238 research outputs found

    Avaliação da Actividade Muscular com e sem utilização de calçado instável e aplicação de um desequilíbrio

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    Objectivo: Este estudo visa avaliar a influência de sapatilhas MBT na actividade electromiográfica do tibial anterior, gastrocnémio, recto femoral e bicípite femoral, aplicando um desequilíbrio. Metodologia: A amostra foi constituída por 30 indivíduos do sexo feminino, com idades entre os 21 e os 57 anos. Os dados foram recolhidos através de electromiografia, tendo sido utilizada a plataforma de forças e dinamómetro para monitorizar o desequilíbrio. Resultados: Não foram encontradas diferenças estatisticamente significativas no tempo de início de activação muscular com calçado MBT e descalço. Conclusão: O uso de MBT, comparando com descalço, não influenciou os tempos de início de activação muscular.Objective: The main purpose of this project were to study the infl uence of MBT in electromyographi c activity of, Tibialis Anterior, Gastrocnemius, Rectus femoris and Biceps femoris during an external pertubation . Metodology : 30 subjects (female) with ages between 21 and 57 years old participate in this study. EMG activities were recorded during an exte rnal perturbation by surface electromyography, and monitorized using a platform and a dynamometer to measure the force . Results: Results showed no statistically significative differences in the initial time muscular activation, comparing the use of MBT and with bare feet Conclusion: The use of MBT doesn’t influenciate the initial time of muscular activation

    Desenvolvimento de metodologia analítica para análise de carrapaticidas em carne bovina.

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    A metodologia proposta mostrou-se apropriada para analisar traços de clorfenvinfos, fipronil e cipermetrina em carne bovina, a qual dispensa o uso de solventes orgânicos, além de ser rápida, sensível e seletiva

    Evaluación del vault en la adaptación de lentes de contacto esclerales con un biómetro óptico

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    [Extracto] Justificación y objetivos -   La tomografía de coherencia óptica (OCT) anterior es un método óptico que permite evaluar la separación entre la lente de contacto y la córnea – vault – en la adaptación de lentes de contacto esclerales (LCE). Sin embargo, el costo considerable de este tipo de equipo es un obstáculo a la aplicación en usuarios de LCE, especialmente en el ámbito de investigación. [...]info:eu-repo/semantics/publishedVersio

    Impact of contact lens materials on the mfERG response of the human retina

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    Purpose To investigate the effect of different hydrophilic and rigid gas-permeable contact lens (CL) materials on multifocal electroretinography (mfERG). Methods The mfERG was recorded in 18 healthy subjects with RETI-port/scan21 (TM): 11 subjects underwent mfERG recording wearing two different hydrophilic CLs with different water contents in a randomized order (1 silicone hydrogel-Comfilcon A, 48%EWC, and 1 hydrogel-Omafilcon A, 62% EWC) and 7 other subjects wore a hydrophobic rigid gas-permeable scleral lens (SL)-Hexafocon A. Control measures were recorded without CL in both groups. mfERG recordings were performed with a stimulus array pattern of 103-scaled hexagons displayed on a 19-inch RGB monitor at 28 cm distance at a frame rate of 60 Hz. The amplitude (nV), implicit time and response density (nV/deg(2)) of the first-order kernel components N1, P1 and N2 were evaluated for the total mfERG response and for the response averages of 4 quadrants and of 6 successive concentric rings. Subjects were optically corrected for the working distance of ERG display. Results Hydrophobic material significantly decreased the P1 amplitude of the total mfERG response, at Rings 3, 4 and 6 and Quadrant 4 (> 53.77 +/- 43.2 nV; P <= 0.050), as well as the total (- 71.59 +/- 50.68 nV) and Ring 6 (- 104.76 +/- 79.88 nV) N2 amplitude (P <= 0.043). N1, P1 and N2 peak times suffered significant changes with both hydrophilic CL (P <= 0.050). Omafilcon A significantly increased P1 amplitude of Ring 5 and N2 amplitude of Ring 4, when compared to baseline (52.40 +/- 71.87 nV; P = 0.036) and to Comfilcon A (39.51 +/- 48.63 nV; P = 0.023), respectively. Conclusions Hydrophobic CL slightly attenuated the strength of the mfERG signal, especially at the middle to peripheral retinal areas, while hydrophilic CL slightly changed the implicit time of the response. Different hydrophilic CL materials might affect the mfERG response differently. When considering the measurement of mfERG obtained with a CL in place, researchers should bear in mind thThis project was supported by the Portuguese Foundation for Science and Technology (FCT) in the framework of projects PTDC/FIS-OPT/0677/2014 and the FCT Strategic Funding UID/FIS/04650/2013, FCT- SFRH/BPD/92365/2013 and SFRH/BD/136684/2018

    Comunicação na gestão de cooperativas.

