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. 1997 Jun 10;94(12):6185–6190. doi: 10.1073/pnas.94.12.6185

Table 2.

Effect of multivalent cations on the persistence length and elastic modulus

Solution condition Inextensible WLC P, Å Strong-stretching limit P, Å Extensible WLC
P, Å S, pN
BB 963  ±  48 862  ±  49 949  ±  59 649  ±  82
100 μM Mg2+ + BB 409  ±  37 455  ±  74 508  ±  103 957  ±  203
100 μM Put2+ + BB 581  ±  48 560  ±  19 684  ±  31 945  ±  68
200 μM Put2+ + BB 329  ±  20 341  ±  6 309  ±  31 1,094  ±  360
25 μM Spd3+ + BB 320  ±  18 368  ±  75 419  ±  47 1,006  ±  193
100 μM Spd3+ + BB 440  ±  13 375  ±  44 463  ±  65 1,175  ±  141
2 μM Co(NH3)63+ + BB 407  ±  48 476  ±  126 422  ±  1 696  ±  183
5 μM Co(NH3)63+ + BB 243  ±  18 382  ±  101 352  ±  32 1,144  ±  134
25 μM Co(NH3)63+ + BB 299  ±  21 177  ±  30 265  ±  46 1,010  ±  229

Results are reported as the mean ± standard error, n ≥ 3. Put, putrescine; Spd, spermidine.