Date of download: 10/10/2017 Copyright © ASME. All rights reserved. From: A First Model of the Dynamics of the Bacteriophage T4 Injection Machinery J. Comput. Nonlinear Dynam. 2016;11(4):041026-041026-8. doi:10.1115/1.4033554 Figure Legend: (a) Strain, kinetic, and total mechanical energies of a nanoscale protein spring. Phase 1: Stretching phase with prescribed velocity of free end. Phase 2: Free vibration phase following the release of the free end. Energy is reported in the units of kT, where k is the Boltzmann constant and T is the temperature (Kelvin), and time is reported in the units of nanoseconds. (b) Power spectrum of the strain energy of the nanoscale protein spring. Illustrated peak locates natural frequency of fundamental vibration mode.