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  • 1
    Electronic Resource
    Electronic Resource
    Fine structure of the female genital apparatus of Philodina (Rotifera, Bdelloidea) (1982)
    Springer
    Zoomorphology 100 (1982), S. 89-105 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The organization of the female genital apparatus of the bdelloid rotifer Philodina roseola was analyzed by light and electron microscopy. It differs from that of the monogononts in several respects: the gonad is paired; in each gonad, the follicular layer completely surrounds the syncytial vitellarium and the cluster of ovocytes; the cytoplasmic bridges between the vitellarium and the immature ovocytes exist but are much narrower; a specialized junction (5–8 nm intercellular space) is established between the follicular layer and the whole area of the germo-vitellarium complex. Preliminary observations about the movements of organelles during ovogenesis were made at an ultrastructural level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310356
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  • 2
    Electronic Resource
    Electronic Resource
    Behavior and ultrastructure of sensory organs in rotifers (1983)
    Springer
    Hydrobiologia 104 (1983), S. 89-129 
    Details
    ISSN: 1573-5117
    Keywords: rotifers ; mechanoreceptors ; chemoreceptors ; photoreceptors ; feeding behavior ; mating behavior ; analysis of trajects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Résumé 1. Cette revue présente l'état actuel de nos connaissances sur les comportements des Rotifères. II s'agit soit de réponses immédiates, reflexes, a des stimulus, soit de séquences codées dont le déclenchement et la succession sont a base sensorielle: comportement alimentaire, reproducteur, ou qui suit la ponte chez N. copeus ... La perception de stimulations lumineuses ou chimiques contrôle les caractéristiques de la nage (taxies, ortho- et clinocinèses). Chaque comportement spécifique d'un Rotifère correspond à des différenciations morphologiques spécifiques des organes effecteurs (formations tégumentaires, glandulaires, cils et muscles), mais également a des sensibilités qui varient d'une espèce a l'autre, et ne sont pas toujours connues précisément. 2. Cette revue présente également l'état de nos connaissance sur les récepteurs sensoriels des Rotifères. Leur structure et leur organisation sont très variables d'une espéce a une autre, présentant des différenciations ciliaires ou membranaires très originales, parfois uniques dans le règne animal. Chaque récepteur sensoriel est constitué des terminaisons d'un à quelques neurones sensoriels. La localisation des organes sensoriels, et la spécialisation des structures sensorielles, permettent d'émettre des hypothèses quant a leur fonction dans la photo-, mécano-ou chimio-reception. 3. Au terme de ce double bilan, plusieurs questions demeurent: quels sont les récepteurs qui sont impliqués dans certaines sensibilités mises en evidence (vibro-réception par exemple, ou telle ou telle photo- ou chimio-réception)? Quelles sont les fonctions sensorielles précises de chaque récepteur décrit? Est-ce qu'à chaque structure sensorielle originale correspond une sensibilité originale? Par ailleurs, par leur faible taille, leur eutélie, leur paucicellularité (environ 1000 cellules dont 200 neurones), et leur isogénicité au sein de clones faciles à élever, les Rotiferes sont de bons modéles théoriques pour les neurobiologistes. Enfin, l'étude de ses sensibilités et de ses comportements est nécessaire pour comprendre l'écologie de chaque espèce, voire de chaque clone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00045957
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  • 3
    Electronic Resource
    Electronic Resource
    The skeletal muscles of rotifers and their innervation (1989)
    Springer
    Hydrobiologia 186-187 (1989), S. 255-278 
    Details
    ISSN: 1573-5117
    Keywords: muscles ; innervation ; behavior ; cytology ; ultrastructure ; rotifers ; smooth muscles ; striated muscles ; motor units ; phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The skeletal muscles of rotifers are monocellular or occasionally bicellular. They display great diversity of cytological features correlated to their functional differentiation. The cross-striated fibers of some retractors are fast contracting and relaxing, with A-band lengths of 0.7 µm to 1.6 µm, abundant sarcoplasmic reticulum and dyads. Other retractors and the circular muscles are tonic fibers (A band 〉 3 µm), stronger (large volume of myoplasm) or with greater endurance (superior volume of mitochondria/ myoplasm). All of these retractor muscles are coupled by gap junctions and are innervated at two symmetrical points; they constitute two motor units implicated in withdrawal behaviour. The muscles inserted on the ciliary roots of the cingulum control swimming. They are multi-innervated and each of them constitute one motor unit. They have characteristics of very fast fibers; the shortest A-band length is 0.5 µm in Asplanchna. All the skeletal muscles of bdelloids are smooth or obliquely striated as are some skeletal muscles of monogononts. These muscles are well suited for maximum shortening and are either phasic or tonic fibers. All rotifer skeletal muscles originate from ectoderm and contain thin and thick myofilaments whose diameters are identical to those of actin and myosin filaments in vertebrate fast muscles or in insect flight muscles. There are no paramyosinic features in the thick myofilaments. The insertion, innervation, coupling by gap junctions and other cytological differentiations of rotifer skeletal muscles are reviewed and their phylogeny discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048921
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  • 4
    Electronic Resource
    Electronic Resource
    Sensory receptors involved in the feeding behaviour of the rotifer Asplanchna brightwelli (1983)
    Springer
    Hydrobiologia 104 (1983), S. 203-212 
    Details
    ISSN: 1573-5117
