Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Cumulative number of sodium ions as a function of the distance from any C1′ DNA atom for each simulation. From the top line down, the Na+ (solid line), 50%-PEI(20) (dotted line), PEI(20) (short dashes), PLL (dots-dashes), and 50%-PEI(40) (long dashes) systems are shown.
