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Sampaio R.F.,Federal University of Minas Gerais | Augusto V.G.,University Estadual Of Minas Gerais Uemg
Brazilian Journal of Physical Therapy | Year: 2012

Background: The rapid aging of the workforce has motivated the development of studies that seek to maintain good health conditions, work ability, autonomy and the social integration of workers. Objectives: To present the theoretical framework, available measurements and models for promoting work ability. Discussion: In the field of rehabilitation, the sedimentation of the conceptual model of the ability to work has a normative role and may be useful for assessing whether a person has a temporary or permanent loss of capacity as well as for defining a specific rehabilitation program. The concept may further help determine different aspects, both internal and external to the person, that could result in improved or restored work ability. Conclusion: In order to enhance the available measurements, propose new interventions for promoting work ability and to further its use as an outcome measure in rehabilitation, it is necessary to assume that the predictors relate to the individuals, their work and their life outside of work in dynamic interactions that require analytical methods which account for the multidimensionality of the construct. Source

Silva P.J.,Centro Universitario Of Formiga Unifor Mg | Silva P.J.,University Estadual Of Minas Gerais Uemg | De Brito M.J.,Federal University of Lavras | De Sousa A.R.,Centro Universitario Of Lavras Unilavras | Da Gloria Pereira Brito V.,Federal University of Lavras
Gestao e Producao | Year: 2015

This article discusses the results of a research that aimed to investigate the explanatory constructs of social capital present in an organizational network composed of companies from the electrical and electronics sector in the municipality of Santa Rita do Sapucaí, Minas Gerais state, Brazil. We started from the assumption that the capital present in the network consisted of three analytic dimensions, that is, the constructs of structural and relational nature, and those that portray the benefits and restrictions of this type of social capital. To validate this explanatory model and test the hypotheses surrounding it, we utilized the method of descriptive research anchored by Partial Least Squares Path Modeling (PSL-PM). Analysis of the results obtained from the application of structural equation modeling showed that the proposed explanatory model presents structural and nomological validity. Source

Rodrigues de Souza J.A.,Instituto Federal Goiano IFGoiano | Moreira D.A.,Instituto Federal Goiano IFGoiano | Moreira Conde N.,University Estadual Of Minas Gerais Uemg | Belchior de Carvalho W.,Instituto Federal Goiano IFGoiano | Miranda e Carvalho C.V.,Instituto Federal Goiano IFGoiano
Revista Ambiente e Agua | Year: 2015

In this work we investigated the interference of anthropic activities on the potability of groundwater in the urban area of the city of Ubá, MG. To accomplish this, the physical characteristics (temperature, turbidity and color), chemical (pH, conductivity, chloride, nitrate and hardness) and microbiological (total and thermotolerant coliforms) of ten upwelling waters were monitored throughout one year. The temperature, pH, color, chloride and hardness of all upwelling waters were considered normal compared to standards of potable water. However, the analyses of turbidity, electrical conductivity, nitrate and total and thermotolerant coliforms indicate contamination by human activities. Overall, the results indicated the occurrence of high environmental degradation, where only 30% of monitored upwelling waters were in accordance with the quality standard, indicating the need for intervention to ensure water quality. © Rev. Ambient Source

Alexandrino J.S.,University Estadual Of Minas Gerais Uemg | Peres A.E.C.,Federal University of Minas Gerais | Lopes G.M.,Vale Mina de Brucutu | Rodrigues O.M.S.,Federal University of Ouro Preto
Revista Escola de Minas | Year: 2016

The dispersion degree of the mineral particles in the pulp is especially relevant regarding the performance of the cationic reverse flotation of iron ores. The gangue minerals should remain dispersed while hematite particles should be selectively flocculated. The present study addressed determinations of dispersion degree and zeta potential of hematite in the presence of different dispersants, classified as organic polymeric (natural and synthetic), organic monomeric, and inorganic. Special attention was paid to results achieved at pH 10, used in plant practice. For natural organic polymers, correlation was observed between the dispersion degree and the increase in the negative value of zeta potential. Some synthetic organic polymers enhance the dispersion of hematite particles despite not affecting significantly the zeta potential. Sodium silicates, irrespectively of the SiO2/Na2O ratio, at pH 10, did not impact significantly either the dispersion degree or the zeta potential. © 2016, Escola de Minas. All rights reserved. Source

Villanova J.C.O.,Federal University of Minas Gerais | Ayres E.,University Estadual Of Minas Gerais Uemg | Orefice R.L.,Federal University of Minas Gerais
European Journal of Pharmaceutics and Biopharmaceutics | Year: 2011

The design of new excipients that extend the release of drugs from tablets over prolonged periods is essential in reaching enhanced therapeutic performances. In this sense, the objective of this study was to develop new excipients, based on acrylic monomers (ethyl acrylate, methyl methacrylate, and butyl methacrylate) for use in direct compression (DC). The polymeric excipients were prepared by suspension and emulsion polymerization reactions and were characterized by FTIR to confirm the polymerization reaction. For the success of direct compression, excipients must present good flow and compactability properties. Therefore, excipients were submitted to analysis of morphology (SEM), particle size and size distribution by laser diffraction, and powder density (bulk density and tapped density). The Carr index, Hausner ratio, flow ratio, and cotangent of the angle α were determined. Thereafter, the polymeric excipients were used to prepare inert matrices by DC using propranolol hydrochloride (PHCl) as a model drug. The tablets were evaluated for average weight, breaking force, and friability tests. The release profiles were determined, and the dissolution kinetics was studied. The results indicated that matrices prepared from excipients obtained by suspension polymerization (NWCB and PECB) presented a release of PHCl for a period exceeding 12 h, most likely due to the higher micromeritic properties. The results suggested that the increase in the percentage of polymers, as well as in the compression time, resulted in a higher hardness of the matrix with a reduced rate release of the PHCl. Finally, in vitro preliminary tests showed that the polymeric excipients produced were non-toxic for the gingival fibroblasts. © 2011 Elsevier B.V. All rights reserved. Source

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