[Effect of iron compounds on the treatment of fat-containing wastewaters].

Effects of iron compounds on methanogenic fermentation the water polluted with fatty acids were studied. A natural readily available source of iron applicable to biological treatment of liquid wastes was searched for. A positive effect of iron on the methanogenic fermentation of fats and their degradation products--long-chain fatty acids--in aqueous media was demonstrated.

[Use of the level of G+C n DNA for studying the molecular phylogeny o f methanogenic archaebacteria].

A new method for theoretical analysis of the molecular phylogeny of bacteria, successfully applied earlier to nitrifying bacteria, was used to study the molecular phylogeny of methanogenic archaebacteria. The group studied included Methanococcus igneus, Methanococcus vannielii, Methanothermus fervidus, Methanolobus tindarius, Methanobacterium formicicum, Methanosarcina barkeri, Methanobacterium thermoformicicum, Methanoplanus limicola, Methanospirillum hungatei, and Methanobacterium thermoautotrophicum. Based on the hypothesis that direct linear regression always exists between evolutionary changes in the DNA G + C content and the primary structure of rRNA, the branching order of the phylogenetic tree of methanogenic archaebacteria was determined.

[A morphological and cytofluorometric analysis of the age structure of yeast populations].

The morphological and cytofluorometric analysis of the age structure of yeast populations of Saccharomyces cerevisiae, Candida boidinii and Candida tropicalis were carried out. The phase of cell preparation for budding and three phases of budding were accounted in morphological analysis. The latter was determined by the ratio of size of a mother cell and a bud.

The structure of bacterial cell cycle and age structure of bacterial populations.

Study of synchronous and asynchronous cultures of Bacillus megaterium, Bacillus thuringiensis and Bacillus licheniformis has shown that the duration of chromosomal DNA replication (period C) is proportional to the generation time, and time between two cycles of the DNA replication (known as period I). The duration of period C is nearly constant and makes up from 0.5 to 1.

[The use of the neustonic forms of bacilli for purifying and decontaminating reservoirs].

It is shown possible to select the bacterial strains which are neuston ones, i.e., concentrating on the water-atmosphere interface.