Search results for "DEVICES"
showing 10 items of 615 documents
New perspectives in the use of semipermeable membrane devices as passive samplers.
2007
This review shows the state of the art, from 2000 to nowadays, of the use of semipermeable membrane devices (SPMDs) for monitoring persistent organic pollutants in both, air and aquatic environments. Since their first use in 1990, SPMDs have been employed for many environmental purposes, like air and water pollution monitoring. We have focussed the study in three subjects: (i) novel compounds accumulated by SPMDs, (ii) modifications of SPMDs to improve their specific uptake properties and (iii) alternatives in sample pre-treatment for the determination of pollutants accumulated in SPMDs.
Production and physicochemical characterization of a new amine derivative of gellan gum and rheological study of derived hydrogels
2020
The production of an amine derivative of gellan gum, named GG-EDA, was here obtained by functionalizing the polysaccharide backbone with pendant ethylenediamine moieties. The obtained derivative was characterized by spectroscopic, colorimetric, chromatographic and rheological analyses to study the effect of the free amino groups on the physicochemical properties of the macromolecule. A titration experiment was conducted to study the acid-base dissociation constants in aqueous media for the carboxylic and amino groups in the GG-EDA and to shed light on the possibility that the derivative shows a polyampholyte structure under physiological conditions. The rheological analysis conducted on bot…
"Writing biochips": high-resolution droplet-to-droplet manufacturing of analytical platforms.
2022
The development of high-resolution molecular printing allows the engineering of analytical platforms enabling applications at the interface between chemistry and biology, i.e. in biosensing, electronics, single-cell biology, and point-of-care diagnostics. Their successful implementation stems from the combination of large area printing at resolutions from sub-100 nm up to macroscale, whilst controlling the composition and the volume of the ink, and reconfiguring the deposition features in due course. Similarly to handwriting pens, the engineering of continuous writing systems tackles the issue of the tedious ink replenishment between different printing steps. To this aim, this review articl…
Novel Iron(II) Microporous Spin-Crossover Coordination Polymers with Enhanced Pore Size
2012
In this Communication, we report the synthesis and characterization of novel Hofmann-like spin-crossover porous coordination polymers of composition {Fe(L)[M(CN)4]}·G [L = 1,4-bis(4-pyridylethynyl)- benzene and MII = Ni, Pd, and Pt]. The spin-crossover properties of the framework are closely related to the number and nature of the guest molecules included in the pores.
Manejo perioperatorio de pacientes con sospecha o infección grave por coronavirus SARS-CoV-2 programados para implante de dispositivos electrónicos p…
2020
Resumen La infeccion por SARS-CoV-2 ha evolucionado hasta convertirse progresivamente en una pandemia declarada por la Organizacion Mundial de la Salud (OMS) que ha obligado a las organizaciones de salud a nivel mundial, regional y local a adoptar una serie de medidas para hacer frente al COVID-19 e intentar disminuir su impacto, no solo en el ambito social sino tambien en el ambito sanitario, modificandose las pautas de actuacion en los servicios de salud. Dentro de estas recomendaciones que incluyen las Unidades de Tratamiento del Dolor, los pacientes con sospecha o infeccion confirmada por SARS-CoV-2 pueden encontrase en situacion de espera para intervencion no demorable para implante o …
A dynamic model for hysteresis in magnetostrictive devices
2014
In this paper, a dynamic model for the description and design of hysteresis in magnetostrictive devices is presented. The model is based on Preisach theory and its dynamic extension. A procedure for determining the Preisach distribution function is given. This procedure is based on neural networks. The model is able to reconstruct both the magnetization relation and the field-strain relation. The model is validated through comparison and prediction of data collected from a typical Terfenol-D sample and a novel experimental technique dedicated to the validation of dynamic models is proposed.
Generating students' information seeking questions in the scholar lab: what benefits can we expect from inquiry teaching approaches?
2013
ABSTARCT: Physics teachers use experimental devices to show students how scientific concepts, principles, and laws are applied to understand the real world. This paper studies question generation of secondary and under-graduate university students when they are confronted with experimental devices in different but usual teaching situations: reading about devices while studying still images or diagrams, watching an experimental demonstration, and handling the devices in the laboratory. The influence of the prior scientific knowledge on the questions asked is also analysed. Inquiry learning environments, involving lab projects, seemed to stimulate more inferences addressed to causality when s…
Exposed Subcutaneous Implantable Devices
2015
Background: Implantable venous and electrical devices are prone to exposure and infection. Indications for management are controversial, but—especially if infected—exposed devices are often removed and an additional operation is needed to replace the device, causing a delay in chemotherapy and prolonging healing time. We present our protocol for device salvage, on which limited literature is available. Methods: Between 2007 and 2013, 17 patients were treated (12 venous access ports, 3 cardiac pacemakers, and 2 subcutaneous neural stimulators). Most patients were operated within 7 days from exposure. All patients received only a single perioperative dose of prophylactic antibiotic. In cases …
Can Interactive Mediation Tools Bridge the Identity Gap Between the Public and the Art Museum?
2015
International audience; Consumer behaviour in the field of art museums appears to be influenced both by the identity of the public and the art museum and by the context. It is a matter not of changing museum content, but of bringing its identity closer to that of the public in order to promote access to art. The authors first present the theoretical and conceptual framework for their research and then suggest a qualitative methodological approach to addressing the issues described in the results.; La conducta del consumidor en los museos de arte parece estar influenciada tanto por la identidad del público y del museo como por el contexto. No se trata de cambiar el contenido del museo, pero …
Pterostilbene-induced tumor cytotoxicity: a lysosomal membrane permeabilization-dependent mechanism.
2012
The phenolic phytoalexin resveratrol is well known for its health-promoting and anticancer properties. Its potential benefits are, however, limited due to its low bioavailability. Pterostilbene, a natural dimethoxylated analog of resveratrol, presents higher anticancer activity than resveratrol. The mechanisms by which this polyphenol acts against cancer cells are, however, unclear. Here, we show that pterostilbene effectively inhibits cancer cell growth and stimulates apoptosis and autophagosome accumulation in cancer cells of various origins. However, these mechanisms are not determinant in cell demise. Pterostilbene promotes cancer cell death via a mechanism involving lysosomal membrane …