(color online) DNA molecule electrophoresis’ mobility μ as a function of the spermine concentration with trivalents permidine. (a) DLS measurements for 0, 0.25 mM, 0.5 mM of spermidine (black, red, green); (b) SME measurements for 0, 0.25 mM, 0.5 mM of spermidine (black, red, green). The arrows indicate increasing concentration of the spermidine.