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  • 1980-1984  (4)
  • Chemistry  (3)
  • Animals  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of toxicology 45 (1980), S. 81-92 
    ISSN: 1432-0738
    Keywords: Beryllium ; Blood analyses ; Immunology ; Human ; Animals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zur Frage der Dosis-Wirkungs-Relation der Berylliose wurde sowohl der Verlauf der Be-Konzentration in Blut und Urin, als auch das immunologische Verhalten der T-Lymphozyten bei einer Gruppe beruflich exponierter Menschen (〈 8 ng Be/m3, 4–6 h täglich) und einer nichtexponierten Kontrollgruppe geprüft. Mit Hilfe der optimierten flammenlosen Atomabsorptionsspektrometrie wurden als Normalwerte l,0 ± 0,4 ng Be/g (n = 10) in Blut und 0,9 ± 0,5 ng Be/g (n = 10) in Urin gefunden. Die exponierte Gruppe (n = 8) wies einen mittleren Anstieg um das 4fache auf. Die bevorzugte Anreicherung des Berylliums im Präalbumin- undγ-Globulinbereich wurde mit einer speziell entwickelten präparativen Isotachophoresesäule mit physiologischen Trenn-pH-Bedingungen nachgewiesen. Die Prüfung der spezifischen Stimulation der T-Lymphozyten ergab gegenüber der Kontrollgruppe eine signifikant erhöhte Transformationsrate. Die Untersuchung von Blut- und Urinproben Be exponierter Wistarratten und Meerschweinchen (2–40 mg Be/m3 als Be(NO3)2-Aerosol) ergab Be-Werte im Serum bis 36 ng Be/g, in Urin bis 300 ng Be/g. Die Menge der isotachophoretisch getrennten Fraktion derγ-Globuline von Meerschweinchen war nach der Exposition erhöht und nicht mit erhöhten Be-Gehalten in dieser Fraktion korrelierbar. Wie bei der in vitro-Zugabe von Be zu Vollblut befand sich das Be (10–100 ng/g Serum) zu 70% in der Präalbuminfraktion und nur zu etwa 1% imγ-Globulin. Die Lymphozytentransformationsrate war bei exponierten Tiergruppen erhöht, die zusätzlich durchgeführten Hautteste waren bei Ratten zu 70% und bei Meerschweinchen zu 50–70% positiv.
    Notes: Abstract The question of dose-effect relations of berylliosis was examined by measuring the Be-concentration in blood and urine, as well as the immunological behaviour of T-lymphocytes for a group of occupationally exposed men (〈 8 ng Be/m3,4–6 h daily) and a non-exposed control group. Normal values 1.0 ± 0.4 ng Be/g(n = 10) in blood and 0.9 ± 0.5 ng Be/g(n = 10)in urine were found by an optimized flameless atomic absorption spectrometry method. The corresponding values for the exposed group (n = 8) showed a mean increase of a factor of 4. The preferential enrichment of Be in the prealbumin and in theγ-globulin fractions was determined by a preparative isotachophoretic column with physiological pH conditions, especially developed for this application. The Be-specific stimulation of the T-lymphocytes of the exposed group was increased significantly. In blood and urine samples of exposed (2–40 mg Be/m3 as Be(NO3)2)Wistarrats and guinea pigs Be values up to 36 ng Be/g in serum and up to 300 ng Be/g in urine were determined. After Be exposure, guinea pig serum showed a significant increase in theγ-globulins after the isotachophoretical separation of the serum proteins, which could not be correlated with increased Be-levels in this fraction. 70% of the total Be (10–100 ng/g serum) were detected in the prealbumin, only about 1% in theγ-globulin fraction. The same results were found in serum samples with in vitro addition of He. The lymphocyte transformation rates for the exposed animals were increased. Skin tests were found to be positive in 70% for exposed rats and in 50–70% for guinea pigs.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 101-110 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A New Synthesis of 6H-1,3-ThiazinesA new method for the synthesis of 1,3-thiazines is described. The addition of nucleophiles to γ-isothiocyanatoallylchlorides (1a-j) leads to functionalisation and subsequent cyclisation (nucleophilic cyclofunctionalisation). Reaction of secondary amines or alcohols under catalysis by tert. amines gives numerous 2-dialkylamino- (3a-w) or 2-alkoxy-6H-1,3-thiazines (4a-p).
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 433-442 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Characterization of Polychlorinated IsobutenesThe preparation of polychlorinated methallylic chlorides by continuous chlorination of isobutene with different ratios of chlorine and following HCl-elimination is described. The structure is proved by reaction of the polychlorinated isobutenes with sodium thiolacetate and potassium thiocyanate and by spectroscopic methods.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 629-637 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Characterisation of VinylisothiocyanatesThe preparation of vinylisothiocyanates by treatment of γ-chloroallylchlorides with KSCN followed by rearrangement of the γ-chloroallylthiocyanates is described. The structure is proved by the reaction of the vinylisothiocyanates with mercaptides and by spectroscopic methods.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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