The cause of the cell-to-medium electrical potentials of plant and animal cells is incompletely understood. In some cases, the potentials appear to be diffusion potentials in which potassium ions play a major role (3,7.) This is indicated A) by potentials which are close to the Nernst potentials for potassium and B) by cell-to-medium potentials which become markedly less negative when the exter...

Binding of the dihydropyridine calcium antagonist [3H]nitrendipine was studied in cardiac myocytes incubated in normal and high potassium buffer so that we might examine the voltage dependence of dihydropyridine binding. Hearts were obtained from adult male Wistar rats, and isolated calcium tolerant myocytes were dissociated by enzymatic dispersion. Cells in 5.6 mM extracellular potassium showe...

BACKGROUND Oral sodium phosphate is currently used for colon preparation prior to colonoscopy or barium enema. Sodium phosphate induces hyperphosphatemia, hypocalcemia, and hypokalemia. Elderly patients are at an increased risk for phosphate intoxication due to decreased glomerular filtration rate, medication use, and systemic and gastrointestinal diseases. We investigated these electrolyte dis...

1. The relations between the concentration of plasma uric acid and urinary excretion of aldosterone, sodium and potassium, were studied in ten healthy males on a diet containing 160 mmol of sodium and 90 mmol of potassium per day. 2. Plasma uric acid correlated positively with aldosterone excretion and this correlation was statistically independent of sodium and potassium excretion. 3. Plasma u...

The influence of potassium deficiency on myocardial H-digoxin concentration in the mouse was studied. Tritiated digoxin, 400 /Ag/kg, was injected intraperitoneally into mice, which were killed at varying time intervals, and the "H-digoxin was extracted. One-half of the mice were made potassium deficient by a diet free of potassium. In control animals, myocardial H-digoxin was maximal by 30 min ...

The influence of potassium deficiency on myocardial H-digoxin concentration in the mouse was studied. Tritiated digoxin, 400 /Ag/kg, was injected intraperitoneally into mice, which were killed at varying time intervals, and the "H-digoxin was extracted. One-half of the mice were made potassium deficient by a diet free of potassium. In control animals, myocardial H-digoxin was maximal by 30 min ...

Xylem hydraulic conductance varies in response to changes in sap solute content, and in particular of potassium (K(+)) ion concentration. This phenomenon, known as the 'ionic effect', is enhanced in embolized stems, where it can compensate for cavitation-induced loss of hydraulic conductance. Previous studies have shown that in well-watered laurel plants (Laurus nobilis L.), potassium concentra...

1. The "chloride space" in frog skin was determined and found to be 69.7 per cent by weight of wet skin. The chloride space occupies about 94 per cent of the total water space of skin. From this and other information, it appears that the "non-chloride space" measures only a part of the space occupied by the structural elements of skin. This space is referred to here as the intracellular compart...

A serious hazard to patients during orthotopic liver transplantation is hyperkalemia. Although the most frequent and hazardous hyperkalemia occurs immediately after reperfusion of the newly transplanted liver, morbid hyperkalemia could happen in the other phases during orthotopic liver transplantation. However, pre-anhepatic hyperkalemia during orthotopic liver transplantation is rare. This rep...