Search results for "PLANT"
showing 10 items of 11944 documents
Regulación espacio-temporal de la homeostasis del cobre en Arabidopsis thaliana
2013
El cobre y el hierro son nutrientes esenciales para los seres vivos aerobios y sus potenciales redox son utilizados en las reacciones de transferencia de electrones. Sin embargo, esta capacidad redox resulta tóxica cuando los metales de transición entran en contacto con intermediarios del metabolismo aerobio, conocidos como ROS (reactive oxygen species). Los organismos aerobios han desarrollado estrategias homeostáticas para mantener los niveles de los metales adecuados en la célula y distribuir, espacial y temporalmente, los procesos de transporte y tráfico intracelular de metales para minimizar el daño oxidativo al resto de procesos celulares. En este sentido, recientemente se ha demostra…
Reinervación cardiaca tras trasplante cardiaco : valoración clínica, funcional e isotópica en el primer año tras trasplante
2013
El trasplante cardiaco supone un estado de denervación cardiaca completa con implicaciones fisiológicas, clínicas y funcionales. En los últimos años, diversos grupos han demostrado mediante diversas técnicas la existencia de un fenómeno de reinervación cardiaca tras el trasplante que podría tener implicaciones funcionales. El presente trabajo doctoral pretende concretar la existencia de este fenómeno de reinervación durante los primeros doce meses tras la cirugía. Además, plantea un enfoque multidisciplinar para el estudio de la inervación cardiaca incluyendo herramientas de medicina nuclear, pruebas de esfuerzo, valoración de calidad de vida y parámetros electrocardiográficos relacionados …
Toward farm-level health management of wind turbine systems: status and scope for improvements
2018
An outline of health management for OWFs has been detailed in this chapter with description of various important elements. The need for such farm level management is explained and benefits are discussed. Key gaps to be filled in order to realize such a system are identified. The proposed health management system is mainly based on the existing knowledge of fleet-level management in the aerospace sector. Health management is much broader than CM; there are a number of aspects beyond the prognostics capabilities that are to be designed in order to arrive at a comprehensive maintenance management scheme. A comprehensive maintenance program that is sensitive to the health of the assets and adap…
Determination of Changes in the Quality of Surface Water in the River—Reservoir System
2021
Assessing the changing parameters of water quality at different points in the river–reservoir system can help prevent river pollution and implement remedial policies. It is also crucial in modeling water resources. Multivariate statistical analysis is useful for the analysis of changes in surface water quality. It helps to identify indicators that may be responsible for the eutrophication process of a reservoir. Additionally, the analysis of the water quality profile and the water quality index (WQI) is useful in assessing water pollution. These tools can support and verify the results of a multivariate statistical analysis. In this study, changes in water quality parameters of the Turawa r…
Optimization of Spray-Drying Process of
2019
Jerusalem artichoke is an important natural matrix for inulin production. In this experiment, response surface methodology (RSM) was employed to optimize the spray-drying parameters in order to determine the maximal inulin yield. For this study, three independent variables (heating temperature (Tª, 110–120 °C), creep speed (V, 18–22 rpm) and pressure (P, 0.02–0.04 MPa)) were used in the experimental design. Using the Box–Behnken design, the optimal parameters obtained were: drying temperature 114.6 °C, creep speed 20.02 rpm, and pressure: 0.03 MPa. The inulin yield, water content and particle size of inulin obtained by spray-drying and freeze-drying were compared. In this regard, the spray-…
Bioindicadores leñosos para conocer los cambios climáticos y antrópicos en Portugal
2012
Los carbones recuperados en contextos arqueológicos son bioindicadores claves para reconstruir la historia de las especies vegetales, su área de repartición espacial y cronológica. Su identificación botánica es una herramienta precisa para descifrar los cambios climáticos y las actividades humanas en el territorio, ya que las especies vegetales se pueden datar directamente por Acelerador de Espectrometría de Masas (ASM) para interpretar los cambios. En el presente trabajo revisamos los datos antracológicos de Portugal para identificar y distinguir los bioindicadores climáticos y antrópicos, y situarlos en una secuencia temporal basada fundamentalmente en las mencionadas dataciones asm.
Tree species influences diversity of ground-dwelling insects in afforested fields
2015
Abstract Impaired natural ecosystems, such as agricultural lands, are restored toward original or other target stage. Because the long agricultural history has changed the physical, chemical and biological features of the soil, afforested fields can harbor novel species assemblages and interactions. Our overall aim was to quantify the diversity of ground beetles and ants in early successional afforested fields. In a large scale field experiment, we compared plots that had been afforested 25 years ago by planting monocultures of birch, pine or spruce trees. A total of 4080 carabid individuals representing 41 species, and 131,933 ant individuals representing 15 species were recorded. Both the…
Restoration of a XVII Century’s predella reliquary: From Physico-Chemical Characterization to the Conservation Process
2021
We report on the restoration of a XVII century’s predella reliquary, which is a part of a larger setup that includes a wall reliquary and a wooden crucified Christ, both belonging to the church of “Madre Maria SS. Assunta”, in Polizzi Generosa, Sicily, Italy. The historical/artistic and paleographic research was flanked successfully by the scientific objective characterization of the materials. The scientific approach was relevant in the definition of the steps for the restoration of the artefact. The optical microscopy was used for the identification of the wood species. Electron microscopy and elemental mapping by energy-dispersive X-ray (EDX) was successful in the identification of the l…
Phytochemical investigation of the needles of Abies nebrodensis (Lojac.) Mattei
2019
Abies nebrodensis (Lojac.) Mattei (Pinaceae) is a species living in a very small population only in a confined area of Sicily. In this study, the dichloromethane extract of the leaves was analyzed. Apart from three already known metabolites namely dehydroabietic acid; maltol; and rheosmin, previously detected in other species of Abies, a lanostane derivative was isolated. Its chemical structure was elucidated by means of extensive spectroscopic methods.
Trattamento riabilitativo interventistico ecoguidato nella fascite plantare
2013
Con il termine "fascite plantare" si intende un processo infiammatorio della aponeurosi o fascia plantare, strettamente correlato ai microtraumi che il piede sopporta durante la falcata. Nel periodo compreso tra giugno 2011 e gennaio 2013 sono stati reclutati presso l'U.O.C di Riabilitazione dell'A.O.U.P. Paolo Giaccone, 78 pazienti affetti da fascite plantare monolaterale e trattati con 3 infiltrazioni di metilprednisolone acetato e lidocaina in sede dolorosa sull'inserzione calcaneare della fascia sotto guida ecografica e prescrizione di un'ortesi plantare. I dati ottenuti dimostrano risultati soddisfacenti nella riduzione della sintomatologia algica nel breve, medio e lungo termine.