    Keywords: rotifers ; sensory receptor ; feeding behaviour ; scanning electron microscopy ; transmission electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study of the anterior sensory receptors of male and female Asplanchna brightwelli by scanning electron microscopy reveals some important differences in the region surrounding the mouth. In the male, the ventrolateral sensory bristles, the pseudotrochus, the inner and the outer buccal tufts and the mastax receptors are absent. The oral receptors are reduced. Transmission electron microscopy of these receptors shows that they consist of ciliated sensory cells surrounded by epithelial supporting cells. The distal ends of the cilia of the mastax receptors are modified; the cilia of the other receptors differ only in their length and rootlet structure from the locomotor cilia of the cingulum. A consideration of the feeding behaviour of Asplanchna leads us to suppose that these sensory cilia function in mechanoreception and in chemoreception.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00045969
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  • 5
    Electronic Resource
    Electronic Resource
    Inward barium current and excitation-contraction coupling in frog twitch muscle fibres (1993)
    Springer
    Journal of muscle research and cell motility 14 (1993), S. 158-166 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The role of barium ions in excitation-contraction coupling was studied in single isolated frog semitendinosus fibres. Simultaneous recordings of membrane currents and contraction under voltage-clamp conditions in a sucrose-vaseline gap device show that barium ions have a reversible inhibiting effect on contraction. This inhibiting action was correlated to the entry of barium ions via the DHP-sensitive tubular calcium channel. Cytological observations and X-ray microanalysis performed on the fibres used in the electrophysiological experiments indicate that barium ions do not accumulate in the junctional sarcoplasmic reticulum; they can freely diffuse in the intermyofibrillar space and they accumulate in mitochondria. Calcium release experiments performed on isolated sarcoplasmic reticulum vesicles show that barium ions are not able to induce calcium release from calcium-loaded vesicles, they behave as calcium release inhibitors. These results are discussed in relation with the possible role of the slow Ca current in excitation-contraction coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115450
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  • 6
    Electronic Resource
    Electronic Resource
    Visualization of the subsarcolemmal cytoskeleton network of mouse skeletal muscle cells by en face views and application to immunoelectron localization of dystrophin (1995)
    Springer
    Journal of muscle research and cell motility 16 (1995), S. 553-566 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructural organization of the highly interconnected filamentous network underneath the sarcolemma as well as the role played by the muscle protein dystrophin within this cytoskeleton remain yet unclear. More accurate information has been obtained by using a method which provides three-dimensional en face views of large membrane areas applied to mouse cultured myotubes and isolated adult skeletal muscle fibres. Two levels have been distinguished in the cytoskeleton underlying the sarcolemma: the submembranous level, partly integrated into the membrane, and the cortical level, invading the proximal cytoplasmic space. Few differences have been found between the membrane cytoskeletons of myotubes issued from 14-day-old cultures and those of adult fibres. The comparison was done with cells where dystrophin is missing (mdx mouse muscle): surprisingly, the lack of dystrophin does not induce obvious or dramatic ultrastructural disorganization, either in the cortical cytoskeletal network or in the submembranous one. Immunogold labelling of either the central-rod or the C-terminal domain of dystrophin is not located among the cortical network. This study provides additional data on the spatial ordering of subsarcolemmal cytoskeletal elements: dystrophin does not appear as a filamentous structure entirely located among subsarcolemmal cytoskeleton but seems partly embedded in membranous material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00126439
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  • 7
    Electronic Resource
    Electronic Resource
    Correlations between ultrastructural features and contraction rates in Rotiferan muscle (1977)
    Springer
    Cell & tissue research 181 (1977), S. 81-90 
    Details
    ISSN: 1432-0878
    Keywords: Muscle ; Rotifers ; Myofilaments ; Supercontraction ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The Rotifer Trichocerca rattus has striated longitudinal retractor muscles. These muscles can be divided into two categories: 1. The central and ventral retractor muscles which, after fixation, are found in a supercontracted state: they probably contract very quickly. 2. The lateral retractor muscles which are in a relaxed state after fixation. However, if the animal is mechanically stimulated before fixation, these are also fixed in a contracted state: so, normally, these muscles probably contract more slowly than the first category. In the relaxed state, thin myofilaments of the lateral retractor muscles are folded at the I band level; this is a consequence of their compression provoked by the contraction of central and ventral retractor muscles. In muscles of the first type, the thick myofilaments are shorter (〈2 μ) than in the second type (2.5 μ).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222776
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  • 8
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    Correlations between ultrastructural features and contraction rates in Rotiferan muscle (1977)
    Springer
    Details
    Publication Date: 1977-06-01
    Print ISSN: 0302-766X
    Electronic ISSN: 1432-0878
    Topics: Biology , Medicine
    Published by Springer
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  • 9
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    The skeletal muscles of rotifers and their innervation (1989)
    Springer
    Details
    Publication Date: 1989-12-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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  • 10
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    Sensory receptors involved in the feeding behaviour of the rotifer Asplanchna brightwelli (1983)
    Springer
    Details
    Publication Date: 1983-08-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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