| Citation | Distinguished for the discovery of slowly activated potassium currents in the heart and a quantitative analysis of their role in controlling repolarization and pacemaker activity; the discovery of the ionic mechanisms by which adrenaline increases heart rate. He has shown that therapeutic levels of cardiac glycosides may increase, rather than decrease, potassium gradients in the heart, and has published an analytical treatment of membrane excitation theory and cable theory that provides a modern basis for the concepts of safety factor, liminal length, excitation time constants and the phenomenon of repetitive firing. |