Search results for "Tween"

Clay-biosurfactant materials as functional drug delivery systems: Slowing down effect in the in vitro release of cinnamic acid

2017

Abstract The main objectives of the present paper were the preparation and characterization of new surfactant-modified clays and the evaluation of their potential applicability as drug delivery systems for the oral administration of the cinnamic acid (CA) drug. The organoclays (OC) were prepared by loading different amounts of the biocompatible nonionic polyoxyethylene sorbitan monolaurate surfactant (Tween20) onto K10 montmorillonite (Mt) clay and characterized through the construction of the adsorption isotherms by means of the spectrophotometric method. The performance of the prepared material was verified by gathering the adsorption isotherms of the cinnamic acid onto the Mt/Tween20 org…

“AD HOC” MODIFIED CLAYS FOR BIOTECHNOLOGICAL APPLICATIONS

Nowadays, the scientific community has to face with cogent problems strictly linked to the improvement of quality of live. Among the different tasks to achieve the prefixed objective the focus has been put on the drug administration, i.e., attention has been paid to propose an appropriate solution to improve the performance of a drug delivery system and to eliminate both the side effect and drawbacks. With the aim to achieve the design, synthesis, and characterization of versatile systems, with peculiar characteristics, based on clays and clays modified with a biocompatible surfactant, able to adsorb and release organic substances of pharmaceutical interest the present PhD thesis has been u…

Register data in sample allocations for small-area estimation

2018

The inadequate control of sample sizes in surveys using stratified sampling and area estimation may occur when the overall sample size is small or auxiliary information is insufficiently used. Very small sample sizes are possible for some areas. The proposed allocation based on multi-objective optimization uses a small-area model and estimation method and semi-collected empirical data annually collected empirical data. The assessment of its performance at the area and at the population levels is based on design-based sample simulations. Five previously developed allocations serve as references. The model-based estimator is more accurate than the design-based Horvitz–Thompson estimator and t…

What Factors have an Influence on A Quality Teaching Practice in Sciences?

2012

Abstract This paper aims to know to what extent in-service teachers who have not participated in science teaching training courses neither have performed any research in this field develop a quality teaching practice and what factors have influenced to achieve it. Questionnaires and non-participating observation protocols about the classroom work have been used as well as semi-structured interviews with a sample of teachers to obtain data. These instruments try to characterize the teaching action and determine what factors and in which degrees have influenced the performance of a quality science teaching activity.

New expressions for string loop amplitudes leading to an ultrasimple conception of string dynamics

1991

New expressions are derived for string loop amplitudes as overlap integrals of string wave functionals. They are shown to take the form of exchange terms coming from the Bose-Einstein symmetrization between string segments. One is thus led to the ultrasimple conception that string theory is basically free, and that ``string interactions'' are merely due to the fact that strings are composite objects with Bose-Einstein segments as constituents.

An Efficient Immunization Strategy Using Overlapping Nodes and Its Neighborhoods

2018

International audience; When an epidemic occurs, it is often impossible to vaccinate the entire population due to limited amount of resources. Therefore, it is of prime interest to identify the set of influential spreaders to immunize, in order to minimize both the cost of vaccine resource and the disease spreading. While various strategies based on the network topology have been introduced, few works consider the influence of the community structure in the epidemic spreading process. Nowadays, it is clear that many real-world networks exhibit an overlapping community structure, in which nodes are allowed to belong to more than one community. Previous work shows that the numbers of communit…

Un sistema formativo ancora da costruire. Riflessioni e proposte per la formazione iniziale degli educatori per la prima infanzia

2022

Mettendo in relazione la formazione iniziale di educatori/educatrici e insegnanti per la prima infanzia con le conoscenze relative allo sviluppo, alle modalità di apprendimento e ai bisogni dei bambini nei primi sei anni di vita, il mio intervento si centra sulla ipotesi di un curriculo formativo unitario. Individua quindi sia le aree disciplinari fondamentali e i possibili contenuti, sia i modelli formativi più efficaci per delineare un profilo professionale specifico, conducendo un approfondimento sull’apprendimento dall’esperienza all’interno dell’Università e sulle modalità di tirocinio maggiormente efficaci. In base alla normativa vigente, delineo poi le criticità del modello formativo…

Arts. 34-40 EIR

2016

The comments on Arts. 34-40 of EU Regulation 2015/848 deal with opening of secondary insolvency proceedings. These comments systematically tackle the prerequisites required for the opening of secondary insolvency proceedings, the relationship between main and secondary proceedings and the duties of cooperation that are put on the courts and the insolvency practitioners of both main and secondary proceedings. A particular attention is devoted to the introduction of the so-called “Undertaking to Avoid the Opening of Secondary Insolvency Proceedings” (Art. 36).

Mutual intelligibility among the sign languages of Belgium and the Netherlands

2015

AbstractIn an exploratory study of mutual intelligibility between the sign languages of the northern part of Belgium (Flemish Sign Language, VGT), the southern part of Belgium (French Belgian Sign Language, LSFB), and the Netherlands (Sign Language of the Netherlands, NGT), we tested the comprehension of VGT by signers of LSFB and NGT. In order to measure the influence of iconic structures (classifier constructions and constructed action) that linguistic analyses have shown to be similar across different sign languages, two genres were compared: narrative and informative signing. To investigate the effect of the overlap between the spoken languages surrounding the Dutch and Flemish Deaf com…

Mens sana in corpore exhausto. Emociones y gestión de sí en escuelas secundarias del sur global

2020

In recent years, emotional education has become a central element in a series of guidelines on a global scale that have been translated into various state initiatives aimed at education. Thus, Mens sana in corpore exhausto proposes to demonstrate the tension that is expressed between the growing series of discourses on emotional education and the school climate and the exhaustive bodies of teachers and directors of public secondary schools in the Metropolitan Region of Buenos Aires (RMBA). By way of hypothesis, these policies are considered to work on the bodies of teachers and directors, encouraging them to continue and not stop under the logic of management and self-management that throw …