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  • 1980-1984  (2)
  • 1981  (2)
  • 1
    ISSN: 1432-0983
    Keywords: Chromoplasts ; DNA ; Inverted Repeats ; rRNA genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Circular plastid DNA molecules, isolated from flower chromoplasts of the daffodil (a monocotyledon), and the nasturtium (a dicotyledon), have been shown by electron microscopy to contain inverted repeat sequences of 28.5 ± 0.7 kbp and 27.1 ± 1.0 kbp, respectively. The regions separating the repeats have lengths of 16.6 ± 0.8 kb for the shorter region, and 87.8 ± 4.8 kb for the longer in the daffodil, and 18.5 ± 0.5 kb and 82.3 ± 3.1 kb for the corresponding regions in the nasturtium. Further, in both cases, the 23S and 16S ribosomal RNA genes have been located by hybridisation (R-Loop technique) within this inverted repeat. Although the distance between the 16S and 23S genes is comparable, the position of the rRNA gene blocks within the repeats is different in these two chromoplast DNAs, with a shift of 1,500 bp.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 307 (1981), S. 362-364 
    ISSN: 1618-2650
    Keywords: Best. von Silber in Gold ; Spektralanalyse ; nichttherm. Anregung im Graphitofen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die nichtthermische Anregung im Graphitrohrofen (FANES) ist eine neue Methode der Emissions-Spektralanalyse kleiner Probenmengen mit ausgezeichneter Empfindlichkeit [1]. In dieser Arbeit wird ein praktisches Analysenproblem — die Bestimmung von Silber in Golddraht mit einem Durchmesser von 50μm — als einfaches Anwendungsbeispiel für eine mit der FANES durchgeführte Mehrelementanalyse beschrieben. — Der Golddraht wurde in einer Mischung von HNO3 und HC1 gelöst. Danach wurde die Probe in den Ofen dosiert, getrocknet, verdampft und angeregt. Die Signale der Wellenlängen Ag 328 nm und Au 312,2nm wurden simultan mit einem Zweikanalspektrometer registriert.
    Notes: Summary The non-thermal excitation in the graphite furnace (FANES) is a new method of emission spectral analysis of small sample amounts with excellent sensitivity. A practical analysis problem — the determination of silver in gold wire with a diameter of 50 μm — is described as a simple example for a simultaneous multielement analysis made by FANES. — The gold wire was dissolved in aqua regia. The sample was then injected into the furnace, dried, atomized and excited. The signals of wave-length Ag 328 nm and Au 312,2 nm were simultaneously registered by a two-channel spectrometer.
    Type of Medium: Electronic Resource
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