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  • Articles: DFG German National Licenses  (4)
  • 1975-1979  (4)
  • 1930-1934
  • Blutgerinnung  (1)
  • Concentrating Mechanism  (1)
  • L-Aspartate  (1)
  • N-acetyl metabolite  (1)
Source
  • Articles: DFG German National Licenses  (4)
Material
Years
  • 1975-1979  (4)
  • 1930-1934
Year
Keywords
  • 1
    ISSN: 1432-1106
    Keywords: Spinal interneurones ; Renshaw cells ; L-Aspartate ; L-Glutamate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary L-Glutamate and L-aspartate were administered electrophoretically near spinal interneurones and Renshaw cells of pentobarbitone-anaesthetized rats. Other spinal interneurones were consistently more sensitive to L-glutamate than to L-aspartate. Renshaw cells, however, showed no consistent difference in their sensitivity to these two amino acids. The results, which are compared with those reported previously in the cat, support the hypothesis that L-glutamate could be a transmitter at spinal primary afferent terminals.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 359 (1975), S. 177-182 
    ISSN: 1432-2013
    Keywords: Kidney ; Citrate ; Metabolism ; Concentrating Mechanism ; Medullary Gradient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The intrarenal distribution of citrate was evaluated in the dog during antidiuresis and osmotic diuresis, by using the specific citrate assay method of Moellering and Gruber. The measurements were made on tissue samples taken from four different regions throughout the kidney: cortex, outer and inner medulla, and papilla. During antidiuresis, a characteristic distribution of citrate was observed with highest levels in the papilla and lowest ones in the outer medulla. A medullary concentration gradient for citrate was found. Mannitol greatly decreased papillary citrate and sodium, but no changes in outer and inner medullary citrate occured. The results could not be explained by the citrate contained either in the trapped urine or blood in the tissue. It is suggested that citrate accumulation in the inner regions of renal medulla may be accounted for by countercurrent mechanisms or regional differences in renal citrate metabolism.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 14 (1978), S. 383-390 
    ISSN: 1432-1041
    Keywords: Acebutolol ; N-acetyl metabolite ; drug plasma concentrations ; plasma renin activity ; hypertension ; β-blockade
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Relationships between plasma concentrations of acebutolol (Ac) and its N-acetyl metabolite (Am) and pharmacological effects were studied in patients with essential hypertension. In an acute study (N=7) 400 mg oral acebutolol produced similar peak plasma levels of Ac and Am but Am had a longer half life. Group mean pulse and blood pressure fell significantly, although the size of individual blood pressure fall varied five-fold. There was no significant change in plasma renin activity. Correlations were found between drug concentration and β-blockade, assessed as % reduction in exercise tachycardia, and between both of these and the fall in post exercise systolic blood pressure. Similar comparisons were made in a chronic optimum dose study (N=11) both pre-dose and three hours post-dose. Am concentration was consistently higher than Ac at both times. Blood pressure was lowered equally pre-and post-dose when compared to placebo and plasma renin activity (PRA) was reduced on active treatment. Correlations were again shown between drug concentrations and β-blockade but none were found with changes in blood pressure or PRA. Between subject differences in blood pressure response could not be fully explained in terms of the other measurements but it is unlikely that pharmacokinetic differences are the major source of this variability.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 53 (1975), S. 809-814 
    ISSN: 1432-1440
    Keywords: Blood clotting ; fibrinolysis ; streptokinase ; Blutgerinnung ; Fibrinolyse ; Streptokinase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Mit Hilfe eines Clot-Lysis-Tests war es möglich, Streptokinasekonzentrationen in Humanplasma quantitativ zu erfassen. Das Testsystem bestand aus Rinderfibrinogen, Rinderplasminogen, Human-Euglobulin, EDTA, Humanplasma (mit unbekanntem Streptokinaseanteil) und Thrombin. Plasminogen und Fibrinogen lagen stark konzentriert vor, so daß Plasminogen und Fibrinogen des zu testenden Humanplasmas keine Rolle spielten. Ein Zusatz von EDTA verhinderte, daß Gerinnungsfaktoren und Thrombocyten des auszutestenden Humanplasmas auf die Clot-Lysis-Zeit einen Einfluß nahmen. Die Fehlerbreite der Methode für 2 E Streptokinase lag beis=±0,19 E pro ml Plasma, für 5 E Streptokinase beis=±0,47 E pro ml Plasma und für 20 E Streptokinase beis=2,50 E pro ml Plasma. Plasmen von Patienten, die sich einer fibrinolytischen Therapie unterziehen mußten, wurden auf ihren Streptokinasegehalt untersucht. Es wurden Streptokinasekonzentrationen von 0,7 E bis 15 E pro ml Plasma gemessen. Die Halbwertszeit für die Elimination der Streptokinase nach Beendigung der Infusionstherapie lag bei 18 min. Der Verfall von 5 E Streptokinase pro ml Plasma wurde über einen unterschiedlichen Zeitraum (15 und 60 min, 24 und 48 Std) und Inkubation bei Zimmertemperatur und +37° C untersucht. Es zeigte sich, daß bei Zimmertemperatur eine schnelle Verarbeitung zur Vermeidung von Aktivitätsverlusten notwendig ist. Im eingefrorenen Zustand geht keine Streptokinase verloren.
    Notes: Summary A method of a quantitative determination of plasma streptokinase concentrations in patients undergoing streptokinase infusion is described. The principle of this method is based on the clot lysis time recorded by the thromboelastograph. The test clot constituents were bovine fibrin, bovine plasminogen, human euglobulin, EDTA, human plasma (of unknown streptokinase quantity) and thrombin. As rather high concentrations (fixed excess) of plasminogen (euglobulin) and fibrinogen were present in the test coagulum, no interference with changing plasminogen and fibrinogen levels of the patient's plasma was observed. Furthermore, due to high EDTA concentrations, no interaction with platelet functions and coagulation factors took place. The standard deviation in measuring 2 u streptokinase in 1 ml human plasma was determined ass=±0.19 u/ml, of 5 u streptokinase ats=±0.47 u/ml and of 20 u streptokinase ats=±2.5 u in 1 ml of human plasma. Plasma samples of patients undergoing fibrinolytic treatment were investigated with regard to their streptokinase content. Streptokinase concentration values varied between 0.7 u and 15 u/ml plasma. The average half life of streptokinase in the organism was 18 min. The decay of streptokinase in plasma at different temperatures and over various periods of time was also determined. A considerable loss of streptokinase in the plasma during storage at room temperature could be observed. Therefore, the determination procedures should be carried out without delay.
    Type of Medium: Electronic Resource
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