The role of temporal coherence at photodynamic action of light on living cells was investigated. A mathematical model describing the interaction of low-coherent speckles with bacterial cells was suggested and its parameters were determined based on experimental data. The interrelation between the life time of dynamic optical speckles and the degree of photodestruction of illuminated cells was established by computer simulations. The conditions were determined under which the photoinactivation of cells of the vaccine strain of the causative agent of F. tularensis 15 NIIEG occurs.
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