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  • Confor-mational Analysis  (1)
  • Contralateral sensitization  (1)
  • Springer  (2)
  • 1
    ISSN: 0948-5023
    Keywords: High-Temperature MD Simulations ; Confor-mational Analysis ; Porphyrin-Quinone Systems ; Photosynthesis Models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Photoinduced electron transfer reactions play an important role in the primary step of the biological photosynthesis process. In an attempt to understand better the mechanism of the charge separation organic donor-acceptor molecules containing porphyrins and quinones were designed as photosynthesis models. In order to study the structure dependence of the photoinduced electron transfer twofold and fourfold bridged porphyrin-quinone systems with increasing donor-acceptor distance were synthesized (Figure 1) [1, 2, 3]. It was assumed that in these molecules the porphyrin and quinone should be linked in a rigid and well-defined orientation. To verify this assumption the conformational behavior of these systems was studied by high-temperature MD simulations in combination with conformational analysis of selected minimized structures [4, 5].
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 169 (1991), S. 323-330 
    ISSN: 1432-1351
    Keywords: Habituation ; Contralateral sensitization ; Leaky integrator ; Rotation detectors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Fruitflies (Drosophila melanogaster) may respond with landing reactions in tethered flight to unilateral progressive motion of single vertical dark stripes. The response frequency to repeated unilateral stimulation has a characteristic time course, a fast increase followed by a slower decrease. This behaviour is explained by the habituation of the input channels to a leaky integrator. The half-life of the integrated signal is in the range of 1 s. ‘Contralateral sensitization’ (CoS) describes the sensitization of the landing response to unilateral stimuli by preceding contralateral stimulation. It acts by increasing the initial reactivity, which habituates. The effects of CoS are thus still obvious after 1 min of repetitive stimulation. CoS can effectively be mediated by movement stimuli as well as by flickering light. We also show that binocular rotation rather than unilateral back to front motion inhibits the landing response (in the monocular part of the visual field). The biological significance of the described temporal characteristics of the landing response system and their possible neuronal basis are discussed.
    Type of Medium: Electronic Resource
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