PubMed Health⌕ Search

Biomedical subjects

G Benkö

Publications and source records attributed to G Benkö.

At least 19 recordsLinked to original sources
PubMed1987

Alterations in monoamine oxidase activity of the mouse brain and liver after mixed neutron-gamma irradiation.

Monoamine oxidase (MAO) plays an important role in the metabolism of neuro-transmitter biogenic amines. Its activity was determined in mouse brain and liver after exposure to different kinds of ionizing radiation and after pretreatment with a radioprotective agent. After a lethal dose of mixed neutron-gamma irradiation the MAO activity decreased in the brain and increased in the liver. In contrast, after a lethal dose of 60Co-gamma irradiation enzyme activity was considerably increased in the brain while in the liver it increased like after mixed neutron-gamma irradiation. AET (S2-aminoethyl-isothiuronium-Br X HBr), when administered in a radio-protective dose, inhibited MAO activity in the brain, while it increased in the liver. Even more marked changes of enzyme activity were observed in both brain and liver after AET pretreatment and mixed neutron-gamma irradiation. On the basis of the results it is suggested that different kinds of ionizing radiation lead to different types of lipid peroxidation in the lipid environment surrounding MAO, an event leading to altered enzyme activity. AET itself inhibited MAO in the brain and increased the activity in the liver but did not prevent the alterations caused by ionizing radiation in enzyme activity.

Animals↗
PubMed1984

The effect of superoxide dismutase on the radiosensitivity of bacterial spores at various oxygen concentrations.

Superoxide dismutases are considered to be essential protective agent against radiation injury. Experiments were carried out to investigate the effect of extracellularly added SOD on the radiosensitivity of Bacillus megaterium spores. 120 micrograms/ml SOD had no effect on the radiosensitivity of Bacillus megaterium spores at different oxygen concentrations. Relative enzyme activity obtained at various oxygen concentrations indicating the lack of oxygen effect in the radiation-induced inactivation of SOD.

Bacillus megaterium↗
PubMed1984

Combination of misonidazole and lipoic acid on the radiation sensitivity of Bacillus megaterium spores.

The radiation sensitizing action of a combination of misonidazole and lipoic acid was investigated in Bacillus megaterium spores at various oxygen concentrations. Lipoic acid and misonidazole were applied in two concentrations (0.1 and 1.0 mmol/l) and four combinations were prepared from them. No uniform correlation was found, neither to the combination of the compounds nor to the gas conditions. The combination of two radiation sensitizing compounds with in all probability different action mechanisms does not unequivocally enhance the radiation sensitizing effect under anoxic and hypoxic conditions.

Bacillus megaterium↗
PubMed1984

Study of "prostacyclin-like" activity in the rat blood vessel: changes in prostacyclin production related to body weight.

The prostacyclin-producing capacity of various blood vessels was studied using platelet aggregation bioassay in rats of different ages. Results showed that --the PGI2 producing capacity of arteries was five to tenfold of the respective veins; --in the arteries the PGI2 production calculated for unit vascular mass declined from the centre to the periphery, despite the relative increase of endothelial surface area. This points to the importance of other vascular elements in the control of PGI2 production; --the PGI2 forming activity of some blood vessels increased with the age up to a limit (300-400 g body weight), decreasing thereafter. Based on these results we conclude that major part of PGI2 in systemic blood originates from the large arteries, whereas the low PGI2 production of the veins might play a role, among others, in the more frequent occurrence of venous thrombosis.

Aging↗
PubMed1984

Effect of acute 60Co-gamma-irradiation on the in vivo lipid peroxidation in experimental animals.

The effect of sublethal (6.0 Gy) and LD50/30 (9.0 Gy) doses of 60Co-gamma-irradiation on malondialdehyde (MDA) level was studied in rats. The findings suggest that in the organs investigated (brain, liver, spleen, kidney, testicle, stomach, small intestines) acute 60Co-gamma-irradiation increased the formation of MDA, the main product of lipid peroxidation, in a time-related manner to an extent characteristic of the organ investigated. Differences in the degree and temporal development of the changes allow some conclusions as to the radiosensitivity of individual organs. On this basis it can be assumed that the increase in MDA level caused by irradiation considerably contributes to the development of certain symptoms of radiation sickness.

Animals↗
PubMed1980

[Absorption and distribution of benzyloxyamine-containing aerosols (author's transl)].

The study of the blood levels and tissue concentrations in mice to which 14C-benzyloxyamine hydrochloride was applied in the form of a spray and of a suspensoid aerosol evidenced the good abosrption of this pharmacon. Maximum blood levels were observed 0.5 hour after administration of the spray. When the aerosol was given, the blood levels increased progressively and reached maximum values at the end of the experiment, 4 hours after application. The concentrations found in the lung, stomach, kidney and liver were, in general, higher on suspensoid aerosol application (maximum values being reached after 1--2 hours) than on spray administration.

Absorption↗
PubMed1979

The effect of unipolar aeroions on the capacity of mammalian organism.

Based on animal experiments authors established that the different polarity high-concentration aeroions have an effect on the vegetative centres of the Central Nervous System (CNS). Through vegetative centres they influence both electro- and neuro-physiological relations of the nervous system and by this means they make an effect on the capacity. Aeroions have some explicitly favourable effect both on the orientation reflex action and the alert system of the brain stem. These effects can also be registered either by pharmacology tests or sinstrumentally (electronystagmography).

Air Ionization↗
PubMed1974

[Not Available].

Explore the source record for details and available documents.

History, Modern 1601-↗