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  • 1
    Electronic Resource
    Electronic Resource
    Determination of oxygen-to-uranium ratios in hypo- and hyperstoichiometric uranium dioxide and tungsten-uranium dioxide (1969)
    s.l. : American Chemical Society
    Analytical chemistry 41 (1969), S. 254-259 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60271a013
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of Uranium and Thorium Metals in Fuel Element Core Materials by Selective Decomposition of Their Hydrides. (1966)
    s.l. : American Chemical Society
    Analytical chemistry 38 (1966), S. 1687-1691 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60244a015
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  • 3
    Electronic Resource
    Electronic Resource
    A new approach to explain the “high irradiance responses” of photomorphogenesis on the basis of phytochrome (1975)
    Springer
    Journal of mathematical biology 2 (1975), S. 41-56 
    Details
    ISSN: 1432-1416
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Summary A new approach to explain the “high irradiance responses” of photomorphogenesis on the basis of phytochrome is described. Irradiance and wave-length dependency of different phytochrome reaction models are analyzed. 1) An open phytochrome model which is based on spectophotometric data (Schäfer, 1972; Schäfer et al., 1972; Schäfer and Mohr, 1974) and describes only the induction phenomena is presented; 2) A closed phytochrome-receptor model which is based on the analysis of phytochrome-receptor interactions (Quail et al., 1973a. Quail and Schäfer, 1974) describes the principal behavior of high irradiance responses, namely, optimum quantum responsivity in the far-red and blue part of the visible spectrum and the irradiance dependency. This model cannot account for the induction phenomena; 3) An open phytochrome-receptor model which describes both the properties of the induction responses, as well as those of the high irradiance responses, is tested for its physiological relevance by comparing the predictions based on this model with the measured data for phytochrome controlled anthocyanin synthesis (Wagner and Mohr, 1966) and suppression of lipoxygenase synthesis in the mustard seedling (Oelze and Mohr, 1973).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276015
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  • 4
    Electronic Resource
    Electronic Resource
    Phytochrome behaves as a dimer in vivo (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 10 (1987), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract It is well established that phytochrome exists as a dimer in vitro. A comparison of the relative photoequilibrium concentrations of PrPr, PrPfr and PfrPfr, with the relative sizes of the Pfr-pools which undergo dark reversion in the intact plant, leads to the hypothesis that phytochrome also exists as a dimer in vivo, This hypothesis is in accordance with kinetic properties of the phytochrome system under continuous irradiation. Additional support for this view is provided by the observation that Pfr-destruction after a red light flash, which should favour the formation of PrPfr dimers, is paralleled by a decay of Pr, even if the presence of Pr cycled through Pfr can be excluded. Preliminary observations could indicate an interaction of the subunits of a phytochrome dimer during the process of phototransformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11602037
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  • 5
    Electronic Resource
    Electronic Resource
    Correlation between far-red absorbing phytochrome and response in phytochrome-mediated anthocyanin synthesis (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 2 (1979), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Mustard seedlings were light treated at 24 h after sowing (25°C) to induce phytochrome-mediated anthocyanin synthesis in cotyledons and hypocotylar hook. All light treatments were performed within the range of the reciprocity law. The in situ photoconversion kinetics of phytochrome (Pr→ Pfr) were measured under the same light treatment. It was found that between 0.4 and 1.0 relative Pfr level the amount of anthocyanin extracted from the organs at 52 h after sowing was linearily correlated with the amount of Pfr produced at 24 h in cotyledons and hypocotylar hook. It is concluded that an explanation of the fluence response function for red light mediated anthocyanin synthesis in the mustard seedling does not require the concept of active vs. bulk phytochrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1979.tb00788.x
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  • 6
    Electronic Resource
    Electronic Resource
    Signal transduction in the photocontrol of chalcone synthase gene expression (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 20 (1997), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The photocontrol of chalcone synthase gene expression was studied by means of promoter analyses, in vitro systems, photoreceptor mutants and microinjections, and pharmacological approaches. A 52 bp element of the promoter is necessary and sufficient to transfer light regulation. Chalcone synthase expression is primarily under the control of phyA and blue/UV photo receptors; the latter are functional even in the absence of phyA and phyB. Phytochromes seem to be soluble proteins and, within seconds of irradiation, light-dependent phosphorrylations were observed in membrane-depleted cytosol preparations, indicating very early processes of signal transduction. Microinjection and pharmacological experiments reveal that, in the phyA pathway, heterotrimeric G-proteins, cGMP and a genistein-sensitive protein kinase are involved, whereas the UV pathway includes several trimeric G-proteins and Ca/calmodulin-dependent steps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.1997.d01-98.x
