[The theory of individual development (biophysical aspects)].

Long-term research data which induced the creation of negentropic (thermodynamic) theory of individual development are generalized. Attention is paid to the fact that the motor activity connected with energetic expenses in vital systems is the factor of abundant recreation processes induction providing the very possibility of development which is corresponding to their dysequilibrium, laborability and adaptive abilities. The negentropic theory enables to realize the mechanisms of individual development of both animals and plants. The latter differ in the indicated sense from the non-alive systems where working is, on the contrary, the factor of entropic dissipation. Attention is paid to a change of negentropic trend of development to the entropic one connected with gerontogenesis. Features of the negentropic theory of ontogenesis in contrast to the conventional ones for biological thermodynamics are analysed (E. Bauer, E. Schroedinger, I. Prigozhin).