There is evidence that resistance to the action of silver is associated with lipids in the bacterial cell. The more lipids, the resistance of bacteria above. As a rule, pathogenic microorganisms are more sensitive to silver than saprophytes. Zimmermann, in his literature review reported that strains of aquatic bacteria get used to the silver. We also give evidence that, under certain low concentrations of silver not only causes the death of microorganisms, but also stimulates their growth. In 1919, for microscopic examination Zaus followed the deposition of silver in the body of microorganisms.
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Various bacteria capture the silver, depending on its size. Thus, the yeast in a dilution of 1: 10 (5) accumulate in their cells, silver, the amount of which may reach 4% on a dry weight of yeast. Under the influence of silver there is a change of culture and biochemical properties of the bacterium coli. Even the highest dose of silver does not cause the death of bacteriophage. At the same time, silver has a strong effect on viruses. According Lippelta, 1 mg / l silver causes a complete inactivation of influenza virus strains A1, B and Mitrs-strain for 30 seconds.
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AV Maselyuk and OS Nevkipilaya lead a higher concentration of silver (10 mg / l), causing complete inhibition of WGA (haemagglutinin) of influenza viruses A1, pan, A2. Sendai, Apr-8 for 30 seconds. It was found that the effect of silver on the virus decreases depending on increasing the number of passages viruses. They also found that the silver water, prepared by electrolysis, is more active than the solution of silver nitrate. Since the bactericidal effect of silver depends on the physico-chemical environmental conditions, different investigators obtained several kinds of data to determine the lethal dose of silver.
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Thus, according to EA Plevako, aqueous solutions of silver salts kill bacteria if the concentration of 10 (9) persons / L at 24 hours when the content in a solution of 0.04 mg / l of silver ions. This ratio value is surprising, and certainly relates to similar biotic effects of small amounts of substances such as hormones, vitamins and trace elements.