Swimming Turn
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Avaliação da virada no nado crawl : efeito do feedback extrínseco nos indicadores biomecânicos de desempenho / Evaluation of turn in front crawl stroke : the effect of extrinsic feedback on biomechanical performance indicators
Este trabalho teve como objetivo avaliar o efeito do feedback extrínseco, a partir de avaliações biomecânicas, na virada no nado crawl. Caracterizou-se como um estudo experimental com a participação de 22 nadadores de 13 a 37 anos, de ambos os sexos e com tempo de treinamento de natação superior 1.5 anos. Após o pré-teste os nadadores foram agrupad
Publicado em: 2008
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2. Propose a procedure for swimming turns analysis / Proposição de uma metodologia para coleta de dados da virada no nado crawl
Este estudo teve como objetivo propor uma metodologia para realização de coletas de dados na virada no nado Crawl, através de métodos de medições biomecânicas levando em consideração a distância para analise da performance e o número de execuções. É caracterizado como um estudo descritivo. Os dados foram coletados nas dependências da piscina d
Publicado em: 2007
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3. Restrição proteica e estresse oxidativo em ratos submetidos ou não ao exercicio fisico
Malnourished human beings and animais show impaired function in several organs, which is not a fully reversed by nutritional recovery. Physical training, in turn, accelerates some aspects of nutritional recovery. There are few data on the participation of oxidative stress in the functional impairment imposed by malnutrition. The literatura locks information
Publicado em: 2005
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4. Turn angle and run time distributions characterize swimming behavior for Pseudomonas putida.
The swimming behavior of Pseudomonas putida was analyzed with a tracking microscope to quantify its run time and turn angle distributions. Monte Carlo computer simulations illustrated that the bimodal turn angle distribution of P. putida reduced collisions with obstacles in porous media in comparison to the unimodal distribution of Escherichia coli.
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5. Unidirectional motility of Escherichia coli in restrictive capillaries.
In a 6-microns capillary filled with buffer and in the absence of any chemotactic stimuli, Escherichia coli K-12 cells swim persistently in only one direction. This behavior of E. coli can be simply explained by means of the length and relative rigidity of their flagella. Single-cell motility parameters--swimming speed, turn angle, and run length time--were
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6. Mechanisms and Rates of Bacterial Colonization of Sinking Aggregates
Quantifying the rate at which bacteria colonize aggregates is a key to understanding microbial turnover of aggregates. We used encounter models based on random walk and advection-diffusion considerations to predict colonization rates from the bacteria's motility patterns (swimming speed, tumbling frequency, and turn angles) and the hydrodynamic environment (
American Society for Microbiology.
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7. Temperature-Sensitive Motility of Sulfolobus acidocaldarius Influences Population Distribution in Extreme Environments
A three-dimensional tracking microscope was used to quantify the effects of temperature (50 to 80°C) and pH (2 to 4) on the motility of Sulfolobus acidocaldarius, a thermoacidophilic archaeon. Swimming speed and run time increased with temperature but remained relatively unchanged with increasing pH. These results were consistent with reported changes in th
American Society for Microbiology.
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8. Chemotactic Signaling by an Escherichia coli CheA Mutant That Lacks the Binding Domain for Phosphoacceptor Partners
CheA is a multidomain histidine kinase for chemotaxis in Escherichia coli. CheA autophosphorylates through interaction of its N-terminal phosphorylation site domain (P1) with its central dimerization (P3) and ATP-binding (P4) domains. This activity is modulated through the C-terminal P5 domain, which couples CheA to chemoreceptor control. CheA phosphoryl gro
American Society for Microbiology.
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9. Bacterial flagella rotating in bundles: a study in helical geometry.
Bacterial flagella are semi-rigid helices that undergo true rotation. In peritrichously flagellated bacteria (e.g., Escherichia and Salmonella) there are many flagella on each cell; during translational cell movement these operate as a coordinated bundle that actively disperses upon reversal of the rotation sense. The dynamic behavior of a set of helices ori
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10. How Chlamydomonas keeps track of the light once it has reached the right phototactic orientation.
By using a real-time assay that allows measurement of the phototactic orientation of the unicellular alga Chlamydomonas with millisecond time resolution, it can be shown that single photons not only induce transient direction changes but that fluence rates as low as 1 photon cell(-1) s(-1) can already lead to a persistent orientation. Orientation is a binary
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11. Coupling the phosphotransferase system and the methyl-accepting chemotaxis protein-dependent chemotaxis signaling pathways of Escherichia coli.
Chemotactic responses in Escherichia coli are typically mediated by transmembrane receptors that monitor chemoeffector levels with periplasmic binding domains and communicate with the flagellar motors through two cytoplasmic proteins, CheA and CheY. CheA autophosphorylates and then donates its phosphate to CheY, which in turn controls flagellar rotation. E.