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Showing 1 to 20 of 32 for “"Potassium ions"”.
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Adequação da metodologia para testes bioquímicos em diásporos de schinopsis brasiliensis engler.
… of electrical conductivity and lixiviation of potassium in diaspores of Schinopsis brasiliensis Engler. This work was conducted at the Seed Analysis Laboratory of the Center for Agricultural Sciences, Federal University of Paraíba. The seeds were processed and separated into two treatments: no …
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Studies on the mode of action of the pyrithione biocides
… studies indicated direct chemical interactions between the pyrithiones and cysteine and the pyrithiones and phosphatidylethanolamine. Oxygen electrode studies exhibited low levels of pyrithione induced inhibition of substrate metabolism for several substrates in both <i>E. coli</i> and …
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Supramolecular assemblies of conjugated sensory polymers and the optimization of transport properties
… different sensory systems for the detection of potassium ions and a nitroaromatic explosive TNT, respectively, key chemical design parameters governing their selectivity have been rationalized. Finally, the combination of the conclusions of this thesis provided an idealized structure of a …
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Characterization of the Central Cavity of a Potassium Channel: Helix Dipoles, Conformational Plasticity and Inhibition
<p>Potassium channels are important for regulating the flow of potassium ions across semi-permeable cell membranes in an efficient and selective manner. Potassium channels form a conduction pore comprised of a selectivity filter responsible for the strong preference for potassium, and a …
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Studies on the characterization of a soluble factor of a sodium-activated, magnesium-dependent adenosinetriphosphatase in rat cerebral cortex
… an operational barrier to the free diffusion of ions. This tends to explain the fact that the ionic composition of the cytoplasm of the animal cell differs from its external fluid environment.</p><p>It is well know that where sodium is the principal cation of the extracellular fluid, potassium …
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Potassium and Sodium Movements Related to Growth State and Malignant Transformation in Cultured Chicken Embryo Cells
Aspects of sodium-potassium pump regulation were examined in growing normal, density-inhibited, and Rous sarcoma virus-transformed (RSV-transformed) chicken embryo fibroblasts and following serum stimulation of quiescent, density-inhibited chicken embryo fibroblasts. Active potassium transport and …
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A Study of Ionic Permeability Changes Underlying Excitation in Myelinated Nerve Fibers of the Frog
<p>Investigations by Huxley and Stämpfli of the dependence of the resting potential and of the action potential at the node of Ranvier upon the ionic composition of the bathing medium provided evidence that the electrical activity resulted from a sequential alteration of the membrane permeability …
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Computational analyses on the structure-function relation in ion channels
… a crucial role in several physiological functions, like nerve transmission, muscular contraction, and secretion. Besides, ion channels can be used in technological applications for different purpose (sensing of organic molecules, DNA sequencing). As a result, there is remarkable interest in …
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Evolution of Voltage-gated Ion Channels
… the transfer of charged sodium, calcium, and potassium ions across the cell membrane (Hodgkin & Huxley 1952). The channels contain a selective ion-conducting pore along with several other structural and gating features that come together to form a functional hetero- or homotetramer. A …
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USE OF MOLECULAR APPROACHES TO STUDY THE OCCURRENCE OF EXTREMOPHILES AND EXTREMODURES IN NON-EXTREME ENVIRONMENTS
… spectophotometery (AES) to measure the cellular potassium ions. In addition, ultraviolet-type C tolerant bacteria were isolated from terrestrial environments using phylogenetic analysis of the 16S rRNA gene sequences. A selection of other molecular techniques were used in this thesis. Fluorescent …
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The effect of cis-5,8,11,14,17-eicosapentaenoic acid upon the contractile mechanisms linked to calcium influx and the mobilisation of intracellular calcium in aortic smooth muscle
… system. Although clinical investigations demonstrated its usefulness in surgical procedures, its mechanism of action still remained unclear. It was shown in this thesis, that EPA partially blocked the contraction of aortic smooth muscle cells to the vasoactive agents KCl and …
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Arene bridged diuranium compounds supported by amide and ketimide ligands
… of density functional theory (DFT) calculations performed on model compounds. Reactivity studies of lb2-p-toluene are then presented and analyzed. Chapter 2: Arene Bridged Diuranium Complexes Supported by a Ketimide Ligand: Even and Odd Electron Redox Pairs The ketimide ligand NC[t-Bu]Mes …
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Evaluating bacterial cell immobilization matrices for use in a biosensor
… that contains bacteria that naturally effluxes potassium ions when threatened by electrophilic species. Pseudomonas aeruginosa is an activated sludge isolate and possesses the characteristic potassium efflux response. It has been immobilized in calcium alginate beads, photopolymer disks, and a …
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Computational Studies on Nucleic Acid-Ion Interactions in Droplets and Bulk Solution
Interactions of macromolecules with ions in solution have a long history of study because of their ubiquitous nature. These interactions are essential for the stability and function of macromolecules such as nucleic acids. Nucleic acids are involved in many natural biochemical processes. For …
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DESCRIPTION OF POLARONS IN LAYERED TRANSITION METAL OXIDES USING THE r2SCAN DENSITY FUNCTIONAL WITH FULLY NONLOCAL CORRECTIONS AND EFFECT OF STRAIN ON THE BAND GAP OF MONOLAYER MOLYBDENUM DISULFIDE
… U=Ud=0. In layered cobalt oxide with additional potassium ions (KnCoO2, n = 1.03), a single extra K atom in the supercell leads to four localized electrons in the band gap, using standard U values, and even for U=Ud=0. Monolayer MoS2 exhibits intriguing properties and potential technological …
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Electrostatic Interactions in the Voltage Sensor of Kv7.1 and Iks Channels
… the heart and the brain. In the heart, IKs potassium channels generate an important repolarizing cardiac current that contributes to the termination of the cardiac action potential. Congenital mutations that disrupt the function of IKs can lead to cardiac arrhythmias and sudden death. The …
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Thermoionization and dissociation of fullerenes and endohedral fullerenes
… energies were found in the formation of potassium metallofullerenes and sodium metallofullerenes. The large thresholds indicate that the alkali metallofullerene products have endohedral structure. Sodium ion implantation into C60 films could be a potential method of producing …
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Water Vapor Sorption by Soy Proteins, Proteinates and Hydrolysates
… was a linear function of the amount of alkali ions added. This indicated the increase in sorption with pH was due to the added ions and not a pH effect. Both sodium and potassium ions were found to sorb less water in the presence of protein than they did alone. This was attributed to ionic …
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