Matérias alternativas: potencialidades e equívocos – basebol e canoagem

Verifica-se cada vez mais a procura de novas modalidades a lecionar na escola, numa tentativa de fugir às modalidades usuais, procurando promover, desta forma, uma maior motivação dos alunos para a prática de atividade física. Os temas delineados foram expostos pelos núcleos de estágio e contaram maioritariamente com preletores convidados com o intuito de enriquecer os seus temas do ponto de vista da experiência pessoal que cada preletor transmitisse na sua comunicação. O basebol e a canoagem apresentam-se como matérias alternativas, no programa de Educação Física escolar, e foram apresentadas com intuito de auxiliar os professores que queiram lecionar matérias alternativas de forma atrativa e aliciante para os alunos. Cada matéria expressa no Programa Nacional de Educação Física (PNEF) representa uma mais-valia no processo de ensino-aprendizagem dos alunos, uma vez que a sua diversificação permite a cada um diversificar as suas competências. Desta forma, as matérias devem ser vistas como um meio para atingir os objetivos propostos e não como um fim.info:eu-repo/semantics/publishedVersio

Avaliação da condição física

A avaliação da condição física (CF) possui caráter complexo e subjetivo, não obstante os propósitos de motivação dos jovens para a atividade física e aptidão física. A CF no PNEF possui um programa comum para cada ciclo de escolaridade, tendo como finalidade a elevação das capacidades condicionais e coordenativas, privilegiando a zona de aptidão “saudável” para os jovens. Embora a avaliação da CF seja associada à promoção da saúde e atividade física, os autores alertam para a fraca fiabilidade dos resultados e os constrangimentos nos alunos. Dados recolhidos de docentes de 6 escolas, de 2º e 3º ciclos e Ensino Secundário do Funchal, permitiram aferir que, para a maioria, a carga letiva de Educação Física não é suficiente para um trabalho harmonioso da CF, devendo esta ser avaliada como matéria de ensino. A avaliação da aptidão física continuará a constituir um veículo promotor da atividade física, saúde e bem-estar. Urge questionar o modelo de avaliação isolado da CF, porém é necessário encontrar modelos operacionalizáveis, no sentido de atuar de forma mais eficaz na promoção da aptidão e atividade física dos jovens, sendo a Educação Física um meio privilegiado para o efeito.info:eu-repo/semantics/publishedVersio

Problemáticas da educação física II

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Problemáticas da educação física I

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O4 - Exploring the biological properties and regenerative potential of biomaterials using cell culture models

Life expectancy has improved signifcantly and, along with the declining birthrate, has contributed to the aging of populations, especially in industrialized countries. Alas, aging is intrinsically associated with the incidence of health problems including bone and tooth loss that require suitable solutions to support the quality of life. To meet these demands, signifcant research eforts have been undertaken to develop novel biomaterials, both orthopedic and dental implants. The feld of biomaterials for bone tissue engineering is increasingly evolving. The most recent generations of biomaterials have increasingly more activity and interaction with the biological environment and stimulate the regeneration of functional tissue. Natural polymers and compounds have been combined with each other to improve workability and are strategically integrated with ceramics or bioactive glasses to reinforce the structure of the fnal system, thus producing composites with a better mechanical performance. Our research group has been focused on the biological characterization of diferent added-value materials and composites, namely by evaluating their antimicrobial, biocompatibility, and regenerative properties. Some of our recent work results allowed us to conclude that marine fungal extracts, as well as sol–gel-derived bioactive glass nanoparticles, have inhibitory efects on the growth of C. albicans and E. faecalis (main pathogens in persistent root canal infections). Additionally, we have characterized cuttlefsh bone powders for endodontic applications. We are also committed to developing strategies for monitoring cell response to these biomaterials at the molecular level that could be used to follow infammation and osteoconduction.info:eu-repo/semantics/publishedVersio

Recent progress on gellan gum hydrogels provided by functionalization strategies

Gellan gum, a microbial exopolysaccharide fermentation product of Pseudomonas elodea, is a natural biomaterial that has shown promise for tissue engineering and regenerative medicine applications. Although this exopolysaccharide possesses many advantages, such interesting physicochemical properties and non-cytotoxicity, the mechanical properties and processability of gellan gum are not totally satisfactory in different tissue engineering contexts, i.e. gellan gum hydrogels are mechanically weak and the high gelling temperature is also unfavourable. An additional critical limitation is the lack of specific attachment sites for anchorage-dependent cells. However, the multiple hydroxyl groups and the free carboxyl per repeating unit of gellan gum can be used for chemical modification and functionalization in order to optimize its physicochemical and biological properties. A number of physical modification approaches have also been employed. This review outlines the recent progresses for gellan gum hydrogels and derivatives, and identifies the new challenges in tissue engineering, provided by blending and/or chemical modifications.Portuguese Foundation for Science and Technology (FCT) through the project EPIDisc (UTAP-EXPL/BBBECT/0050/2014), funded in the Framework of the ‘‘International Collaboratory for Emerging Technologies, CoLab’’, UT Austin Portugal Program.FCT for the fellowship grant SFRH/BPD/100590/2014FCT program (IF/00423/2012

