suspension polymerization of acrolein type compounds in the presence of appropriate surfactants results in the formation of microspheres in size ranging from 0 . 03μ to 80μ . fluorescent and magnetic microspheres are obtained by carrying out the same polymerization in the presence of appropriate fluorochromic or ferrofluidic compounds , respectively . hybrido polyacrolein microspheres are obtained by grafting one type of such microspheres on another type . immunomicrospheres were formed by binding covalently at physiological ph appropriate proteins to the microspheres . the immunomicrospheres can be used for various biological applications , such as specific markers for labelling cell surface receptors , for cell separation , for diagnostic purposes , etc .