A macro-ion of a @AT07196@ (in particular a protein) is said to be isoelectric if it exhibits no @E02022@.
Source: PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 618 [Terms] [Paper]