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  • 1
    Electronic Resource
    Electronic Resource
    Effect of diacetyl piquerol on H+-ATPase activity of microsomes fromIpomoea purpurea (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 2253-2261 
    Details
    ISSN: 1573-1561
    Keywords: Piquerol ; Piqueria trinervia ; modes of action ; allelopathy ; allelochemicals ; microsomes ; Ipomoea purpurea ; plasmalemma ; tonoplast ; germination ; H+-ATPase ; proton pumps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The effect of an allelopathic compound, diacetyl-piquerol on the H+ -ATPase activity of the microsomal fraction from the radicles of a common weedIpomoea purpurea was studied. The diacetyl-piquerol inhibited the germination and radicle growth fromI. purpurea; the radicle growth was increasingly inhibited (10% to 100%) as piquerol concentrations were raised (10 μM to 1000 μM). The H+-ATPase activity was inhibited (48%) by 500 μM diacetyl-piquerol, and this inhibition was higher in plasma membrane ATPase (67.2%) than in tonoplast membrane ATPase (31.4%). Additional studies of the precise physiological mechanisms of interference caused by allelopathic compounds are needed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026935
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photodegradation of Luminescence in SiO2 : Rh B Gels Exposed to YAG : Nd Laser Pulses (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 657-661 
    Details
    ISSN: 1573-4846
    Keywords: luminescence ; photostability ; photobleaching ; Rhodamine B ; silica gels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silicate gels doped with organic dyes have been proposed as solid-state tunable lasers. Photobleaching of the dye under laser excitation is an important phenomenon in this application. The optical absorption and luminescence of SiO2 silica gels doped with Rhodamine B exposed to the second harmonic pulses of a YAG : Nd laser have been studied. In addition to the characteristic exponential decay with the number of pulses, overlapping oscillations in the intensity were observed. This behavior is explained in terms of a long lived metastable electronic excited state of the dye molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008624201781
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    Paper (German National Licenses)
    Fulltext
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