Schematic of the elemental impedance. The left-hand side is the selection of the interacting amino acids (nodes) within a distance smaller than the interaction radius, RC. The right-hand side is the schematic view of the elementary RC impedance replacing one link between the α-carbon atoms of the i-th and j-th amino acids when their distance li,j is smaller than RC.
Reggiani et al. Nanoscale Research Letters 2012 7:340 doi:10.1186/1556-276X-7-340