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Preparação de membranas de acetato de celulose organomodificadas para adsorção ...

Cellulose acetate polymeric membranes had been prepared by a procedure of two steps, combining the method of phase inversion and the technique of hydrolysis-deposition. The first step was the preparation of the membrane, and together was organomodified with tetraethylortosilicate and 3-aminopropyltrietoxysilane. Parameters that exert influence in the complexation of the metallic ion, as pH, time of complexation...

Nanopartículas de alginato como sistema de liberação para o herbicida clomazone

In this paper, we describe the preparation of alginate nanoparticles as a delivery system for the herbicide clomazone. Two different methods were investigated and characterized by size distribution, zeta potencial, pH and in vitro release. The alginate/AOT nanoparticles had higher rates of association of the herbicide clomazone than alginate/chitosan nanoparticles. Clomazone release profile, showed a significan...

Desenvolvimento e caracterização de nanocápsulas de poli (L-lactídeo) contendo ...

In this paper we describe the preparation poly (L-lactide) (PLA) nanocapsules as a drug delivery system for the local anesthetic benzocaine. The characterization and in vitro release properties of the system were investigated. The characterization results showed a polydispersity index of 0.14, an average diameter of 190.1± 3 nm, zeta potential of -38.5 mV and an entrapment efficiency of 73%. The release profile...

Determination and validation of nimesulide in pharmaceutical formulation by nea...

The determination of nimesulide in pharmaceutical formulation in the range of 10.38 to 39.47% m/m using near infrared spectroscopy and multivariate calibration based on partial least squares (PLS) and net analyte signal (NAS) was studied and validated by establishing its figures of merit. Suitable results were obtained, with limit of detection of 0.61%, limit quantification of 2.03%, accuracy estimated as root ...

Physicochemical stability of poly(lactide-co-glycolide) nanocapsules containing...

This paper describes the preparation of poly(DL-lactide-co-glicolide) (PLGA) nanocapsules as a drug carrier system for the local anesthetic bupivacaine. The system was characterized and its stability investigated. The results showed a size distribution with a polydispersity index of 0.12, an average diameter of 148 nm, a zeta potential of -43.5 mV and an entrapment efficiency of 75.8%. The physicochemical prope...

Estudo exploratório acerca das concepções de formadores de psicólogos de Goiâni...

Dissertação (mestrado)—Universidade de Brasília, Instituto de Psicologia, Programa de Pós-Graduação Processos de Desenvolvimento Humano e Saúde, 2009. ; A Psicologia Escolar vem se afirmando como um campo de atuação, pesquisa e produção de conhecimentos que tem expandido sua atuação a contextos educativos diversificados. Um dos cenários que se configura a essa ampliação é a Educação Superior. Esta pesquisa t...

Immunohistochemical evaluation for P53 and VEGF (Vascular Endothelial Growth Fa...

OBJECTIVES: To correlate the expression of p53 protein and VEGF with the prognosis of patients submitted to curative resection to treat esophageal adenocarcinoma. METHODS: Forty-six patients with esophageal adenocarcinoma, submitted to curative resection, were studied. The expressions of p53 protein and VEGF were assessed by immunohistochemistry in 52.2% and 47.8% of tumors, respectively. RESULTS: P53 protein a...

Thermal decomposition kinetics of humic substances extracted from mid-Rio Negro...

In this work humic substances (HS) extracted from non-flooded (Araçá) and flooded (Iara) soils were characterized through the calculation of stability and activation energies associated with the dehydration and thermal decomposition of HS using TGA and DTA, electronic paramagnetic resonance and C/H, C/N and C/O atomic ratios. For HS extracted from flooded soils, there was evidence for the influence of humidity ...

Perfil nutricional de pacientes com câncer de esôfago e estômago que internam n...

MediaAccess - componentes para acesso a informação multimédia na web

Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Engenharia Informática ; A Internet tem-se vindo a afirmar cada vez mais como um suporte para a partilha de conteúdos multimédia, havendo actualmente grande destaque para o vídeo. Quem tira grande partido destas características são os seus utilizadores, agrupando-se em redes sociais o...