307 resultados para 1443
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Pie de imp. tomado del colofón
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Aims Dehesas are agroforestry systems characterized by scattered trees among pastures, crops and/or fallows. A study at a Spanish dehesa has been carried out to estimate the spatial distribution of the soil organic carbon stock and to assess the influence of the tree cover. Methods The soil organic carbon stock was estimated from the five uppermost cm of themineral soil with high spatial resolution at two plots with different grazing intensities. The Universal Kriging technique was used to assess the spatial distribution of the soil organic carbon stocks, using tree coverage within a buffering area as an auxiliary variable. Results A significant positive correlation between tree presence and soil organic carbon stocks up to distances of around 8 m from the trees was found. The tree crown cover within a buffer up to a distance similar to the crown radius around the point absorbed 30 % of the variance in the model for both grazing intensities, but residual variance showed stronger spatial autocorrelation under regular grazing conditions. Conclusions Tree cover increases soil organic carbon stocks, and can be satisfactorily estimated by means of crown parameters. However, other factors are involved in the spatial pattern of the soil organic carbon distribution. Livestock plays an interactive role together with tree presence in soil organic carbon distribution.
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Contiene con port. y pag. propia: "Oracion panegirica gratulatoria en las plausibles fiestas que celebrò la ... Villa de Alzira ... en la ... proclamacion de ... Fernando VI ... / que dixo ... Fr. Antonio Salanova, religioso agustino ...
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Index
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Inic. y titulillos en tinta roja y azul
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Esta pesquisa parte do interesse de análise da contribuição da missionária Ana Wollerman para o crescimento da denominação batista no sul de Mato Grosso e Mato Grosso do Sul, no período compreendido entre os anos de 1948 a 1978. A memória religiosa e autobiográfica da missionária apresenta experiências com o sagrado que marcam divisores de fases e temporalidades no seu recorte biográfico e que influenciam decisivamente na postura ministerial adotada. As entrevistas com algumas pessoas que participaram das comunidades afetivas existentes e os registros nas atas lidas constatam em grande parte os dados coletados pela memória. Ana Wollerman, filha de descendentes de alemães nos E.U.A., graduou-se em Artes e pósgraduou- se em Educação Religiosa. Veio para o Brasil inicialmente como missionária sem depender do sustento financeiro de uma Junta Missionária, fundou diversas escolas de ensino primário, trabalhou na implantação de diversas igrejas e dedicou grande parte de seus esforços no ensino ministerial. Foi responsável pela ajuda financeira no sustento de mais de uma dezena de jovens nos Seminários de Curitiba-PR, no IBER-RJ e no Seminário do Sul-RJ. Contribuiu também para que fossem destinadas grandes ofertas para a construção do Seminário Teológico Batista em Dourados. O trabalho procura seguir uma metodologia ainda em construção no que se refere à memória religiosa e utiliza o referencial teórico de Maurice Halbwachs para apresentar as memórias individuais e construção da memória coletiva, bem como tem apoio no próprio Halbwachs ao trabalhar a leitura da formação das comunidades afetivas. Aliado a estas questões se presta como um primeiro tratado sobre a historiografia da denominação batista em Mato Grosso e Mato Grosso do Sul, reunindo aspectos da sua gênese e do seu desenvolvimento. O resgate e a valorização da memória do sujeito-objeto em questão, ainda em vida constitui também no reconhecimento que a academia pode prestar às pessoas e às comunidades que se dedicam à construção de um mundo melhor.(AU)
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Peer reviewed
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Polyaniline/montmorillonite nanocomposites (PANI/M) were obtained by intercalation of aniline monomer into M modified with different cations and subsequent oxidative polymerization of the aniline. The modified-clay was prepared by ion exchange of sodium, copper and iron cations in the clay (Na–M, Cu–M and Fe–M respectively). Infrared spectroscopy confirms the electrostatic interaction between the oxidized PANI and the negatively charged surface of the clay. X-ray diffraction analysis provides structural information of the prepared materials. The nanocomposites were characterized by transmission electron microscopy and their thermal degradation was investigated by thermogravimetric analysis. The weight loss suggests that the PANI chains in the nanocomposites have higher thermal stability than pure PANI. The electrical conductivity of the nanocomposites increased between 12 and 24 times with respect to the pure M and this increase was dependent on the cation-modification. The electrochemical behavior of the polymers extracted from the nanocomposites was studied by cyclic voltammetry and a good electrochemical response was observed.
