A particle (and a composition that includes a plurality of the particles) that includes at least one polypeptide molecule and at least one polymer covalently bound to the polypeptide molecule so as to form a polymer shell substantially encompassing the polypeptide molecule, wherein the particle does not define a dimension greater than about 1 .mu.m. One example for making the particle includes modifying the polypeptide molecule to provide .alpha., .beta.-ethylenically unsaturated terminal functional groups, mixing the modified polypeptide molecule with a silicon-containing polymerizable compound, and subjecting the resulting mixture to conditions sufficient for polymerizing the polymerizable compound to form the particle.
STATEMENT OF GOVERNMENT SUPPORT
This invention was made with United States Government support under Contract DE-AC06-76RL01830 awarded by the U.S. Department of Energy. The United States Government has certain rights in the invention.