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“At 37 degrees C, reversible displacement of rubidium ions by calcium ions is followed by an irreversible thermal inactivation of rubidium occlusion.”
“ Calcium ions have been shown to compete with two rubidium ions for occlusion sites on 19-kDa membranes, with a high affinity (KD approximately 2.8 microM, pH 7.5, 20 degrees C).”
The Journal of biological chemistry • 1994 | View Paper
“Sodium, potassium, magnesium and calcium generally associated with the isolated microsomes decreased concomitantly with increasing bound rubidium or cesium, demonstrating the ion exchange nature of the binding.”