  For the first time in the world behavioral functions of laboratory mammals
exposed to silver nanoparticles were studied with the regard to age. Silver
nanoparticles coated with polyvinylpyrrolidone with the size of 8.7 nm were
used in the present research as a potential xcenobiotic. Elder mice adapted to
the xcenobiotic better than younger animals. Younger animals demonstrated more
drastic anxiety than the elder ones. Thus, it is concluded that adaptive
homeostasis non-linearly changes with the age. Presumably, it may improve
during the prime of life and start to decline just after certain stage.