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    Este artigo analisou a comunicação no modelo federado de cooperativas de leite em Minas Gerais. A partir de entrevistas semiestruturadas com os dirigentes destas organizações, evidenciou-se a necessidade de redimensionar a comunicação para uma perspectiva mais democrática, levando em consideração o papel de cada cooperativa no modelo de integração vertical produtiva, para torná-lo mais coeso

    Extraction and characterization of lignins from cashew apple bagasse obtained by different treatments

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    Lignins were extracted from different hydrolysates from the cashew apple bagasse (CAB). The hydrolysates, in turn, were obtained by pretreating the CAB with diluted acid (DA), acid/alkali (AA) and alkaline hydrogen peroxide (AHP). Lignin removal levels with AA and AHP were of 98.0% and 96.9%, resulting in high extraction yields and highly thermostable lignins. The lowest lignin yield was observed with the acid-only pretreatment. The FT-IR results showed that there was no significant difference between the main structures of the lignin isolated from the DA and AHP pretreatments, when compared to sugarcane lignin (SCL), the only exception being the lignin from AA. An 1H–13C HSQC NMR analysis demonstrated that AA pretreatment reduced the syringyl (S) and hydroxyphenyl (H) units, but increased the condensed guaiacyl (G) units, which may contribute to the higher thermal stability of the isolated lignins and to the absence of attached residues of carbohydrates. The detailed structural properties of the lignins extracted from CAB will enable the efficient utilization of these macromolecules within the biorefinery concept, with a positive impact on the economy

    Entre o social e o econômico, uma gestão cooperativa é possível? Estudo sobre as estratégias de comunicação nas cooperativas agropecuárias.

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    Este artigo tem como objetivo analisar as estratégias de comunicação nas cooperativas agropecuárias, localizadas no estado de Minas Gerais, no contexto do modelo federado de cooperativas. A pesquisa é qualitativa que contou com o apoio da técnica de entrevista semiestruturada. Entre os resultados, postula-se que exista nesta articulação diferentes processos de comunicação simultâneos e relacionados que precisam harmonizar interesses, demandas e exigências desses três níveis de instâncias, numa adequada escolha de canais e de mensagens

    Uma análise da gestão social em cooperativas agropecuárias sob a perspectiva da organização do quadro social.

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    A Organização do Quadro Social é uma ferramenta estratégica da gestão social de cooperativas, que consiste num processo sistemático de comunicação e integração entre cooperados e conselho administrativo, operacionalizado através de um comitê educativo. Assim, este artigo objetiva entender o funcionamento do processo de comunicação entre cooperativas agropecuárias e produtores rurais, viabilizado pela gestão social através do processo de Organização do Quadro Social. A pesquisa realizada teve caráter exploratório descritivo e utilizou-se de um estudo de caso numa cooperativa agropecuária de Minas Gerais. Entrevistas, aplicação de questionários, dados secundários e observação participante foram as técnicas de coletas de dados utilizadas para se chegar aos resultados, os quais indicam que o trabalho de OQS potencializa as atividades agroindustriais se bem articuladas entre as organizações do mesmo sistema, mas ao mesmo tempo revela que falta um planejamento das atividades de educação cooperativista. Conclui que essa ferramenta promove um maior envolvimento entre os membros da cooperativa, elimina o distanciamento entre cooperativas e associados, promove a socialização dos cooperados, a melhoria dos serviços de assistência técnica, da produção e da produtividade

    Sugarcane giant borer transcriptome analysis and identification of genes related to digestion.

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    Sugarcane is a widely cultivated plant that serves primarily as a source of sugar and ethanol. Its annual yield can be significantly reduced by the action of several insect pests including the sugarcane giant borer (Telchin licus licus), a lepidopteran that presents a long life cycle and which efforts to control it using pesticides have been inefficient. Although its economical relevance, only a few DNA sequences are available for this species in the Gen-Bank. Pyrosequencing technology was used to investigate the transcriptome of several developmental stages of the insect. To maximize transcript diversity, a pool of total RNA was extracted from whole body insects and used to construct a normalized cDNA database. Sequencing produced over 650,000 reads, which were de novo assembled to generate a reference library of 23,824 contigs. After quality score and annotation, 43% of the contigs had at least one BLAST hit against the NCBI non-redundant database, and 40% showed similarities with the lepidopteran Bombyx mori. In a further analysis, we conducted a comparison with Manduca sexta midgut sequences to identify transcripts of genes involved in digestion. Of these transcripts, many presented an expansion or depletion in gene number, compared to B. mori genome. From the sugarcane giant borer (SGB) transcriptome, a of aminopeptidase N (APN) cDNAs were characterized based on homology to those reported as Cry toxin receptors. This is the first report that provides a large-scale EST database for the species. Transcriptome analysis will certainly be useful to identify novel developmental genes, to better understand the insect?s biology and to guide the development of new strategies for insect-pest control
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