Unión de péptidos a superficies de titanio para la mejora de la osteointegración

El presente estudio pretende mejorar el proceso de osteointegración del implante de titanio mediante la biofuncionalización de su superficie. Para ello se ha realizado una previa silanización de la superficie y una posterior unión covalente entre el silano y un péptido el cual posee la secuencia RGD. Se han estudiado diferentes aspectos como es la estabilidad tanto de conjunto titanio-silano como silano-péptido. Finalmente se ha realizado un ensayo de adhesión celular utilizando células osteoblásticas MG63 cuyas muestras de titanio han sido previamente biofuncionalizadas con el proceso estudiado.This study aims to improve the osseointegration process of the titanium implant through surface biofunctionalization. Samples were silanised on the surface and afterwards a peptide with the RGD sequence was covalently attached to the silane. Specific characteristics of the stability of the union titanium-silane as well as silane-peptide were studied. Finally cell adhesion studies to samples biofunctionalized with the technique studied in this work were made with MG63 osteoblastic cells.Peer Reviewe

Potencialidades do guandu como adubação verde em áreas cultivadas com cana-de-açúcar nos tabuleiros costeiros de Alagoas.

Grande parte da produção de cana-de-açúcar em Alagoas está concentrada nos tabuleiros costeiros, região litorânea com precipitação favorável ao desenvolvimento da cultura. Contudo, os solos de tabuleiros apresentam algumas limitações agrícolas referentes à baixa resistência mecânica a operações de preparo de solo, baixa fertilidade natural e de retenção de água e nutrientes. Os solos são caracterizados ainda por apresentarem uma alta coesão natural dos horizontes, o que dificulta a penetração e desenvolvimento radicular das plantas, a disponibilidade de água, a aeração e a absorção de nutrientes, podendo influenciar negativamente no desenvolvimento das culturas.bitstream/item/123063/1/Potencialidades-do-guandu.pd

Sheep Grazing Patterns for Better Land Management: Adjusting GPS Tracking Protocol

Small ruminant livestock systems in northeast Portugal are an extensive activity based on daily grazing paths across the landscape. The flocks use multiple patches of multiple land cover types in different ways throughout the year. Shepherd and flock interactions determine the resting and feeding spots utilized by sheep and goats according to the biotic and abiotic conditions. Information about the herding home range is central to managing the land use and vegetation cover and optimizing sheep and goats\u27 productivity in traditional systems. This study\u27s main objective is to contribute to calibrate a shepherding GPS protocol to monitor sheep flocks based on fieldwork in Vimieiro (Mirandela) on a protected area of the European Natura 2000 network. We answer two farmers\u27 and breeders\u27 requests for using GPS collars to monitor the landscape usage by sheep: (1) How closely do collared sheep remain within the flock? (2) How do the collars perform on different logging frequencies to estimate patch occupancy? We analyzed the grazing paths based on three collars\u27 5-minute GPS positions from winter to summer solstices. We investigated the differences in extent, duration, and frequency data of each collar throughout the season change based on spatial regressions. Results show no significant differences among the three collars ranges. It also indicates that positions collected every 15 and 30 minutes could be adequate. It means that a flock monitoring low cost can be generalized, providing accurate information to manage the pastoral territory and increase the small ruminant\u27s productivit

