Salinity in soil can affect Jatropha seedling metabolism, interfering with plant establishment. In this study, the effect of salinity on the mobilization of reserves during the development of Jatropha seedlings was tested. Two genotypes of Jatropha were used and three concentrations of NaCl were applied between the 4th and 8th days after germination. The effects of salinity on seedling growth, in terms of fresh and dry phytomass, ionic partition, and sugar quantification, starch, proteins, amino acids, and lipids were evaluated in cotyledon leaves, hypocotyls, and roots. There was an increase in the content of all classes of macromolecules analyzed in at least one of the organs. It is hypothesized that the hypocotyls acted as an accumulating organ of Na+. The accumulations of amino acids and protein in roots suggest that metabolic responses occurred in response to the ionic and osmotic effects of NaCl, although this accumulation did not appear to prevent biomass losses in seedlings. Furthermore, the findings of this study demonstrate that salinity inhibits the mobilization of lipids and carbon stocks from cotyledon leaves to the rest of the plant, and together with the synthesis of proteins and amino acids that occurred primarily in roots, contributed to response of these plants to salinity.
O objetivo deste estudo foi revisar na literatura atual os métodos e variáveis do consumo máximo de oxigênio/potência aeróbia e aspectos relacionados com a capacidade aeróbia em pessoas com lesão da medula espinhal. Foi utilizada a busca através da base de dados Sciverse-com os seguintes termos: Spinal cord injury, Tetraplegia, Paraplegia cruzados com Physical endurance, Exercise tolerance, Peak oxygen consumption. Para inclusão no estudo os artigos deveriam obedecer os seguintes critérios a) avaliação da potencia aeróbia em pessoas com lesão da medula espinhal na fase crônica da lesão, b) resultados com tetraplégicos ou paraplégicos, c) interação dos itens anteriores com VO 2 máx (l/min ou ml/kg/min) e duração de esforço em cadeira de rodas, sendo publicados a partir do ano de 2000 até o presente momento da escrita do trabalho em 2012. Após cruzamentos de termos pré-selecionados, foram selecionados 26 artigos. A partir dos estudos revisados, observa-se uma grande variação de modelos, testes e maneiras de avaliar componentes fisiológicos relacionados aos sistemas cardiorrespiratórios e circulatórios. Esta gama de métodos parece estar relacionada à heterogeneidade da população/amostra e consequentemente, os resultados, por mais similares que sejam em alguns aspectos, apresentam valores discretos de proximidade, revelando uma necessidade de padronização para estes procedimentos nesta população. Com isto, é evidente a importância de estudos bem controlados e com nível tecnológico avançado para melhores prognósticos e acompanhamentos de pessoas com lesão da medula espinhal, seja para atividades esportivas, melhora de aspectos de riscos cardiovasculares ou para o cotidiano do dia a dia.
Methane Hydrates and Paraffin Plugs in flexible lines are concerns in offshore production. They may stop wells for months, causing high financial losses. Sometimes, operators use depressurization techniques for hydrate removal. Other strategy is using coiled tubing or a similar unit in order to perform local heating or solvent injection. However, frequently these strategies are not successful. In those cases, a rig may perform the operation or the line may be lost. This project developed a robotic system in order to perform a controlled local heating and remove obstructions. The robotic system developed is able to access the line from the production platform. It uses a self-locking system in order to exert high traction forces. An umbilical with neutral buoyancy and low friction coefficient allows significant drag reduction. It allows moving upwards and in pipes with a large number of curves. Coiled tubing and similar units cannot do that. Carbon fiber vessels and compact circuits give flexibility to move inside 4-inch flexible pipes. A novel theoretical model allows the cable traction calculation using an evolution of the Euler-Eytelwein equation. Experimental tests validated this model using curved pipes, both empty and filled with a fluid and using different loads. Experimental tests also validated the external layer traction resistance. Furthermore, the carbon fiber vessels were pressure tested, indicating a collapse resistance of more than 550 bar (8.000 psi). In addition, exhaustive tests of the onboard electronics and of the surface control system guarantee the communication reliability. Additionally, the 25 kN (5.6 kip) traction system was modeled theoretically considering the self-locking system, the contact with the wall and a diameter range. Four prototypes allowed to: a) compare hydraulic and electric drive systems, b) validate the self-locking mechanism up to its limit, c) analyze the hydraulic system for leg opening and translation and d) prove the traction capacity. Finally, a theoretical model for the local heating system was developed. The system experimental validation on a cooled environment demonstrated its capacity of increasing temperature. Furthermore, it allows the obstruction removal in a controlled manner, avoiding damage to the polymeric layer of the flexible line.
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