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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 553 (1989), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 119 (1986), S. 135-139 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 98 (1987), S. 49-55 
    ISSN: 1437-1596
    Keywords: Tetrahydrofuran, in histologic materials ; Tetrahydrofuran, Nachweis in biologischem Material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Der Einsatz und die Kombination von GC, GC/MS und Headspace-Variante ermöglicht die Routine-Analyse von Tetrahydrofuran (THF) in biologischem Material. Probleme mit der Headspace-Methode, die auf die beträchtliche Wasser- und Lipidlöslichkeit dieser Substanz zurückgehen, konnten durch eine Aussalz-Technik gelöst werden. Bei Konzentrationen von über 5 μg pro Probe wurde die Identifizierung massenspektrometrisch durchgeführt. Im Rahmen quantitativer Bestimmungen kam bei der GC Tetrahydropyran (Pentamethylen-oxid) bzw. bei der GC/SIM octadeuteriertes THF (TDF) als innerer Standard zum Einsatz. THF konnte bis zu 1 μg pro Probe mittels GC und bis zu 0,1 μg pro Probe mittels GC/SIM nachgewiesen werden. Bei Labortieren wurden Maximalspiegel von THF im Blut ungefähr 1 h nach oraler Applikation beobachtet; die Halbwertszeit lag bei etwa 5 h. Das Verteilungsverhältnis zwischen Gewebe und Blut war etwa 1,5–2 bei Fettgewebe und Niere bzw. praktisch übereinstimmend bei Gehirn, Leber, Milz und Muskulatur.
    Notes: Summary Routine analysis of tetrahydrofuran (THF) in biologic materials has become feasible using GC and GC/MS and the headspace method. Problems of the headspace method and this substance which has a high water-and lipid-solubility were overcome by using the salting-out technique. Identification was made by mass spectral examination, in case of concentrations over 5 μg per sample. For quantitative determinations, tetrahydropyran (pentamethylene oxide) was used as an internal standard in GC, and a stable isotopic substance, octadeuterated THF (TDF) in GC/SIM. THF was detected in 1 μg per sample by GC, and 0.1 μg per sample by GC/SIM. THF blood levels in laboratory animals reached their highest values about 1 h after the oral administration, and the half-life was about 5 h. Ratios of tissue levels to blood were ca. 1.5–2 in the adipose tissue and kidney, and fairly equal in the brain, liver, spleen, and muscle.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 75 (1987), S. 26-29 
    ISSN: 1432-2242
    Keywords: Density gradient centrifugation ; Electric fusion ; Epidermis protoplasts ; Heterokaryocyte enrichment ; Mesophyll protoplasts ; Nicotiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mesophyll protoplasts from Nicotiana glauca were fused with epidermal protoplasts from N. langsdorffii by an electric pulse. After the fusion products were centrifuged on stepwise density gradient centrifugation using Percoll and sea water, somatic hybrids were observed at 70%–80% in the fraction recovered from the intermediate specific gravity fraction between epidermis and mesophyll protoplasts. From offsprings of these somatic hybrids, teratomatous plants were regenerated. Since the difference of specific gravity between mesophyll and epidermis protoplasts is inherent, this procedure can be essentially applied to obtain somatic hybrids between any combination of plants. The significance of this study is discussed in relation to obtaining somatic hybrids between plant materials without any appropriate genetic markers.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 146 (1988), S. 61-63 
    ISSN: 1615-6102
    Keywords: Actin filament ; Actin ring ; Rhodamine-phalloidin ; Fluorescence microscopy ; Tobacco ; Plastid division
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ring formed actin filaments were observed in tobacco BY-2 cells. The change of this structure during culture was followed by fluorescence microscopy.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular histology 19 (1987), S. 533-536 
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In order to demonstrate the localization of an anti-allergic agent, Tranilast, in the mast cells, light microscopic radioautography was performed. The mast cells collected from rat peritoneal cavity were incubated for 0 to 60 min in a medium containing3H-Tranilast. After the incubation, they were fixed, embedded and processed for light microscopic radioautography. The radioautographic silver grains were frequently localized around and over the cytoplasmic granules and their number increased according to the prolongation of incubation time. From the results obtained at present it was demonstrated that Tranilast was rapidly taken into the cytoplasm of mast cells. This phenomenon may suggest an important role of this agent in the inhibition of allergic reactions of mast cells.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 12 (1989), S. 291-292 
    ISSN: 1434-6079
    Keywords: 36.40 ; 34.50.H ; 34.80.D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Van der Waals clusters of various molecules were collisionally ionized by high-Rydberg rare gas atoms and slow electrons. Negative cluster ions thus produced were detected by mass spectroscopy. The ionization mechanism were investigated by measurements of the size- and the energy-dependences of the electron attachment cross sections.
    Type of Medium: Electronic Resource
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