Mortalidad atribuible al alcohol en Cataluña y sus provincias

ObjetivoEstimar la contribución del consumo de alcohol en la mortalidad de Cataluña en 1997, su impacto sobre la mortalidad prematura y evaluar si existen diferencias entre provincias.DiseñoEstudio ecológico, descriptivo.EmplazamientoCataluña.PacientesDefunciones de residentes en Cataluña en 1997 por una causa relacionada con el consumo excesivo de alcohol.Mediciones y resultados principalesLos datos de las causas de muerte en Cataluña en 1997 fueron facilitados por el Registre de Mortalitat de Catalunya y se usaron las fracciones poblacionales atribuibles al alcohol recomendadas por los Centers for Disease Control de Estados Unidos en 1987. Se estimó la mortalidad atribuible al alcohol (MAA) y los años potenciales de vida perdidos (APVP) para el conjunto de Cataluña y desagregada por provincias.Un 4,8% de la mortalidad de Cataluña en 1997 estuvo relacionada con el consumo excesivo de alcohol. La mortalidad fue más elevada en varones (6,0%) que en mujeres (3,5%). Por grupos diagnósticos, las neoplasias malignas (29,9%) contribuyeron con un mayor número de MAA, mientras que los accidentes no intencionales presentaron la mayor mortalidad prematura (50,9%). Por causa específica, el mayor número de APVP correspondió a los accidentes de vehículos a motor. Por provincias, se observó mayor MAA por accidentes no intencionales en todas las provincias respecto a Barcelona y menor riesgo de muerte por enfermedades digestivas.ConclusiónEste estudio pone de manifiesto la importante implicación del alcohol en la mortalidad, así como su contribución en la mortalidad prematura y la existencia de importantes diferencias según la provincia de residencia, especialmente para accidentes no intencionales.ObjectivesTo calculate the contribution of alcohol consumption to mortality in Catalonia in 1997, and its impact on premature mortality. To evaluate whether inter-provincial differences exist.DesignDescriptive ecological study.SettingCatalonia.PatientsDeaths of residents of Catalonia in 1997 for a cause related to excess alcohol consumption.Measurements and main resultsThe data on the causes of death in Catalonia in 1997 were provided by the Catalonia Death Register. The population fractions attributable to alcohol used were those recommended by the United States Centers for Disease Control in 1987. Mortality attributable to alcohol and the potential years of life lost were calculated for Catalonia as a whole and province by province. 4.8% of mortality in Catalonia in 1997 was related to excessive alcohol consumption. Mortality was higher in men (6.0%) than in women (3.5%). By diagnostic groups, malignant neoplasms (29.9%) contributed to the greatest number of deaths attributable to alcohol, whereas non-intentional accidents was the greatest cause of premature death (50.9%). As a specific cause, the greatest number of potential years of life lost was due to motor vehicle accidents. The highest mortality rate due to alcohol in non-intentional accidents and the lowest risk of death from digestive diseases were in all the provinces rather than in Barcelona.ConclusionThis study highlighted the importance of alcohol in the mortality figures, its contribution to premature death and the existence of major differences depending on the province of residence, especially in non-intentional accidents

Leaf, Pod and Whole Plant Tannin Contents in Pigeon Pea (\u3cem\u3eCajanus cajan\u3c/em\u3e (L.) Millsp)

Tannin content is an important characteristic of leguminous crops and it has been used as a selection criterion in pigeon-pea improvement programmes (Godoy et al., 1994). In south-eastern Brazil, pigeon pea is often consumed by bovines in the dry season (from April though October), after flowering occurs, and is recommended in some cases, specifically for that time of the year (Lourenço et al., 1994). Since tannin content is being used as a selection criterion and the animals in the dry season preferentially eat pods and leaves, an experiment was conducted to compare whole plant, leaf and pod tannin content

Seasonal Variation of Tannin Content on Pigeon Pea (\u3cem\u3eCajanus Cajan\u3c/em\u3e (L.) Millsp) Plants

Tannins reduce forage digestibility and palatability by reacting with proteins (Makkar, 1989) and due to that, tannin content is considered to be an important characteristic of leguminous crops and it has been used as a selection criterion on pigeon-pea improvement programs (Godoy et al., 1994). In Southeastern Brazil, pigeon pea is less consumed by bovines in the rainy season (October through March) than in the dry season (from April on), when flowering occurs. Alencar et al. (1991) found very little consumption by Canchim cows during the rainy season, and Lourenço et al. (1984) recommend pigeon-pea for feeding bovines in the dry season

Recomendação de cultivares de aveia para a produção de grãos na região central do Estado de São Paulo, 2010.

A região central do Estado de São Paulo reúne ótimas condições climáticas para o cultivo da aveia. As temperaturas relativamente amenas do inverno e a falta de chuvas no período de amadurecimento dos grãos propiciam condições para que se obtenham altos rendimentos de grãos de ótima qualidade, desde que haja a possibilidade de suplementação do fornecimento de água durante o desenvolvimento da cultura. Anualmente, a Embrapa Pecuária Sudeste instala o ?Ensaio Brasileiro de Cultivares Recomendadas de Aveia?, como parte das atividades da Comissão Brasileira de Pesquisa de Aveia. Esse ensaio, instalado em rede em diversas instituições do Sul e do Sudeste do País, tem por finalidade observar a performance de todas as cultivares recomendadas para plantio de aveia e, com isso, verificar quais cultivares devem continuar a ser recomendadas.bitstream/item/42706/1/PROCIRG2010.00371.pd

Recomendações de cultivares de aveia para cobertura do solo, no estado de São Paulo para o ano de 2010.

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Recomendações de cultivares de aveia forrageira para o estado de São Paulo no ano de 2010.

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