968 resultados para tipo de fibra muscular


Relevância:

30.00% 30.00%

Publicador:

Resumo:

With the increasing demand for electricity, the retraining of transmission lines is necessary despite environmental restrictions and crossings in densely populated areas to build new transmission and distribution lines. Solution is reuse the existent cables, replacing the old conductor cables for new cables with higher capacity power transmission, and control of sag installed. The increasing demand for electrical power has increased the electric current on the wires and therefore, it must bear out temperatures of 150°C or more, without the risk of the increasing sag beyond the established limits. In the case of long crossings or densely populated areas, sag is due to high weight of the cable on clearance. The cable type determines the weight, sag, height and the towers dimensions, which are the items that most influence the investment of the transmission line. Hence, to reduce both cost of investment and maintenance of the line, the use of a lighter cable can reduce both number and the height of the towers, with financial return on short and long term. Therefore, in order to increase the amount of transmitted energy and reduce the number of built towers and sag, is recommended in the current work substitute the current core material (steel or aluminium) for alternatives alloys or new materials, in this case a composite, which has low density, elevated stiffness (elasticity module), thus apply the pultruded carbon fiber with epoxy resin as matrix systems and perform the study of the kinetics of degradation by thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC), according to their respective standards

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Conventional resistance training (TRC) is capable to generate muscular responses according to provided stimuli, as, training volume and intensity. The TRC results in force gains in general. Studies aim this gain to neural adaptation initially, followed by hypertrophy gains. However, studies that used TRC associated to blood flow restriction (RFS) found rise in force and hypertrophy without necessarily detecting rise in neural activity. Therefore this review had as objective, bring up literature data that report this fact and yet, speculate possible elucidation about this responses inversion

Relevância:

30.00% 30.00%

Publicador:

Resumo:

A doença de Charcot-Marie-Tooth (CMT) é a mais freqüente das neuropatias hereditárias, mas a sua história natural é pouco conhecida. Apesar da maioria dos pacientes apresentarem uma evolução com características mais “benignas”, é associado à doença com um comprometimento funcional, o que pode ser acompanhado de limitações e incapacitações. O presente estudo teve como objetivo avaliar a qualidade de vida de pacientes afetados pela CMT1A. Considerando que a qualidade de vida pode sofrer influência de variáveis sócio-culturais, um estudo neste contexto mostra-se oportuno. Nenhum estudo de nosso conhecimento realizou tal avaliação no contexto brasileiro. Fizeram parte deste estudo pacientes com CMT decorrente da duplicação 17p11.2-p12 (CMT1A) que foram avaliados quanto ao comprometimento funcional por meio da aplicação do SF-36. Esse questionário é utilizado internacionalmente para aferir a qualidade de vida dos indivíduos. Os resultados obtidos foram submetidos à análise estatística. Como resultados não se observaram associações entre o gênero e os domínios avaliados para a qualidade de vida. Os dados obtidos revelaram que a qualidade de vida dos pacientes com CMT1A se mostrou comprometida principalmente quanto aos seus Aspectos Sociais (p = 0,02) e Aspectos emocionais (p = 0,04). Adicionalmente, houve uma tendência ao comprometimento da Capacidade Funcional (p = 0,08), sendo que os outros índices de avaliação de comprometimento físico se mostraram preservados. A presença ou ausência de ocupação parece influenciar os Aspectos Sociais apresentando uma tendência de diferença significativa (p = 0,07), possuindo o grupo com ocupação valores superiores. Apesar da CMT1A apresentar piora clínica ao longo dos anos, a idade mais avançada não implicou em uma pior percepção da qualidade de vida no grupo de pacientes estudados no presente trabalho... (Resumo completo, clicar acesso eletrônico abaixo)

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Introduction: the oral rehabilitation in edentulous patients using removable complete dentures is a classic treatment, easily accessible, and presenting satisfactory results. However, to succeed in this type of treatment, stability is an extremely important factor. The neutral zone technique for the production of complete dentures determines the oral cavity space for the positioning of teeth and denture base that provide a neutralization of the forces delivered by lips, cheeks, and tongue, providing better stability and retention of prostheses, which is indicated in cases with history of difficulties in adapting the conventional mandibular denture. Objective and case report: this paper aimed to describe a clinical case report of the oral rehabilitation of a patient with paraprosthetic muscles hypertonicity through removable complete dentures produced by the neutral zone technique, using condensation silicone. Final considerations: the use of condensation silicone for the development of the neutral zone technique showed to be a good alternative for the development of this clinical case, providing satisfactory stability and retention of the complete mandibular denture.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Pós-graduação em Ciências da Motricidade - IBRC

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Pós-graduação em Ciências da Motricidade - IBRC

