The present invention relates to the use of certain microspheres,
nanospheres, and other structures to provide a method of marking or
masking identifying marks in individual biological hosts. Biological
hosts for the present invention may include humans, other animals, or
plants. Such methods may be used to sense, signal, track, mark, or
identify individual biological hosts. Microspheres, nanospheres, and
other structures of the present invention may be implanted, injected,
ingested, or attached to individual biological hosts. Microspheres,
nanospheres, and other structures of the present invention comprise
poly[bis(trifluoroethoxy)phosphazene] and/or a derivative thereof which
may be present throughout the particles or within an outer coating of the
particles. The microspheres, nanospheres, and other structures may also
comprise a core having a hydrogel which may further comprise one or more
dyes or other chromophoric agents covalently bound permanently to the
hydrogel core material. The microspheres, nanospheres, and other
structures and/or the hydrogel core may further comprise radio frequency
or other electronic chips or nanochips, capable of transmitting and/or
receiving electronic signals from external transmitters and/or receivers.