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The silver and copper nanoparticles in water and ethanol extracts of some plants were synthesized by the method of “green” chemistry. The synthesized nanoparticles are studied by the methods of a spectophotometery, dynamic light scattering and their stability is studied. The possibility of reduction of the sizes of nanoparticles is shown by the method of an ultrasonic dispersion. The synthesized nanoparticles...