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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 187 (1987), S. 385-393 
    ISSN: 1433-8580
    Keywords: Acute myocardial infarction ; Adrenaline ; Platelet factor 4 ; β-Thromboglobulin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary It is known that in most cases of transmural acute myocardial infarction a platelet clot originates within a coronary artery. In acute myocardial infarction patients increased levels of the plasma catecholamines adrenaline and noradrenaline as well as the platelet release proteins platelet factor 4 andβ-thromboglobulin have been reported. In this study, significantly higher values were found of platelet factor 4 (P 〈 0.0001) andβ-thromboglobulin (P 〈 0.002) in 17 acute myocardial infarction patients as compared to 17 control patients (on intensive care due to non-cardiac disorders), while the plasma levels of adrenaline and noradrenaline were not different. Positive correlations were obtained between the two catecholamines and the platelet products in the control group and between adrenaline and both platelet factor 4 (r = 0.715,P 〈 0.01) andβ-thromboglobulin (r = 0.547,P 〈 0.05) in the acute myocardial infarction patients. The data suggest that a stimulation of the platelets by adrenaline may facilitate in vitro activation during sampling in patients with high catecholamine load. On the other hand, a “preactivation” of the platelets by an increase of adrenaline might be of significance for thrombus formation in acute myocardial infarction.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Coenzyme fluorescence spectra of single living cells are due to free pyridine nucleotides (folded configuration), bound pyridine nucleotides (unfolded configuration) and a third component, possibly a mixture of flavins. Such spectra can be used to recognize possible differences in coenzyme composition between cell lines or changes of metabolic pathways due to chemicals acting at levels below or above cytotoxicity, by high resolution spectrofluorometry. A study of spectra recorded from cultured Ehrlich ascites (EL2), and Harding Passey melanom a cells (HPM-67 and HPM-73 line) grown under comparable conditions, shows that free NAD(P)H predominates in HPM-67 and EL2, while this coenzyme is bound in HPM-73. The free/bound ratio may be profoundly modified by chemicals, e.g. in the HPM-73 increase of free and decrease of bound NAD(P)H occurred upon treatment with 10−6 oligomycin. When atebrine at levels (10−6 M) below cytotoxicity was added, there was a decrease of the free NAD(P)H spectrum possibly through energy transfer from NAD(P)H to atebrine. Consideration of long range energy transfer i.e., excitation of atebrine by fluorescence of NAD(P)H vs. short range transfer of excitation energy from free NAD(P)H to atebrine, favors the latter mechanism. A transient (reversible) increase in atebrine fluorescence is seen following intracellular microinjection of substrate (e.g. glucose-6-P) leading to an increase in free NAD(P)H. At cytotoxic levels of atebrine (e.g. 2×10−5 M) an irreversible increase of atebrine fluorescence is seen. The microspectrofluorometric technique appears therefore well suited to study physiological processes at the level of intracellular coenzymes, as well as possible processes of intermolecular energy transfer in the microenvironment.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1440
    Keywords: Small intestine ; Absorption ; Glucagon ; Man ; Dünndarm ; Resorption ; Glucagon ; Mensch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Einfluß von Glucagon auf die Resorption von Glucose, Wasser, Natrium und Kalium wurde mittels der segmentalen Dünndarmperfusion mit einer dreilumigen Sonde im oberen Jejunum bei 1) stoffwechselgesunden Probanden, 2) Altersdiabetikern mit verminderter Insulinsekretion nach Glucagongabe, 3) insulinbedürftigen Diabetikern vom Typ des juvenilen Diabetes mellitus untersucht. Nach Messung der Resorption über zwei 30 min-Perioden wurde den Probanden 1 mg Glucagon intravenös injiziert und danach die Resorption über vier 15 min-Perioden ermittelt. Ergebnisse: Nach der Glucagongabe trat in allen drei Gruppen zunächst ein kurzdauernder Anstieg der Glucoseresorption auf. Dieser war bei den Diabetikern stärker als bei den stoffwechselgesunden Probanden. Anschließend kam es zu einer signifikanten Resorptionsminderung für Glucose. Die Wasser- und Natriumresorption wurden durch Glucagon gehemmt, Kalium wurde ins Darmlumen sezerniert.
    Notes: Summary Jejunal absorption of glucose, water, sodium and potassium was investigated under the influence of intravenously injected glucagon. This was done in 1) metabolically healthy adults, 2) patients with growth onset diabetes and reduced insulin secretion after glucagon, 3) patients with juvenile onset diabetes who do not secrete insulin after glucagon injection. A triple lumen perfusion technique was used. Results: There is an initial short lasting increase of glucose absorption after glucagon administration in all three groups investigated. This was more pronounced in the diabetics than in the metabolically healthy adults. In a second phase, which was most marked 30–45 minutes after glucagon administration, a significant decrease of glucose absorption was seen. Sodium and water uptake were reduced after glucagon administration and potassium was found to be secreted into the lumen.
    Type of Medium: Electronic Resource
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