Abstract
The free solution mobilities of small dsDNA and ssDNA oligomers have been measured as a function of ionic strength by capillary electrophoresis. The mobilities of both types of DNA decrease with increasing ionic strength, approaching limiting plateau values at high ionic strengths. The observed mobilities of the dsDNAs are similar to the mobilities calculated from the Manning electrophoresis equation, although the shapes of the mobility curves are different. The observed ssDNA mobilities cannot be described by the Manning electrophoresis equation using a single value of the axial charge spacing.
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