Trata-se de um relato de experiência relativo às estratégias e ações adotadas para a integração ensino-serviço, com a finalidade de contribuir no processo de formação profissional na área da saúde, em consonância com as diretrizes e princípios do Sistema Único de Saúde (SUS). O trabalho aborda as descobertas, os avanços, as potencialidades, as dificuldades e os pontos críticos encontrados, assim como as experiências bem-sucedidas e a sustentabilidade vivenciada no contexto da Atenção Primária à Saúde com os programas Pró-Saúde e PET-Saúde.
Biomaterials come from natural sources such as animals, plants, fungi, algae, and bacteria, composed mainly of protein, lipid, and carbohydrate molecules. The great diversity of biomaterials makes these compounds promising for developing new products for technological applications. In this sense, antioxidant biomaterials have been developed to exert biological and active functions in the human body and industrial formulations. Furthermore, antioxidant biomaterials come from natural sources, whose components can inhibit reactive oxygen species (ROS). Thus, these materials incorporated with antioxidants, mainly from plant sources, have important effects, such as anti-inflammatory, wound healing, antitumor, and anti-aging, in addition to increasing the shelf-life of products. Aiming at the importance of antioxidant biomaterials in different technological segments as biodegradable, economic, and promising sources, this review presents the main available biomaterials, antioxidant sources, and assigned biological activities. In addition, potential applications in the biomedical and industrial fields are described with a focus on innovative publications found in the literature in the last five years.
High-density polyethylene (HDPE) reinforced with cellulose from rice husk (RH) were prepared and studied. The RH biomass was submitted to acid extraction and bleaching process and then analyzed for its cellulose extraction efficiency by X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR). After that, the RH cellulose (RHC) was incorpored to the HDPE matrix by melt blending with different filler contents (5, 10 and 15 wt%), and then characterized in terms of mechanical properties and morphology. The RHC incorporation in the HDPE matrix resulted in an increase in elastic modulus regardless the filler content added; also, the impact resistance was maintained for RHC contents up to 10%. The morphological analysis of the composites showed that the cellulose was well dispersed in the matrix, which contributed to the improvement of the final rigidity of these materials, indicating the feasibility of incorporating this residue in the production of HDPE composites.
RESUMO O presente trabalho teve como objetivo empregar resíduos agroindustriais, especificamente fibras celulósicas extraídas de talos de casca de banana, para a obtenção de acetato de celulose. Tal produto por sua vez, foi utilizado como matriz em um compósito antimicrobiano para uso em embalagens de alimentos, constituído de acetato de celulose e partículas de prata. As referidas partículas foram produzidas por meio de síntese hidrotérmica assistida por micro-ondas a partir da redução do nitrato de prata, utilizando o citrato trisódico. As partículas de prata apresentaram um diâmetro médio de 433,6 nm. O compósito obtido foi caracterizado por microscopia eletrônica de varredura (MEV), testes de resistência à tração, análise termogravimétrica e espectroscopia no infravermelho por transformada de Fourrier (FTIR) e no UV-visível. Os resultados mostraram uma tensão de ruptura de aproximadamente 43 MPa, 25% maior que a apresentada por polímeros comerciais sem a adição de cargas. Além disto, obteve-se propriedades bactericidas com relação as bactérias Staphylococcus aureus e Escherichia coli, quando em contato direto com o filme formado pelo compósito.
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