The binary diffusion coefficient of moderately dense gas mixtures

Wakeham, W. A.

doi:10.1088/0022-3700/6/2/020

Cited by 16 publications

(4 citation statements)

References 15 publications

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“…(Note that comparable values for ρ f and ρ d were also suggested in ref .) Taking into account the results of ref , the diffusion coefficients in the ipw and the opw were assumed to be related as D iw ρ f = D ow ρ u . Because of the lack of reliable data on the diffusion coefficient of a residue in a protein chain, D iw was assumed to vary between 10 -6 and 10 -8 cm 2 /s.…”

Section: Numerical Evaluationsmentioning

confidence: 85%

Model for the Nucleation Mechanism of Protein Folding

Djikaev

Ruckenstein

2007

J. Phys. Chem. B

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A nucleation-like pathway of protein folding involves the formation of a cluster containing native residues that grows by including residues from the unfolded part of the protein. This pathway is examined by using a heteropolymer as a protein model. The model heteropolymer consists of hydrophobic and hydrophilic beads with fixed bond lengths and bond angles. The total energy of the heteropolymer is determined by the pairwise repulsive/attractive interactions between nonlinked beads and by the contribution from the dihedral angles involved. The parameters of these interactions can be rigorously defined, unlike the ill-defined surface tension of a cluster of protein residues that constitutes the basis of a previous nucleation model. The main idea underlying the new model consists of averaging the dihedral potential of a selected residue over all possible configurations of all neighboring residues along the protein chain. The resulting average dihedral potential depends on the distance between the selected residue and the cluster center. Its combination with the average pairwise potential of the selected residue and with a confining potential caused by the bonds between the residues leads to an overall potential around the cluster that has a double-well shape. Residues in the inner (closer to the cluster) well are considered as belonging to the folded cluster, whereas those in the outer well are treated as belonging to the unfolded part of the protein. Transitions of residues from the inner well into the outer one and vice versa are considered as elementary emission and absorption events, respectively. The double-well character of the potential well around the cluster allows one to determine the rates of both emission and absorption of residues by the cluster using a first passage time analysis. Once these rates are found as functions of the cluster size, one can develop a self-consistent kinetic theory for the nucleation mechanism of folding of a protein. The model allows one to evaluate the size of the nucleus and the protein folding time. The latter is evaluated as the sum of the times necessary for the first nucleation event to occur and for the nucleus to grow to the maximum size (of the folded protein). Depending on the diffusion coefficients of the native residues in the range from 10(-6) to 10(-8) cm2/s, numerical calculations for a protein of 2500 residues suggest that the folding time ranges from several seconds to several hundreds of seconds.

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Section: Numerical Evaluationsmentioning

confidence: 85%

Model for the Nucleation Mechanism of Protein Folding

Djikaev

Ruckenstein

2007

J. Phys. Chem. B

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“…Taking into account the results of Ref. [67,68], the diffusion coefficients in the i.p.w. and the o.p.w.…”

Section: Results For Protein Unfoldingmentioning

confidence: 99%

A probabilistic approach to the effect of water hydrogen bonds on the kinetics of protein folding and protein denaturation

Djikaev

Ruckenstein

2010

Advances in Colloid and Interface Science

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“…where D ij , i, j ∈ S, i = j, are the species binary diffusion coefficients. Different expressions have been proposed in the literature for evaluating high pressure binary diffusion coefficients D ij , i, j ∈ S, i = j, notably by Wakeham [59], Takahashi [60], Harstad and Bellan [61], Leahy-Dios and Firoozbadi [62], and Matsuyama et al [15]. The correlations of Takahashi have been used in particular by Ribert et al [3], Pons et al [4], Oefelein [10], and Zong and Yang [12].…”

Section: High Pressure Transport Coefficientsmentioning

confidence: 99%