Values of as a function of temperature calculated using two different models.

<p>The dotted line represents Eq. (2), which was used in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0072395#pone.0072395-Dick2" target="_blank">[19]</a> to calibrate a model for the relative chemical stabilities of model proteins among sites (“gradient” model). The points connected by the dashed line indicate optimal values of that were derived in the present study by minimization of the Gibbs energy of transformation between the metastable equilibrium relative abundances of model proteins for phyla and the BLAST-derived observed relative abundances of phyla.