Search results for "RILL"
showing 10 items of 1272 documents
Neurons and ECM regulate occludin localization in brain endothelial cells
2000
We report that extracellular matrix and neurons modulate the expression of occludin, one of the main components of tight junctions, by rat brain endothelial cells (RBE4.B). Of the three extracellular matrix proteins which we tested (collagen I, collagen IV, and laminin), collagen IV stimulated at the best the expression of occludin mRNA. The corresponding protein, however, was not synthesized. Significant amounts of occludin accumulated only when RBE4.B cells were cultured on collagen IV-coated inserts, in the presence of cortical neurons, plated on laminin-coated companion wells. Finally, occludin segregated at the cell periphery, only when endothelial cells were co- cultured with neurons …
Determination of Synchronization of Electrical Activity in the Heart by Shannon Entropy Measure
2005
In this paper we propose a new index of synchronization for the study of heart’s electrical activity during atrial fibrillation (AF). The index relies on the measure of the time delays between correspondent activations in two atrial electrograms and on the characterization of their dispersion by a measure of Shannon Entropy. The algorithm was validated on simulated signals mimicking different degree of synchronization. Results showed the index was able to discriminate among different levels of organization, provided that it works on series of at least 50 activations (time resolution of almost 10 sec during AF). Moreover, we applied the algorithm to real bipolar electrograms, obtained from a…
The Phycosiphon record in the Ladrilleros-Juanchaco section (Miocene, Colombian Pacific): palaeoecological implications
2018
Miocene rocks of the Ladrilleros-Juanchaco section, located on the NW margin of South America, contain a high diverse and abundant trace fossil assemblage. The relative abundance of Phycosiphon, together with its morphological variations, provides new insights into the environmental conditions. Detailed outcrop stratigraphic, ichnological, and geochemical analyses carried out in the section focused on the trace fossil assemblages (distribution, relative abundance), ichnofabric index, and, especially, in the general ichnological features of Phycosiphon . In addition, the detailed photographic documentation and the use of the digital image treatment technique facilitate the precise study of …
Weighing Scales Manufacturers
2014
The history of scales manufacturing and of some important existing scales workshops is summarised. A table presents the most important existing manufacturers and their company profiles.
Plot rill erosion measurements by close-range photogrammetry using natural events at Sparacia experimental area
2018
Recently, many investigations were carried out in order to check the applicability of both close-range and UAV (Unmanned Aerial Vehicle) photogrammetry to measure soil erosion processes. For measuring rill erosion occurring on a 22 m long and 26% sloped plot occurred on 24 October 2016 at the Sparacia experimental area, a terrestrial photographic relief and a low altitude aerial relief were carried out by no-professional quadricopter and camera. The three-dimensional (3D) DTM and the quasi-tridimensional (DEM) models were obtained. An extraction method of the rill network using DEM and convergence index was applied and a subsequent separation of rills into contributing and non-contributing …
Transgresiones de la historia. La misión pública de la historia y la dialéctica científica
2020
España como detonante de la modernidad: Fortuna crítica de lo español en el arte europeo y norteamericano, 1808-1918
2022
A través del estudio de la fortuna crítica del arte de un determinado período es posible conocer, no solamente, cómo llegó a difundirse un modelo artístico, sino también cómo ha sido sucesivamente valorado, por qué y cuál ha sido su influencia. Por lo que respecta a la recuperación de lo español durante el siglo XIX fueron fundamentalmente franceses e ingleses quienes la llevaron a cabo. En este sentido, el enorme reconocimiento que en el ámbito internacional alcanzó la pintura del Siglo de Oro español, consiguiendo una difusión cada vez mayor, representó un papel de importancia decisiva en el desarrollo de la plástica occidental desde el momento en el que artistas románticos, realistas o i…
Imágenes de barro. Las figurillas cerámicas mayas de La Blanca (Petén, Guatemala) en su contexto regional
2015
La presente tesis doctoral se centra en el estudio de las figurillas cerámicas halladas en el antiguo asentamiento urbano maya de La Blanca, ubicado en el Departamento del Petén en Guatemala. En las excavaciones arqueológicas efectuadas por el Proyecto La Blanca en este sitio arqueológico, bajo la dirección de la Dra. Cristina Vidal Lorenzo y el Dr. Gaspar Muñoz Cosme, se ha recuperado cerca de un millar de figurillas, procedentes en su mayoría del principal conjunto monumental, la majestuosa Acrópolis. Asimismo, un importante porcentaje de las mismas pertenece a contextos arqueológicos de especial relevancia e interés, al encontrarse éstos asociados a los momentos finales del período Clási…
L'epidemia que mai va existir: València davant la febre groga del 1870
1998
A finales de 1870 se declaró una epidemia de fiebre amarilla en diversos lugares de la costa mediterránea peninsular que afectó por primera vez de forma clara a la ciudad de Valencia. El presente artículo se propone analizar las circunstancias que rodearon la llegada de la epidemia, las etapas de la respuesta política ante la amenaza sanitaria que planteaba, la limitación de los recursos preventivos de que disponía la sociedad valenciana, la hipocresía oficial frente al reconocimiento de los hechos y las medidas adoptadas de aislamiento y control. Se analiza también el papel de la medicina como instrumento de la acción política y las repercusiones sociales y económicas de la epidemia sobre …
Geoethical education: A critical issue for geoconservation
2013
Some geological outcrops have a special scientific or educational value, represent a geological type locality and/or have a considerable aesthetical/photographic value. Such important outcrops require appropriate management to safeguard them from potentially damaging and destructive activities. Damage done to such rock exposures can include drill sampling by geologist for scientific purposes. In this work, we show how outcrops important to structural geology and petrology can be damaged unnecessarily by drill coring. Unfortunately, regulation and protection mechanisms and codes of conduct can be ineffective. The many resources of geological information available to the geoscientist communit…