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  • 1
    Electronic Resource
    Electronic Resource
    Acetyl-coenzyme A: arylamine N-acetyltransferases in microorganisms: screening and isolation of an enzyme from Bacillus cereus (1986)
    Springer
    Archives of microbiology 146 (1986), S. 275-279 
    Details
    ISSN: 1432-072X
    Keywords: Arylamine N-acetyltransferase ; Metabolism of aromatic amines ; Soil microorganisms ; Bacillus cereus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The raw extracts of a series of microorganisms were screened for the presence of acetyl-coenzyme A: arylamine N-acetyltransferase (AAAT) using a radioactive assay with 3H-acetyl-coenzyme A and aniline as substrates. Enzyme activities were primarily detected in the soluble fractions of Bacillus and Nocardia species, and in some further soil organisms. Only strains of Bacillus cereus were able to acetylate 4-nitroaniline and 3,5-dimethyl-4-nitroaniline. The fermentation conditions for the production of the enzyme were optimized. The AAAT from one strain of Bacillus cereus was purified 24-fold and characterized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00403229
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of fibronectin therapy and fibronectin deficiency on healing of rat burns and excision wounds (1987)
    Springer
    Research in experimental medicine 187 (1987), S. 217-223 
    Details
    ISSN: 1433-8580
    Keywords: Wound healing ; Rats ; Fibronectin ; Gelatin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Rats with standardized burns and skin excision wounds were treated i.p. with human fibronectin or swine skin gelatin. Controls received bovine albumin, solvent, or no treatment. Wound healing was assessed by planimetry, additionally plasma fibronectin was determined. Solvent or albumin did not influence the healing process, neither did fibronectin. However, when opsonizing fibronectin was additionally consumed by application of gelatin, a significant retardation of wound healing was observed. The results support the opinion that fibronectin is of essential importance for post-traumatic opsonization of gelatin-like material originating from the damaged tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01852086
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  • 3
    Electronic Resource
    Electronic Resource
    Transformation of the Fusarium mycotoxin zearalenone in maize cell suspension cultures (1988)
    Springer
    Naturwissenschaften 75 (1988), S. 309-310 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367324
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  • 4
    Electronic Resource
    Electronic Resource
    254. Welche Diagnostik bei Verdacht auf Appendicitis? (1986)
    Springer
    Langenbeck's archives of surgery 369 (1986), S. 782-783 
    Details
    ISSN: 1435-2451
    Keywords: Diagnostic variables ; Accuracy ; Predictive value ; Diagnosekriterien ; Treffsicherheit ; Vorhersagewahrscheinlichkeit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ca. 100 Jahre nach der ersten elektiven Appendektomie bestehen weiterhin oft Unsicherheiten in der Diagnose der Appendicitis, erkennbar an zu häufigen fehlinduzierten Laparotomien. Mittels einer prospektiven Untersuchung bei 75 Patienten wurden die üblichen diagnostischen Tests und anamnestischen Angaben untersucht (Sensivität, Spezifität, pos. Vorhersagewahrscheinlichkeit). DieKombination von 〉 10,000 Leukocyten/μm und Übelkeit zeigte eine hohe Treffsicherheit: Sensitivität 83%. Spezifität 87%, positiv 77%. Von nur 6 falsch positiven Fällen bestand bei 5 hingegen dennoch eine anders begründete Operationspflicht.
    Notes: Summary About 100 years after Morton's first elective appendectomy, it is still desirable to achieve greater accuracy in the diagnosis of appendicitis and thus avoid unnecessary laparotomies. A prospective study of 75 patients evaluated the common diagnostic tests and variables (e.g. sensitivity, specificity, and predictive values) in patients' histories. Thecombined presence of 〉 10,000 leukocytes/gmm and nausea was found to be most valuable: (sensitivity, 83% ; specificity, 87% ; positive predictive value, 77%). Of only six incorrectly diagnosed cases, five still required operative therapy for other conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01274573
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  • 5
    Electronic Resource
    Electronic Resource
    Über den Anionenaufbau wäßriger Tetra-n-propyl- und Tetraethylammoniumsilicatlösungen (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 521 (1985), S. 61-68 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Anion Constitutions of Aqueous Tetra-n-propylammonium and Tetraethylammonnium Silicate SolutionsThe constitution of the silicate anions present in 0.1 M to 3 M tetrapropylammonium-(TPA-) and tetraethylammonium-(TEA-)silicate solutions with molar TPA/Si ratios of 3, 1 and 0.6 and TEA/Si ratios of 3 and 1 is investigated by means of trimethylsilylation. Up to 16 different oligomeric silicate anions are detected and estimated quantitively. Type and quantitative dis-tribution of the silicate anions are very similar in diluted 0.1 M TEA- and TPA-silicate solutions. Concentrated TEA-silicate solutions contain preferably Si6O156- anions whereas concentrated TPA-silicate solutions are characterized by a broad distribution of different oligomeric silicate anions. The anion distribution of TPA- and TEA -silicate solutions is compared with the results of tetramethyl- and tetrabutylammonium silicate solutions studied previously.
