We then show that in a stochastic regime, drift can counteract this dampening and maintain the oscillations.
Faced with the regime's drift towards lawlessness, the opposition's response should be to redouble its commitment to the rule of law.
But the case does shine an uncomfortable spotlight not only on the heavy-handed tactics of a close ally but also, ultimately, on the Mubarak regime's drift from its early promises of democracy and economic reform to a status-quo autocracy concerned mostly with maintaining its grip on power.
We have shown in this work that such a type of selection pressure can directly influence rates of protein evolution, estimated by d N/d S and distinguish regimes of neutral drift (high stability) from regimes of selection (low stability).
Evolutionary histories can vary among lineages for reasons other than divergent selection regimes, including genetic drift (Fisher 1930; Lande 1981), founder effects (Mayr 1942; Nei et al. 1975), and mutation-order selection (Mani and Clarke 1990; Rundell and Price 2009; Schluter 2009).
For the same activity regime, the lowest drift in IF IF was nevertheless at least twice as large compared to the largest drift observed in IF RES networks (data not shown).
Gene flow has occurred to and from other such populations enabling introduction of new adaptive variation and potentially both enhancing and limiting local adaptation, depending on local selection regimes and migration-drift-selection equilibrium [ 24, 25].
Intuitively, an increase in resonance frequency for more depolarized regimes should lead to drift in oscillation frequency of the network due to drift in resonance frequency.
Some theories relate the turbulence directly to turbulence in the solar wind, and others associate it with structures of magnetospheric origin, suggesting that it can be a consequence of a strong shear flow regime, of a strong gradient drift and/or of a current convective regime (Kintner and Seyler 1985).
The results of the simulation have shown the transport regime in the drifts depends on the efficiency of the seals.
