Cell Ion Leakage
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Conservação pós-colheita, sintomas e respostas fisiológicas da senescência e injúria por frio em hastes de Heliconia bihai (L.)
As flores tropicais de corte, após a colheita, podem estar sujeitas a temperaturas inadequadas,principalmente durante a comercialização, o que pode acelerar o processo de senescência e causar injúria por frio, cujos sintomas ainda não foram descritos. A conservação pós-colheita adequada das hastes florais de helicônia é importante para o sucesso d
Publicado em: 2009
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2. Ozone-induced Loss of Intracellular Potassium Ion from Chlorella sorokiniana12
The unicellular algae Chlorella sorokiniana was used as a model system to investigate the interaction of ozone with plant cell membranes. Ozone induces K+ leakage from Chlorella sorokiniana similar to the electrolytic loss observed from many higher plants under stressful conditions. The kinetics of this leakage indicate that ozone initially interacts reversi
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3. Loss of Inorganic Ions from Host Cells Infected with Chlamydia psittaci
Mouse fibroblasts (L cells) infected with the 6BC strain of Chlamydia psittaci released potassium ion (K+) into the extracellular milieu in a way that depended on size of inoculum and time after infection. When the multiplicity of infection was 500 to 1,000 50% infectious units (ID50) per L cell, loss of intracellular K+ was first apparent 4 to 10 h after in
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4. 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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5. Ions required for the electrogenic transport of GABA by horizontal cells of the catfish retina.
1. Solitary horizontal cells were isolated from catfish retinas. Membrane currents activated by extracellular and intracellular GABA were characterized during a whole-cell voltage clamp. 2. Extracellular GABA activated two currents: a GABAA current, and an 'influx' current mediated by a GABA transporter. The influx current was studied after the GABAA current
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6. Uptake and accumulation of putrescine and its lethality in Anacystis nidulans.
The rate of uptake of putrescine by Anacystis nidulans has been shown to depend on the external pH and the extracellular concentration of putrescine. Accumulation of exogenous putrescine was also proportional to the concentration of putrescine in the medium, suggesting that putrescine uptake was not subject to cellular regulation. An equation was derived to
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7. Mycoplasma pulmonis Inhibits Electrogenic Ion Transport across Murine Tracheal Epithelial Cell Monolayers
Murine chronic respiratory disease is characterized by persistent colonization of tracheal and bronchial epithelial cell surfaces by Mycoplasma pulmonis, submucosal and intraluminal immune and inflammatory cells, and altered airway activity. To determine the direct effect of M. pulmonis upon transepithelial ion transport in the absence of immune and inflamma
American Society for Microbiology.
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8. Relative Sensitivity of Photosynthesis and Respiration to Freeze-Thaw Stress in Herbaceous Species 1: Importance of Realistic Freeze-Thaw Protocols
The relative effect of a freeze-thaw cycle on photosynthesis, respiration, and ion leakage of potato leaf tissue was examined in two potato species, Solanum acaule Bitt. and Solanum commersonii Dun. Photosynthesis was found to be much more sensitive to freezing stress than was respiration, and demonstrated more than a 60% inhibition before any impairment of
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9. Misfolded Amyloid Ion Channels Present Mobile β-Sheet Subunits in Contrast to Conventional Ion Channels
In Alzheimer's disease, calcium permeability through cellular membranes appears to underlie neuronal cell death. It is increasingly accepted that calcium permeability involves toxic ion channels. We modeled Alzheimer's disease ion channels of different sizes (12-mer to 36-mer) in the lipid bilayer using molecular dynamics simulations. Our Aβ channels consis
The Biophysical Society.
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10. Tomato Fruit Carboxypeptidase (Properties, Induction upon Wounding, and Immunocytochemical Localization).
Carboxypeptidase activity was characterized during ripening and wounding of tomato (Lycopersicon esculentum) fruit. The fruit enzyme shares substrate specificity and susceptibility to the inhibitors diisopropyl fluorophosphate and phenylmethylsulfonyl fluoride with other plant carboxypeptidases. The abundance and stability of wound-induced carboxypeptidase w
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11. RIN13 Is a Positive Regulator of the Plant Disease Resistance Protein RPM1W⃞
The RPM1 protein confers resistance to Pseudomonas syringae pv tomato DC3000 expressing either of the Type III effector proteins AvrRpm1 or AvrB. Here, we describe the isolation and functional characterization of RPM1 Interacting Protein 13 (RIN13), a resistance protein interactor shown to positively enhance resistance function. Ectopic expression of RIN13 (
American Society of Plant Biologists.
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12. Cell Vacuolation Caused by Vibrio cholerae Hemolysin
Non-O1 strains of Vibrio cholerae implicated in gastroenteritis and diarrhea generally lack virulence determinants such as cholera toxin that are characteristic of epidemic strains; the factors that contribute to their virulence are not understood. Here we report that at least one-third of diarrhea-associated nonepidemic V. cholerae strains from Mexico cause
American Society for Microbiology.