Oiled coil model

This model is similar to the liquid drop model but regards the tropoelastin monomer as fibrillar. It features a broad coil made up of the repeating tetrapeptide units GVPG in which glycine residues occupy the exterior portions exposed to solvent, while proline, valine, and other hydro-phobic residues are buried. Each monomer is fibrillar, made up of alternating sections of crosslink regions and oiled coils (Gray et al., 1973). The... 

At this temperature, the entropy change for dissolution of liquid hydrocarbons in water is zero. However, the entropy of protein denaturation is far from zero at this temperature but amounts to 17.6 J - K l per mole of amino acid residues (Privalov, 1979), a value that corresponds to an 8-fold increase of the number of possible configurations and is close to the value expected for the helix-coil transition of polypeptides (Schellman, 1955). This difference shows that an oil drop is an inadequate model for a globular protein. A more suitable model resembles that of a small crystal with a quite definite positive melting entropy (see also Bellow, 1977, 1978). 

A viscoelastic substance behaves in both an elastic and viscous manner, as can best be described by the simplified mechanical model shown in Figure 13. The elastic element is represented by a coil and the viscous element by a plunger in oil (Bothner8cWik,1989). 

The model used virgin transformer materials impregnated with chlorobenzenes. The bulk oil was homogenized before samples were taken and the temperature of the tank adjusted to 50 C. Samples of impregnated kraft paper were wound into a coil and immersed in the oil. Several different kinetic runs were made with different thicknesses of paper as well as different numbers of layers forming the overall wad of paper. 

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