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  • Electronic Resource  (5)
  • 1995-1999
  • 1970-1974  (5)
  • 1974  (3)
  • 1971  (2)
Material
  • Electronic Resource  (5)
Years
  • 1995-1999
  • 1970-1974  (5)
Year
  • 1
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 282 (1974), S. 9-14 
    ISSN: 1432-1912
    Keywords: Cardiac Glycosides ; Distribution ; Guinea Pigs ; Protein Binding ; Therapeutic Ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In guinea pigs under urethane anaesthesia the concentrations of radioactivity in the plasma, the liver and the heart and the protein binding of radioactivity were measured 1 h after the intravenous injection of 0.2 μmoles/kg β-methyldigoxin or digoxin. The distribution coefficients were calculated between the concentrations in the plasma water and the tissues. Apart from a slightly higher distribution coefficient for β-methyl-digoxin than for digoxin between liver and plasma water there was no significant difference between the two glycosides. In guinea pigs under barbital anaesthesia, cardiac failure was produced by additional doses of barbital-Na. Bemegride was given to counteract the effects of barbital on the vasomotor centre. β-Methyl-digoxin and digoxin were infused until cardiac arrest. For each animal the doses were calculated which led to an increase in cardiac performance by 50 g · cm/sec, arrhythmia, ventricular fibrillation or cardiac arrest. The therapeutic range was calculated from the doses producing arrhythmias and those increasing cardiac performance by 50 g · cm/sec (“therapeutic” dose). There was no difference between the “therapeutic” and toxic doses and the therapeutic ratios of β-methyl-digoxin and digoxin.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 4 (1971), S. 32-37 
    ISSN: 1432-1041
    Keywords: Glibenclamide ; pharmacokinetics ; metabolism ; potentiation of hypoglycemic action ; phenylbutazone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Summary Metabolically healthy subjects were given an intravenous injection of 1,13 mg14C-labelled glibenclamide (HB 419). The plasma level, renal elimination of the radioactivity and metabolism of the substance were investigated. Two minutes after administration the HB 419 is virtually present only in the blood and at the end of the distribution period mostly in the extracellular space. 53% of the radioactivity is excreted via the kidneys in the form of metabolites. If glibenclamide is administrated in the same way to the same subjects after pretreatment with phenylbutazone there are no differences in the course of the plasma levels or the rate of elimination from the blood. There is, however, a significant difference in the excretion of the radioactivity in the urine. In the presence of phenylbutazone significantly less HB 419 metabolite is excreted renally. In view of the known alternative route of elimination it is suggested that the amount not excreted in the urine is in compensation eliminated via the bile. There was no difference in the metabolism of glibenclamide between the control and phenylbutazone treated groups. The potentiation by phenylbutazone of HB 419 action, and probably also that of other antidiabetic sulphonylureas, must therefore be due predominantly to other causes (Communication III).
    Notes: Zusammenfassung Stoffwechselgesunde Versuchspersonen erhielten14C-markiertes Glibenclamid in einer Dosis von 1.13 mg/Vpn i.v. gespritzt. Plasmaspiegelverläufe, renale Elimination der Radioaktivität und die Metabolisierung der Substanz wurden untersucht. Zwei Minuten nach der Applikation ist HB 419 praktisch nur im Blutund nach Abschluß der Verteilung weitgehend im Extracellulärraum vorhanden. 53% der Radioaktivität werden über die Nieren in Form von Metaboliten ausgeschieden. Wird den gleichen Probanden nach Prämedikation mit Phenylbutazon Glibenclamid in gleicher Weise verabfolgt, ergibt sich kein Unterschied hinsichtlich der Plasmaspiegelverläufe und der Eliminationsgeschwindigkeit aus dem Blut. Ein signifikanter Unterschied besteht jedoch in der Ausscheidung der Radioaktivität in den Harn (26.3%). In Gegenwart von Phenylbutazon wird ein signifikant geringerer Anteil von HB 419-Metaboliten renal eliminiert. Aufgrund des bekannten zweiten Ausscheidungsweges wird vermutet, daß der fehlende Anteil kompensatorisch über die Galle eliminiert wird. Die Metabolisierung von Glibenclamid weist keine Differenzen zwischen Phenylbutazon-und Kontroll-Gruppe auf. Die Wirkungspotenzierung von HB 419 — wahrscheinlich auch diejenige anderer antidiabetisch wirksamer Sulfonylharnstoffe — durch Phenylbutazon dürfte demnach überweigend andere Ursachen haben. (Mitteilung III).
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 286 (1974), S. 195-210 
    ISSN: 1432-1912
    Keywords: Cats ; Cardiac Glycosides ; Inotropic Action ; Distribution ; Protein Binding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The tissue distribution and the positive inotropic effect of α- and β-methyl-digoxin, digoxin, and digitoxin were investigated in cats under pentobarbital anaesthesia, the emetic effect of β-methyl-digoxin and digoxin in unanaesthetized animals. 1. The distribution volume calculated by dividing the injected dose by the concentration in the plasma water after 60 min decreased in the order digitoxin 〉 β-methyl-digoxin ≥ α-methyl-digoxin 〉 digoxin. 2. The distribution coefficients between tissue and plasma water decreased for all glycosides in the order kidney 〉 liver 〉 heart 〉 diaphragm 〉 erythrocytes 〉 perirenal fat 〉 brain. 3. α-Methyl-digoxin and digoxin were metabolized to a larger extent than were β-methyl-digoxin and digitoxin. 4. 200 nmoles/kg digoxin produced arrhythmias, whereas equimolar doses of the other glycosides were well tolerated. 5. Except for α-methyl-digoxin, there was a close relation between the increase in dp/dt max and the concentration in the plasma water 60 min after the injection. The differences in the equieffective doses of β-methyl-digoxin, digoxin, and digitoxin can therefore be explained by the differences in tissue distribution. 6. Although higher concentrations of β-methyl-digoxin than of digoxin were found in the brain, there was no difference in the central activity of the two glycosides.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 257 (1971), S. 257-264 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der Einfluß der Probenstruktur und der unterschiedlichen Phasen in der Oberfläche von Eisen- und Stahlproben auf das emissionsspektrometrische Ergebnis wurden unter Verwendung einer Bornitrid-Blende und bei konstanten Verfahrensbedingungen untersucht. Aus diesen Untersuchungen läßt sich folgern, daß es beim Vorliegen nichtoptischer Interelementeffekte notwendig ist, die Auswertung der Meßergebnisse zum Endresultat über Grundeichkurven vorzunehmen und eine schrittweise Regression auf diese durchzuführen.
    Notes: Abstract By using a blind of boron nitride and constancy conditions of spectrometric analysis the influence of the structure and different phases in the surface of iron and steel samples on spectrometric results are examined. This investigation of not-optical interelement effects comes to the conclusion, that it will be necessary to get the full result from basic calibration curves in combination with stepwise regression calculations.
    Type of Medium: Electronic Resource
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