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Akt (also called PKB) is a 63 kDa serine/threonine kinase involved in promotion of cell survival, proliferation a nd metabolic responses downstream the phosphoinositide-3-kinase (PI 3-kinase) signaling pathway. In resting cells, Akt is a predominantly cytosolic enzyme; however generation of PI 3-kinase lipid products recruits Akt to the plasma membrane, resulting in a conformational change which confers full enzymatic activity through the phosphorylation of the membrane-bound protein at two residues, Thr308, and Ser473. Activated Akt redistributes to cytoplasm and nucleus, where phosphorylation of specific substrates occurs. Both the presence and the activity of Akt in the nucleus have been described. An interesting mechanism that mediates nuclear translocation of Akt has been described in human mature T-cell leukemia: the product of TCL1 gene, Tcl1, interacts with the PH domain of phosphorylated Akt, thus driving Akt to the nucleus. In this context, Tcl1 may act as a direct transporter of Akt or may contribute to the formation of a complex that promotes the transport of active Akt to the nucleus, where it can phosphorylate nuclear substrates. A well described nuclear substrate if Foxo. IGF-1 triggers phosphorylation of Foxo by Akt inside the nucleus, where phospho-Foxo associates to 14.3.3 proteins that, in turn, promote its export to the cytoplasm where it is sequestered. Remarkably, Foxo phosphorylation by Akt has been shown to be a crucial event in Akt-dependent myogenesis. However, most Akt nuclear substrates have so far remained elusive, as well as nuclear Akt functions. This lack of information prompted us to undertake a search of substrates of Akt in the nucleus, by the combined use of 2D-separation/mass spectrometry and anti-Akt-phosphosubstrate antibody. This study presents evidence of A-type lamins as novel nuclear substrates of Akt. Lamins are type V intermediate filaments proteins found in the nucleus of higher eukaryotes where, together with lamin-binding proteins, they form the lamina at the nuclear envelope, providing mechanical stability for the nuclear membrane. By coimmunoprecipitation, it is demonstrated here that endogenous lamin A and Akt interact, and that A-type lamins are phosphorylated by Akt both in vitro and in vivo. Moreover, by phosphoaminoacid analysis and mutagenesis, it is further demonstrated that Akt phosphorylates lamin A at Ser404, and, more importantly, that while lamin A/C phosphorylation is stable throughout the cell cycle, phosphorylation of the precursor prelamin A becomes detectable as cells enter the G2 phase, picking at G2/M. This study also shows that lamin phosphorylation by Akt creates a binding site for 14.3.3 adaptors which, in turn, promote prelamin A degradation. While this mechanism is in agreement with a general role of Akt in the regulation of a subset of its substrates, opposite to what has been described, degradation is not mediated through a ubiquitination and proteasomal mechanism but through a lysosomal pathway, as indicated by the reverting action of the lysosomal inhibitor cloroquine. Phosphorylation is a key event in the mitotic breakdown of the nuclear lamina. However, the kinases and the precise sites of phosphorylation are scarcely known. Therefore, these results represent an important breakthrough in this very significant but understudied area. The phosphorylation of the precursor protein prelamin A and its subsequent degradation at G2/M, when both the nuclear envelop and the nuclear lamina disassemble, can be view as part of a mechanism to dispose off the precursor that is not needed in this precise context. The recently reported finding that patients affected by Emery-Dreifuss muscular dystrophy carry a mutation at Arg 401, in the Akt phosphorylation motif, open new perspective that warrant further investigation in this very important field.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Cuando se habla de alimentación saludable, se aconsejan cuatro comidas diarias y dos colaciones en base a frutas o lácteos. Sin embargo, existe una tendencia a limitar el número de comidas, debido al ritmo de vida que se lleva actualmente y, a su vez,a aumentar el número de ocasiones en el día donde se comen pequeñas cantidades de comidas a intervalos irregulares, especialmente “snacks". Convirtiéndose un componente muy importante de la dieta, siendo fuente de calorías adicionales que podrían o no estar indicados en el plan alimentario adecuado. El problema detona a partir de la última década, ya que ha crecido notablemente, en varios países del mundo (tanto en países desarrollados como en aquellos que se encuentran en vías de desarrollo), la prevalencia de sobrepeso y de obesidad, considerándose, por ello, una epidemia global y siendo la enfermedad crónica no transmisible más prevalente en estos tiempos (Archivos Argentinos de Pediatría, 2005). Reconociéndose como un gran problema de salud pública, según la Organización Mundial de la Salud (OMS), que conlleva a otras enfermedades no transmisibles. Por esto, el consumidor comienza a preocuparse por tener una alimentación saludable y se hace necesario el desarrollo de snacks que se adapten a esta necesidad. El objetivo general de este proyecto es desarrollar galletas saladas tipo snack mejorando sus características nutricionales, rediseñando las formulaciones para que sean atractivas al consumo utilizando las propiedades beneficiosas a la salud del aceite de oliva virgen, por el alto contenido de ácidos grasos monoinsaturados, la buena relación de ácido graso linoleico (omega 6) y el ácido graso linolénico (omega 3), y por el contenido de sustancias antioxidantes. (Alonso, 1993). El desarrollo del producto comenzó con la pre-selección de 9 formulaciones de galletas que coincidieran con las características deseadas, estas fueron sometidas a una evaluación sensorial realizada por 20 evaluadores semi entrenados, resultando elegidas, cinco de ellas. Las formulaciones elegidas fueron sometidas a análisis físico-químicos, a fin de obtener el perfil lipídico de cada una de ellas y su composición centesimal. Una vez obtenida esta información, se efectuó una comparación con snacks que se encontraban el circuito comercial, en los años 2010 y 2014. Por otra parte, se realizó una nueva evaluación sensorial con 100 alumnos de la Facultad de Ciencias Agrarias, a fin de determinar el grado de aceptación. Como conclusión, con respecto al perfil lipídico, se observó un mejoramiento destacado en ambas comparaciones, tanto con respecto a las galletas comerciales de la actualidad, y mucho más notorio, en las del año 2010. Además, se obtuvieron mejores características nutricionales, especialmente con respecto al contenido de sodio y de fibra, en relación al snack presente en el mercado. Desde el punto de vista organoléptico, todas las formulaciones tuvieron buena aceptación.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

