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  • 1
    Digitale Medien
    Digitale Medien
    Photodissociation of 1,1,1-trifluorodichloroethane at 147 nm. Evidence for chlorine atom reactions (1980)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 84 (1980), S. 2146-2151 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100454a008
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  • 2
    Digitale Medien
    Digitale Medien
    Inhibition of the amino-acid co-transport carrier of Lemna gibba by incorporation ofp-fluorophenylalanine (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 55 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: In Lemna gibba L. a 2 h pretreatment with the amino-acid analogue p-fluorophenylalanine p-FPA inhibited subsequent uptake of L-alanine and reduced the transient depolarization of the plasmalemma caused by L-alanine. Uptake of 3–0-methylglucose was less affected. There was no effect of p-fluorophenylalanine on the resting potential or on the fusicoccin- or light-dependent hyperpolarization of the cells. Furthermore, fusicoccin-stimulation of uptake of L-alanine and 3–0-methylglucose was also unaffected. The results suggest that p-FPA pretreatment selectively acts on the H+-amino-acid co-transport carrier, that the H+-hexose co-transport carrier is much less affected, and that the proton pump appears to be unaffected by p-FPA.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb02293.x
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  • 3
    Digitale Medien
    Digitale Medien
    Uptake of neutral and acidic amino acids by Lemna gibba correlated with the H+-electrochemical gradient at the plasmalemma (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 55 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Uptake rates of L-alanine, L-serine and L-aspartate and trans-membrane electrical potentials (Δψ) were determined for a pH range in the external medium between 3.5 and 9.0. The proton electrochemical gradients (〈inlineGraphic alt="inline image" href="urn:x-wiley:00319317:PPL351:PPL_351_mu1" location="equation/PPL_351_mu1.gif" extraInfo="missing"/〉) were calculated from Δψ, pH of the medium, and an assumed cytoplasmic pH of 7.5. At external amino-acid concentrations of 0.1 mol m−3, where carrier-mediated uptake dominates total uptake, a linear correlation between uptake rates and 〈inlineGraphic alt="inline image" href="urn:x-wiley:00319317:PPL351:PPL_351_mu1" location="equation/PPL_351_mu1.gif" extraInfo="missing"/〉 is obtained, which extrapolates to zero uptake at zero 〈inlineGraphic alt="inline image" href="urn:x-wiley:00319317:PPL351:PPL_351_mu1" location="equation/PPL_351_mu1.gif" extraInfo="missing"/〉. This corroborates the contention that neutral and acidic amino acids are taken up by Lemna gibba L. by H+-cotransport.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb00304.x
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  • 4
    Digitale Medien
    Digitale Medien
    Amino acid uptake by Lemna gibba by a mechanism with affinity to neutral L-and D-amino acids (1980)
    Springer
    Planta 150 (1980), S. 230-235 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Amino acids ; Electric membrane potentials ; Lemna ; Membrane transport
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Earlier work suggested that amino acid uptake by Lemna gibba cells is a H+-cotransport mechanism driven by a proton-electrochemical gradient at the plasmalemma. The present investigations of the transient membrane depolarizations elicited by amino acids and tracer-uptake experiments show that all neutral α-L-amino acids, D-alanine and analogues, like β-alanine and p-fluorophenylalanine, are transported by the same system. It remains to be seen if there are separate mechanisms for the uptake of acidic and basic amino acids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00390831
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  • 5
    Digitale Medien
    Digitale Medien
    Triple differential cross section measurements for the electron impact ionization of helium: Comparison with a second Born approximation (1982)
    Springer
    The European physical journal 304 (1982), S. 119-124 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Triple differential cross sections for the ionization of helium by electrons of 500 eV impact energy have been measured in a coplanar, asymmetric geometry and for energies of the ejected electrons of 2.5, 5, 10 and 20 eV. A comparison is made between experimental data and a second Born treatment of Byron, Joachain and Piraux [1] for atomic hydrogen but for corresponding momenta of the incoming and the two outgoing electrons and for corresponding momentum transfer during the collision. The second Born describes quite well the shifts of the binary peak and the recoil peak to larger angles, the asymmetry of the recoil peak and the ratios of the intensities of binary to recoil peaks for different scattering parameters. — A quantitative estimate is made (for high impact energy) of the contributions to the total cross section of those ionizing collisions, in which the recoil peak intensity represents a considerable quantity. Probably most of these events can not be described by a single collision approximation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01414726
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  • 6
    Digitale Medien
    Digitale Medien
    Bestimmung von Seltenen Erden und anderen Spaltprodukten in frisch bestrahlten Kernbrennstoffen nach DC-Trennung und Anreicherung (1980)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 300 (1980), S. 15-17 
    Details
    ISSN: 1618-2650
    Schlagwort(e): Best. von Seltenen Erden ; Spaltprodukten in Kernbrennstoffen ; Chromatographie ; Dünnschicht
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Frisch bestrahlte Kernbrennstoffe werden in konz. Salpetersäure gelöst und mit dem Laufmittel Diethylether/Bis-(2-ethylhexyl)phosphat/ Salpetersäure (100∶3∶2) chromatographiert. Die Seltenen Erden werden nach der Trennung γ-spektroskopisch bestimmt. Bei zweidimensionaler DC-Trennung mit den Laufmitteln Di-iso-propylether/Tetrahydrofuran/Salpetersäure (100∶80∶4) im ersten und Diethylether/Bis-(2-ethylhexyl)phosphat/Salpetersäure (100∶4∶2) im zweiten Lauf wird eine quantitative Trennung der S.E. von allen anderen radioaktiven Spaltprodukten erreicht. Die Nachweisgrenzen wurden bestimmt und die absoluten Mengen der entstandenen S.E. berechnet. Die Trennung und Bestimmung dauert nach Lösen der Proben 60–70 min.
    Notizen: Summary Nuclear fuels of short decay times are dissolved in concentrated nitric acid and analysed by thin-layer chromatography in diethylether/bis-(2-ethylhexyl)phosphate/nitric acid (100∶3∶2). Rare earth elements (RE) are determined after separation by γ spectroscopy. By two-dimensional thin-layer separation in di-isopropylether/THF/nitric acid (100∶80∶4) and diethylether/bis-(2-ethylhexyl)phosphate (100∶4∶2) a quantitative separation of the RE from all other fission products is achieved. Detection limits are determined and the absolute amounts of RE are estimated. Separation and detection after dissolving of the samples require 60–70 min.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00498708
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