Struct WormLikeChain 

pub struct WormLikeChain {
    pub persistence_length: f64,
    pub contour_length: f64,
}

Worm-Like Chain (WLC) model — semiflexible polymer.

Described by persistence length lp and contour length lc.

Fields

persistence_length: f64

Persistence length (m).

contour_length: f64

Contour length (m).

Implementations

impl WormLikeChain

pub fn new(lp: f64, lc: f64) -> Self

Create a new WLC model.

pub fn end_to_end_rms(&self) -> f64

RMS end-to-end distance for the WLC: ⟨r²⟩^½ = √(2·lp·lc).

This is the Gaussian limit; always less than contour length.

pub fn force_extension(&self, extension: f64, kt: f64) -> f64

Force at fractional extension r/lc via the Marko-Siggia interpolation.

f = (kT / lp) · [ 1/(4(1−x)²) − 1/4 + x ] where x = extension/lc.

Arguments

• extension – end-to-end distance (m), must be < contour_length.
• kt – thermal energy k_B T (J).

Trait Implementations

impl Clone for WormLikeChain

fn clone(&self) -> WormLikeChain

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WormLikeChain

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.