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Dynabeads are superparamagnetic, monosized polymer particles with a consistent, defined surface for the adsorption or coupling of various bioreactive molecules or cells.

They were developed after John Ugelstad managed to create uniform polystyrene spherical beads of exactly the same size,^{[citation needed]} at the University of Trondheim, Norway in 1976, something otherwise only achieved by NASA in the weightless conditions of SkyLab.^{[citation needed]} This discovery revolutionised the separation of many biological materials.^{[citation needed]} The technology behind the beads was licensed to Dyno Industrier in 1980 and this magnetic separation technology has been since used for the isolation and manipulation of biological material, including cells, nucleic acids, proteins and pathogenic microorganisms.^{[citation needed]}