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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 61 (1983), S. 703-708 
    ISSN: 1432-1440
    Keywords: Liver cirrhosis ; Thrombocytopenia ; DIC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Besides decreased platelet production and an increased platelet sequestration in the spleen chronic DIC is thought to cause thrombocytopenia in chronic liver diseases. To investigate if this mechanism could play a role in patients with severe, but stable hepatic cirrhosis, we studied 32 pts. Twenty-eight of them had portal hypertension, 22 had bleeding episodes from oesophageal varices. To evaluate platelet activity, thrombin generation and fibrinolytic activity in vivo, plasma and platelet levels ofβ-thromboglobulin (β-TG) and platelet factor 4 (PF4) as well as fibrinopeptide A (FPA) and the fibrinogen degradation product FCB-3, generated by the action of plasmin, were determined radioimmunologically. Plasma levels and platelet content of serotonin (5-HT) were measured fluorometrically. The mean platelet count/µl was reduced in pts. (109.000±67.000) compared to a control group (n=25, 264,000±52,000,p〈0.001). Factor VII (45±20%), prothrombin time (63±16%) AT-III activity (65±19%) and AT-III concentration (67±23%) were decreased in the pts'. group (p〈0.01). In contrast, plasma levels ofβ-TG (17±7 ng/ml) and of PF4 (4±2 ng/ml) as well as platelet content (µg/109 platelets) ofβ-TG (59±18), PF4 (21±6) and 5-HT (400±210) were found to be in the normal range. Neither mean FPA plasma concentration (3±2 ng/ml) nor mean FCB-3 scrum level (11±5 pmol/ml) differed significantly from controls. Our results demonstrate that pts. with thrombocytopenia and stable hepatic cirrhosis do not have evidence of chronic DIC, primary fibrinolysis or increased platelet activity in vivo. However, our results are compatible with increased platelet sequestration in the spleen and/or decreased platelet survival due to faster extravascular platelet clearance, or decreased platelet production within the bone marrow.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Estradiol-17β and [4-14C]estradiol-17β in total mass amounts of 0, 10 and 20 pg per analysis in the presence of 1000 pg [2H8]estradiol as an internal standard were simultaneously quantitatively determined by gas chromatography mass spectrometry using the selected ion monitoring technique. The experiment (a nested three way analysis of variance) was designed to investigate the two-dimensional error structure which facilitates the study and comparison of the variances: (1) the variance originating in the device, including gas chromatograph, mass spectrometer and computer system with its interfaces; (2) the variance originating from titration, pipetting and derivatization of the samples. The study revealed that in this concentration range the variance due to sample preparation is smaller than that due to the device. The deviations due to the device were shown to have a two-dimensional normal distribution.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1980), S. 273-276 
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method is proposed for the quantitative estimation of a substance and its labelled analogue using the selected ion monitoring technique of gas chromatography mass spectrometry, in which estimation is achieved without a third labelled analogue as internal standard. In a first measurement the ratio of natural to labelled substance is estabolished. Then a known amount of either labelled or natural compound is added, the isotope ratio is determined a second time and from these two measurements the mass amounts can be calculated. When applied to the heptafluorobutyrates of androstenedione and progesterone about 10 pg of 14C labeled compounds can be determined in the presence of 1 ng of the natural substances.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 530 (1985), S. 43-59 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal-rich Gadolinium Hydride HalidesPreparation, structures, and thermal behaviour of gadolinium hydride halides GdXHn (X = Cl, Br, I; 0.7 〈 n 〈 0.9) are described. The preparation is done by heating Gd, GdH2, and GdX3 in sealed Ta ampoules to 900°C and 950°C. The arrangement of the heavy atoms corresponds to the 3 slab (X—Gd—Gd—X) structures of ZrCl and ZrBr. Besides these, a new stacking variant containing only 2 slabs in the identity period (2s-GdBrH0·69 and 2s-GdIH0·80; nomenclature of niobium dichalcogenides) is found.
    Notes: Darstellung, Strukturen und thermisches Verhalten der Gadoliniumhydridhalogenide GdXHn (X = Cl, Br, I; 0,7 〈 n 〈 0,9) werden beschrieben. Sie werden durch Erhitzen von Gd, GdH2 und GdX3 in verschweißten Ta-Ampullen auf 900°C bzw. 950°C dargestellt. Die Anordnung der Schweratome entspricht der in ZrCl bzw. ZrBr mit der Stapelung von drei X—Gd—Gd—X Schichtpaketen innerhalb der Identitätsperiode. Daneben wird eine neue Strukturvariante mit der Stapelung von nur zwei Schichtpaketen X—Gd—Gd—X gefunden (2s-GdBrH0,69 bzw. 2sGdIH0,80; Bezeichnung in Anlehnung an die Nomenklatur der Strukturpolymorphen bei Niobdichalkogeniden).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 48 (1976), S. 1223-1224 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 21 (1908), S. 252-255 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The use of a model developed by the authors for the simultaneous quantitative determination of several isotopically labelled substances of the same chemical structure is described in detail for a two substance system. A computational flow chart is included. An example using natural estradiol and 4-[14C] labelled estradiol with manifold deuterated estradiol as an internal standard is presented. The basis of the model is discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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