Figure 3: Sodium ion binding to KR2. | Nature Communications

Figure 3: Sodium ion binding to KR2.

From: A light-driven sodium ion pump in marine bacteria

Figure 3

(a) Absorption spectra of KR2 in the presence (red) and absence (blue) of 100 mM NaCl. (b) ATF-FTIR difference spectra upon exchange of 50 mM NaCl/KCl (blue), NaCl/RbCl (pink), NaCl/CsCl (purple) and NaCl/NaBr (grey). (c) ATF-FTIR difference spectra for different concentrations of NaCl/KCl. (d) Salt concentration dependence for the peak height at 1553 and 1567, cm−1 in c at pH 8.0 (blue circles) and pH 3.6 (red diamonds).

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