    Notes: Mit Hilfe der Trimethylsilylierung wurden Untersuchungen zum Anionenaufbau 0,1 M bis 3 M Tetrapropylammonium-(TPA-) und Tetraethylammonium-(TEA)- Silicatlösungen mit molaren TPA/Si-Verhältnissen von 3; 1 und 0,6 bzw. Tea/Si-Verhältnissen vo 3 und 1 durchgeführt. In Abhängigkeit vom vom Molverhältnis und der SiO2-Konzentration wurden bis zu 16 verschiedene oligomere Silicatanionentypen nachgewiesen und Quantitativ bestimmt. Bei gleichen Molverhältnissen zeigen verdünnte 0,1 M TEA- und TPA-Silicatlösungen einen nahezu identischen Anionenaufbau. In konzentrierten TEA-Silicatlösungen werden bevorzugt Si6O156--Anionen gebildet, während in TPA-Silicatlösungen eine breite Verteilung oligomerer Silicatanionen ohne Bevorzucatlösungen wird im Zusammenhang mit dem Anionenaufbau entsprechender Tetramethylammonium- und Tetrabutylammoniumsilicatlösungen diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855210209
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  • 6
    Electronic Resource
    Electronic Resource
    [(CH3)3Si]14Si7O21 - ein neuer cyclischer Kieselsäuretrimethylsilylester (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 524 (1985), S. 51-58 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [(CH3)3Si]14Si7O21  -  A New Cyclic Silicic Acid Trimethylsilyl EsterA new silicic acid trimethylsilyl ester was obtained by trimethylsilylation of barium chloride silicate 2 BaO · 3 BaCl2 · 2 SiO2. The ester was investigated by capillary gas chromatography, mass spectrometry, 29Si n.m.r. spectroscopy, and thinlayer chromatography and was found to be a cycloheptasilicic acid trimethylsilyl ester (tetradecakis-trimethylsiloxicyclohepta siloxane) of the formula [(CH3)3Si]14Si7O21. The application of the new compound as a standard substance is discussed.
    Notes: Durch Trimethylsilylierung des Bariumchloridsilicats 2BaO · 3 BaCl2 · 2SiO2 wurde ein bisher unbekannter Kieselsäuretrimethylsilylester hergestellt, der mit Hilfe der Kapillargaschromatographie, Massenspektroskopie, 29Si-NMR-Spektroskopie und Dünnschichtchromatographie charakterisiert wurde. Aus den Untersuchungen folgt für den Ester die Konstitution eines Cycloheptakieselsäuretrimethylsilylesters (Tetradecakistrimethylsiloxicycloheptasiloxan) der Formel [(CH3)3Si]14Si7O21. Die Verwendung des Esters als Standardsubstanz wird diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855240507
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  • 7
    Electronic Resource
    Electronic Resource
    Zum Aufbau schlecht geordneter Calciumhydrogensilicate. VII. 29Si-NMR-Untersuchungen an C—S—H(Di, Poly) (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 528 (1985), S. 147-151 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of Ill-crystallized Calcium Hydrogen Silicates. VII. Solid State 29Si N.M.R. Studies on C—S—H(Di, Poly)High-resolution solid-state MAS 29Si n.m.r. studies prove that C—S—H(Di, Poly) contains end and middle group SiO4 tetrahedra (di- and polysilicate) only. Further on it is shown that the ratio of OH groups linked to polysilicate to such linked to disilicate anions is constant in the region 1-1.5 CaO/SiO2 but decreases with increasing temperature of formation of C—S—H(Di, Poly).
    Notes: Mittels hochauflösender 29Si-Festkörper-NMR unter Anwendung der MAS-Technik wird gezeigt, daß C—S—H(Di, Poly) entsprechend einem früher entwickelten Strukturvorschlag [1] nur end- und mittelständige SiO4-Tetraeder (Di- und Polysilicat) enthält. OH-Gruppen sind in diesen beiden Baueinheiten in solchen Anteilen gebunden, daß das Verhältnis von Poly-OH/Di-OH im Zusammensetzungsbereich von 1—1,5 CaO/SiO2 bei unterschiedlichen Bildungstemperaturen des C—S—H(Di, Poly) jeweils konstant ist, aber mit steigender Bildungstemperatur des C—S—H(Di, Poly) abnimmt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855280916
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation and constitution of the Crystalline Silicic Acid Trimethylsilyl Ester [(CH3)3Si]6Si6O15 (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 552 (1987), S. 236-240 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Herstellung und Konstitution des kristallinen Kieselsäuretrimethylsilylesters [(CH3)3Si]6O15Durch Trimethylsilylierung des Tetraethylammoniumsilicats wurde ein neuer kristalliner Kieselsäuretrimethylsilylester hergestellt. Konstitutionsuntersuchungen mit Hilfe der Gaschromatographie, Massenspektrometrie, 29Si NMR- und Röntgenanalyse zeigen, daß der Kieselsäuretrimethylsilylester aus käfigartigen Doppeldreiringen aufgebaut ist, die jeweils sechs nichtäquivalente SiO4 Tetraeder und Trimethylsilylgruppen enthalten.
    Notes: A new crystalline compound has been synthesized by trimethylsilylation of tetraethylammonium silicate which was identified by means of gas chromatography, mass spectrometry, 29Si NMR and X-ray analysis to be a eage-like double three-ring silicic acid trimethylsilyl ester containing six inequivalent SiO4 tetrahedra and trimethylsilyl groups.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875520927
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