in addition this communication presents data indicating ( 1 ) wide variability in the extent of na+ adsorption among different isolated proteins and even among different samples of the same protein , ( 2 ) auto-cooperativity in the ph titration and na+ adsorption , and ( 3 ) selectivity of the liberated fixed anionic groups for different alkali-metal ions in the rank order na greater than li greater than k greater than rb , cs .
C0003075
anionic
C0022023
ions