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  • Electron microscopy  (6)
  • Springer  (6)
  • American Institute of Physics (AIP)
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  • Springer  (6)
  • American Institute of Physics (AIP)
  • Elsevier  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Endothelial cell connecting filaments anchor endothelial cells to the subjacent elastic lamina in the developing aortic intima of the mouse (1993)
    Springer
    Cell & tissue research 272 (1993), S. 211-219 
    Details
    ISSN: 1432-0878
    Keywords: Aorta ; Endothelium ; Anchoring filaments ; Microfibrils ; Elastin ; Electron microscopy ; Mouse (C57/BL)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The ultrastructural association of endothelial cells with the subjacent elastic lamina was investigated in the developing mouse aorta by electron microscopy. In the 5-day postnatal aorta, extensive filament bundles extend along the subendothelial matrix connecting the endothelial cells to the underlying elastic lamina. The connecting filaments form lateral associations with the abluminal surface of the endothelial cells in regions of membrane occupied by membrane-associated dense plaques. On the intracellular face of each plaque, the termini of stress fibers penetrate and anchor to the cell membrane in alignment with the extracellular connecting filaments. Both the stress fibers and the connecting filaments are oriented parallel to the longitudinal axis of the vessel. High magnification electron micrographs of individual endothelial cell connecting filaments reveal features similar to those of elastin-associated microfibrils. Each connecting filament consists of a 9–10 nm linear core with an electron-lucent center and peripheral spike-like projections. From the filaments, small thread-like extensions span laterally, linking the filaments into a loose bundle and anchoring them to the endothelial cell membrane and the surface of the elastic lamina. The filaments also appear heavily coated with electron-dense material; often with some degree of periodicity along the filament length. During development, the number of endothelial cell connecting filaments decreases as the elastic lamina expands and the subendothelial matrix is reduced. In the aortic intima of mature mice, the elastic lamina is closely apposed to the abluminal surface of the endothelial cell and no connecting filaments are seen. These observations suggest that endothelial cell connecting filaments are developmental features of the aortic intima which, together with the intracellular stress fibers, aid to maintain the structural integrity of the endothelial cell layer during development by providing the cells with protection from intraluminal shear forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302726
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural evidence for the presence of nerve cells in the gastrodermis of Hydra (1972)
    Springer
    Cell & tissue research 123 (1972), S. 1-17 
    Details
    ISSN: 1432-0878
    Keywords: Gastrodermal nerves ; Hydra pseudoligactis ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Two types of nerve cells, namely, neurosensory and neurosecretory cells have been identified and described in the gastrodermis of Hydra pseudoligactis. The morphological criteria used for the identification of gastrodermal nerves are based on those presented previously for epidermal nerves. The third type of nerve cell in the epidermis, ganglionic cells, was not observed in these studies. The distribution, function and origin of gastrodermal nerve cells are discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337670
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  • 3
    Electronic Resource
    Electronic Resource
    The role of the nervous system in regeneration, growth and cell differentiation in Hydra (1974)
    Springer
    Cell & tissue research 150 (1974), S. 231-247 
    Details
    ISSN: 1432-0878
    Keywords: Regeneration ; Nerve cells ; Neurosecretion ; Hydra ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Major ultrastructural changes in neurons were studied during sequential periods of hypostomal regeneration in Hydra. Some neurons remain unaffected except that at certain periods following amputation, they become more active in neurosecretory production. Other neurons in various stages of differentiation were also observed. Most emphasis was placed on degenerating neurons showing a loss of organelles and destruction of the perikarya. Certain large, membrane-bounded structures (up to 1.7 μ in diameter) suggested tentatively to be of a lysosomal-like nature, may be partly responsible for the degenerative process. The neurites of these cells first assume a beaded appearance and/or contain bulbous endings. The eventual isolated fragments of neurites contain typical membrane-bounded neurosecretory