parciales. Los resultados obtenidos evidencian que las prácticas verdes orientadas a la formación del empleado y la innovación sostenible contribuyen significativamente a la reducción del desperdicio alimentario, que, a su vez, junto a l…
Efeitos da sustentabilidade e valor logístico nas relações entre empresas de transporte marítimo
2020
Resumen El objetivo de este trabajo fue analizar cómo la sostenibilidad (económica, social y ambiental), bajo el enfoque de triple línea base, afecta la calidad de servicio, el valor logístico y la satisfacción en empresas del sector marítimo. Se propone un modelo teórico que se contrasta con la información suministrada por una muestra de 50 responsables de empresas (transitarios, importadores y exportadores) en Panamá. La información se analiza mediante la estimación de regresión por mínimos cuadrados parciales, que permite confirmar el carácter multidimensional de la sostenibilidad y del valor logístico. Los resultados también confirman que las percepciones de los clientes sobre las inici…
Early Warning Systems for Food Security in West Africa: Evolution, Achievements and Challenges
2010
In West Africa, early warning systems (EWSs) for food security have been widely recognized to have contributed, in the last 20 years, to an improved ability to deal with famine emergencies. Nevertheless, despite the advancements in understanding of the environmental and socio-economic dynamics and despite the improved technologies, tackling food security remains a difficult task for decision makers as demonstrated by local food crises in many countries of the region. African Monsoon Multidisciplinary Analysis, while improving the understanding of the monsoon system, allowed us to better orient research challenges to provide EWS with improved products, effectively meeting the needs of end-us…
Rice cooking and sensory quality
2019
International audience; This chapter provides a state-of-the-art review of the diversity and dynamics of consumer demand with respect to the eating quality of rice worldwide. Quality includes both tangible measurable factors (rice characteristics) and the context of consumption. The main sensory attributes evaluated around the world are described, and their relationship with the diversity of consumer demand is discussed. Instrumental methods for predicting quality measured on either raw or cooked grains are reviewed. The changes that occur in the rice grain during cooking are described along with a modeling approach able to predict the changes and their spatial distribution in the rice grai…
Effects of garlic powders with varying alliin contents on hepatic drug metabolizing enzymes in rats
2003
International audience; The anticarcinogenic effect of garlic has been demonstrated in both epidemiologic and experimental studies. In this study, possible mechanisms involved in the anticarcinogenic effect of garlic consumption were assessed by determining its capacity to alter drug metabolizing enzymes, in relation with its alliin content. Rats were fed a diet for 2 weeks containing 5% garlic powders produced from bulbs grown on soils with different levels of sulfate fertilization and therefore containing differing amounts of alliin. Activities of several hepatic enzymes, which are important in carcinogen metabolism such cytochromes P450 (CYP) and phase II enzymes, were determined. Garlic…
DNA Oxidation Photoinduced by Norharmane Rhenium(I) Polypyridyl Complexes: Effect of the Bidentate N,N′-Ligands on the Damage Profile
2018
Re(I)--polypyridyl complexes have interesting and distinctive photochemical and photosensitizing properties. This work describes the capability to induce (or photoinduce) DNA damage of three Re(I)-complexes with a naturally occurring alkaloid called norharmane (nHo) as ligand: [Re(CO)₃ (nHo)(L)]CF₃ SO₃ where L=2,2'-bipyridine (ReBpy), phenanthroline (RePhen) or dipyrido[3,2-a:2',3'-c]phenazine (ReDppz). The interaction of the complexes with DNA was investigated by steady-state and time-resolved spectroscopy. Data show that the mode and strength of interaction depend on the chemical structure of the bidentate ligand. The complexes show a major static contribution to the overall interaction, …
Peter Senge puolustaa luontoa ja luonnollista oppimista
2002
Peter Senge on eniten siteerattuja kirjoittajia, kun puhutaan oppivista organisaatioista. Hänen tunnetuin kirjansa The Fifth Discipline ilmestyi Yhdysvalloissa vuonna 1990 ja sai miltei kulttikirjan maineen. Sengeä pidetään ihmisenä, joka tietää hyvin paljon oppivan organisaation kysymyksistä, hän on jotakin tällä alueella. Ennakkokuva vahvasta osaajasta oli vankkumaton lupautuessani haastattelemaan Sengeä. Tapaaminen muutti ennakkokäsityksiäni ja -odotuksiani.
Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton
2017
Context. The Vela supernova remnant displays several ejecta, which are fragment-like features protruding beyond the front of its primary blast shock wave. They appear to be "shrapnel", bowshock-shaped relics of the supernova explosion. One of these pieces of shrapnel (A), located in the northeastern edge of the remnant, is peculiar because its X-ray spectrum exhibits a high Si abundance, in contrast to the other observed ejecta fragments, which show enhanced O, Ne, and Mg abundances. Aims. In this Letter we present the analysis of another ejecta fragment located opposite to shrapnel A with respect to the center of the shell, in the southwestern boundary of the remnant, named shrapnel G. We …