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  • 7
    Electronic Resource
    Electronic Resource
    Photoperiodism and rhythmic response to light (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Seedlings of Pharhitis nil show a circadian rhythm in the capacity to flower in response to the timing of a second red light pulse given at various times after a first saturating exposure to red when this is given together with a benzyladeninc spray. There are also changes in the photon irradiance required for half maximum response to the second red pulse.The photochemical properties of phytochrome in the photoperiodically sensitive cotyledons were also shown to change rhythmically. Oscillations in both pr→ Pfr and Pfr→ Pr photoconversion characteristics persisted over at least two circadian cycles with a periodicity of about 12 h. There were, however, no significant oscillations in either Pfr peak absorbance or in Δ(ΔA). The changes in sensitivity for the photoconversion of Pr→ Pfr did not parallel the much larger changes in sensitivity of the flowering response to red light. The amplitude of the Pr→ Pfr rhythm was at least as great as that for Pr→ Pfr, but the flowering response to far-red light was not rhythmic, nor was there any large change in sensitivity. The changes in photoconversion properties may reflect a basic biochemical oscillation which affects both photoreceptor properties and sensitivity to photoreceptor input.There was also a marked rhythm in the Pfr/P ratio that would be established by a saturating pulse of red light and this too may have affected the flowering response to such a pulse.Far-red light inhibited flowering when given at any time during the inductive night. After 14 h in darkness, Pfr could still be measured in the cotyledons and it was concluded that far-red light inhibited flowering by removing Pfr As red light also inhibited flowering at this time, there may be two pools of phytochrome with different kinetic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1982.tb00939.x
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  • 8
    Electronic Resource
    Electronic Resource
    Variation in dynamics of phytochrome A in Arabidopsis ecotypes and mutants (2000)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 23 (2000), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Phytochromes are photoreceptors in plants which can exist in two different conformations: the red light-absorbing form (Pr) and the far-red light-absorbing form (Pfr), depending on the light quality. The Pfr form is the physiologically active conformation. To attenuate the Pfr signal for phytochrome A (phyA), at least two different mechanisms exist: destruction of the molecule and dark reversion. Destruction is an active process leading to the degradation of Pfr. Dark reversion is the light-independent conversion of physiologically active Pfr into inactive Pr. Here, we show that dark reversion is not only an intrinsic property of the phytochrome molecule but is modulated by cellular components. Furthermore, we demonstrate that dark reversion of phyA may be observed in Arabidopsis ecotype RLD but not in other Arabidopsis ecotypes. For the first time, we have identified mutants with altered dark reversion and destruction in a set of previously isolated loss of function PHYA alleles (Xu et al. Plant Cell 1995, 7, 1433–1443). Therefore, the dynamics of the phytochrome molecule itself need to be considered during the characterization of signal transduction mutants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2000.00550.x
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  • 9
    Electronic Resource
    Electronic Resource
    Hypocotyl growth in Sinapis alba L: the roles of light quality and quantity (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 5 (1982), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. A comparison is made of the relative effectiveness of light quality and light quantity on the elongation growth of Sinapis alba hypocotyls. The results show that hypocotyl extension rate in plants which have not previously been exposed to light is controlled primarily by the prevailing photon fluence rate when the phytochrome photostationary state lies between ∼0.033 and ∼0.81. Below ∼0.033, changes in photostationary state also have a marked effect on extension rate. Elongation growth in light-adapted plants is controlled by both photon fluence rate and the spectral quality of the incident radiation at all photoequilibria. Photosynthesis can modify these responses but is not essential as a prior condition for a green plant to respond to changes in light quality and quantity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11587590
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  • 10
    Electronic Resource
    Electronic Resource
    Cell Kinetic Studies of the Effect of Cytotoxic Drugs on Survival and Proliferation of Ascites and Solid Tumor Cells of the Mouse (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 459 (1985), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1985.tb20837.x
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