Search results for "PC"
showing 10 items of 2805 documents
SOS por la democracia
2010
Subsurface nitrate reduction under wetlands takes place in narrow superficial zones
2017
This study aims to investigate the depth distribution of the Nitrate Reduction Potential (NRP) on a natural and a re-established wetland. The obtained NRP provides a valuable data of the driving factors affecting denitrification, the Dissimilatory Nitrate Reduction to Ammonium (DNRA) process and the performance of a re-established wetland. Intact soil cores were collected and divided in slices for the determination of Organic Matter (OM) through Loss of Ignition (LOI) as well as Dissolved Organic Carbon (DOC) and NRP spiking nitrate in batch tests. The Nitrate Reduction (NR) was fitted as a pseudo-first order rate constant (k) from where NRPs were obtained. NR took place in a narrow superfi…
Characterization of denitrification gene clusters of soil bacteria via a metagenomic approach
2009
International audience; Denitrification is a microbial respiratory process contributing to the emission of greenhouse gas. The study of denitrifying bacteria, like that of others, is hindered by characteristics that can prevent up to 99% of soil bacteria from being cultivated in vitro. New approaches based on the direct extraction of DNA from the natural environment and PCR amplifications can overcome limitations due to bacterial unculturability, but until now their application to denitrification genes has led only to the recovery of partial sequences for some of these genes.Our goals in this study were to apply a metagenomic approach characterized by cloning of DNA extracted from soil and …
Facial Self-Touching and the Propagation of COVID-19: The Role of Gloves in the Dental Practice
2021
Background: Despite facial self–touching being a possible source of transmission of SARS–Co–V–2 its role in dental practice has not been studied. Factors such as anxiety symptoms or threat perception of COVID–19 may increase the possibility of contagion. The objective was to compare the impact of control measures, such as gloves or signs in the reduction in facial self–touching. Methods: An intra–subject design was undertaken with 150 adults. The patients’ movements in the waiting room were monitored with Microsoft Kinect software on three occasions: without any control measures, using plastic gloves or using advisory signs against self–touching. Additionally, the participants completed the…
Upconversion nanoparticles with a strong acid-resistant capping
2016
Water-dispersible upconversion nanoparticles (β-NaYF:Yb,Er, UCNP) coated with a thin shell of a biocompatible copolymer comprising 2-hydroxyethylmethacrylate (HEMA) and 2-acrylamido-2-methyl-1-propanesulphonsulphonic acid (AMPS), which we will term COP, have been prepared by multidentate grafting. This capping is remarkably resistant to strong acidic conditions as low as pH 2. The additional functionality of the smart UCNP@COP nanosystem has been proved by its association to a well-known photosensitizer (namely, methylene blue, MB). The green-to-red emission ratio of the UC@COP@MB nanohybrid exhibits excellent linear dependence in the 7 to 2 pH range as a consequence of the release of the d…
Corruptos y gloriosos / 1
2008
MÁS ALLÁ DE LOS DESAFÍOS DEL DECENIO DE LA EDUCACIÓN PARA EL DESARROLLO SOSTENIBLE: UNA REFLEXIÓN NECESARIA
2017
La temática central del artículo se vincula a las discusiones llevadas a cabo por el Decenio de la Educación para el Desarrollo Sostenible (2005-2014) y tiene el objetivo de presentar las contribuciones del Decenio como herramienta de convergencia internacional que impulsó y fortaleció la comprensión de la educación como herramienta esencial para el desarrollo Sostenible y contribuyó a una percepción holística del estado mundial con la finalidad de generar actitudes y responsabilidades en la dirección del desarrollo sostenible, un modelo de desarrollo que satisface las necesidades del presente sin comprometer las necesidades de las futuras generaciones. Para ello, se discute y problematiza …
Visiones del Profesorado de Primaria sobre Materiales Didácticos Digitales
2019
En este artículo se analizan las percepciones del profesorado de quinto y sexto de educación Primaria en torno a la valoración, uso y formación del profesorado sobre Materiales Didácticos Digitales (en adelante MDD). Para ello se han realizado entrevistas semiestructuradas a docentes de tres Comunidades Autónomas (Galicia, Canarias y Valencia). En este trabajo de corte cualitativo los resultados manifiestan que el profesorado considera necesario utilizar en las aulas este tipo de recursos ya que están muy presentes en la vida cotidiana del alumnado. Asimismo, abogan por la creación de sus propios materiales con el fin de adaptarlos a las características particulares del grupo-clase, proporc…
Una corografia de la Ciutat i Regne de València a la Crónica de Viciana (1564-1566)
2001
La Crónica de la ínclita y coronada ciudad de Valencia y de su reino (1564-1566) constituye un extenso tratado histórico donde Rafael Martí de Viciana (1502-1582) alabó sus excelencias desde los tiempos de la conquista cristiana. Para escribir la Crónica, el autor visitó numerosos lugares para consultar sus archivos y aprovechó sus estancias para practicar un reconocimiento corográfico de las villas y ciudades. Por ello, la Crónica es una mezcla de narración histórica y de descripción corográfica de la ciudad y reino de Valencia. En la presente investigación, sólo se atiende a los aspectos descriptivos del territorio dispersos a lo largo de la Crónica. Para ello, primero se aporta un breve …
XRF analysis to identify historical photographic processes: The case of some Interguglielmi Jr.’s images from the Palermo Municipal Archive
2017
Abstract In the early period, even though professional photographers worked with similar techniques and products, their artistic and commercial aims determined different choices and led them to follow different, often personal, recipes. For this reason, identification of the techniques through date and name of the photographer or through some visual features like colour, tonality and surface of the image layer, often needs further investigation to be proved. Chemical characterization, carried out in a non or micro destructive way, can be crucial to provide useful information about the original composition, degradation process, realization technique, in obtaining an indirect dating of the ph…