. . . . . . "Macromol. 1994; 16:343)], alginates, hyaluronic acid, chitin or chitosans and other polysaccharides, such as e.g. Sephadex???, Sephacryl???, Sepharose??? and Superdex???, synthetic polymers, such as e.g. polyamides, polyesters, polyolefins, polyacrylates, polyvinyl alcohols, polyurethanes and silicones, including mixtures and copolymers thereof, into which various functional groups, such as e.g. h" . . . . .