Search results for "Absorció"
showing 10 items of 31 documents
Adjusted Normalized Emissivity Method for surface temperature and emissivity retrieval from optical and thermal infrared remote sensing data
2003
[1] A methodology for the retrieval of surface temperatures and emissivities combining visible, near infrared and thermal infrared remote sensing data was applied to Digital Airborne Imaging Spectrometer (DAIS) data and validated with coincident ground measurements acquired in a multiyear experiment held in an agricultural site in Barrax, Spain. The Adjusted Normalized Emissivity Method (ANEM) is based on the use of visible and near infrared data to estimate the vegetation cover and model the maximum emissivity according to the Vegetation Cover Method. The pixel-dependent maximum emissivity is used as the initial guess of the Normalized Emissivity Method to obtain the surface temperature an…
Influence of Chemical Enhancers and Iontophoresis on the In Vitro Transdermal Permeation of Propranolol: Evaluation by Dermatopharmacokinetics
2018
[EN] The aims of this study were to assess, in vitro, the possibility of administering propranolol transdermally and to evaluate the usefulness of the dermatopharmacokinetic (DPK) method in assessing the transport of drugs through stratum corneum, using propranolol as a model compound. Four chemical enhancers (decenoic and oleic acid, laurocapram, and R-(+)-limonene) and iontophoresis at two current densities, 0.25 and 0.5 mA/cm(2) were tested. R-(+)-limonene, and iontophoresis at 0.5 mA/cm(2) were proven to be the most efficient in increasing propranolol transdermal flux, both doubled the original propranolol transdermal flux. Iontophoresis was demonstrated to be superior than the chemical…
Bases fisiológicas de la regeneración ósea I: histología y fisiología del tejido óseo
2006
El hueso es el único tejido del organismo capaz de regenerarse, permitiendo la restitutio ad integrum tras el trauma. Cuando se produce una fractura, se coloca un implante osteointegrado o se realiza un injerto para aumentar el sustrato óseo antes de la inserción de implantes, lo que se pretende es la regeneración ósea, es decir, la formación de hueso nuevo que, tras un proceso de remodelado, sea idéntico al preexistente. El hueso es un tejido dinámico en constante formación y reabsorción. Este fenómeno equilibrado, denominado proceso de remodelado, permite la renovación de un 5-15 % del hueso total al año en condiciones normales (1). El remodelado óseo consiste en la reabsorción de una can…
Bases fisiológicas de la regeneración ósea II: el proceso de remodelado
2006
El remodelado óseo es un proceso de reestructuración del hueso existente, que está en constante formación y reabsorción. Este fenómeno equilibrado permite, en condiciones normales, la renovación de un 5-10% del hueso total al año. A nivel microscópico el remodelado óseo se produce en las unidades básicas multicelulares, donde los osteoclastos reabsorben una cantidad determinada de hueso y los osteoblastos forman la matriz osteoide y la mineralizan para rellenar la cavidad previamente creada. En estas unidades hay osteoclastos, macrófagos, preosteoblastos y osteoblastos y están regidos por una serie de factores, tanto generales como locales, permitiendo el normal funcionamiento del hueso y e…
Formulation of liposomes loading lentisk oil to ameliorate topical delivery, attenuate oxidative stress damage and improve cell migration in scratch …
2021
[EN] Pistacia lentiscus L. is a sclerophyllous shrub capable of growing under harsh climatic conditions especially in the Mediterranean Basin. Different products can be obtained from this plant, such as essential oil, mastic gum or even fixed oil. The last is well known for its flavor which is mainly exploited in the food industry. Additionally, it has been traditionally used in the treatment of skin diseases, but, at the moment, any suitable formulation for skin delivery has been formulated and its biological effects was not deeply confirmed. Given that, in the present study, the lentisk oil has been formulated in liposomes at different concentrations (10, 20, 30 mg/ml) and their physicoch…
Prevention of Rat Intestinal Injury with a Drug Combination of Melatonin and Misoprostol
2020
A healthy intestinal barrier prevents uptake of allergens and toxins, whereas intestinal permeability increases following chemotherapy and in many gastrointestinal and systemic diseases and disorders. Currently, there are no approved drugs that target and repair the intestinal epithelial barrier while there is a medical need for such treatment in gastrointestinal and related conditions. The objective of this single-pass intestinal perfusion study in rats was to investigate the preventive cytoprotective effect of three mucosal protective drugs&mdash
Blood absorption capacity of different xenograft bone substitutes. An in-vitro study
2019
Background Commercially available xenograft blocks, claim to have adequate characteristics to interact with biological media and thus permitting biological fluid absorption. The objective of this in vitro study was to compare the blood absorption capacity of four different xenograft block materials of different composition of collagen and porosity. Material and Methods Four brands of xenograft block materials were used (NuOss®, Bio-Oss®, Osteobiol® and Smartbone®). Five samples of each brand were analyzed, making a total of 20 tests. Human blood was used as the absorption liquid for the present experiment. The time period, in which the block remains in contact with the blood, was registered…
Bibliometric analysis of the international literature on open innovation and absorptive capacity
2016
Objecte: Comprovar si existeix, i si ha estat estudiada o demostrada, l’estreta relació, suggerida per alguns autors, entre innovació oberta i capacitat d’absorció. Disseny/metodologia: Anàlisi bibliomètrica sobre la Web of Science de la literatura internacional on es tracten ambdós termes simultàniament. Aportacions i resultats: S’ha demostrat que és un camp de creixent interès i que existeix una estreta relació entre innovació oberta i capacitat d’absorció. Limitacions: Els biaixos propis de utilitzar la base de dades elegida i els criteris de selecció aplicats fan possible la no inclusió d’algun article significatiu. Implicacions pràctiques: Conèixer que la capacitat d’absorció té relaci…
Spectral Transmission of the Human Corneal Layers
2021
Este artículo se encuentra disponible en la siguiente URL: https://www.mdpi.com/2077-0383/10/19/4490 Este artículo de investigación pertenece a la sección "Ophthalmology". We have assessed the spectral transmittance of the different layers of the human cornea in the ultraviolet (UV), visible, and near-infrared (IR) spectral ranges. Seventy-four corneal sample donors were included in the study. Firstly, the corneal transmittance was measured using a spectrophotometer. Then, all samples were fixed for histopathological analysis, which allowed us to measure the thickness of each corneal layer. Finally, the absorption coefficients of the corneal layers were computed by a linear model reproducin…
La transferencia de conocimiento externo y el desempeño organizativo en las empresas colombianas: el papel mediador de la capacidad de absorción de c…
2017
La turbulencia del entorno empresarial es un factor que ayuda a explicar por qué el conocimiento organizacional se ha convertido en un recurso estratégico clave para las organizaciones en los últimos tiempos y, si es bien gestionado, puede dar lugar a capacidades organizativas (Teece et al., 1997) que generen y mantengan ventajas competitivas sostenibles (Lyles y Salk, 1996; Zahra et al., 2000; Tsai, 2001; Chaston et al., 2001). De esta manera, todos los procesos vinculados a la gestión del conocimiento, en general, y su transferencia, en particular, han adquirido una relevancia estratégica de grandes proporciones a la hora de incrementar los niveles de competitividad de las empresas actual…