Wednesday, December 5, 2012

1212.0348 (Viktoria Blavatska et al.)

Conformational transitions in random heteropolymer models    [PDF]

Viktoria Blavatska, Wolfhard Janke
We study the conformational transitions in heteropolymers within the frames of a lattice model containing two types of monomers A and B. Such a model can describe in particular the sequences of hydrophobic and hydrophilic residues in proteins (K.F. Lau and K.A. Dill, Macromolecules 22, 3986 (1989)) and polyampholytes with oppositely charged groups (Y. Kantor and M. Kardar, Europhys. Lett. 28, 169 (1994)). We generalize this lattice model by introducing various types of short-range monomer-monomer interactions. Applying the pruned-enriched Rosenbluth chain-growth algorithm (PERM) we analyze numerically the peculiarities of transitions from extended into compact states as function of the fraction of $A$ and $B$ monomers along the heteropolymer chain.
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