Resonance in physics, chemistry and biology.

The resonant problems in different areas of physics, chemistry and biology from the unified point of view - extremeness of resonant statuses of motion in the nature are reviewed. In particular, the problems of dynamics of motion and holding of atomic, macroscopic particle, micro-organisms in inhomogeneous fields, outside and inside resonance conditions are analyzed; problems of dynamic stability of unstable states, bifurcation, chaos, discretization, evolution of non-linear dynamic systems which are not inclusive in an obvious view a small parameter. A fundamentals of the resonant theory of dynamic systems are set out. The unsolved problems are marked and the paths of their solution are planed, in particular: ball lightning, activated water, resonant effect of superweak fields at biological systems, including correlation between periods of solar activity and processes happening at this time on the Earth