In a “normal” electrocardiogram (ECG), the transition of the QRS axis in the precordial leads occurs between leads V 3 and V 4 (i.e., there is a dominant S in V 3 and a dominant R in V 4).
The scanning tunnelling microscope (STM) is a useful tool for probing the rotation of molecules on surfaces at the single-molecule level 21,22,23,24,25,26,27,28,29. Our STM experiments were performed ...
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