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  • Electron microscopy  (1)
  • Extraktion  (1)
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  • 1
    ISSN: 1432-2242
    Keywords: Mitochondrial DNA of plants ; Electron microscopy ; Suspension culture ; Vicia faba
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A comparative analysis of the Vicia faba mitochondrial genome in whole plants and in longterm suspension culture has been conducted. Restriction fragment patterns of the mtDNA isolated from these two sources were notably different. Electronmicroscopic analysis also revealed significant differences. Large circular mtDNA patterns shifted from a 37–80 kb subpopulation, which was predominant in whole plants, to 18–34 kb subpopulations although in both classes notable quantities of circular molecules of 80 to 120 kb and more were also found. Both in whole plant and suspension culture cells very large circular DNAs were observed. Some of them had lengths nearly 290 kb and could be considered as evidence of the existence of master chromosomes. The minicircular DNA population was also altered. In the suspension culture we observed a notable increase of percentage of minicircles with sizes near 1 kb. Simultaneously, the percentage of minicircles with sizes near 3.5–10 kb significantly increased in suspension culture cells. In addition, a new peak (10–12 kb) of minicircles appeared. Copy number alterations for some sequences homologous to CCC1A, CCC1B and CCC2 (Negruk et al. 1982, 1985) were shown. Southern hybridization revealed the existence of a family of minicircles having sizes 1.4–2 kb with predominance of CCC1A, CCC1B and CCC2. The copy numbers of CCC1B and some minor minicircles was changed in the suspension culture when compared with the whole plants.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 306 (1981), S. 125-128 
    ISSN: 1618-2650
    Keywords: Best. von Antimon mit Triphenyltetrazoliumchlorid ; Spektralphotometrie ; Extraktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The optimum conditions for the antimony(V) extraction in strong hydrochloride acid medium as a ternary ion-associated complex with triphenyltetrazolium chloride have been investigated. The extraction constant has been determined with dichlorethene and chloroform (1∶1) (K ex =3.06×104). A working procedure for the determination of antimony has been developed. Interferences are only caused by iron(III), gold(III), thallium(III) and gallium. The application of the method is demonstrated by the analysis of metallic lead, which has also been carried out with two other methods (AAS and spectrophotometry with crystal violet). The new method is superior in reliability and accuracy. The relative standard deviation of the mean is ± 7.4%.
    Notes: Zusammenfassung Die optimalen Bedingungen für die Extraktion von Antimon aus stark salzsaurer Lösung als Ionenanlagerungskomplex mit Triphenyltetrazoliumchlorid wurden bestimmt. Die Extraktionskonstante bei Extraktion mit einer Dichlorethan-Chloroform-Mischung (1∶1) beträgt (K ex =3,06·104). Für die Antimonbestimmung wurde eine entsprechende Methode ausgearbeitet. Nur Fe(II), Au(III), Tl(III) und Ga(III) stören. Die Anwendung der Methode wurde an Hand der Analyse von metallischem Blei demonstriert, die zusätzlich auch nach zwei anderen Methoden (AAS und Spektralphotometrie mit Kristallviolett) durchgeführt wurde. Die neue Methode ist in bezug auf Zuverlässigkeit und Genauigkeit überlegen. Die relative Standardabweichung des Mittelwertes beträgt ± 7,4%.
    Type of Medium: Electronic Resource
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