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  • 1
    Electronic Resource
    Electronic Resource
    Periplast structure of the cryptomonad flagellateHemiselmis brunnescens (1986)
    Springer
    Protoplasma 131 (1986), S. 11-22 
    Details
    ISSN: 1615-6102
    Keywords: Cell surface ; Cryptophyceae ; Freeze fracture/etch ; Periplast ; Scales ; Self-assembly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The periplast ofHemiselmis brunnescens Butcher is a complex cell covering comprised of the plasma membrane (PM) sandwiched between a surface periplast component (SPC) and an inner periplast component (IPC). The SPC is revealed by deep-etching, and consists of hexagonal plates composed of tripartite subunits that appear to self-assemble into a crystalline layer with a hexagonal symmetry. Small scales (termed fibrillar scales) accumulate on the crystalline plates during cell growth, eventually forming a “carpet” that itself may appear crystalline when fully formed. Heptagonal “rosette scales” are occasionally observed on the surface as well. The position of the crystalline plates is precisely mirrored by both the E and P fracture faces of the PM. The plate proper is underlain by membrane with a high concentration of intramembrane particles (IMPs) while the bands of membrane underlying the plate borders lack IMPs. Access of subunits and fibrillar scales to the cell surface following initial plate formation appears to be at the plate boundaries. This study suggests that cryptomonad flagellates may provide model systems for studying the self-assembly of cell surface components, and for relating membrane structure to function, as evidence suggests a major role for the PM in mediating periplast assembly and development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281683
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transformation and development of the flagellar apparatus ofCryptomonas ovata (Cryptophyceae) during cell division (1992)
    Springer
    Protoplasma 170 (1992), S. 53-67 
    Details
    ISSN: 1615-6102
    Keywords: Basal bodies ; Cell symmetry ; Cryptomonas ; Cryptophyceae ; Flagellar apparatus ; Flagellar transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary InCryptomonas ovata, long, dorsal flagella are produced which transform during the following cell division into short, ventral flagella. At division there is a reorientation in cell polarity, and the parental basal apparatus, which comprises the basal bodies and associated roots, is distributed to the daughter cells via a complex sequence of events. Flagellar apparatus development includes the transformation of a four-stranded microtubular root into a mature root of different structure and function. Each newly formed basal body nucleates new microtubular roots, but receives a striated fibrous root from a parental basal body. The striated roots are originally produced on the transforming basal body and are “transferred” to the new basal bodies at each successive division. The development of the asymmetric flagellar apparatus throughout the cell cycle is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384457
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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