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Epidemiological studies associate low dietary magnesium intake with an increased incidence of ischémie heart disease and sudden cardiac death. We have used proton-magnetic resonance (

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A dynamic, nonequilibrium mechanism is proposed for concentrating both Na+ and K+ in the cell nucleus. The model is consistent with experiment observations and with known properties of cell membranes. This model could explaing the high nucleoplasm to cytoplasm ratios of Na+ and/or K+ reported for liver kidney, thymus, frog skin, ascites cells, and amphibian oocytes.