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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.

The physics principle of registration immune reaction by light scattering methods is concerned. The operation of laser nephelometry for measuring antigen-antibody reaction is described. The technique of obtaining diagnostic and immune reactions of interaction latex agglutination for diphtheria determination is described.

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