Quasiperiodic oscillation and possible Second Law violation in a nanosystem

R. Quick, A. Singharoy, P. Ortoleva

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Simulation of a virus-like particle reveals persistent oscillation about a free-energy minimizing structure. For an icosahedral structure of 12 human papillomavirus (HPV) L1 protein pentamers, the period is about 70 picoseconds and has amplitude of about 4 Å at 300 K and pH 7. The pentamers move radially and out-of-phase with their neighbors. As temperature increases the amplitude and period decrease. Since the dynamics are shown to be friction-dominated and free-energy driven, the oscillations are noninertial. These anomalous oscillations are an apparent violation of the Second Law mediated by fluctuations accompanying nanosystem behavior.

Original languageEnglish (US)
Pages (from-to)61-65
Number of pages5
JournalChemical Physics Letters
StatePublished - May 20 2013
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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