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  • Ultrastructure  (3)
  • Springer  (3)
  • 1970-1974  (3)
  • 1950-1954
  • 1920-1924
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  • Springer  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Sense organs ; Eyes ; Nudibranchs ; Trinchesia aurantia ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00364931
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A light and electron microscope study of some opisthobranch eyes (1970)
    Springer
    Cell & tissue research 106 (1970), S. 79-98 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Sense organs ; Eyes ; Opisthobranchs ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01027719
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Adrenal ; Avian ; Ultrastructure ; Graft ; Compensatory hypertrophy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00335939
    Standort Signatur Erwartet Verfügbarkeit
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