Patent 6855551 was granted and assigned to Massachusetts Institute of Technology on February, 2005 by the United States Patent and Trademark Office.
The present invention provides a composition comprising fluorescent semiconductor nanocrystals associated to a compound, wherein the nanocrystals have a characteristic spectral emission, wherein said spectral emission is tunable to a desired wavelength by controlling the size of the nanocrystal, and wherein said emission provides information about a biological state or event.