Subcritical carbon dioxide foaming of polycaprolactone for bone tissue regeneration

Accepted manuscriptThe preparation of three-dimensional polycaprolactone scaffolds using dense CO2 as foaming agent, without supercritical conditions, was evaluated in this study towards future applications in bone repair. Herein, 3D foams were obtained at 5.0 MPa and 45 °C. To induce bioactivity, β-tricalcium phosphate (β-TCP, 10 wt%) and dexamethasone (5 and 10 wt%) were dispersed in the scaffolds. Foams revealed a pore size range of 164–882 μm, 73–99% porosity and 79–99% interconnectivity, assessed by micro-computed tomography, and a Young modulus of 1.76–2.92 MPa. Dexamethasone did not impair morphology of the matrices in comparison with PCL+β-TCP, which presented a water uptake of nearly 100% after 14 days. A sustained release of dexamethasone was achieved over 35 days in physiologic solution. This study reports the feasibility of using dense CO2 to produce in one-step a porous matrix loaded with active agents opening new possibilities towards injectable systems for in situ foamingEuropean Union Seventh Framework Programme (FP7/2007-2013) under grant agreement number REGPOT-CT2012-316331-POLARIS. It was also funded by the project “Novel smart and biomimetic materials for innovative regenerative medicine approaches” (RL1-ABMR-NORTE-01-0124-FEDER-000016) co-financed by North Portugal Regional Operational Programme (ON.2 – O Novo Norte), under the National Strategic Reference Framework (NSRF), through the European Regional Development Fund (ERDF) and the project NORTE‐01‐0145‐FEDER‐000013, supported by the Northern Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement. The authors would like to acknowledge the funding of the project Associate Laboratory ICVS/3B’s, under grant agreement number POCI-01-0145-FEDER-007038 supported by FEDER, through the Competitiveness Factors Operational Programme (COMPETE), and by National funds, through the Foundation for Science and Technology (FCT)info:eu-repo/semantics/publishedVersio

In situ synthesis of magnetite nanoparticles in carrageenan gels

Magnetite nanoparticles have been successfully synthesized in the presence of carrageenan polysaccharides using an in situ coprecipitation method. Iron coordination to the sulfate groups of the polysaccharide was confirmed by FTIR. The polysaccharide type ( , é, or ì) and concentration have been varied and their effects on particle morphology and chemical stability of the resultant nanocomposite investigated. The presence of carrageenan induces the formation of smaller particles, compared to those formed in the absence of polymer, and their average size depends on the nature and concentration of the polysaccharide used. The chemical stability of magnetite nanoparticles toward oxidation was also seen to depend on biopolymer type with magnetite formed in é-carrageenan showing the highest chemical stability. A general tendency toward lower stability is observed as the polysaccharide concentration is increased. It is suggested that magnetite chemical stability in the carrageenan composites is determined by a fine balance between particle size and gel strength, the latter determining oxygen diffusion rates through the medium

Allergic Contact Cheilitis to Food Additives

Os aditivos alimentares, em que se incluem os sulfitos e os galatos, modificam intencionalmente as propriedades dos alimentos. A utilização dos sulfitos na indústria alimentar deve-se à sua acção antibacteriana, prevenção da oxidação e inibição do escurecimento enzimático e não-enzimático durante os processos de preparação, distribuição e armazenamento dos alimentos. Os galatos são utilizados tanto na indústria alimentar como em cosméticos. Descrevemos o caso de uma doente de 36 anos com um quadro de queilite de contacto alérgica atribuída ao metabissulfito de sódio (E223) de uma salada de fruta comercializada possivelmente perpetuada por alergia de contacto a galatos presentes nos batons utilizados.Food additives are used intentionally to modify food properties. Sulfites are used in food industry due to its antibacterial action, prevention of oxidation and inhibition of enzymatic and nonenzymatic browning discoloration of food during the process of preparation, distribution and storage. Gallates are used as antioxidants both in food and cosmetics. We report the case of a 36 years-old patient with allergic contact cheilitis to sodium metabisulfite (E223) found in a fruit salad, possibly perpetuated by the antioxidants in her lipsticks