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Biomedical subjects

V V Semenov

Publications and source records attributed to V V Semenov.

At least 19 recordsLinked to original sources
PubMed2005

Clastogenesis and aneugenesis in children with cerebral palsy.

The genetic system in children with cerebral palsy was studied by the method of registration of chromosome aberrations and micronuclei in peripheral blood lymphocytes and erythrocytes. A high level of chromosome aberrations and micronuclei in the peripheral blood cells was revealed. A significant reduction of the integral antioxidant capacity of the blood and plasma was detected by coulombometric titration with electrogenerated bromine in patients with all forms of cerebral palsy. Aneugenic and antianeugenic effects of glutamate were studied in experiments on mice. Biphasic effect of glutamate was revealed: it exhibited aneugenic effect in high doses and antianeugenic in low doses. Impairment of the genome stability in children with cerebral palsy is believed to be caused by increased generation of endomutagens under conditions of disease and reduction of the genome antimutagenic defense system.

Adolescent↗
PubMed2005

[Clinical, tomographic and immunogenetic study of patients with infantile cerebral palsy].

A neurovisual and immunogenetic study of patients with different forms of cerebral palsy was conducted. Morphological peculiarities of each form were described. A frequent combination of pathology of cerebrospinal fluid spaces and periventricular area with disruption of neuronal migration and development of brain mass and volume was found. HLA-typing revealed a significant association of the disease with antigen B13. An association of cerebral palsy with particular genetically determined vulnerability of fetal brain to lesions disrupting genetic program for neuroontogenesis is suggested.

Adolescent↗
PubMed2002

[Genoprotective human blood activity and its mechanisms].

Anticlastogenic properties of plasma and proteins (albumin and gamma-globulin) of the human blood were studied using seeds of Crepis capillaris (chromosome aberration assay). Antimutagen p-amino-benzoic acid was used as a comparative reagent. Anticlastogenic activity dependent of processing conditions of the biosubstrate used; for the pre-processing and combined processing anticlastogenic effect was higher than for post-processing, the processing properties of the blood being higher than those of the blood proteins. Anticlastogenic potential of biosubstrates did not depend on mutation inductor. Complex-formimg properties of plasma and blood albumen have been revealed using spectrop-hotometry through the substantial spectral displacement--relative to the expected spectrum--for the mixture of biosubstrata and mutagens. Using chemoluminescence, all plasma, albumin and gamma-globulin concentrations have been shown to enhance generation of hydroxyl radical of the Fenton reagent, especially for albumin in 1.0 g/l concentration. The general trend for all experiments was that the said substances diminished the stimulating effect as their concentrations grew. Peroxidation of yolk lipoproteids showed that only high concentrations of blood's plasma and albumen have antioxidizing properties. gamma-Globulin did not reveal any ability to inhibit lipid peroxidation of yolk lipoproteids. Complex-forming mechanisms of blood's albumen and antioxidizing property of human plasma and proteins have been proved to form the blood's anticlastogenic potential.

Albumins↗
PubMed2001

Purine receptor agonists protect the genome of plant and animal cells from clastogen damage.

Purine receptor agonists adenosine, cyclohexyladenosine, phenylisopropyladenosine, dimethylaminopurine riboside, ATP, and ADP reduced the level of chromosome aberrations and the number of micronuclei induced by ethylmethane sulfonate and cyclophosphamide in plants (Crepis capillaris) and mice. Possible mechanisms of the protective effect of these ligands are discussed.

Animals↗
PubMed2000

Synthetic utilization of polynitroaromatic compounds. 1. S-derivatization of 1-substituted 2,4,6-trinitrobenzenes with thiols.

