d copolymers thereof. [0027] With reference to the polymers of Group 2, polymer 2* may be a polyacid of the group comprising, but not limited to, polycarboxylic acid such as polyacrylic acid, polymethacrylic acid, polyitaconic and polycrotonic acid, polynucleotides such as poly(adenylic acid), poly(cytidylic acid), poly(uridylic acid) and poly(inosinic acid), polymers of vinyl nucleic acids such a