Potassium Leakage
Mostrando 1-12 de 51 artigos, teses e dissertações.
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1. Influence of carvacrol and thymol on the physiological attributes, enterotoxin production and surface characteristics of Staphylococcus aureus strains isolated from foods
This study evaluated the influence of the phenolic compounds carvacrol (CAR) and thymol (THY) on some physiological characteristics and on the modulation of the secretion of some staphylococcal virulence factors, that is, coagulase and enterotoxin. This study also investigated possible mechanisms for the establishment of the anti-staphylococcal activity of t
Braz. J. Microbiol.. Publicado em: 19/03/2013
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2. DETERMINAÇÃO DO POTENCIAL FISIOLÓGICO DE SEMENTES DE ARROZ BASEADO NA INTEGRIDADE DAS MEMBRANAS CELULARES / DETERMINATION OF PHYSIOLOGICAL POTENTIAL OF SEEDS OF RICE BASED CELLULAR INTEGRITY OF MEMBRANES
Procedimentos adequados para avaliar a qualidade de sementes embora de fundamental importância ainda são incompletos nos programas de controle de qualidade. O trabalho teve como objetivo estabelecer a metodologia do teste de condutividade elétrica massal e individual e do teste de lixiviação de potássio para a avaliação do vigor de sementes de arroz.
Publicado em: 2011
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3. Avaliação do potencial fisiológico e métodos de condicionamento, secagem e armazenamento de sementes de pepino / Evaluation of the physiological potential and priming, drying and storage of cucumber seeds
The objectives of this research were to identify reliable methods to evaluate the physiological potential of cucumber seeds, verify the relationship between seed physiological potential and field performance, as well as to define a suitable procedures for seed priming, drying and storage. The study was conducted in two experimental phases using seed lots of
Publicado em: 2008
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4. Pea seed pre hydration and its interference with the evaluation of the physiological potential / Pré-hidratação de sementes de ervilha e sua interferência na avaliação do potencial fisiológico
The present work had the objective of to study biochemical and physiological alterations in function of pea seed pre hydration with e phasis in the electrolyte leakage and in the expression of different isoenzymatic systems,trying to contribute for the i provement of the pre hydration methods of seeds to be submitted to tests for evaluation of its physiologi
Publicado em: 2007
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5. Métodos para avaliação do potencial fisiológico de sementes de melão. / Methods for the physiological potential evaluation in melon seeds.
This research was conducted to study and select procedures for the controlled deterioration, accelerate aging, electrical conductivity and potassium lixiviation tests, to verify their sensitivity to identify different vigor levels of melon (Cucumis melo L.) seed lots. Five seed lots each from the hybrids AF-646 and AF-682 were used. In the first experimental
Publicado em: 2002
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6. Amphotericin B and Filipin Effects on L and HeLa Cells: Dose Response
Amphotericin B (AmB) and filipin effects on L and HeLa cells were compared by monitoring drug-induced potassium leakage from cells, changes in radioactive uridine incorporation into cellular ribonucleic acid, protein leakage from cells, and cell viability. L cells were much more susceptible to both AmB and filipin than were HeLa cells, but the overall dose r
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7. Carrier-mediated Potassium Efflux Across the Cell Membrane of Red Beet
The flux ratio (influx/efflux) of K+ across the plasmalemma of beet cells at an external potassium concentration of 0.6 mm does not respond to changes of membrane potential in the manner expected for the free diffusion of ions. The K+ efflux is affected by the presence of adsorbed Ca2+, but is apparently unrelated to the electrical potential or to the net up
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8. Cation Fluxes and Permeability Changes Accompanying Bacteriophage Infection of Escherichia coli
Infection of Escherichia coli by bacteriophage T2 was accompanied by a rapid but transient increase in the rate of loss of small molecules from the bacterial cells. This transient leakage was studied with radioactive labels such as 42K and 28Mg. Bacteriophage-induced leakage was dependent on the ratio of phage to bacteria: the higher the multiplicity of infe
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9. Effects of free and liposomal amphotericin B and gramicidin S alone and in combination on potassium leakage from human erythrocytes and Candida albicans.
We studied the toxic effects of amphotericin B and gramicidin S, alone and in combination, using free and liposome-encapsulated drugs. In vitro toxic effects of the drugs on human erythrocytes and Candida albicans were determined by measuring leakage of intracellular potassium ions (K+). Liposomal formulations of both drugs greatly reduced K+ leakage from hu
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10. The effect of minocycline on potassium leakage from red cells: a study of the genetics and relationship to vestibular adverse reactions
Minocycline causes an increased leakage of potassium from erthrocytes. This effect has been quantified and found to be highly repeatable but highly variable between subjects. The variability in the population is unimodal. Random family studies show no correlation between spouses and the heritability is 0·63. The in vitro minocycline effect in 11 subjects wh
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11. Mechanism of Action of Phenethyl Alcohol: Breakdown of the Cellular Permeability Barrier
Phenethyl alcohol (PEA) caused Escherichia coli to take up greatly increased amounts of acriflavine, a compound to which healthy growing cells are impermeable. PEA also caused an increased rate of efflux (leakage) of cellular potassium under conditions which do not greatly alter the influx of potassium via the energy-dependent potassium pump. We therefore pr
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12. Action of Steroidal Diamines on Active Transport and Permeability Properties of Escherichia coli
The steroidal diamine irehdiamine A (IDA) is a potent inhibitor of bacteriophage growth and macromolecular synthesis in Escherichia coli. By using radioactive 42K and 14C-thiomethylgalactoside (TMG), rapid effects of IDA and related steroids, both on the influx of potassium and TMG via their respective transport systems and on the efflux (leakage) of radioac