El presente trabajo se refiere al estudio teórico-experimental del comportamiento de pilares y vigas de hormigón armado reforzados con fibra de carbono o CFRP. El análisis se realiza considerando que los pilares se refuerzan mediante la técnica de adhesión de tejidos de fibra de carbono, generando un efecto de confinamiento. Las vigas se refuerzan mediante la incorporación de barras del mismo material, con refuerzos a cortante. El objetivo es poder comparar el estudio analítico de este tipo de refuerzos con resultados experimentales obtenidos con anterioridad a la realización de este documento, y así poder obtener conclusiones de las posibles diferencias. Hay que señalar que los modelos experimentales no forman parte de este estudio. Los ensayos en pilares fueron realizados en sección cuadrada y circular evaluando la rotura a compresión de las piezas, habiendo sido éstas escaladas con un factor de reducción de 2,3. Los ensayos correspondientes a vigas se realizaron en sección rectangular, centrándose en la evaluación de la rotura a flexión y habiendo sido escaladas igualmente, pero con un factor de reducción de 1:2. El documento se estructura en cuatro capítulos, cuyo contenido se expone de forma concisa a continuación. En el capítulo uno o marco teórico se exponen los principios de comportamiento y tipologías de los pilares y vigas de hormigón armado, las bases teóricas de su refuerzo y confinamiento, así como las diversas técnicas de refuerzo existentes. Se detalla la técnica con FRP, comparando y analizando sus ventajas e inconvenientes. En el capítulo dos se expone el proceso de fabricación, refuerzo y resultados de los modelos experimentales realizados para ambos elementos estructurales. La obtención de los modelos teóricos forma parte del capítulo tres, comparándose con los resultados experimentales en el cuarto capítulo. Finalmente, en el último capítulo se presentan las conclusiones obtenidas al realizar esta comparativa en el refuerzo de vigas y pilares con fibra de carbono. This work refers to the theoretical and experimental study of the behavior of CFRP reinforced concrete columns and beams. The analysis was done considering that the pillars are reinforced by CFRP wrapping technique, resulting in a confinement effect. The beams are reinforced by the addition of bars of the same material, with shear reinforcements. The objective is to compare the analytical study of this type of reinforcement with experimental results obtained prior to the performance of this document, and draw conclusions for any differences. Notice that experimental models are not part of this study. The tests were performed on circular and square section pillars, evaluating compression fracture of the pieces, having been scaled down with a factor of 2.3. The tests were performed on rectangular section beams, focusing on evaluation of the bending fracture and being scaled down equally, but with a factor of 1:2. The document is divided into four chapters, whose content is set out concisely below. The chapter one or theoretical framework sets out the principles of behavior and types of columns and beams of reinforced concrete, the theoretical basis of its reinforcement and confinement, as well as various existing reinforcement techniques. CFRP technique it’s detailed, comparing and analyzing their advantages and disadvantages. Chapter two describes the process of manufacture, reinforcement and results of experimental models made for both structural elements. Chapter three shows the obtaining of the theoretical models, comparing them with the experimental results in the fourth chapter. Finally, the last chapter presents the conclusions to make this comparison in the strengthening of beams and columns with carbon fiber.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

El empleo de hormigones de altas prestaciones es necesario para dar una mejor respuesta a los requisitos técnicos de obras de rehabilitación. Este tipo de hormigones, además de unas elevadas prestaciones mecánicas, permiten obtener una alta trabajabilidad para rellenar elementos de espesores reducidos, una durabilidad adecuada, para resistir la agresividad del medio, y una buena calidad de acabados. Este trabajo persigue optimizar el diseño de mezclas de hormigones autocompactantes fibrorreforzados con fibra sintética de manera que, sin perder la condición de autocompactabilidad, cumplan las especificaciones recogidas en el Anejo 14 de la EHE-08 para la consideración de la fibra con función estructural, lo que permitiría la sustitución total o parcial de armaduras de acero. Por tanto, la ejecución de obras de rehabilitación con esta tipología de hormigones permite por un lado una puesta en obra rápida y de calidad, y por otro evitar aparición de procesos patológicos derivados de la corrosión de las armaduras.