Skip to main content
. 2004 May 17;142(3):501–508. doi: 10.1038/sj.bjp.0705788

Figure 1.

Figure 1

Chemical structures of the organic cations used in this study to replace sodium. NMDG (pka=9.5) and Tris (pka=8.3) are positively charged at physiological pH. The ion diameters (Angstrom units, three dimensions) are as follows: sodium 1.924, 1.924 and 1.924; choline 7.487, 5.020 and 4.488; guanidinium 6.498, 4.952 and 3.103; NMDG 13.056, 5.582 and 5.332; TEA 8.431, 6.358 and 5.841; TMA 5.291, 4.824 and 4.556; and Tris 7.644, 5.712 and 4.491. The values for lithium are 1.198, 1.198 and 1.198.