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  • 1
    ISSN: 1432-1440
    Keywords: Hemostasis ; Platelet aggregation ; Thromboxane ; Diabetes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Coagulation parameters, platelet aggregation, and thromboxane production as well as metabolic parameters were measured in 31 diabetic patients, 12 without and 19 with clinically manifest late complications, and in 14 healthy control subjects. Spontaneous in vitro aggregation as well as ADP, collagen, and arachidonic acid induced aggregation were higher in both groups of diabetic patients, without an increase in thromboxane B2 production. In diabetic patients with late complications an increase in fibrinogen, fibrinogen cyanogen bromide peptide, factor VIII related antigen, C1-esterase inhibitor, and antithrombin III was observed in comparison to healthy subjects. Fibrinogen, C1-esterase inhibitor, and factor VIII related antigen were already elevated in diabetic patients without clinically manifest late vascular complications. No strict correlations were found between serum glucose, glycosylated hemoglobin, and glycosylated albumin, on the one hand, and coagulation promoting or inhibiting factors, aggregation or thromboxane B2 production, on the other, in either control or diabetic subjects. Also no correlations existed between the coagulation parameters and the aggregation results. In vitro incubation of pooled normal plasma with different glucose concentrations had no influence on the methods by which the coagulation parameters were measured. These data indicate that rather early in the diabetic state many changes take place in different phase of the thrombostatic process, all resulting in an increased hemostatic diathesis.
    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
    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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  • 5
    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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  • 6
    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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  • 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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