Electrical Potential Drop
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. AC Induced Corrosion of Underground Steel Pipelines. Faradaic Rectification under Cathodic Protection: II. Theoretical Approach with Electrolyte Resistance and Double Layer Capacitance for Bi-Tafelian Corrosion Mechanism
AC corrosion enhancement of buried steel pipe is induced by high stray AC electromagnetic field and to the faradaic rectification due to non-linearity of current-potential characteristics. In Part I, this phenomenon was evaluated by neglecting the electrical resistance of soil electrolyte. In this part, we will examine when this resistance is no longer negli
J. Braz. Chem. Soc.. Publicado em: 2016-03
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2. Use of Direct Current Resistivity Measurements to Assess AISI 304 Austenitic Stainless Steel Sensitization
This paper describes the feasibility of using direct current electrical resistivity measurements to evaluate AISI 304 austenitic stainless steel sensitization. ASTM A262 – Practice A and double loop electrochemical potentiodynamic reactivation (DL-EPR) tests were performed to assess the degree of sensitization (DoS) qualitatively and quantitatively, and el
Mat. Res.. Publicado em: 2015-04
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3. Desenvolvimento de metodologia experimental para aplicação de espécimes SE(T) para avaliação de integridade estrutural em dutos / Development of an experimental methodology for application of SE(T) specimens for pipeline structural integrity evaluation
Este trabalho apresenta o desenvolvimento e aplicação de espécimes SE(T) em aço API X60 para avaliação de integridade estrutural em dutos condutores de gás e petróleo, o qual consiste na implantação de três técnicas que forneçam as curvas de resistência à propagação dútil de trincas, curvas J-Rs. As metodologias utilizadas foram a da varia�
Publicado em: 2007
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4. The Effect of Cyanide and Carbon Monoxide on the Electrical Potential and Resistance of Cell Membranes 12
The rapid reduction in cell electropotentials induced by metabolic inhibitors is strong evidence for an electrogenic ion pump. According to Ohm's law, such a depolarization might be explained by a reduction in electric current, I, with unidirectional transport of a given ion, or an increase in permeability (decrease in resistance). With cells of etiolated se
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5. Characterization of electric-pulse-induced permeabilization of porcine skin using surface electrodes.
We measured the transient and long-term changes of permeability of full-thickness porcine skin after the application of a single or a train of electric pulses, as the basis for optimization of the electrical parameters for enhancing transdermal drug or gene delivery by electroporation. Two electrodes were attached to the stratum corneum of excised skin for t
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6. Effect of Changes in Hydrostatic Pressure in Peritubular Capillaries on the Permeability of the Proximal Tubule
The effect of increased hydrostatic pressure in the peritubular vessels on net sodium reabsorption from the proximal tubule was examined in the Necturus. An increase in the pressure gradient of 2.0 cm H2O across the wall of the proximal tubule, produced by ligation of the postcaval vein was associated with a marked reduction in net reabsorption and an increa
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7. Electrical constants of arterially perfused rabbit papillary muscle.
1. Right ventricular rabbit papillary muscles were arterially perfused with a mixture of Tyrode solution, bovine erythrocytes, dextran and albumin. In the recording chamber, they were surrounded by a H2O-saturated atmosphere of O2 and CO2 which served as an electrical insulator. 2. Conduction velocity and passive electrical properties were determined from in
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8. Generation of an electrochemical proton gradient in Streptococcus cremoris by lactate efflux.
Recently an energy-recycling model was proposed that postulates the generation of an electrochemical gradient in fermentative bacteria by carrier-mediated excretion of metabolic end products in symport with protons. In this paper experimental support for this model is given. In batch cultures of Streptococcus cremoris with glucose as the sole energy source t
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9. The saxitoxin/tetrodotoxin binding site on cloned rat brain IIa Na channels is in the transmembrane electric field.
The rat brain IIa (BrIIa) Na channel alpha-subunit and the brain beta 1 subunit were coexpressed in Xenopus oocytes, and peak whole-oocyte Na current (INa) was measured at a test potential of -10 mV. Hyperpolarization of the holding potential resulted in an increased affinity of STX and TTX rested-state block of BrIIa Na channels. The apparent half-block con
The Biophysical Society.
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10. Goa1p of Candida albicans Localizes to the Mitochondria during Stress and Is Required for Mitochondrial Function and Virulence▿ †
Using a Tn7 transposon library of Candida albicans, we have identified a mutant that exhibited sensitivity in drop plate assays to oxidants such as menadione and hydrogen peroxide. To verify the role of the mutated gene in stress adaptation, null mutants were constructed and phenotypically characterized. Because of its apparent functions in growth and oxidan
American Society for Microbiology (ASM).
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11. Reversible changes of the muscle cell in experimental phosphorus deficiency.
Both animal and human studies suggest that either phosphorus depletion or hypophosphatemia might have an adverse effect on muscle function and composition. Recently a possible deleterious effect was noted in patients with chronic alcoholism. In this unexplained disease, a variety of toxic and nutritional disturbances could affect the muscle cell, thus obscur
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12. Voltage-dependent magnesium block of adenosine-triphosphate-sensitive potassium channel in guinea-pig ventricular cells.
1. The adenosine-5'-triphosphate (ATP)-sensitive K+ channel of guinea-pig ventricular cells was examined in the presence and absence of internal Mg2+ or Na+ using an open cell-attached configuration of the patch-clamp technique. 2. Millimolar concentrations of internal Mg2+ ([Mg2+]i) produced marked fluctuations in the outward current, and the amplitude of t