Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 96 (1986), S. 1-10 
    ISSN: 1437-1596
    Keywords: Carbon monoxide ; Effects on hepatic mitochondrial function ; Cyanide effects on hepatic mitochondrial function ; Kohlenmonoxid, Funktionsstörung der Mitochondrien ; Zyanid, Funktionsstörungen der Mitochondrien
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Der Einfluß von Kohlenmonoxid und Blausäure auf die Funktion der Lebermitochondrien wurde untersucht. Alle Versuche wurden an Ratten in Pentobarbitalnarkose durchgeführt. Unmittelbar nachdem die Bauchhöhle der Ratten geöffnet wurde, wurden einzelne Tiere in einer Versuchskammer aus transparentem Kunststoff für 3min einem Prüfungsgas ausgesetzt. Jedes Prüfungsgas wurde in einer durch ein Plastikrohr mit der Versuchskammer verbundenen Gaskammer hergestellt. HCN wurde aus NaCN und H2SO4 hergestellt. Bei CO-Versuchen wurden verschiedene Mengen von CO in die Kammer eingeführt. Unmittelbar nach den Versuchen wurden etwa 2g Leber in situ mit einer abgekühlten Klemme gefroren. Eine Blutprobe wurde von der Wunde entnommen. Die Konzentrationen des Azetoazetats, β-Hydroxybutyrats, Adenosintriphosphats, Adenosindiphosphats und Adenosinmonophosphats der Leber wurden bestimmt, und anhand von ihren Werten wurden “redox state” (ein Verhältnis von Azetoazetats zu β-Hydroxybutyrats) und “energy charge” (ein Verhältnis von Summa von ATP und 0.5 ADP zu Summa von ATP, ADP und AMP) berechnet. In vergifteten Ratten verminderten sich “redox state” mit der zunehmenden Konzentration der Toxika im Blut. Als die HbCO-Konzentration 40% überstieg, trat eine Art Wende, bei der die Geschwindigkeit der Verminderung sich reduziert, ein. Für Zyanid war diese Wende 2.0μg/ml. Im Vergleich zu “redox state” verminderte sich “energy charge” langsamer. Aber die Geschwindigkeit der Verminderung beschleunigte sich, wenn die Blutkonzentration der Toxika eine Grenze überschritt. Die o.g. Wenden waren 40% für HbCO und 2.0μg/ml für Zyanid. In kombinierten Versuchen wurden Tiere einem Gasgemisch (CO und niederer Konzentration von HCN) ausgesetzt. Es wurde angenommen, daß es keine Wechselwirkung zwischen CO und HCN gibt.
    Notes: Summary The effects of carbon monoxide and cyanide on the hepatic redox state and energy charge were investigated. Rats were used for the experiment under pentobarbital anesthesia. Immediately after laparotomy, a rat was placed in an animal chamber made of a transparent plastic box and exposed to a test gas for 3 min. Every test gas was produced in a gas chamber connected to the animal chamber with a flexible tube. HCN was produced from NaCN and H2SO4. In the CO inhalation experiment, various amounts of CO were introduced into the gas chamber. Immediately after an exposure, about 2g liver was frozen in situ with a precooled clamp. Oozed blood from the wound surface was sampled. Concentrations of ATP, ADP, AMP, acetoacetate, and β-hydroxybutyrate in hepatic mitochondria were determined, and the redox state and the energy charge were calculated. For cyanide as well as CO, significant negative correlations were found between the concentration in the blood and the redox state. The same held true for the energy charge. The redox state showed a slight increase at low concentrations of both gases; however, thereafter it began to decrease sharply with increases in concentrations. When concentrations of the toxicant in the blood reached certain levels, a kind of turning point, beyond which the redox state does not decrease any more, was observed. It was about 40% for HbCO and about 2.0μg/ml for cyanide, and the points seemed to be related to the concentrations, beyond which cells are irreversibly damaged. On the other hand, the energy charge did not change at low concentrations. With an increase in toxicant concentrations, the energy charge decreased drastically. The rate of decrease in the energy charge became higher when blood concentrations exceeded certain levels. It was about 40% for HbCO and 2.0μg/ml for cyanide. The presence of low levels of blood cyanide did not affect the relationship between the energy charge and the HbCO concentration.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 187 (1987), S. 105-117 
    ISSN: 1433-8580
    Keywords: Primary culture of adult rat hepatocytes ; Barbituric acid derivatives ; Hepatocyte survival ; Albumin secretion ; Tyrosine aminotransferase activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Eighteen barbituric acid (BA) derivatives and three structurally related chemicals (non-BA-derivatives) were tested for their potency in supporting survival of functional hepatocytes from adult rats in primary culture. Of the 18 BA derivatives, nine drugs showed excellent maintenance effect on hepatocyte survival and function. Although four BA derivatives were also effective, their potency was relatively lower. The remaining five BA derivatives and three structurally related chemicals exhibited no maintenance effect. Thus, a correlation was found between the BA derivative structure and the potency for supporting hepatocyte survival in primary culture. The dose response curves of hepatocyte survival were generally biphasic in shape, as a function of BA derivative concentration. The optimum concentrations for observing the morphological and biochemical effects of the BA derivatives differed from each other. The maintenance of hepatocytes was attained only in the continuous presence of the BA derivatives in the medium. The nine excellent BA derivatives efficiently prevented hepatocytes from morphological degeneration which was observed in the control cultures. The surviving hepatocytes in the presence of these BA derivatives showed higher albumin secretion and retained higher basal levels of tyrosine aminotransferase (TAT) activity for at least 2 weeks in primary culture, as compared with control. Furthermore, the addition of dexamethasone (10 µM) caused a 2- to 4-fold induction of TAT activity for at least 2 weeks in primary culture.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 73 (1987), S. 177-180 
    ISSN: 1432-0533
    Keywords: Lectins ; Polyglucosan bodies ; Dog
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Lectin histochemistry was investigated to identify sugar residues of the polyglucosan bodies of canine brain, spinal cord and caecum. The polyglucosan bodies in the brain and spinal cord stained with concanavalin A (ConA) but not with soybean agglutinin, wheat germ agglutinin, peanut agglutinin,Dolichos biflorus agglutinin,Ricinus communis agglutinin andUlex europaeus agglutinin. Caecum, polyglucosan bodies, however, did not stain with any of the seven lectins employed. After periodate oxidation, paradoxical ConA staining was observed in the polyglucosan bodies of the brain, spinal cord and caecum. These results indicate that polyglucosan bodies contain mannose and glucose residues and suggest that the component of polyglucosan bodies is partially derived from rough endoplasmic reticulum, the Golgi apparatus and hypolemmal cisternae.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...