2 ence of a wave zone or induction zone under industrial and exper imental conditions determines the physical values used to assess the intensity of irradiation (the power flux density or the field in tensity), the instruments used for measuring, and the experimental technique (irradiation from a distant source, in a cavity resonator, inductor, capacitor, and so on). The physical parameters eVidently also determine the biolog ical effects of the different frequency bands. In recent decades various bands of radio waves have been extensively used in many branches of industry. The microwave band has been widely applied in the field of radar, radionavigation, radioastronomy, radiometeorology, radiocommunication, nuclear physics, and physiotherapy. The short-wave and ultrashort-wave band are used for physiotherapy, radiocommunication, broadcast ing, television, and also for the heat treatment of dielectrics and for welding plasticized rubber. The long and medium waves are used for the heat treatment of metals in the vacuum-tube industry and in mechanical engineering.

Inhalt
The present state of the problem.- Experimental material and method.- Section I. Physiological and Morphological Changes in Animals Exposed to Radio Waves of High Intensity.- 1. Morphological and physiological changes following exposure to high-intensity microwaves (centimeter, millimeter, and decimeter bands).- 2. Morphological changes in animals following exposure to ultrashort waves (69.7, 155, and 191 MHz) of high intensity.- 3. Morphological changes in animals exposed to short and medium radio waves of high intensity..- 4. Comparison of morphological changes following exposure to radio waves of high intensity and of different frequencies.- Conclusion.- Section II. Physiological and Morphological Changes in Animals after Prolonged and Repeated Exposures to Low-Intensity Radio Waves of Different Frequencies.- 1. Morphological changes following prolonged and repeated low-intensity microwave irradiation.- 2. Morphological changes in animals following repeated low-intensity irradiation with ultrashort waves.- 3. Morphological changes in animals following repeated irradiation with low-intensity short waves.- 4. Morphological changes in animals following repeated irradiation with low-intensity medium waves.- 5. Comparison of morphological changes following repeated exposure to low-intensity radio waves of different frequencies (microwaves; ultrashort, short, and medium waves).- Conclusion.