1. Coefficient of dissociation of this kind of zwitterion is low, can affect its to organize penetration, but can raise its to be opposite mucous penetration.

2. The zwitterion terpolymers of the invention are made from the terpolymers by internal transfer of the proton of the carboxylic acid to the amino group of the acrylamide or acrylate monomer.

3. The optimum sought super zwitterion polymer drilling liquid is with the aim, practicality, advantage and economy.

4. In this paper the chemical reaction of poly (vinyl pyridine) was studied and the polyelectrolytes CAPVP containing zwitterion structure units were synthesized.

5. Ab initio calculations have been performed for both the neutral form and zwitterion of imidazol1ylacetic acid in the gas phase and in aqueous solution(using SCRF model).

6. The cysteine in the clay mineral existed in the forms of zwitterion and anion, the O and S in it chelated zinc cation to form configuration of hexatomic ring.