Search results for "ètica"
showing 10 items of 343 documents
Apuntes de aritmética y contabilidad
Thermal sensor based on a polymer nanofilm
2016
In this work, we have developed a thermal sensor based on poly(3,4 ethylenedioxythiophene) (PEDOT) nanofilms as thermoelectric material. The PEDOT nanofilms have been synthesized by the electrochemical polymerization method. The thicknesses of the films were around 120 nm. The doping level of PEDOT was controlled by chemical reduction using hydrazine. The achieved Seebeck coeficient is 40 uV/K. A PEDOT nanofilm was integrated into an electronic circuit that amplifies the voltage originated from the Seebeck effect. The temperature increment produced by a fingerprint touching the film is enough to switch on a light emitting diode. Peer Reviewed
Humanismo tecnológico: fundamento para una inteligencia artificial responsable
2019
Los rápidos avances en el campo de la inteligencia artificial (IA) en las últimas décadas ponen de relieve la necesidad de incorporar criterios éticos de responsabilidad. Esa incorporación permitirá el planteamiento de una inteligencia artificial responsable (IAR) que tendrá que fundamentarse en la formulación de un nuevo humanismo. Se entiende que a partir de un humanismo tecnológico se podría impulsar la IAR en el contexto tecnológico actual. Los desafíos de la IA imponen el imperativo de plantear un humanismo de este tipo que asuma un compromiso con miras al futuro. En ese sentido, el humanismo tecnológico representa la exigencia de un tiempo de desafíos tecnológicos y a la vez una prem…
Deficiencias epistemológicas en la enseñanza habitual de los conceptos de campo y potencial eléctrico
1997
This article intends to analyse up to what extent the scarce learning produced when introducing the basic concepts on electrostatics is due to deficiencies and inadequacies in its routine teaching. So, on the one hand, we analyse what have been the principal epistemological leaps forward in the making of electricity as a science. On the other hand, we analyse Physics books and the teachers’ opinions.
Reseña de: Rafael Jiménez Asensio, Cómo prevenir la Corrupción: Integridad y Transparencia
2018
Reseña de: Rafael Jiménez Asensio, Cómo prevenir la Corrupción: Integridad y Transparencia
L-Band vegetation optical depth for crop phenology monitoring and crop yield assessment
2018
Vegetation Optical Depth (VOD) at L-band is highly sensitive to the water content and above-ground biomass of vegetation. Hence, it has great potential for monitoring crop phenology and for providing crop yield forecasts. Recently, the Multi-Temporal Dual Channel Algorithm (MT -DCA) has been proposed to retrieve L-band VOD from Soil Moisture Active Passive (SMAP) measurements. In previous research, SMAP VOD has been compared to crop phenology and has been used to derive crop yield estimates. Here, we review and expand these initial research studies. In particular, we quantify the capability of VOD to detect different crop stages, and test different VOD metrics (i.e., maximum, range and inte…
Figuras de la ausencia. Narrativas y estéticas de la desaparición forzada en Chile
2022
En este trabajo se describen algunas de las operaciones de representación a través de las cuales se han generado, a lo largo del tiempo, narrativas y estéticas en torno al impacto de la desaparición forzada en Chile. A partir del análisis de textos poéticos, el artículo describe un paisaje social caracterizado por la presencia de nombres sin cuerpo y de cuerpos sin nombre. Analiza en relación con ello tres tendencias mayores en los intentos de dar forma al impacto de la desaparición, a través de la puesta en relación de imágenes fotográficas, textos literarios, propuestas artísticas y narraciones audiovisuales. En primer lugar, se acerca a aquellas estéticas que hacen de la ausencia del cue…
Gene expression is circular: factors for mRNA degradation also foster mRNA synthesis.
2013
SummaryMaintaining proper mRNA levels is a key aspect in the regulation of gene expression. The balance between mRNA synthesis and decay determines these levels. We demonstrate that most yeast mRNAs are degraded by the cytoplasmic 5′-to-3′ pathway (the “decaysome”), as proposed previously. Unexpectedly, the level of these mRNAs is highly robust to perturbations in this major pathway because defects in various decaysome components lead to transcription downregulation. Moreover, these components shuttle between the cytoplasm and the nucleus, in a manner dependent on proper mRNA degradation. In the nucleus, they associate with chromatin—preferentially ∼30 bp upstream of transcription start-sit…
Cyclin-dependent kinase inhibitor p21 controls adult neural stem cell expansion by regulating Sox2 gene expression.
2012
Summary In the adult brain, continual neurogenesis of olfactory neurons is sustained by the existence of neural stem cells (NSCs) in the subependymal niche. Elimination of the cyclin-dependent kinase inhibitor 1A (p21) leads to premature exhaustion of the subependymal NSC pool, suggesting a relationship between cell cycle control and long-term self-renewal, but the molecular mechanisms underlying NSC maintenance by p21 remain unexplored. Here we identify a function of p21 in the direct regulation of the expression of pluripotency factor Sox2, a key regulator of the specification and maintenance of neural progenitors. We observe that p21 directly binds a Sox2 enhancer and negatively regulate…
Domain organization and evolution of multifunctional autoprocessing repeats-in-toxin (MARTX) toxin in Vibrio vulnificus.
2011
ABSTRACT The objective of this study was to analyze multifunctional autoprocessing repeats-in-toxin (MARTX) toxin domain organization within the aquatic species Vibrio vulnificus as well as to study the evolution of the rtxA1 gene. The species is subdivided into three biotypes that differ in host range and geographical distribution. We have found three different types (I, II, and III) of V. vulnificus MARTX (MARTX Vv ) toxins with common domains (an autocatalytic cysteine protease domain [CPD], an α / β-hydrolase domain, and a domain resembling that of the LifA protein of Escherichia coli O127:H6 E2348/69 [Efa/LifA]) and specific domains (a Rho-GTPase inactivation domain [RID], a domain of …