Search results for "CTA"
showing 10 items of 9379 documents
Dialogue instead of a monologue : advertisers' expectations towards the media
2011
Stakeholders’ expectations can define the future of the media. Due to advertising revenues, producing audiences desirable for advertisers has been considered as a central function of media. Furthermore, it has been claimed that mass media today would not exist without advertisers. If media organizations want to survive, they will have to acknowledge the expectations that their stakeholders such as advertisers have towards them in the new media environment. Even though meeting stakeholders’ expectations can be crucial for an organization’s future in terms of legitimacy and reputation, expectations have been an understudied topic in organizational communication. The aim of this research was t…
Relación del margen de resección con la supervivencia global y supervivencia libre de enfermedad de los pacientes afectos de metástasis hepáticas de …
2015
Actualmente, la resección hepática junto con la quimioterapia representa el único tratamiento curativo para las metástasis hepáticas de carcinoma colorrectal (MHCCR), con unas tasas de supervivencia a 5 años de hasta el 58%.1 Los últimos avances en supervivencia se deben a múltiples factores.2 Por una parte, a las nuevas estrategias quirúrgicas (embolización portal preoperatoria, hepatectomía en dos tiempos, etc); así como a la mejor selección de pacientes candidatos a cirugía en base a las nuevas definiciones de resecabilidad.3-5 Y por supuesto, al desarrollo de una quimioterapia más efectiva y de nuevos agentes biológicos para el tratamiento de los pacientes con MHCCR.6-10 El papel del ma…
Surfactant self-assembling in the gas phase: bis(2-ethylhexyl)- sulfosuccinate divalent metal ion anionic aggregates
2012
RATIONALE: Investigation of fundamental aspects driving surfactant self-assembling and of the capability of including guest molecules or ions in their micellar aggregates is an exciting research field for theoretical and technological reasons. In this light, assembling and chelating properties of sodium bis(2-ethylhexyl)sulfosuccinate (AOTNa) towards divalent metal ion chlorides have been investigated in the gas phase by electrospray ionization mass spectrometry in negative ion mode, tandem mass spectrometry and energy-resolved mass spectrometry. METHODS:Water/methanol solutions of AOTNa and chloride salts of nickel, magnesium, calcium and manganese, with different AOTNa/metal salt ratios, …
Gas Phase Charged Aggregates of Bis(2-ethylhexyl)sulfo-succinate (AOT) and Divalent Metal Ions. First evidence of AOT solvated aggregates
2011
Assembling and chelating properties of sodium bis(2-ethylhexyl)sulfosuccinate (AOTNa) towards divalent metal ions have been investigated in the gas phase by electrospray ionization mass spectrometry. A variety of positively charged monometallated and mixed metal aggregates are formed. Interestingly, several ions contain solvent (MeOH, H2O) molecules and constitute the most abundant AOT cationic aggregates not containing sodium. These species are the first example of solvated AOT-metal ion aggregates in the gas phase. By increasing the surfactant aggregation number, the abundance of solvated species becomes lower than that of unsolvated ones. Decompositions of ionic species have been studied…
Do electrospray mass spectra of surfactants mirror their aggregation state in solution?
2011
One important feature in the gas phase chemistry of surfactants is to ascertain whether their aggregates produced by electrospray ionization reflect those formed in the starting solution. With this aim, we have performed ESI-MS, ESI-MS/MS and ER-MS spectra of bis(2-ethylhexyl)sulfosuccinate (AOTNa) solutions in different solvents, i.e. water, water/methanol, methanol and n-hexane. The results clearly indicate that, notwithstanding the strongly different aggregation state in solution (direct micelles in water and in water/methanol, molecular dispersion in methanol and reverse micelles in n-hexane) and marked effects of the solvent polarity on the total ionic current, the surfactant aggregate…
Administración de Surfactante mediante técnica mínimamente invasiva en recién nacidos pretérmino: evaluación de la seguridad y la eficacia
2021
La terapia con surfactante forma parte de la práctica habitual en el manejo del distrés respiratorio en el recién nacido. Su administración ha sido tradicionalmente mediante intubación endotraqueal. Con el fin de minimizar el tiempo de intubación y ventilación mecánica se diseñó la estrategia INSURE (intubación, administración de surfactante y extubación), disminuyendo la posible exposición a la ventilación mecánica. En los últimos años se han investigado nuevas técnicas de administración de surfactante menos invasivas con el objetivo de minimizar los efectos de la intubación traqueal y evitar la aplicación de la ventilación mecánica. El método SONSURE consiste en la administración de surfa…
Demo 61. Tensión superficial. Ley de Tate
2013
Objetivo: Observar la diferencia de tensión superficial entre el agua y el alcohol. Comprobar el efecto de un surfactante como reductor de la tensión superficial.
Review: Mass spectrometry of surfactant aggregates
2011
In contrast with the enormous amount of literature produced during many decades in the field of surfactant aggregation in liquid, liquid crystalline and solid phases, only a few investigations concerning surfactant self-assembling in the gas phase as charged aggregates have been carried out until now. This lack of interest is disappointing in view of the remarkable theoretical and practical importance of the inherent knowledge. The absence of surfactant–solvent interactions makes it easier to study the role of surfactant–surfactant forces in determining their peculiar self-assembling features as well as the ability of these assemblies to incorporate selected solubilizate molecules. Thus, th…
A multifractal approach of central place theory for sustainable planning
2013
International audience
DEVELOPMENT OF SUSTAINABLE METROPOLITAN AREAS USING A MULTI-SCALE DECISION SUPPORT SYSTEM
2012
A sustainable and sustaining planning strategy is globally important for metropolitan areas. Sustainable planning addresses the development of strategies to reduce the use of resources, increase economic efficiency and improve integration of social aspects. In contrast, splinter development (e.g. urban sprawl) involves damage to nature and generation of an increasing volume of traffic (these are the main criticisms following a study by Newman and Kenworthy (1989) on the relationship between settlement density and energy consumption). Interestingly, the overly compact city also has this effect as it may generate traffic flows for accessing green and leisure areas, or changes of residence due…