Reactions of 1-R-2,4,6-trinitrobenenes (R = alkyl, protected aldehyde, aminocarbonyl, cyano groups, or isoxazole ring) with thiol salts were investigated. In most cases, these reactions gave a mixture of minor para and major ortho substitution products. Reactions of N,N-disubstituted 2,4,6-trinitrobenzamides with S-,O-, and N-nucleophiles afforded products of substitution of the p-nitro group exclusively. 1-Cyano-2,4,6-trinitrobenzene was found to be the most reactive and the least selective: all three nitro groups can be substituted using an excess of thiol salts. 2-R-4, 6-dinitrobenzamides showed no regioselectivity under similar conditions to yield 1:1 mixtures of para and ortho isomers.

Journal Article↗
PubMed2000

Synthetic utilization of polynitroaromatic compounds. 2. Synthesis Of 4,6-dinitro-1,2-benzisothiazol-3-ones and 4,6-dinitro-1, 2-benzisothiazoles from 2-benzylthio-4,6-dinitrobenzamides.

Cyclization of 2-benzylthio-4,6-dinitrobenzamides to 4,6-dinitro-1, 2-benzisothiazol-3-ones was achieved using SO(2)Cl(2) in CH(2)Cl(2) at room temperature. Alkylation of these heterocycles proceeded in a nonregioselective manner to yield a mixture of corresponding O- and N-alkylated products. Oxidation of 4,6-dinitro-1,2-benzisothiazoles (50% H(2)O(2) in AcOH) afforded the corresponding S-oxides and S, S-dioxides, depending on oxidation conditions. Unexpectedly, oxidation of a 3-methoxy derivative resulted in ring opening with the formation of the corresponding sulfamide. Chlorination of these 4,6-dinitro-1,2-benzisothiazol-3-ones (PCl(5)-POCl(3)) gave the expected 3-chloroisothiazoles.

Journal Article↗
PubMed2000

trans-1-Cyano-2-(2-methoxyphenyl)-1-nitroethylene.

The title compound, C(10)H(8)N(2)O(3), has been prepared by condensation of 2-methoxybenzaldehyde and nitroacetonitrile in ethanol at room temperature. Its investigation has been undertaken as a part of search for new nonlinear optical compounds. The pi-conjugated molecule is almost planar. Molecules in the crystal are packed in stacks with antiparallel molecular orientation and slightly alternating distances between mean molecular planes.

Journal Article↗
PubMed1999

[Study of the mutagenic and antimutagenic activity of the human and animal blood].

Mutagenic and antimutagenic properties of humans, bull, rabbit, chick, rat, and mouse were studied using seeds of Crepis capillaries (the chromosome aberration test). Antimutagenic activity was found in pre-processing, combined, and post-processing conditions of the seeds with a blood relative to the mutation inductors. Whole human and animal blood was found to be capable of inducing chromosome aberrations far exceeding the level of spontaneous mutations. Dilution of the blood did not eliminate its antimutagenic activity.

Animals↗
PubMed1997

[Receptor regulatory mechanisms of antimutagenic action].

Based on the data available in the literature and his own findings, the author suggests that there is a receptor regulatory mechanism of action in some antimutagens. The primary signal can be induced by an antimutagen at different stages of a regulatory cascade: a membrane, cell effectors, and cell ensembles. At the terminal stage, there is an activation of the natural system of antimutagenesis activates and an enhanced cell resistance to a mutagen.

Animals↗
PubMed1997

[Mutagenic and antimutagenic activities of human whole blood, plasma and albumin].

The seeds of Crepis capillaris were used to examine the mutagenic und antimutagenic properties of human whole blood, plasma, serum albumin and gamma-globulin by recording chromosomal and chromatid aberrations. The antimutagenic activity was determined by preliminary, simultaneous, and subsequent biosubstrate treatments of the seeds. The whole and twice-diluted blood, as well as plasma, induced aberrations exceeding the level of self-arbitrary mutagenesis by 3.7-5.3 and 2.6-3.1 times, respectively. When the blood was diluted to its 20% concentration, the antimutagenic efficiency of biological fluids was recorded. Human serum albumin and gamma-globulin were found to have an antimutagenic effect. In the dilutions having no antimutagenic effect, blood, plasma, and albumin showed their ability to be effectively decrease the level of induced aberrations.

