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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biosystems 12 (1980), S. 85-104 
    ISSN: 0303-2647
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0309-1651
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0014-5793
    Keywords: Eyespot ; Green algae ; Photoreceptive organelle ; Phototaxis ; Retinal
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 111 (1982), S. 221-233 
    ISSN: 1615-6102
    Keywords: Calcium ; Flagellar scales ; Green algae ; Scale topography ; Tetraselmis cordiformis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The structure and topography of flagellar scales (underlayer scales, rodshaped scales, hair-scales) in the green flagellateTetraselmis cordiformis has been studied in detail and the effect of divalent cations and fixation conditions on scale structure and topography was followed quantitatively. Hair-scales occur in two rows on opposite sides of a flagellum and are linked to the flagellar membrane and to two axonemal doublets by B-tubule-flagellar membrane connectives. Underlayer scales form about 24 longitudinal rows along the flagellum and occur in two distinctive shapes (pentagonal and square). The square shaped underlayer scales are related in position to the attachment sites of the hair-scales. Rod-shaped scales occur in about 20 longitudinal rows along the flagellum and are characteristically positioned as “double scales”. Calcium in the culture medium is necessary to retain rod-shaped scales on the flagellum, absence of calcium or chelation with EGTA or pyrophosphate leads to disappearance of rod-shaped scales from the flagellum. Other divalent cations can only partially substitute for calcium. It is suggested that calcium provides the linkage between underlayer scales and rod-shaped scales inTetraselmis. Flagellar scales inTetraselmis apparently fall into two categories: a) hair-scales (not affected by fixation or absence of divalent cations, firmly bound to axonemal microtubules via the flagellar membrane), b) underlayer scales and rod-shaped scales (affected by fixation and absence of divalent cations, kept on the flagellum mainly by electrostatic forces). The function of flagellar scales inTetraselmis is discussed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 117 (1983), S. 154-157 
    ISSN: 1615-6102
    Keywords: Paraflagellar body membrane ; Freeze-fracture ; Euglena ; Phototaxis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The membrane overlying the paraflagellar body (PFB) ofEuglena gracilis is structurally specialized when studied with the freeze-fracture technique. This membrane area is characterized by exclusion of larger-sized (10–14nm) intramembrane particles and appears relatively smooth. In a limited region this membrane is closely appressed to the plasmalemma of the reservoir adjacent to the eyespot globules. The membrane specializations in the PFB-membrane ofEuglena are discussed in relation to photoreception and sensory transduction during phototaxis.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 133 (1986), S. 39-49 
    ISSN: 1615-6102
    Keywords: Cytostome ; Euglena ; Flagellar apparatus ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A short cylindrical pocket arises as an infolding from the ventral surface of the reservoir near the canal in several species ofEuglena (E. mutabilis, E. gracilis strain T,E. spec.). The structure is linked to a band of microtubules which is shown to be identical to the ventral flagellar root of the euglenoid flagellar root system. An absolute configuration analysis of the flagellar root system inE. mutabilis and a comparison with the flagellar apparatus of colourlessEuglenophyceae and the bodonids (Kinetoplastida) reveals structural and positional homology between the reservoir pocket ofEuglena and the cytostome of these organisms and strongly supports the phylogenetic derivation of theEuglenophyceae from theKinetoplastida and the evolution of greenEuglenophyceae from phagotrophic colourless taxa. The functional significance of the cryptic cytostome ofEuglena is discussed in relation to the occurrence of intracellular endosymbiotic bacteria.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1615-6102
    Keywords: Immunocytochemistry ; Centrin ; Ca2-modulated contractile protein ; Flagellar apparatus ; Green algae ; Fibrous flagellar roots
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The two main types of fibrous flagellar roots present in the flagellar apparatus of green algae (system I and system II fibers) are immunologically distinct as indicated by the localization of a Ca2+-modulated contractile protein (centrin) exclusively in one type (system II fibers) but not in the other type (system I fibers). A polyclonal antibody generated against the major protein of the striated flagellar roots (system II fibers) of the quadriflagellate green algaTetraselmis striata was used to localize centrin by immunofluorescence and pre- and postembedding immunogold electron microscopy in the flagellar apparatus ofSpermatozopsis similis, S. exsultans, Chlamydomonas reinhardtii, Dunaliella bioculata, Polytomella parva and gametes ofMonostroma grevillei andEnteromorpha sp. Whereas the antibody recognizes centrin in connecting fibers and system II fibers, no labeling occurs in system I fibers in all taxa investigated. This study presents the first evidence that system I fibers lack centrin and indicates that the two main types of fibrous flagellar roots in green algae are biochemically distinct.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1615-6102
    Keywords: Cyanophora paradoxa ; Glaucocystophyceae ; Flagellar developmental cycle ; Light microscopy ; Basal body numbering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Flagellar development during cell division was studied inCyanophora paradoxa using agarose-embedded cells, Nomarski optics and electronic flash photography. The cells bear two heterodynamic and differently oriented (anterior and posterior) flagella. Prior to cell division, cells produce two new anterior flagella while the parental anterior flagellum transforms into a posterior flagellum. The parental posterior flagellum remains a posterior flagellum throughout this and subsequent cell divisions. The development of a single flagellum thus extends through at least two cell cycles and flagellar heterogeneity is achieved by semiconservative distribution of the flagella during cell division. Based on these principles a universal numbering system for basal bodies and flagella of eukaryotic cells is proposed.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1615-6102
    Keywords: Pedinomonas tuberculata ; Monomastix spec ; Pseudopedinella elastica ; Flagellar developmental cycle ; Light microscopy ; Uniflagellated algae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Flagellar development during cell division was studied by light microscopy in three taxa of uniflagellated algae,Pedinomonas tuberculata (Chlorophyta),Monomastix spec. (Chlorophyta), andPseudopedinella elastica (Chromophyta). As shown by electron microscopy during interphaseM. spec, andP. elastica contain a mature, non-functional second basal body, andP. tuberculata contains an immature (i.e., shorter) non-functional second basal body. Two different types of flagellar development were observed in the three taxa: inP. tuberculata the parental flagellum is transferred to one of the progeny cells, whereas the other progeny cell receives a newly formed flagellum that grows from the second non-functional basal body. InM. spec. andP. elastica the parental flagellum is either completely retracted (P. elastica) or partially retracted and autotomized (M. spec); each dividing cell develops two new flagella (from two newly formed basal bodies) which are distributed to the two progeny cells. The uniflagellated condition in algae can thus be attained by two completely different mechanisms: a non-functional second basal body is either the younger (no. 2; inP. tuberculata and otherChlorophyta) or the older (no. 1; inP. elastica and presumably otherChromophyta) of the two basal bodies.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 164 (1991), S. iii 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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