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The acoustic radiation is similar to electromagnetic in many respects, in particular, heat radiation is described almost by the identical formulas. Ultraweak electromagnetic radiation is capable to play a significant role in biological processes because the intensity of background thermal radiation at frequencies of an optical range is negligibly small, i.e. of about a fraction of a quantum on 1 sq. centimeters in 1 sec. Besides, the mechanisms to explain a radiation of a single quantum of light are known, as well as the mechanisms to perceive them.

The situation with the ultraweak acoustic radiation is investigated to a much smaller degree. Phonon gas is possible to be considered as an acoustic radiation, if the wavelength exceeds an interatomic distance ten times; i.e. the wavelength is of the order of 1 nm. The intensity of this radiation is rather great. The appropriate squared sound pressure is determined by a density of a medium, velocity of a sound in it, Boltzmann's constant, absolute temperature, and also a bandwidth of an accepted radiation and square of a receiving device, which size should be in some times more, than wavelength. The magnitude of pressure can be of order of the atmospheric one. In traditional acoustics special sources and probes of the radiation are used. As sources, for example, the piezotransducers are applied. They change their geometric dimensions under the influence of an electrical field applied to them. A reverse phenomenon is used for receiving the signals. In acoustics of a thermal acoustic radiation, in the correspondence with main principles of thermodynamics, the sources of an acoustic radiation are the pieces of a medium, in which the absorption of a sound is maximum. Therefore problem of generation of thermal sound waves is solved automatically. Inside- and inter-cell communications on acoustic waves, at a first approximation, seems to be in redistribution of acoustic streams. It is known, that many structural transitions in macromolecular systems are accompanied by the change of an absorption coefficient of sound waves, therefore it is possible to expect, that the integrated acoustic field of the cells or tissue, to some extent will follow these processes. To such processes, it is possible to refer the transformations of Na-K-ATPase molecule during the ionic transport (Apell, Sokolov), synchronous opening of proton ionic channels (Antonenko, Pohl), lateral transfer along the bilayer the structural reorganizations induced by binding of a substratum to an enzyme molecule (Hianik, Passechnik). It is necessary also to mark that, as we have shown experimentally, the field of a thermal acoustic radiation has correlation properties. This peculiarity of the thermal acoustic radiation can explain the ability to have a directed effect in the certain points of space. The study of a thermal acoustic radiation as a background process always present in all living tissues will help one to update concept and role of the ultraweak acoustic radiation in biological processes.
 

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