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Title: Effects of magnesium salt concentrations on B-DNA overstretching transition
Authors: Fu, H. 
Chen, H. 
Koh, C.G. 
Lim, C.T. 
Keywords: 61.25.HM acromolecular polymers solutions; polymer melts
87.15.La Mechanical properties
87.15.Zg Phase transitions
Issue Date: May-2009
Citation: Fu, H., Chen, H., Koh, C.G., Lim, C.T. (2009-05). Effects of magnesium salt concentrations on B-DNA overstretching transition. European Physical Journal E 29 (1) : 45-49. ScholarBank@NUS Repository.
Abstract: In this study, we use optical tweezers to investigate the ionic effects of magnesium salt solutions on the overstretching transition of single B-DNA molecules. The experimental data are compared with those in sodium salt solutions. The overstretching transition force increases when the NaCl or MgCl 2 salt concentration increases. Magnesium cations have much stronger effects on the overstretching transition force than sodium cations. For both NaCl and MgCl 2 salt solutions, the overstretching transition force is linear with the natural logarithm of salt concentration, which confirms the theory proposed in previous paper. The modified ZZO model is applied to study the electrostatic contribution of magnesium salt solutions to the overstretching transition of single B-DNA molecules. The consistency between the experimental data and analytical results shows that the modified ZZO model can simulate the transition behavior of single B-DNA molecules in different NaCl and MgCl 2 salt solutions. © 2009 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
Source Title: European Physical Journal E
ISSN: 12928941
DOI: 10.1140/epje/i2009-10448-0
Appears in Collections:Staff Publications

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