Ionic Channels
Mostrando 1-12 de 315 artigos, teses e dissertações.
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1. Applicability of the Electro-Vectorcardiogram in Current Clinical Practice
Resumo O eletrocardiograma (ECG) foi revigorado com o reconhecimento de alterações elétricas que ainda não haviam sido observadas de maneira definitiva. Nesse contexto, principalmente na definição dos substratos arritmogênicos, a associação do ECG com o vetorcardiograma (VCG) propiciou mais informações sobre os fenômenos elétricos cardíacos, po
Arq. Bras. Cardiol.. Publicado em: 27/06/2019
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2. CO Oxidation Catalyzed by Ag Nanoparticles Supported on SnO/CeO2
Ag-Sn/CeO2 catalysts were synthesized by the co-precipitation method with different Ag-Sn wt.% loadings and were tested for the oxidation of CO. The catalysts were characterized by powder X-ray diffractometry (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDS), and s
J. Braz. Chem. Soc.. Publicado em: 2015-04
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3. Modelagem da Microestrutura de Tecidos Cardíacos
A few decades ago the cardiac tissue was believed to be an uniformly connected continumm. Currently, it is known that the cardiac cells are connected to each other via special protein channels called gap junctions, through which the ionic current flows between neighboring cells. The cardiac cells are arranged in distinct layers of muscle fibers surrounded by
Publicado em: 2011
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4. TRANSPORTE E HOMEOSTASE Na+/K+ SOB CONDIÃÃES DE SODICIDADE EM FEIJÃO CAUPI / Na+ and K+ transport and homeostasis under sodicity conditions in cowpea
High soil salinity can be associated with K+ starvation enabling interactive stresses on plant nutrition that impair crop production. The transport mechanisms on the soil-root symplast-xylem boundaries are crucial to the establishment of Na+ toxicity under salt stress, especially under low K+ availability. Then, the aim of this work was the physiological cha
Publicado em: 2008
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5. A mechanistic view of mitochondrial death decision pores
Mitochondria increase their outer and inner membrane permeability to solutes, protons and metabolites in response to a variety of extrinsic and intrinsic signaling events. The maintenance of cellular and intraorganelle ionic homeostasis, particularly for Ca2+, can determine cell survival or death. Mitochondrial death decision is centered on two processes: in
Brazilian Journal of Medical and Biological Research. Publicado em: 12/04/2007
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6. Estudo do Segmento Consenso Adjacente ao Domínio TM2 e parte do Domínio TM2 do Receptor P2X7: Dinâmica Molecular e Atividade de Canal Iônico. / Study of the segment adjacent consensus to domain TM2 and part of domain TM2 of receiver P2X7: molecular dynamics and activity of ionic canal.
The purinergic receptor P2X7 (P2X7R) is a membrane protein which forms channels in the presence of extracellular ATP. Once opened, the channels allow the transport of cations through the cellular membrane, being expressed preferentially in immune cells. Among all purinergic receptors, P2X7R has distinct characteristics from other P2X (P2XR) members. For exam
Publicado em: 2007
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7. Desenvolvimento embrionário em ratas wistar prenhes submetidas ao ultra-som terapêutico de 3 MHz
Therapeutic ultrasound is widely used in different aesthetic treatment by young women, who can be irradiated during early gestation. Researches regarding the effects of therapeutic ultrasound on gestation present controversial results. Methodologies incompatible with clinical aspects are used and different methods and technics were employed. However none of
Publicado em: 2007
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8. "Computational simulations biologically plausible of neurons of the primary somatosensory cortex" / "Simulações computacionais biologicamente plausíveis de neurônios do córtex somestésico primário"
Since its appearance, the computer has been used to model phenomena in all areas of knowledge. In neuroscience, computer modeling is used to describe, reproduce and predict behaviors of different components of the nervous system. As well as in other areas of sciences, this procedure has been shown to be efficient in the study and improvement of theories on b
Publicado em: 2006
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9. Modelo caótico e a memória da cinética dos canais iônicos / Modelo caótico e a memória da cinética dos canais iônicos
Canais iônicos são compostos de uma ou poucas moléculas de proteínas que se encontram nas membranas biológicas e constituem uma das vias possíveis para o transporte de íons através dessas membranas. Essas proteínas podem assumir diferentes estados conformacionais, abertos e fechados, fenômeno denominado de cinética de canais iônicos. As transiç�
Publicado em: 2006
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10. NITRIC OXIDE MODULATES THE IMPROVEMENT OF THE MEMORY INDUCED BY SPERMIDINE IN RAT / ÓXIDO NÍTRICO MODULA A MELHORA DA MEMÓRIA INDUZIDA POR ESPERMIDINA EM RATOS
The endogenous poliaminas, putrescine, spermidina and spermine are aliphatics amines that are present in high concentrations in the central nervous system (SNC). The action of the poliamines involves the modulation of several ionic channels, including the subtype of glutamatergic N-methyl-D-aspartate receptor (NMDA). The processes mediated by NMDA receptor i
Publicado em: 2006
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11. Estudo das propriedades biofísicas e farmacológicas do poro associado ao receptors P2X7 e poros de características similares. / Study of the biophysical and pharmacological properties of the pore associated with receiver P2X7 and pores of similar characteristics.
The P2X7 receptor (EC50= ~100μM) induces cell membrane permeabilization to molecules up to 900 Da when activated by high ATP concentrations. So far, the correlation between the opening of low conductance cationic channel (8 pS) formed after stimulation with low ATP concentrations (EC50= ~1 μM) and the opening of P2X7 related pore is unclear. To dat
Publicado em: 2006
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12. Skin secretion of Siphonops paulensis (Gymnophiona, Amphibia) forms voltage-dependent ionic channels in lipid membranes
The effect of the skin secretion of the amphibian Siphonops paulensis was investigated by monitoring the changes in conductance of an artificial planar lipid bilayer. Skin secretion was obtained by exposure of the animals to ether-saturated air, and then rinsing the animals with distilled water. Artificial lipid bilayers were obtained by spreading a solution
Brazilian Journal of Medical and Biological Research. Publicado em: 2003-09