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  • Ultrastructure  (5)
  • Springer  (5)
  • Oxford University Press
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  • Springer  (5)
  • Oxford University Press
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  • 1
    Electronic Resource
    Electronic Resource
    Response of host embryonic chicks to grafts of additional adrenal glands (1970)
    Springer
    Cell & tissue research 108 (1970), S. 1-16 
    Details
    ISSN: 1432-0878
    Keywords: Adrenal ; Avian ; Ultrastructure ; Graft ; Compensatory hypertrophy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the developing adrenal gland of the chick has been studied over the embryonic period 10 to 18 days. Cortical cells occur in double-rowed strands, are loosely attached in early development but more firmly attached later in development. Hypertrophy of mitochondria, endoplasmic reticulum, golgi body, lipid and vacuoles increases with increasing age. Two cell types (designated “Dark” and “Light”) were present at 17 days of incubation. Their significance is discussed. Medullary cells occur as single cells at 10 days but more usually in groups by 18 days. Catecholamine-containing granules are a prominent feature of the medullary cells, at all ages. Two cell types could be distinguished in the medulla at 17 days of incubation. These may represent adrenalin and noradrenalin-containing cells. Changes in the ultrastructure of host adrenal glands after exposure to an 18 day adrenal gland, grafted onto the host chorio-allantoic membrane at 8 days, were studied. The chief response within the cortex of the host involved retardation of organelle hypertrophy, so that 17 day hosts resembled 14 day controls. More light cells were seen in the host than in the control cells. The medullary tissue of the host was also retarded in development and the release of catecholamine-containing granules inhibited. The significance of these observations in relation to compensatory hypertrophy within the host is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335939
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  • 2
    Electronic Resource
    Electronic Resource
    The larval eye of the aeolid nudibranch Trinchesia aurantia (Alder and Hancock) (1970)
    Springer
    Cell & tissue research 109 (1970), S. 55-63 
    Details
    ISSN: 1432-0878
    Keywords: Sense organs ; Eyes ; Nudibranchs ; Trinchesia aurantia ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The larval eye of the aeolid nudibranch Trinchesia aurantia has been investigated at three different stages; in all, the eyes remain closely attached to, and in cellular contact with, the central ganglia. The larval eye is a simplified version of the adult eye in that, the eye and the constituent cells, nuclei, lens, microvilli and pigment granules are all smaller, and the interdigitation between the retinal cells is not developed. The absence of the small cells of the cornea and of the spherical vesicles in the cytoplasm of the sensory cells, is further evidence of the incomplete formation of the eye. The possible origin of the eye of Trinchesia is discussed and compared with that of other gastropods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00364931
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  • 3
    Electronic Resource
    Electronic Resource
    A light and electron microscope study of some opisthobranch eyes (1970)
    Springer
    Cell & tissue research 106 (1970), S. 79-98 
    Details
    ISSN: 1432-0878
    Keywords: Sense organs ; Eyes ; Opisthobranchs ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The retina of nudibranch eyes contains two types of large cells; pigment cells which comprise about two-thirds of the total, with unpigmented sensory cells making up the remainder. Both pigment and receptor cells carry microvilli on their distal borders, but no traces of cilia were observed among them. The cornea of the eyes of aeolid and dendronotid nudibranchs is composed of a single layer of small cells, unlike the dorids where the cornea is made up of one of more large cells. The latter contain nuclei comparable in size with those of the pigment cells in the retina, but are themselves unpigmented. The elliptical eyes ofAplysia contain three types of retinal cell; the pigment cells and two kinds of receptor cells. The “ciliary” receptor cells bear equal numbers of cilia (9+2) and microvilli, while the “microvillous” receptor cells carry long tufts of microvilli with only an occasional cilium among them. The proximal cytoplasm of the receptor cells inAplysia and the nudibranchs contains large quantities of the small spherical vesicles (averaging 660 Å in diameter) which appear to be characteristic of gastropod eyes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01027719
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructure of the reactivated corpus luteum after embryonic diapause in the marsupial, Macropus rufogriseus banksianus (1983)
    Springer
    Cell & tissue research 228 (1983), S. 61-74 
    Details
    ISSN: 1432-0878
    Keywords: Marsupial ; Ultrastructure ; Corpus luteum ; Granules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary During embryonic diapause in the red-necked wallaby, M. r. banksianus, both the corpus luteum and uterine blastocyst remain dormant, and are reactivated following removal of the suckling pouch young (RPY). The morphology of dormant and reactivated corpora lutea has been studied throughout the 26.5 days of delayed gestation. Corpora lutea at 0, 2 1/2, 4, 9, 14, 21 and 25 days after RPY were fixed by perfusion. From day 4 to day 14 after RPY there was a progressive increase in the amount of smooth endoplasmic reticulum and the numbers of mitochondria. However there was a decrease in mitochondrial size from 1–2 μm in diameter (0 days after RPY) to 0.5–1 μm (14 days after RPY). Densely-staining granules (approximately 0.2 μm in diameter) were first observed in the luteal cells at 4 days after RPY. The maximum density of granules was observed at 21 days after RPY. Shortly before birth (25 days after RPY) the number of secretory granules had significantly decreased and the features of cellular regression were evident. As with the eutherian mammals, the wallaby luteal cells have all the structural organelles associated with steroid hormone production. The numbers of densely-staining granules are greatest at 21 days after RPY and may reflect the luteal progesterone content since similar granules in the sheep and cow have been shown to be associated with elevated levels of progesterone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206265
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and regeneration of the eyes of strombid gastropods (1976)
    Springer
    Cell & tissue research 171 (1976), S. 259-271 
    Details
    ISSN: 1432-0878
    Keywords: Eyes ; Strombus ; Regeneration ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The tips of the eyestalks of three species of strombid gastropods were amputated and the structure of the fully developed eye investigated. The retina contains at least two types of cell: sensory cells bearing long tufts of microvilli with a central cytoplasmic core, and pigment cells with short microvilli. New eyes became visible at the tips of the eyestalk stump 5–16 days after amputation. When the regenerated eyes first appear, they consist of hollow balls of cells with a pigment lined cavity; two types of retinal cells are already distinguishable but their microvilli and cilia are small and sparse. The microvillous tufts and sensory cell contents develop quickly and about 14 days after their first appearance, the eye is a fully formed but miniature organ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219410
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