Abstract
We have studied the collapse transition of a single homopolymer chain with “multicanonical Monte Carlo simulation”. As a chain becomes stiffer, the manner of the transition changes from continuous to discontinuous. In addition to this, it is found that the morphology in the collapsed state changes from the state only with spherical globule, through the coexistence of both rod and toroidal morphology, into the state only with toroid. The morphological change obtained thus theoretically reproduces the essential features in the experimental collapsed structures from single duplex DNA chains observed with electron microscopy.
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