695 research outputs found

    Melhoramento e manejo de pastagens na Ilha de Marajó: resultados e informações práticas.

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    Nutrientes limitantes ao estabelecimento e produção de Brachiaria humidicola consorciada com leguminosas em tesos da Ilha de Marajó.

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    Uma pastagem de Brachiaria humidicola consorciada com leguminosas foi estabelecida em uma área de "tesos" da fazenda Curral do Meio, localizada no município de Ponta de Pedras na ilha de Marajó (PA), objetivando avaliar o efeito da omissão de nutrientes sobre o estabelecimento e rendimento das plantas. O solo e um Plintossolo ácido e de baixa fertilidade natural. O clima, segundo Koppen, e Amitropical chuvoso, com precipitação pluviométrica anual media de 2.500 mm, temperatura media de 27C e umidade relativa em torno dos 85%. Utilizou-se o delineamento experimental inteiramente ao acaso com dez tratamentos e três repetições. Periodicamente, eram realizados cortes com vistas a determinação da produção de matéria seca. Os resultados obtidos indicam baixo potencial de resposta das espécies em consorcio aos nutrientes. O potássio foi o nutriente mais limitante a persistência das leguminosas no consorcio.bitstream/item/32031/1/CPATU-BP118.pd

    Indústria frigorífica no Brasil: uma análise exploratória da concentração espacial.

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    O presente estudo faz uma análise da distribuição espacial da indústria frigorífica e dos rebanhos bovinos no Brasil para os anos de 2006, 2010 e 2014. Para isso, foram utilizadas técnicas de análise exploratória de dados espaciais ? AEDE, realizando-se assim, análise univariada para o número de empregos na indústria frigorífica existente nos municípios brasileiro, e também, a mesma análise para os efetivos de rebanho bovino dos municípios do Brasil. Os resultados revelam que existe dependência espacial, assim, observa-se tanto nos mapas de clusters quanto no mapa de dispersão, padrões de alta concentração dessas atividades, principalmente na região Centro-Oeste do Brasil. Conclui-se que existem evidências de que a localização dos rebanhos bovinos pode exercer influência sobre a instalação de frigoríficos no Brasil, sugerindo-se estudos futuros que testem essa hipótese

    Automatic 3D pulmonary nodule detection in CT images: a survey

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    This work presents a systematic review of techniques for the 3D automatic detection of pulmonary nodules in computerized-tomography (CT) images. Its main goals are to analyze the latest technology being used for the development of computational diagnostic tools to assist in the acquisition, storage and, mainly, processing and analysis of the biomedical data. Also, this work identifies the progress made, so far, evaluates the challenges to be overcome and provides an analysis of future prospects. As far as the authors know, this is the first time that a review is devoted exclusively to automated 3D techniques for the detection of pulmonary nodules from lung CT images, which makes this work of noteworthy value. The research covered the published works in the Web of Science, PubMed, Science Direct and IEEEXplore up to December 2014. Each work found that referred to automated 3D segmentation of the lungs was individually analyzed to identify its objective, methodology and results. Based on the analysis of the selected works, several studies were seen to be useful for the construction of medical diagnostic aid tools. However, there are certain aspects that still require attention such as increasing algorithm sensitivity, reducing the number of false positives, improving and optimizing the algorithm detection of different kinds of nodules with different sizes and shapes and, finally, the ability to integrate with the Electronic Medical Record Systems and Picture Archiving and Communication Systems. Based on this analysis, we can say that further research is needed to develop current techniques and that new algorithms are needed to overcome the identified drawbacks

    Progresso genético para produtividade e peso de 100 grãos em 14 anos do Programa de Melhoramento de Arroz Irrigado de Minas Gerais.

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    O objetivo deste estudo foi estimar o progresso genético e ambiental da produtividade e peso de 100 grãos do programa de melhoramento de arroz irrigado do estado de Minas Gerais no período de 1998 a 2012

    COPD: can genetic Background inform about disease heterogeneity?

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    People with COPD vary substantially on their pulmonary (e.g., airway obstruction) and extra-pulmonary (e.g., symptoms, functional status) manifestations. The aim of this study was to relate this high heterogeneity to the patient’s genetic Background, namely focusing on polymorphisms associated with COPD and COPD-associated phenotypes and features. Summary statistics for COPD and COPD-associated phenotypes and features (emphysema, FEV1, FEV1/FVC, smoking, BMI, asthma, airway responsiveness, coronary heart disease, blood pressure, pulmonary artery enlargement, resting heart rate and resting oxygen saturation) were obtained from GWAS Catalog (https://www.ebi.ac.uk/gwas/ accessed in August 2021). A local COPD cohort was genotyped using Global Screening Arrays (GSA-Illumina) and polygenic risk scores were calculated per phenotype/feature. A cluster analysis was then carried out to determine how patients would group according to their assessed genetic risks. The study currently includes 255 participants with COPD (68 [61, 74] years old; 79.61% male; FEV1/FVC 53.02 [41.24, 61.94]). Our preliminary results show that people cluster into 3 main groups based on their genetic risk for emphysema, followed by COPD, whilst their clinical characteristics remained similar among groups. Future work is currently being conducted to further explore these clusters and perform their validation. This work was funded by FEDER funds through COMPETE 2020, Operational Programme for Competitiveness and Internationalization (POCI-01-0145-FEDER-028806), CENTRO 2020 (CENTRO-01-0246-FEDER-000018; CENTRO-08-5864-FSE-000039) and by Fundação para a Ciência e a Tecnologia (UI/BD/151337/2021). The iBiMED is supported by FCT funds under UIDP/04501/2020.publishe
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