Nanotechnology Research and Practice, 2014, Vol.(4),  4 201 Copyright © 2014 by Academic Publishing House Researcher Published in the Russian Federation Nanotechnology Research and Practice Has been issued since 2014. ISSN: 2312-7856 Vol. 4, No. 4, pp. 201-212, 2014 DOI: 10.13187/ejnr.2014.4.201 www.ejournal13.com UDC 541.144; 544.77 Methods for Preparation of Microdispersed Colloid Silver Nanoparticles 1 Oleg Mosin 2 Ignat Ignatov 1 Moscow State University of Applied Biotechnology, Russian Federation Senior research Fellow of Biotechnology Department, Ph.D. (Chemistry) 103316, Moscow, Talalihina ulitza, 33 E-mail: mosin-oleg@yandex.ru 2 The Scientific Research Center of Medical Biophysics (SRC MB), Bulgaria Professor, D. Sc., director of SRC MB. 1111, Sofia, N. Kopernik street, 32 E-mail: mbioph@dir.bg Abstract In present review article are considered methods of preparation of microdispersed colloid silver nanoparticles and scopes of its practical application in nanoindustry, bionanotechnology, medicine and allied industries, including water processing and water purification. The mechanisms of bactericidal influence of colloid silver on a microbic cell are considered from the point of view of absorptive, electrostatic, enzyme and mutagen theories. Silver exerts both bactericidal and bacteriostatic effect against more than 500 species of microorganisms. Effect of bacterial destruction by silver drugs is 1,500 times more than the same concentration of phenol and 3,5 times more than the action of mercuric chloride. It is shown that effects of colloid silver are defined by concentration, the sizes of microdispersed nanoparticles and their stabolity in warer solutions, which are being prepared by means of various physico-chemical, biochemical and biotechnological methods. Keywords: colloid silver, nanoparticles, bionanotechnology, ionation of water. Введение С (Ag) –     107,87 ...,         Д. И. М,       ,        . О      .