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Biomedical subjects

L V Vasil'eva

Publications and source records attributed to L V Vasil'eva.

18 recordsLinked to original sources
PubMed1989

[Clinico-genetic parallels in infectious inflammatory diseases of the lungs].

Investigation of the blood genetic markers ADB, Rh, Hp and Tr in 186 patients with chronic infectious inflammatory diseases of the lung revealed a significant increase in the blood group B(III), Rh- and phenotype Hp 2-2. It is proposed to consider the association of the blood group B(III), Rh- and Hp 2-2. as an unfavourable prognostic sign of infectious inflammatory diseases of the lung.

ABO Blood-Group System↗
PubMedDate not supplied

[A new triangular bacterium].

A new bacterium has been isolated; its cells are of a triangle shape and have a radial symmetry. The organism was compared with two other bacteria of a triangle shape described earlier: it differs from them by morphology and physiology.

Bacteria↗
PubMedDate not supplied

[Methanotrophs of the psychrophilic microbial community of the Russian Arctic tundra].

In tundra, at a low temperature, there exists a slowly developing methanotrophic community. Methane-oxidizing bacteria are associated with plants growing at high humidity, such as sedge and sphagnum; no methonotrophs were found in polytrichous and aulacomnious mosses and lichens, typical of more arid areas. The methanotrophic bacterial community inhabits definite soil horizons, from moss dust to peat formed from it. Potential ability of the methanotrophic community to oxidize methane at 5 degrees C enhances with the depth of the soil profile in spite of the decreasing soil temperature. The methanotrophic community was found to gradually adapt to various temperatures due to the presence of different methane-oxidizing bacteria in its composition. Depending on the temperature and pH, different methanotrophs occupy different econiches. Within a temperature range from 5 to 15 degrees C, three morphologically distinct groups of methanotrophs could be distinguished. At pH 5-7 and 5-15 degrees C, forms morphologically similar to Methylobacter psychrophilus predominated, whereas at the acidic pH 4-6 and 10-15 degrees C, bipolar cells typical of Methylocella palustris were mostly found. The third group of methanotrophic bacteria growing at pH 5-7 and 5-10 degrees C was represented by a novel methanotroph whole large coccoid cells had a thick mucous capsule.

Arctic Regions↗
PubMedDate not supplied

[The processes of methane formation and oxidation in the soils of the Russian arctic tundra].

Methane emission from the following types of tundra soils was studied: coarse humic gleyey loamy cryo soil, peaty gley soil, and peaty gleyey midloamy cryo soil of the arctic tundra. All the soils studied were found to be potential sources of atmospheric methane. The highest values of methane emission were recorded in August at a soil temperature of 8-10 degrees C. Flooded parcels were the sources of atmospheric methane throughout the observation period. The rates of methane production and oxidation in tundra soils of various types at 5 and 15 degrees C were studied by the radioisotope method. Methane oxidation was found to occur in bog water, in the green part of peat moss, and in all the soil horizons studied. Methane formation was recorded in the horizons of peat, in clay with plant roots, and in peaty moss dust of the bogey parcels. At both temperatures, the methane oxidation rate exceeded the rate of methane formation in all the horizons of the mossy-lichen tundra and of the bumpy sinkhole complex. Methanogenesis prevailed only in a sedge-peat moss bog at 15 degrees C. Enrichment bacterial cultures oxidizing methane at 5 and 15 degrees C were obtained. Different types of methanotrophic bacteria were shown to be responsible for methane oxidation under these conditions. A representative of type I methylotrophs oxidized methane at 5 degrees C, and Methylocella tundrae, a psychroactive representative of an acidophilic methanotrophic genus Methylocella, at 15 degrees C.

Arctic Regions↗
PubMedDate not supplied

[A psychrotolerant Caulobacter sp. from Russian polar tundra soil].

Strain Z-0024, a psychrotolerant aerobic heterotrophic representative of the prosthecate bacteria of the genus Caulobacter, was isolated from a methanotrophic enrichment obtained from Russian polar tundra soil. The cells of the new isolate are vibrios (0.5-0.6 x 1.3-1.8 microm) with a polar stalk. The organism grows in a temperature range from 5 to 36 degrees C, with an optimum at 20 degrees C. The pH range for growth is from 4.5 to 7.0 with an optimum at pH 6.0. Strain Z-0024 utilizes a wide range of organic compounds: sugars, amino acids, volatile fatty acids, and primary alcohols. It tolerates a NaCl concentration in the medium of up to 15 g/l. The G + C content of DNA is 66.6 mol %. The 16S rRNA gene sequence analysis revealed that strain Z-0024 belongs to the cluster of Caulobacter species, showing a 98.8-99.2% sequence similarity to them. DNA-DNA hybridization revealed a low level of homology (24%) between strain Z-0024 and C. vibrioides ATCC 15252. The new isolate is described as Caulobacter sp. Z-0024.

Base Composition↗
PubMedDate not supplied

[New genus of budding bacteria Angulomicrobium tetraedrale having radially symmetrical cells].

The growth cycle and the ultrathin structure were compared in two strains of polygonal bacteria. Due to the presence of radial symmetry, the type of division, the character of metabolism and physiology in common, the polygonal bacteria are classed as a separate genus, Angulomicrobium nov. gen. It would be too early to divide the genus into species. The diagnosis of the new genus and the species A. tetraedrale nov. gen. nov. sp. is presented.

Bacteria↗