[A fluorescent-cytochemical method for selective detection of yeast mitochondrial DNA].

Yeast mitochondrial DNA (mDNA) can selectively be detected using a specific dye (DAPI). Nuclear DNA (nDNA) was stained along with mDNA only in three out of the fifteen studied yeast strains. Visualisation with a luminescent microscope showed that mDNA content varied among different yeast species as well as the size and shape of fluorescent mitochondrial nuclei.

[Change in the structural organization of Mycobacterium rubrum cells upon the action of ethidium bromide].

The action of ethidium bromide on Mycobacterium rubrum cells was studied. The culture growth was found to depend on ethidium bromide (EB) concentration in the medium. The reaction of EB with nucleoid DNA was shown to be specific and changes in the nucleoid structure were detected.

[Cytological characteristics of the thermophilic bacterium Thermus ruber].

The obligate thermophilic bacterium Thermus ruber 12b was examined using optical and electron microscopy. Its cells were shown to be polymorphous. In a liquid medium, the cells associate yielding complex spherical bodies having a surface layer in common and complexes consisting of two or more cells but without a common envelope.

[In vivo study of the growth characteristics of the microflora of Armenian yogurt].

The microflora from the Armenian yoghurt was studied during its growth on the optimal for the medium (skim milk) using objectives of the Peshkoff system. It was shown that certain organisms of Lactobacterium jogorti tended to branch at the early stages of their growth, and the cells elongated and formed complex coils and helices by the third-fourth day of growth. Compact aggregates of cocci having angular outlines appeared in the culture of Streptococcus thermophilus by the end of the second day of growth.

[Ultrafine structure of Lpp-1 cyanophage-infected Plectonema boryanum cells].

The interaction of the cyanophage Lpp-1 with the trychomous blue-green alga Plectonema boryanum was studied. The stage of formation and maturation of phage particles was found to be preceded with the production of the DNA-phage pool similar in its morphology with that in trychomous bacteria of the order Caryophanales. Phagolysis of Pl.