Desulfuromonas acetoxidans, which is regarded to the oldest microorganisms that exist in the Earth, are uncoloured gram-negative obligatory anaerobic bacteria that have an ability to reduce S 0 to Н 2 S. This process supports bacteria with sufficient amount of energy which they need for growth. At the same time high concentrations of hydrogen sulfide are very toxic towards all living organisms. Different metal ions that exist in surrounding environment in small concentrations are essential for microorganisms because they support normal functionality of them. But in high concentrations they have a detrimental influence on cell structure and it functions. Srains of D. acetoxidans bacteria that have high toxic metals resistance can neutralize the toxicity of hydrogen sulfide, which is the final product of dissimilative sulfurreduction, and these metals as the result of their particular binding and forming the insoluble precipitations. Light scattering changes and metals accumulation ability of D. acetoxidans bacterial cells under the influence of CuSO 4 , PbNO 3 , ZnSO 4 and CdSO 4 have been investigated. The changes of light scattering characteristics of bacterial D. acetoxidans cells on the base of their size distribution and relative content under the influence of investigated metal salts have been observed by the new method of measurement. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/26/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Proc. of SPIE Vol. 8152 81520B-2 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/26/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Proc. of SPIE Vol. 8152 81520B-6 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/26/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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New method and instrument intended for checking the content of biology particles in dimension band 0.1-10.0 mkm in water flow is described in this report. The instrument measures the intensity of light scattered by the particles suspended in liquid flow when they are crossing the laser beam. The results of studying of light scattered by platelet and bacterium's such as Pseudomonas aeruginosa, Escherichia coli, Microcôccus lutteus in such liquid mediums as physiological solution and glucose solution are described.

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The determination algorithm of aerosol microparticles` size distribution by iteration process is described. In the described method the particle, registered by optoelectronic devices is characterized by parameters of amplitude and duration of impulse. Distribution of particles` size is determined from the measured functional dependence of number of registered particles from amplitude and duration of the proper electric impulses on the output photo-detector. Given dependence, within limits of statistical errors, is repeated when performing measurement series in the medium with identical optical parameters. It is linked by functional dependence to relative particles' fraction of different sizes, which is expressed by integral first kind Fredholm equation.