Rice potassium transporter OsHAK1 is essential for maintaining potassium-mediated growth and functions in salt tolerance over low and high potassium concentration ranges

2015 ◽  
Vol 38 (12) ◽  
pp. 2747-2765 ◽  
Author(s):  
Guang Chen ◽  
Qingdi Hu ◽  
Le Luo ◽  
Tianyuan Yang ◽  
Song Zhang ◽  
...  
Keyword(s):  
Salt Tolerance ◽  
Potassium Concentration ◽  
High Potassium ◽  
Potassium Transporter ◽  
High Potassium Concentration

Movement of Aldolase From Excised Rat Diaphragm

1956 ◽  
Vol 185 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Kenneth L. Zierler
Keyword(s):  
Aqueous Solution ◽  
Cell Membrane ◽  
Potassium Concentration ◽  
Fiber Surface ◽  
Rat Diaphragm ◽  
High Potassium ◽  
Flow Through ◽  
High Potassium Concentration

A protein, aldolase, flows from excised rat diaphragm incubated in a variety of media. The rate of outflow of aldolase is increased by anoxia and by a high potassium concentration in the medium, and it is decreased by a reduction in temperature and by addition of glucose. When diaphragm is transferred to fresh media and reincubated the rate of outflow of aldolase is also accelerated. From measurements of rates of outflow of aldolase, estimates have been made of the area of the membrane required for aldolase to flow through the cell membrane as though it were flowing simply through an aqueous solution. This area is about 10–7–10–8 of the estimated total fiber surface. The estimated area for diffusion of aldolase is modified 16-fold by factors which alter the metabolism of diaphragm.

Protection of atrial function in hypoxia by high potassium concentration

1994 ◽  
Vol 25 (3) ◽  
pp. 401-407 ◽  
Author(s):  
Guglielmina Froldi ◽  
Luisa Pandolfo ◽  
Alessandro Chinellato ◽  
Eugenio Ragazzi ◽  
Laura Caparrotta ◽  
...  
Keyword(s):  
Potassium Concentration ◽  
Atrial Function ◽  
High Potassium ◽  
High Potassium Concentration

scholarly journals INFLUENCE OF EXTERNAL POTASSIUM ON THE SYNTHESIS AND DEPOSITION OF MATRIX COMPONENTS BY CHONDROCYTES IN VITRO

1974 ◽  
Vol 63 (3) ◽  
pp. 843-854 ◽  
Author(s):  
Jon C. Daniel ◽  
Robert A. Kosher ◽  
James E. Hamos ◽  
James W. Lash
Keyword(s):  
Culture Medium ◽  
Hyaline Cartilage ◽  
Cell Layer ◽  
Potassium Concentration ◽  
Cartilage Matrix ◽  
High Potassium ◽  
External Potassium ◽  
Matrix Components ◽  
High Potassium Concentration

The effect of a high external potassium concentration on the synthesis and deposition of matrix components by chondrocytes in cell culture was determined. There is a twofold increase in the amount of chondroitin 4- and 6-sulfate accumulated by chondrocytes grown in medium containing a high potassium concentration. There is also a comparable increase in the production of other sulfated glycosaminoglycans (GAG) including heparan sulfate and uncharacterized glycoprotein components. The twofold greater accumulation of GAG in the high potassium medium is primarily the result of a decrease in their rate of degradation. In spite of this increased accumulation of GAG, the cells in high potassium fail to elaborate appreciable quantities of visible matrix, although they do retain the typical chondrocytic polygonal morphology. Although most of the products are secreted into the culture medium in the high potassium environment, the cell layer retains the same amount of glycosaminoglycan as the control cultures. The inability of chondrocytes grown in high potassium to elaborate the typical hyaline cartilage matrix is not a consequence of an impairment in collagen synthesis, since there is no difference in the total amount of collagen synthesized by high potassium or control cultures. There is, however, a slight increase in the proportion of collagen that is secreted into the medium by chondrocytes in high potassium. Synthesis of the predominant cartilage matrix molecules is not sufficient in itself to ensure that these molecules will be assembled into a hyaline matrix.

scholarly journals Rapid adaptation to elevated extracellular potassium in the pyloric circuit of the crab, Cancer borealis

2020 ◽  
Vol 123 (5) ◽  
pp. 2075-2089 ◽  
Author(s):  
Lily S. He ◽  
Mara C.P. Rue ◽  
Ekaterina O. Morozova ◽  
Daniel J. Powell ◽  
Eric J. James ◽  
...  
Keyword(s):  
Potassium Concentration ◽  
Fold Increase ◽  
Stomatogastric Ganglion ◽  
Extracellular Potassium ◽  
Rapid Adaptation ◽  
Cancer Borealis ◽  
High Potassium ◽  
Transient Loss ◽  
High Potassium Concentration ◽  
Nonstationary Effects

Solutions with elevated extracellular potassium are commonly used as a depolarizing stimulus. We studied the effects of high potassium concentration ([K+]) on the pyloric circuit of the crab stomatogastric ganglion. A 2.5-fold increase in extracellular [K+] caused a transient loss of activity that was not due to depolarization block, followed by a rapid increase in excitability and recovery of spiking within minutes. This suggests that changing extracellular potassium can have complex and nonstationary effects on neuronal circuits.

Effect of Adrenergic Drugs on the Lantern of the Larval PHOTURIS FIREFLY

1968 ◽  
Vol 48 (2) ◽  
pp. 381-387
Author(s):  
ALBERT D. CALRLSON
Keyword(s):  
Potassium Concentration ◽  
Choline Chloride ◽  
High Potassium ◽  
Adrenergic Drugs ◽  
Significant Difference ◽  
Receptor Interactions ◽  
Intense Luminescence ◽  
Drug Receptor ◽  
High Potassium Concentration ◽  
Sodium And Potassium

1. A number of adrenergic drugs were tested for their ability to induce luminescence in the extirpated lantern of the firefly larva. The drugs produce sigmoid doseresponse curves characteristic of drug-receptor interactions when drug concentration is plotted against either maximum intensity or maximum rate of intensity rise. 2. Amphetamine and saline of high potassium concentration induce intense luminescence in freshly extirpated lanterns but act only weakly or not at all in lanterns suffering from treatment by reserpine injection 48 hr. previously. 3. No significant difference in response to norepinephrine was observed in lanterns immersed in standard saline, 0.32 M sucrose, 0.16 M choline chloride or 0.16 M-NaCl2 but 0.107 M-CaCl2 considerably slowed the response. 4. Some generalizations concerning structural character and effectiveness in inducing luminescence were made by comparing the drugs tested. It was not possible to describe the mode of action of the drugs. The observation, however, that solutions lacking sodium and potassium did not significantly alter the response was felt to argue against the action of the adrenergic drugs in affecting ion movement across the photocyte membrane.

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