The effects of a low-frequency pulsed magnetic field (1.5 Hz) and low-intensity laser radiation (0.3 and 0.7 W) on the activity of intracellular oxidoreductases of micromycetes, Penicillium cyclopium, Aspergillus niger, and Alternaria alternata, which are active agents of biodegradation of industrial materials, were studied. The studied physical factors had dose-dependent effects on the activity of fungal intracellular oxidoreductases (catalase and peroxidase); both an increase and a decrease in enzyme activity were observed. An increase in the activity of enzymes can contribute to the manifestation of the adaptive properties of fungi to the action of such physical factors as low-intensity laser radiation and magnetic field. A decrease in the activity of intracellular catalase and peroxidase under the action of these factors may inhibit the vital activity of microorganisms.

An assessment of the impact of low-intensity laser irradiation (LILI) and magnetic field (MF) on the biodegradation of a number of industrial products: wood fiberboard (WFB) and polyester caused by filamentous fungi is presented. It has been established that the magnetic field is capable of causing intensive destruction of wood fiberboard and polyester by fungi Alternaria alternata, Aspergillus niger, then the destructive process of WFB in the case of Penicillium cyclopium remained at the control level, and in the case of polyester it slowed down. The action of LILI, on the contrary, increased the destructive activity of Penicillium cyclopium in variants with WFB, and for polyester in the fungi Alternaria alternata, Aspergillus niger. Differences in the change in the resistance of products to fungi under the action of LILI and MF can be associated with both the physiological and biochemical characteristics of fungi and the aging process of polymers under the influence of the studied physical factors.

Effect of low-frequency pulsed magnetic field and of low-intensity laser radiation on mycelial fungi actively degrading various polymer materials was studied. These factors had a different effect on spores of fungi and mycelia. Irradiation could stimulate and suppress fungal growth. The studied physical factors had dose-dependent effects on activity of the extracellular fungal oxidoreductases (catalase and peroxidase); both increased and decreased enzymatic activities were observed.