STUDY OF INFLUENCE OF THE HIGH-FREQUENCY ELECTRIC FIELDS ON MICROBIAL VITAL ACTIVITY AT VARIOUS TEMPERATURES

• Published in: Nauchno-tekhnicheskiĭ vestnik informat͡s︡ionnykh tekhnologiĭ, mekhaniki i optiki mekhaniki i optiki, 2017-03, Vol.17 (2), p.279
• Main Authors: Sibirtsev, V S, Ignatjeva, A F, Shichkova, K A, Tran, Thanh Tuan, Stroev, S A, Radin, M A
• Format: Article
• Language: Russian
• Subjects: Electric fields; Electrical resistivity; Heating; Microorganisms
• ISSN: 2226-1494; 2500-0373
• DOI: 10.17586/2226-1494-2017-17-2-279-286

The biotesting technique is described, concluded in valuation of рНchange, electrochemical redox potential and conductivity on a low-frequency alternating current samples, initially containing determined quantity of test microbes, incubated during a given time at given temperature in liquid medium of a given structure. We have submitted results of a given technique application to the analysis of influence on dynamics of growth and metabolic activity of Lactobacillus bulgaricus at various thermal and electrical factors. It is shown that after preliminary heating of L.bulg. during 10 minutes at 50ºС, vital activity of these microbes grows authentically and prolongably. While after similar heating at 60ºСthose activity reduces significantly. It is also shown that even unitary 60 minute action by a similar alternating electric field with an average intensity of 50 V/m at frequency of its change from 0.1 up to 3 Mc can significantly inhibit test microbial vital activity. The action by a similar electric field with frequency equal to 35 Mc, on the contrary, authentically and prolongably intensify those vital activity. Thus, it is shown that electrochemical biotesting is a sensitive laboratory tool, providing the researcher accessible, convenient and informative way for valuation of influence of various physico-chemical factors on a living body. It is also shown, that the imposing of external and not enough intensive electric fields in a combination with various modes of stress temperature processing is a perspective method for both suppression of harmful growth, and activation of vital activity of useful microflora (that can be useful, in particular, for efficiency increase of various medical and biotechnological processes).