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  • Best. von Kalium in Feldspat  (1)
  • Inorganic Chemistry  (1)
  • Rhizobium meliloti  (1)
  • R/V Vereshchagin
  • pollen analytical standard techniques
  • 1975-1979  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 121 (1979), S. 1-7 
    ISSN: 1432-072X
    Keywords: Rhizobium meliloti ; Symbiosis ; Influence of the RP4 plasmid on effectivity ; Cryptic plasmids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The occurrence of endogenous plasmid DNA in Rhizobium meliloti is reported. R. meliloti strains carrying RP 4 were used to work out a suitable plasmid isolation method. By sarcosyl lysis RP 4 plasmid DNA as well as cryptic plasmid DNA was isolated. Cryptic plasmid DNA possesses a buoyant density of 1.717 g cm-3 and shows a heterogeneity in contour length. Large plasmid molecules of 130 μm length were detected in the electron microscope. We also found that RP4 is able to restore the nitrogen fixation capacity of an ineffective R. meliloti strain.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 289 (1978), S. 41-43 
    ISSN: 1618-2650
    Keywords: Best. von Kalium in Feldspat ; Atomabsorption / Atomemission / Massenspektrometrie / Isotopenverdünnung ; Vergleich
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es werden vergleichende Bestimmungen des Kaliumgehaltes in Feldspäten mit den Methoden Flammen-Atomemissionsspektrometrie mit und ohne Leitelement, Flammen-Atomabsorptionsspektrometrie und massenspektrometrische Isotopenverdünnungsanalyse bei Probeneinwaagen von etwa 50 mg durchgeführt. Die massenspektrometrische Meßtechnik des Kaliums bei thermischer Oberflächenionisation wird beschrieben. Der Kaliumgehalt zweier Kalifeldspäte wird bei Anwendung der verschiedenen Verfahren mit relativen Standardabweichungen von 0,3–1,8% bestimmt.
    Notes: Summary The potassium content in feldspars is determined by the methods of flame atomic emission spectrometry with and without internal standard, flame atomic absorption spectrometry and mass spectrometric isotope dilution analysis with sample weights of about 50 mg. The mass spectrometric measurements of potassium by the thermal ionization technique is described. The potassium content of two potassium feldspars is determined by the different methods with relative standard deviations of 0.3–1.8%.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 453 (1979), S. 23-27 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chlorine Isotope Separation in a Heterogeneous Electrolyte System Dependence on the Concentration and the Counter Ion of a Fluoride SolutionIn a heterogeneous electrolyte system of a strongly basic anion exchanger and a concentrated fluoride solution the dependence of the chlorine isotope separation on the concentration and the counter ion of the fluoride solution is determined by chromatographic experiments. The results show the greatest separation effect of the chlorine isotopes so far achieved, using ion exchange reactions. 37Cl- is enriched in the solution phase, whereas 35Cl- is enriched in the ion exchanger. With increasing fluoride concentration the isotope separation effect decreases. The strong dependence of the isotope separation on the counter ion of the fluoride solution is shown using CsF and KF respectively.
    Notes: Im heterogenen Elektrolytsystem stark basischer Anionenaustauscher/konzentrierte Fluoridlösung wird die Abhängigkeit der Chlorisotopenseparation von Konzentration und Gegenion des Fremdelektrolyten in chromatographischen Versuchen bestimmt. Die Ergebnisse zeigen den bisher größten bekannten Elementartrenneffekt der Chlorisotope bei Ionenaustauschreaktionen, wobei sich das 37Cl- - gegenüber dem 35Cl--Ion in der Lösung des Systems anreichert. Mit steigender Fluoridkonzentration nimmt der Isotopentrenneffekt ab. Am Beispiel einer CsF - gegenüber einer KF - Lösung wird die starke Abhängigkeit der Isotopenseparation vom Gegenion des Fremdelektrolyten aufgezeigt.
    Additional Material: 2 Ill.
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