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  • 1
    ISSN: 1432-0983
    Keywords: Cyanophora paradoxa ; Ferredoxin-NADP+-oxidoreductase ; Protein-import ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cyanophora paradoxa is an important model organism for the study of the transition from endocytobiontic cyanobacteria to factual eukaryotic cell organelles. The cyanelles of these organisms possess cyanobacterial, as well as plastidic, characteristics. Although the transfer of cyanellar proteins from cytosolic into cyanellar space has been shown, the process of translocation of a known protein across the peptidoglycan layer and the envelope membranes has not been characterized. In this study we demonstrate that a specific and obligate cyanelle protein —Ferredoxin-NADP+-oxidoreductase (FNR) — is coded on the nuclear genome, synthesized on 80S ribosomes and transported from the eukaryotic cell compartment into the cyanelles of Cyanophora paradoxa, an original intracellular host-guest relation. These results indicate a gene transfer from guest to host genome and support the view that, in spite of their cyanobacterial origin, cyanelles have been evolved to cell organelles comparable to plastids.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Psychotherapeut 45 (2000), S. 170-175 
    ISSN: 0935-6185
    Keywords: Schlüsselwörter Luhmann ; Systemtheorie ; Autopoiese ; Psychotherapie ; Key words Luhmann ; Systems theory ; Autopoiesis ; Psychotherapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology , Medicine
    Description / Table of Contents: Summary In 1984 the German sociologist Niklas Luhmann presented in his work „Soziale Systeme” (English translation: Niklas Luhmann: Social systems. Stanford Univ. Press) a theory, which can be used to describe social, psychic and biological systems as well. On one hand he emphasizes the closed and selfreferring nature of the three system levels: communication (social systems), consciousness (psychic systems) and life (biological systems), on the other hand he provides a model, how these three system levels are in spite of their complete functional separation closely related and linked together. Within this theory psychotherapy can be seen as a social system created by both the patient and the therapist in order to open a space of resonance to the patients development. This point of view allows a new understanding of what happens within a therapeutic process and what can (or cannot) be known and determined about it.
    Notes: Zusammenfassung Niklas Luhmann stellte 1984 mit seinem Werk „Soziale Systeme” ein Theoriegebäude vor, das zur Beschreibung sozialer, psychischer und biologischer Systeme geeignet ist. Er betont dabei einerseits die selbstreferentielle Geschlossenheit der drei Systemebenen Kommunikation (Soziales), Bewusstsein (Psyche) und Leben (Biologie, Physiologie), anderseits liefert er ein Modell, wie diese Systemebenen trotz völliger funktioneller Trennung miteinander verknüpft sind und einander gegenseitig bedingen. Im Rahmen dieser Theorie kann Psychotherapie als soziales System aufgefasst werden, das von Patient und Therapeut erzeugt wird und den Resonanzraum für eine psychische Veränderung oder Entwicklung zur Verfügung stellt. Diese Betrachtungsweise ermöglicht einen neuen Blick auf das, was in einer Psychotherapie geschieht und was darüber prinzipiell (nicht) gewusst und verstanden werden kann.
    Type of Medium: Electronic Resource
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