Chemical and biochemical preparations for scientific and research purposes, namely, affinity chromatography chemicals, biomaterials, namely, sepharose, oligosaccharides, polysaccharides, agarose, chitosan, cellulose, rayon, rayon triacetates, cellulose nitrates, cellulose acetates, hydroxyethylcellulose, cellulosebutyrates, celluloseacetatebutyrates, ethylvinylacetate copolymers, polysulphones, exopy resins, silicones, cellulose ethers, cellulose triacetates, carboxymethylcellulose, lipids, c...