wlc_marko_siggia_distance¶

lumicks.pylake.wlc_marko_siggia_distance

wlc_marko_siggia_distance(name)¶

Marko Siggia’s Worm-like Chain (WLC) model.

This model [1] is based on only entropic contributions. This model is valid at low forces [2]:

\[F << \frac{1}{4} \left(k_B T S_t^2 / L_p\right)^\frac{1}{3}\]

Where \(k_B\) is the Boltzmann constant, \(T\) is the temperature, \(S_t\) is the stretch modulus and \(L_p\) is the persistence length. At higher forces an extensible WLC model (which takes into account enthalpic stretching) should be used.

This model has distance as the dependent variable. Differs from exact WLC solution by up to -10% near F=0.1 pN. Approaches exact WLC solution at lower and higher forces [2].

Parameters:: name (str) – Name for the model. This name will be prefixed to the model parameter names.

References