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A random-coil conformation can be detected using spectroscopic techniques. The arrangement of the planar amide bonds results in a distinctive signal in circular dichroism. The chemical shift of amino acids in a random-coil conformation is well known in nuclear magnetic resonance (NMR). Deviations from these signatures often indicates the ...
In the simplest treatment, such a chain follows the random walk model, where each step taken in a random direction is independent of the directions taken in the previous steps, forming a random coil. The average end-to-end distance for a chain satisfying the random walk model is R 2 = N b 2 {\displaystyle \langle R^{2}\rangle =Nb^{2}} .
In statistical mechanics, the Zimm–Bragg model is a helix-coil transition model that describes helix-coil transitions of macromolecules, usually polymer chains. Most models provide a reasonable approximation of the fractional helicity of a given polypeptide; the Zimm–Bragg model differs by incorporating the ease of propagation (self-replication) with respect to nucleation.
In a polymer solution, a theta solvent (or θ solvent) is a solvent in which polymer coils act like ideal chains, assuming exactly their random walk coil dimensions. [ clarification needed ] Therefore, the Mark–Houwink equation exponent is 1 / 2 {\displaystyle 1/2} in a theta solvent.
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An illustration of the WLC model, with position and unit tangent vectors as shown. The WLC model envisions a continuously flexible isotropic rod. [1] [2] [3] This is in contrast to the freely-jointed chain model, which is only flexible between discrete freely hinged segments.
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