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Biomedical subjects

B Asztalos

Publications and source records attributed to B Asztalos.

30 records · Page 2Linked to original sources
PubMed1985

Effect of pesticides on the LDH activity and isoenzyme pattern of carp (Cyprinus carpio L.) sera.

Copper sulphate (CuSO4), paraquat (PQ) and methidathion (MD) all caused tissue necrosis as demonstrated by increased levels of lactate dehydrogenase (LDH, EC 1.1.1.27) in blood sera. The main target of damage is shown by the isoenzymes appearing in the blood sera. The CuSO4 treatment damaged mainly the heart and skeletal muscles. This is indicated by the increased LDH level and the M and H subunits appearing in the isoenzyme pattern of the serum. PQ damaged first of all the gills and methidathion had an effect on the skeletal muscles.

Animals↗
PubMed1985

Time course of denervation diuresis and natriuresis in the anaesthetized rat.

The effect of unilateral renal sympathectomy on renal excretion of water and sodium was studied in three groups of Inactin-anaesthetized rats: 1-3, 4-19, and 20-35 weeks after denervation. Increased sodium excretion from the denervated kidney in the absence of changes in GFR was observed up to 35 weeks following renal denervation. Thus, in a functional sense, renal reinnervation may have only been partial during the time interval studied.

Anesthesia↗
PubMedDate not supplied

The effects of pesticides on some biochemical parameters of carp (Cyprinus carpio L.).

Treatments with copper sulphate (CuSO4), paraquat (PQ) and methidathion (MD) caused tissue damage and stress effects in carp, indicated by the increased lactate dehydrogenase (LDH), glutamic oxaloacetic transaminase (GOT), and glutamate dehydrogenase (GIDH) enzyme activities and elevated blood-sugar levels. Copper sulphate, administered together with PQ and MD, were synergistic in terms of tissue damage and stress effects. The isoenzyme patterns showed organ-specific tissue damage. The administered chemical and isoenzymes indicating liver damage were detectable in the blood. The combination of CuSO4 and MD caused focal cell necrosis, which was observable in the liver tissue by light microscopy. Electron microscopic studies revealed the presence of damaged parenchymal cells with electron transparent cytoplasms, myelin figures, and altered mitochondria ER and Golgi.

Animals↗
PubMedDate not supplied

Fluid dynamic characteristics of monopivot magnetic suspension blood pumps.

A monopivot magnetic suspension blood pump is a centrifugal pump under development with a magnetic suspension and a ceramic pivot to support the impeller with minimum contact. The pump size has been reduced by implementing a direct impeller drive mechanism in place of a magnetic coupling and motor. Flow visualization studies revealed that high shear, which seems to be closely related to hemolysis, concentrates in boundary layers near the walls. This implies that fluid dynamic shear can be reduced not by widening the gap, but by reducing the impeller velocity. Therefore, compared with the results of the previous semi-open curved vane impeller model, impeller velocity was reduced by 30% with a closed impeller having radial straight vanes, and smaller impeller/housing gaps. The volute shape around the impeller tip was also changed such that the outflow from the impeller enters along the center plane of the volute. To examine the effect of the improvements, hemolysis testing was conducted and found that the newly developed closed impeller model generated a lower level of hemolysis than the previous semi-open impeller model.

Animals↗