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Mitogenetic radiation discovered by A.G. Gurvich raised a number of questions, one of which was the question of an energy source for generating UV photons. Gurvich proposed free radical reactions as a generator of such photons because during them portions of energy equivalent to the energy of UV-photons is released. However, for stable production of free radicals in the course of such processes, as enzymatic reactions or gel-sol transitions, the participation of oxygen and water was required. Water when cleaved, would give such radicals as hydrogen atom and hydroxyl radical and oxygen would promote unquenchable going on of them. Gurvich experimentally proved that such radicals actually occur in aquatic systems. This contradicted the prevailing ideas about the properties of water and the oxidative reactions occurring in it. Therefore, Gurvich's models were not even considered by physicochemists. Recently, many facts have appeared indicating that water systems are heterogeneous systems in which some part of water reside in a liquid crystalline form. These molecules may split into radicals under the influence of a variety of low-energy factors, in particular mechanical impacts on water. If bicarbonate ions are present in water (and they are almost always present in water in contact with air), then, as we have shown, relatively short-term mechanical effects initiate long-term chain reactions involving free radicals in it. In this case, water systems become stably nonequilibrium systems in an electronically excited state. Under certain conditions, such systems can serve as photon sources, including UV photons. Thus, A.G. Gurvich's ideas of the mechanisms of mitogenetic radiation generation were almost a century ahead of the emergence of the experimental evidence base for them.