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A simple method was used to synthesize poly(2-aminophenol), poly(2-aminophenol-co-Aniline) and polyaniline nanocomposites with sodium-montmorillonite (Na-M) using in situ intercalative oxidative polymerization. Morphology and thermal properties of the synthesized nanocomposites were examined by transmission electron microscopy (TEM) and thermogravimetric analysis. The thermal analysis shows an improved thermal stability of the nanocomposites in comparison with the pure poly(2-aminophenol). The intercalation of polymers into the clay layers was confirmed by X-ray diffraction studies, TEM images and FTIR spectroscopy. In addition, the room temperature conductivity values of these nanocomposites varied between 8.21 × 10−5 and 6.76 × 10−4 S cm−1. The electrochemical behavior of the polymers extracted from the nanocomposites, has been analyzed by cyclic voltammetry. Good electrochemical response has been observed for polymer films; the observed redox processes indicate that the polymerization into Na-M produces electroactive polymers.
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High-voltage-activated calcium channels are hetero-oligomeric protein complexes that mediate multiple cellular processes, including the influx of extracellular Ca2+, neurotransmitter release, gene transcription, and synaptic plasticity. These channels consist of a primary α1 pore-forming subunit, which is associated with an extracellular α2δ subunit and an intracellular β auxiliary subunit, which alter the gating properties and trafficking of the calcium channel. The cellular localization of the α2δ3 subunit in the mouse and rat retina is unknown. In this study using RT-PCR, a single band at ∼305 bp corresponding to the predicted size of the α2δ3 subunit fragment was found in mouse and rat retina and brain homogenates. Western blotting of rodent retina and brain homogenates showed a single 123-kDa band. Immunohistochemistry with an affinity-purified antibody to the α2δ3 subunit revealed immunoreactive cell bodies in the ganglion cell layer and inner nuclear layer and immunoreactive processes in the inner plexiform layer and the outer plexiform layer. α2δ3 immunoreactivity was localized to multiple cell types, including ganglion, amacrine, and bipolar cells and photoreceptors, but not horizontal cells. The expression of the α2δ3 calcium channel subunit to multiple cell types suggests that this subunit participates widely in Ca-channel-mediated signaling in the retina.
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Biomechanical adaptations that occur during pregnancy can lead to changes on gait pattern. Nevertheless, these adaptations of gait are still not fully understood. The purpose was to determine the effect of pregnancy on the biomechanical pattern of walking, regarding the kinetic parameters. A three-dimensional analysis was performed in eleven participants. The kinetic parameters in the joints of the lower limb during gait were compared at the end of the first, second, and third trimesters of pregnancy and in the postpartum period, in healthy pregnant women. The main results showed a reduction in the normalized vertical reaction forces, throughout pregnancy, particularly the third peak. Pregnant women showed, during most of the stance phase, medial reaction forces as a motor response to promote the body stability. Bilateral changes were observed in hip joint, with a decrease in the participation of the hip extensors and in the eccentric contraction of hip flexors. In ankle joint a decrease in the participation of ankle plantar flexors was found. In conclusion, the overall results point to biomechanical adjustments that showed a decrease of the mechanical load of women throughout pregnancy, with exception for few unilateral changes of hip joint moments.
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Sign.: a8, a-z6, A-Z6, 2A-2M6, 2N4, 2A-2G6, 2H8, 2I-2K6, 2L4
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Sign.: A-B4