Antimutagenic Agents↗
PubMed1995

[Mutagenesis, antimutagenesis and the cellular regulatory system].

Mutagenesis and antimutagenesis during modification of the cellular regulatory system were studied on Crepis capillaris seeds. The study used modifiers, such as adenosine, theophylline, cAMP, caffeine and colchicine. Low concentrations of the modifiers were shown to decrease the level of the induced mutations, while high ones increased them. There was a correlation between endogenous cAMP levels and the rate of antimutagenesis in the course of the experiment.

Adenosine↗
PubMed1993

[Quantitative and qualitative criteria for assessing the efficacy of antimutagens in an experiment].

The antimutagenic effect of para-aminobenzoic acid, tocopherol, adenosine and caffeine has been studied in experiments with microorganisms, Crepis capillaris seed cells, human lymphocytes, murine bone marrow cells in vivo. The activity, of antimutagens, their nature and action range, effective concentrations have been assessed. The type and severity of removable damages have been identified. Quantitative criteria for evaluating the effects of antimutagens have been defined.

4-Aminobenzoic Acid↗
PubMed1990

[Mutagenic activity of antineoplastic agents under conditions of normal and artificial modification].

Mutagenic effect of vincristine, vinblastine, thiophosphamide, sarcolysine and the supermutagen ethyleneimine was studied in Crepis capillaris germinating seeds at the G phase. Metabolic conditions, prolongation of cell cycle, specific activity of preparation as well as inhibition of DNA synthesis were found to modify the mutagenic process induced by antitumour agents.

Antineoplastic Agents↗
PubMed1989

A mathematical model of the kinetics of blood coagulation.

Linear mathematical models of the kinetics of blood coagulation have previously been presented (Levine, 1966, Science, N.Y. 152, 651; Martorana & Moro, 1974, Math. Biosci. 21, 77). In this paper a non-linear mathematical model of the extrinsic pathway of blood coagulation is presented to take into account a positive feedback. The feedback is due to factor Va as a co-factor involved in thrombin formation. The extrinsic pathway is shown to function as an amplifier cascade if a vessel wall injury exceeds a threshold value. For sub-threshold stimulation, the extrinsic pathway does not function.

Blood Coagulation↗
PubMed1989

[Results of the surgical treatment of perforated ulcer of the stomach and duodenum].

The authors studied the results of operations for perforated gastric and duodenal ulcers performed from 1978 to 1987. During this period, 263 operations were carried out, the postoperative mortality was 11%. The late results were studied in 137 patients in follow-up periods of 12 months to 11 years. Decrease in the postoperative mortality rates depends on timely hospitalization of the patient and adequate performance of the operation. Closure of the ulcer with sutures is expedient in young patients who have no clinical manifestations of the disease (silent ulcer). In individuals with recurrent ulcers, the subsequent therapeutic policy must be more active, that is planned surgical treatment.

Adult↗
PubMed1989

[Microflora of gastric juice and its sensitivity to antibiotics in post-gastrectomy gastritis].

Fifty four patients with postresection gastritis and 13 healthy adults were examined. 141 microbial cultures belonging to 33 species were isolated from the gastric juice of the patients. In the healthy persons 27 cultures belonging to 7 species were isolated from the gastric juice. In the gastric juice of the patients there predominated enteric bacteria and enterococci (64.8 +/- 6.5 and 57.4 +/- 6.7 per cent respectively). Among the enteric bacteria Escherichia coli and Proteus spp. were the most frequent. Contamination of the gastric juice by such microbes amounted to 10(5)-10(9) microbial bodies per 1 ml. The isolates were mainly sensitive to gentamicin (84.8 +/- 2.9 per cent).

Adult↗