random coil


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ran·dom coil

a structure of a macromolecule (typically, a biopolymer) that changes over time.

random coil

n.
A protein structure characterized by irregular coils or folds.
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Structural assignment (a) Experimental 2[degrees] 3[degrees] technique structure structure SE-HPLC NA (b) Extended, nonglobular Sedimentation equilibrium ultracentrifugation NA NA CD Random coil, no helix NA Structural assignment (a) Experimental 4[degrees] Coiled-coil technique structure SE-HPLC NA NA Sedimentation equilibrium ultracentrifugation Monomer, not trimer No CD NA No (a) 2[degrees] structure refers to helix, [beta]-sheet, or random coil content; 3[degrees] structure refers to the overall three-dimensional shape of the molecule; and 4[degrees] structure refers to the putative state of association of individual molecules.
1] (amide III, C-N stretching), attributed to predominant random coil (water-soluble) form of SF [4-6].
For non-cross-linked films, the SF film exhibited the highest water solubility because of its predominant random coil form.
This may be explained that the CS molecules could act as the rigid mold plates to stretch the SF molecules resulted conformational changes from random coil to [beta]-sheet form [20].
When the temperature is over the melting temperature of UHPE crystals, the macromolecules are subjected to thermal diffusion, accompanied by a conversion of the parallel-extended chains to the interpenetrated random coils and a gradual restoration of the entanglements.
The difference between experimental observation and theory prediction may indicate that the initial state of the melt of the nascent UHPE deviates from the prerequisite of Interpenetrated random coils in the molecular dynamics theory.
During the heating process, the conformation of chains transforms from parallel-extended chains to interpenetrated random coils because of thermal diffusion, and meantime, intermolecular reentangling takes place.
The maximum attainable draw ratio ([lambda]) is assumed to be determined by the ratio of the extended-chain length to the root mean square end-to-end distance of an unperturbed random coil [4-7].
If the random coil is greater than about twice the long period, tie molecules will be formed during crystallization.
In an extensional flow, a random coil can be deformed to a much greater extent.
Other ophio varieties have flower stalks, but they form wild and random coils or broad sweeping curls and arches rather than tight coils.