droplets (850/1700 Å in diameter) which disintegrate forming particulate materials (350 Å in diameter). Following complete disruption of the neurites, some of the granules accumulate in the extracellular spaces before they are disintegrated. From the data presented in this and the preceding paper, it is suggested that these particles, derived from neurosecretory droplets, may be responsible for the stimulation of: 1) interstitial cell differentiation into neurons, 2) the increased activity in neurosecretory production in normal cells, 3) the conspicuous increase in neurite length and consequently the exaggerated degree of anastomosis, and 4) the possible capacity of neurons to regenerate neurites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222172
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  • 4
    Electronic Resource
    Electronic Resource
    The general occurrence of intramitochondrial crystals in Hydra cells (1976)
    Springer
    Cell & tissue research 171 (1976), S. 499-511 
    Details
    ISSN: 1432-0878
    Keywords: Mitochondria ; Hydra ; Crystals ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Intramitochondrial crystals are found in normal Hydra as well as in animals undergoing various conditions (budding, regenerating, eserinetreated, and sexual). They appear in all regions of the animal, but seem to be more prevalent at or near the extremities: hypostome, tentacles and basal disk. They are found in all of the seven basic cell types: interstitial, cnidocyte, nerve, epithelio-muscular, gland, mucous and digestive cells. The chemical nature of the intramitochondrial crystals is unknown and their significance remains speculative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220241
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  • 5
    Electronic Resource
    Electronic Resource
    Histological and ultrastructural studies of the basal disk of Hydra (1975)
    Springer
    Cell & tissue research 162 (1975), S. 107-118 
    Details
    ISSN: 1432-0878
    Keywords: Basal disk ; Gastrodermis ; Mesoglea ; Hydra ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The gastrodermis and mesoglea of the basal disk of Hydra were investigated to conclude a three-part series of papers. The gastrodermis is composed of digestive cells (most predominant cell type), mucous and nerve cells (both immature and fully differentiated). The principal function of the digestive cells appears to be storage of protein, lipid and glycogen reserves which are utilized by neighboring cells. Mucous cells apparently use some of the reserves to synthesize their secretions which lubricate cells and prevent cell damage during egestion of waste through the aboral pore. The function of the gastrodermal nerve cells is uncertain. The mesoglea of the basal disk, contains the same structural components as seen in other regions of the polyp. It is reasonable to assume that it maintains the same function of cell adhesion and migration. As the mesoglea converges on the aboral pore, it loses its structural integrity and cells are sloughed off the column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223266
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  • 6
    Electronic Resource
    Electronic Resource
    Paddle cilia (discocilia) in chemosensitive structures of the gastropod mollusk Pleurobranchaea californica (1982)
    Springer
    Cell & tissue research 222 (1982), S. 25-40 
    Details
    ISSN: 1432-0878
    Keywords: Paddle cilia ; Discocilia ; Pleurobranchaea ; Chemoreceptors ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Scanning electron microscopy of various regions of the body of the marine gastropod Pleurobranchaea californica (McFarland) has revealed a characteristic cell type that bears cilia with dilated discoid-shaped tips. The tips of the cilia consist of an expansion of the ciliary membrane around a looped distal extension of the axoneme. These kinocilia have been observed in numerous other marine invertebrates and are generally referred to as paddle cilia (Tamarin et al. 1974) or discocilia (Heimler 1978). Although many functions have been proposed for paddle cilia, little empirical evidence supports any of the proposals. In Pleurobranchaea we have found that the distribution of this ciliated cell type corresponds exactly to areas of the body known from behavioral studies (Lee et al. 1974; Davis and Matera 1981) to mediate chemoreception. Transmission electron microscopy of the epithelium lining the rhinophores and tentacles of Pleurobranchaea revealed details of the ultrastructure of these ciliated cells and showed that they are primary receptors. These ciliated receptors lie in a yellow-brown pseudostratified columnar epithelium that superficially resembles the olfactory mucosa of vertebrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218286
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