Free intracellular magnesium concentration in ferret ventricular muscle measured with ion selective micro-electrodes.
The free Mg concentration ([Mg]i) was measured in ferret ventricular muscle using single-barrelled Mg-sensitive micro-electrodes. The electrodes were calibrated in solutions containing the [K]i and [Na]i measured in this tissue. In thirteen measurements from seven experiments conforming to strict criteria for calibration and penetration the estimated mean [Mg]i was 0.4 mmol/l. This is to be regarded as an upper limit since it was estimated by linear extrapolation of the calibration curve.
D000818:Animals; D005289:Ferrets / Q000378:metabolism; D008274:Magnesium / Q000032:analysis*; D008564:Membrane Potentials; D008839:Microelectrodes; D009206:Myocardium / Q000032:analysis*
D008274:Magnesium