Before 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.
After revision: Superparamagnetic microbeads: the monosized Dynabeads (scanning electron microscope image) Microbeads, also called Ugelstad particles after the Norwegian chemical engineer , 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.