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Biomedical subjects

S S Stavskaia

Publications and source records attributed to S S Stavskaia.

At least 19 recordsLinked to original sources
PubMedDate not supplied

[Products of bacterial destruction of sodium dodecyl sulphate].

The products of Na dodecyl sulphate destruction by the three bacterial cultures--Pseudomonas aeruginosa, Flavobacterium devorans, Achromobacter guttatus--were examined. The cultures were shown to decompose Na dodecyl sulphate in a similar way. The primary mechanism of destruction was found to be hydrolysis of the sulpho-ester bond in the molecule, leading to the separation of sulphate-ion and formation of dodecanol. Products of bacterial destruction of alkyl sulphates did not show foam forming capacity.

Alcaligenes↗
PubMedDate not supplied

[Reorganization of the strain's cellular lipids--degradation of anionic surfactants during "detergent" stress].

Changes in the fatty acid composition and ultrastructure of Pseudomonas aeruginosa 1C strain--a destructor of alkyl sulphates under the effect of the stress evoked by sodium dodecyl-sulphate have been studied. It has been established that the "detergent" stress changes the ratio of the cell fatty acids (FA) towards the increase of their nonsaturation. Ultrastructural changes in the cells are revealed earlier than biochemical ones. Several stages in stress development have been distinguished. The escape from the stress state is performed both at the population level and at the level of individual cells, highly-resistant to dodecyl sulphate.

Detergents↗
PubMedDate not supplied

[Storage of Pseudomonas strains degrading the surfactants].

The survival rate and the destruction activity of Pseudomonas strains decomposing anionic and ampholytic surfactants were studied in the course of their storage for a long period of time. The strains were shown to remain viable and active after being freeze-dried for a year. Therefore, lyophilisation can be recommended as the main method of storage for bacterial strains decomposing the following surfactants: sulfoethoxylate, sulfonate, cyclimide, and amidobetaine.

Biodegradation, Environmental↗
PubMedDate not supplied

[Bacterial destruction of anionic sulfoethoxylate surfactants].

A Pseudomonas putida strain G was isolated and its activity in the destruction of sulfoethoxylates (surfactants) was studied as a function of the cultivation conditions. Ultrastructural changes were found in the cells utilizing sulfoethoxylates. Sulfoethoxylates were found to be decomposed by P. putida G via two pathways: (a) desulfation of the molecule and (b) cleavage of the alkyl ester bond. The intermediate products were not toxic and did not pollute the habitat. The strain can be used for microbiological purification of sewage.

Alkanesulfonates↗
PubMedDate not supplied

[Characteristics of the fatty acid composition of Pseudomonas aeruginosa cells with different degrees of resistance to dodecyl sulfate].

The fatty acid composition of Pseudomonas aeruginosa 1C destroying anionic surfactant alkyl sulfates was studied after its cultivation under different conditions which caused different resistance of the cells against sodium dodecyl sulfate (SDS). The content of monounsaturated fatty acids (in particular, octadecenoic acid) increased while the content of cyclopropane fatty acids decreased in cells resistant against SDS.

Drug Resistance, Microbial↗
PubMedDate not supplied

[Purification and study of the properties of a desulfonating enzyme in Pseudomonas alcaligenes].

An enzyme desulfonating anionic alkyl benzene sulfonate (ABS) surfactants was isolated from Pseudomonas alcaligenes TR and purified. The physicochemical and catalytic characteristics of the enzyme were studied. The kinetic constants of ABS desulfonation were determined and shown to depend on the length of a hydrocarbon radical. The molecular mass of the enzyme was found to be close to 60,000.

Benzenesulfonates↗