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. Author manuscript; available in PMC: 2012 May 23.
Published in final edited form as: J Phys Condens Matter. 2010 Dec 15;22(49):494110. doi: 10.1088/0953-8984/22/49/494110

Table 1.

Comparison of τ-ratios in solutions with different Na+ ion concentrations

τ-ratio1
Buffer cations 207-bp M13 199-bp SV40 335-bp SV40
0.5 mM Tris+ + 0.02 mM Na+ 0.87 0.87 0.87
0.5 mM Tris+ + 0.2 mM Na+ 0.91 0.84 0.99
1

Estimated uncertainty of the τ-ratios is ±0.02