We performed complex investigations of antioxidant properties and the lipid composition of the five gram-negative bacteria depending on the cultivation season. Structural state, the lipid composition and physicochemical properties of lipids of the three gram-negative bacteria (Renobacter vacuolatum, Flectobacillus major WKM 869, Pseudomonas fluorescens) during their growth and mycelium of four species of the xylotrophic basidiomycetes (Panus tigrinus IBK-131, Fomes fomentarius M71, Laetiporus sulfureus M131, Piptoporus betulinus M60) during the lag phase were also studied. Changes in the composition of the lipid component in the studied bacteria led to considerable structural rearrangements in their membrane system during the growth of bacteria. It is shown that more hydrophilic regions of the lipid component are of paramount importance in maintaining the fluidity of the entire lipid bilayer in the basidiomycete mycelium. The scale and direction of the revealed interrelations between rotational correlation times of probes and the lipid composition depend both on localization of the probe in membrane and the composition and physicochemical properties of the microorganism lipids.
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