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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Protoplasma 153 (1990), S. 178-185 
    ISSN: 1615-6102
    Schlagwort(e): Cryptophyceae ; Dinoflagellate ; Dinophyceae ; Endosymbiosis ; Gymnodinium ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The freshwater dinoflagellateGymnodinium acidotum is known to harbor a cryptomonad endosymbiont whose chloroplasts give the organism its blue-green coloration. Every cell examined from a wild population possessed chloroplasts, mitochondria, and other organelles which are of endosymbiotic origin. Transmission electron microscopy and fluorescence microscopy revealed that only 33% of these cells possessed the nucleus of the endosymbiont. The lack of a cryptomonad nucleus in some cells did not appear to affect the cells' ability to photosynthesize or move in response to varying levels of illumination. This represents the first report of a host/endosymbiont relationship in which a significant number of individuals from a given population lack a major endosymbiont organelle.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1615-6102
    Schlagwort(e): Amphidinium ; Dinoflagellates ; Cytoskeleton ; Gymnodinium ; Immunofluorescence ; Microtubules
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The sub-thecal microtubular cytoskeleton of the dinoflagellatesAmphidinium rhynchocephalum, Gymnodinium sanguineum, andGymnodinium. sp has been investigated by indirect immunofluorescence microscopy. In these cells, the majority of cytoskeletal microtubules lie in the anterior-posterior plane. These longitudinal microtubules clearly originate from one of two radially arranged microtubular bands that correspond in location with the anterior and posterior edge of the cingolar depression. Despite the morphological variability of these gymnodinioid dinoflagellates, our data indicate that the microtubular cytoskeleton perfectly reflects the spatial patterning of the epicone and hypocone in each cell.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1615-6102
    Schlagwort(e): Bodonid ; Crithidia ; Cytoskeleton ; Cytostome ; Diplonema ; Euglena ; Feeding apparatus ; Flagellar apparatus ; Microtubular root ; Mitosis ; Pellicle ; Rhynchomonas ; Trypanoplasma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The euglenoids and kinetoplastids form a diverse assemblage of organisms which show no obvious phylogenetic relationship with other flagellates. An ultrastructural examination and comparison of the flagellar apparatus, the feeding apparatus, and mitotic nucleus indicate a number of shared morphological features which support a common ancestry for the two groups. Of particular interest is the euglenoid,Petalomonas cantuscygni, which shares many of the ultrastructural features common to both groups. Based on the data presented, we hypothesize that a euglenoid with features similar to those now present inP. cantuscygni was ancestral to both the euglenoid and kinetoplastid lines.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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