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Membrane specializations in the form of regular membrane-to membrane attachment sites in Paramecium : a correlated freeze-etching and ultrathin-sectioning analysis

Membrane specializations in the form of regular membrane-to membrane attachment sites in Paramecium : a correlated freeze-etching and ultrathin-sectioning analysis

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PLATTNER, Helmut, F. MILLER, Luis BACHMANN, 1973. Membrane specializations in the form of regular membrane-to membrane attachment sites in Paramecium : a correlated freeze-etching and ultrathin-sectioning analysis. In: Journal of Cell Science. 13, pp. 687-719

@article{Plattner1973Membr-7860, title={Membrane specializations in the form of regular membrane-to membrane attachment sites in Paramecium : a correlated freeze-etching and ultrathin-sectioning analysis}, year={1973}, volume={13}, journal={Journal of Cell Science}, pages={687--719}, author={Plattner, Helmut and Miller, F. and Bachmann, Luis} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/7860"> <dc:rights>deposit-license</dc:rights> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:38:05Z</dc:date> <dcterms:rights rdf:resource="https://creativecommons.org/licenses/by-nc-nd/2.0/legalcode"/> <dc:contributor>Miller, F.</dc:contributor> <dc:creator>Plattner, Helmut</dc:creator> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/7860"/> <dcterms:title>Membrane specializations in the form of regular membrane-to membrane attachment sites in Paramecium : a correlated freeze-etching and ultrathin-sectioning analysis</dcterms:title> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:38:05Z</dcterms:available> <dc:creator>Miller, F.</dc:creator> <dc:contributor>Plattner, Helmut</dc:contributor> <dcterms:bibliographicCitation>First publ. in: Journal of Cell Science 13 (1973), pp. 687-719</dcterms:bibliographicCitation> <dc:creator>Bachmann, Luis</dc:creator> <dcterms:abstract xml:lang="eng">The outer membrane complex of Paramecium was investigated by ultrathin-sectioning techniques and by freeze-etching of unfixed cells without cryoprotectants. Granules were found in the freeze-etched cortical membrane complex in a highly ordered arrangement; morphometric analyses and partial disruption of this membrane complex showed that some of these granular membrane specializations (which we call types a, b, e, f, g) represent membrane-to-membrane attachment sites. Type a: granules arranged in rings (single or double), 300 nm in diameter, connect plasmalemma and alveolar membranes around trichocysts. Type b: within these a-type rings, a concentric zone (180 nm diameter) of granules connects plasma membrane and trichocyst membrane. Type c: the trichocyst membrane further contains a central ring or patch, 80 nm in diameter, of rather large granules where it is in contact with the crystalline trichocyst matrix. Type d: ciliary necklaces are formed by groups of triple rows of 3-6, most frequently 5 granules, with 21-nm periodicity. Rows of granules also connect the alveolar membranes to the apical portion of the trichocyst membrane (type e) and the alveolar membrane to the plasmalemma around cilia (type f). Type g: the inner alveolar membrane displays an intense granularity and contains double rows of granules along alveolar septa at attachment sites between 2 alveolar membranes. Upon experimental discharge of the majority of trichocysts only the innermost concentric circles of membrane-bound granules of this region (b- and c-type) disappeared from the plasmalemma, while the outermost a-type rings of granules persisted for a longer time. Among other possible functions, these regular membrane-to-membrane attachments are likely to maintain the specific cellular shape.</dcterms:abstract> <dc:format>application/pdf</dc:format> <dc:language>eng</dc:language> <dc:contributor>Bachmann, Luis</dc:contributor> <dcterms:issued>1973</dcterms:issued> </rdf:Description> </rdf:RDF>

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