2.4. Optical microscopy
Pure cultures of the yeasts and bacteria and their co-cultures
were investigated by the method of light field microscopy. A
Biomed-6 triocular microscope (Biomed, Russia) was used for
microscopic analysis; total magnification of the object was ×1600.
Before viewing, preparations were fixed and stained. Yeast cells
were stained with a fucsin solution; bacterial cells were Gram
stained.