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  • biosynthesis of pheophytin a and chlorophyll a  (2)
  • emotional behavior  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Effect of mesencephalic stimulation on responses to nociceptive stimulation of the dental pulp (1976)
    Springer
    Bulletin of experimental biology and medicine 82 (1976), S. 1445-1448 
    Details
    ISSN: 1573-8221
    Keywords: pain ; mesencephalon ; analgesia ; emotional behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Chronic experiments on cats showed that stimulation of certain zones of the mesencephalon reduces or completely suppresses responses to pain caused by stimulation of the dental pulp. Depending on the parameters of brain stimulation the antinociceptive effect was manifested as differential changes in individual motor, autonomic, emotional, and behavioral components of the integral nociceptive response. After-analgesia was found and the dynamics of the return of the various manifestations of pain after cessation of brain stimulation was noted. The possible mechanisms of the antinociceptive effect are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00799772
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in the antinociceptive effect of mesencephalic stimulation produced by analgesics and tranquilizers (1978)
    Springer
    Bulletin of experimental biology and medicine 85 (1978), S. 42-46 
    Details
    ISSN: 1573-8221
    Keywords: pain ; analgesia ; mesencephalon ; emotional behavior ; analgesics ; tranquilizers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Chronic experiments on cats showed that analgesics, in subanalgesic doses, not only exhibit an antinociceptive effect when accompanied by subthreshold stimulation of the mesencephalon, but also potentiate the analgesic action of central stimulation. Tranquilizers only facilitate the development of an analgesic effect during subthreshold mesencephalic stimulation. The possible reasons for differences in the action of these substances are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00801452
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  • 3
    Electronic Resource
    Electronic Resource
    Light-regulated pigment interconversion in pheophytin/chlorophyll-containing complexes formed during plant leaves greening (1995)
    Springer
    Photosynthesis research 46 (1995), S. 445-453 
    Details
    ISSN: 1573-5079
    Keywords: biosynthesis of pheophytin a and chlorophyll a ; etiolated leaves ; pheophytin/chlorophyll interconversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Upon illumination of etiolated maize leaves the photoconversion of protochlorophyllide Pchlide 655/650 into chlorophyllide Chlide 684/676 was observed. It was shown that chlorophyllide Chlide 684/676 in the dark is transformed into pheophytin Pheo 679/675 and chlorophyll Chl 671/668 by means of two parallel reactions, occurring at room temperature: Chlide 684/676. The formed pheophytin Pheo 679/675 was unstable and in the dark was transformed into chlorophyll Chl 671/668 in a few seconds: Pheo 679/675 → Chl 671/668. The last reaction is reversed by the light: Chl/668 Pheo 679/675. Thus, on the whole in the greening etiolated leaves this process occurs according to the following scheme: The observed light-regulated interconversion of Mg-containing and Mg-free chlorophyll analogs is activated by ATP and inhibited by AMP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032299
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  • 4
    Electronic Resource
    Electronic Resource
    Photoinduced formation of pheophytin/chlorophyll-containing complexes during the greening of plant leaves (1994)
    Springer
    Photosynthesis research 42 (1994), S. 27-35 
    Details
    ISSN: 1573-5079
    Keywords: biosynthesis of pheophytin a and chlorophyll a ; etiolated leaves ; Photosystem II ; reaction centres
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Illumination of etiolated maize leaves with low-intensity light produces a chlorophyll/pheophytin-containing complex. The complex contains two native chlorophyll forms Chl 671/668 and Chl 675/668 as well as pheophytin Pheo 679/675 (with chlorophyll/pheophytin ratio of 2/1). The complex is formed in the course of two successive reactions: reaction of protochlorophyllide Pchlde 655/650 photoreduction resulted in chlorophyllide Chlde 684/676 formation, and the subsequent dark reaction of Chlde 684/676 involving Mg substitution by H2 in pigment chromophore and pigment esterification by phytol. Out data show that the reaction leading to chlorophyll/pheophytin-containing complex formation is not destructive. The reaction is in fact biosynthetic, and is competitive with the known reactions of biosynthesis of the bulk of chlorophyll molecules. The relationship between chlorophyll and pheophytin biosynthesis reactions is controlled by temperature, light intensity and exposure duration. The native complex containing pheophytin a and chlorophyll a is supposed to be a direct precursor of the PS II reaction centre in plant leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019055
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