The concentration of ionized magnesium in barnacle muscle fibres.

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Abstract
Total Mg in isolated fibers of Balanus aquila was 10.5 mmol/kg wet wt. Intracellular free Mg was measured by a null point method using eriochrome blue as an indicator of free Mg, and internal dialysis with solutions of varying ionized Mg concentrations. The results indicated a free Mg of 6 mM or 4.2 mmol/kg wet wt in the intracellular water immediately surrounding the dialysis capillary. ATP concentration was 4.9 mmol/kg wet wt. A tentative partitioning of Mg among various intracellular constituents based on present data combined with published work by others is (mmol/kg wet wt): free, 4.2; MgATP, 4.2; myofibrillar bound, 1; residual (presumably bound to arginine phosphate and phosphate) .apprx. 1.