Before revision: Superparamagnetic microbeads: the monosized Dynabeads (scanning electron microscope image) Microbeads, also called Ugelstad particles after the Norwegian chemist, professor Dr. John Ugelstad, who invented them in 1977 and patented the method in 1978,Rangnes 1997:4–5 are uniform polymer particles, typically 0.5 to 500 micrometres in diameter.
After revision: Superparamagnetic microbeads: the monosized Dynabeads (scanning electron microscope image) Microbeads, also called Ugelstad particles after the Norwegian chemist, professor John Ugelstad, who invented them in 1977 and patented the method in 1978,Rangnes 1997:4–5 are uniform polymer particles, typically 0.5 to 500 micrometres in diameter.